return data.ret;
}
-static inline struct perf_cpu_context *
-__get_cpu_context(struct perf_event_context *ctx)
-{
- return this_cpu_ptr(ctx->pmu->pmu_cpu_context);
-}
-
static void perf_ctx_lock(struct perf_cpu_context *cpuctx,
struct perf_event_context *ctx)
{
return READ_ONCE(event->owner) == TASK_TOMBSTONE;
}
+static DEFINE_PER_CPU(struct perf_cpu_context, perf_cpu_context);
+
+struct perf_event_context *perf_cpu_task_ctx(void)
+{
+ lockdep_assert_irqs_disabled();
+ return this_cpu_ptr(&perf_cpu_context)->task_ctx;
+}
+
/*
* On task ctx scheduling...
*
struct event_function_struct *efs = info;
struct perf_event *event = efs->event;
struct perf_event_context *ctx = event->ctx;
- struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
struct perf_event_context *task_ctx = cpuctx->task_ctx;
int ret = 0;
static void event_function_local(struct perf_event *event, event_f func, void *data)
{
struct perf_event_context *ctx = event->ctx;
- struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
struct task_struct *task = READ_ONCE(ctx->task);
struct perf_event_context *task_ctx = NULL;
static atomic_t perf_sched_count;
static DEFINE_PER_CPU(atomic_t, perf_cgroup_events);
-static DEFINE_PER_CPU(int, perf_sched_cb_usages);
static DEFINE_PER_CPU(struct pmu_event_list, pmu_sb_events);
static atomic_t nr_mmap_events __read_mostly;
WRITE_ONCE(perf_sample_allowed_ns, tmp);
}
-static bool perf_rotate_context(struct perf_cpu_context *cpuctx);
+static bool perf_rotate_context(struct perf_cpu_pmu_context *cpc);
int perf_proc_update_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
static atomic64_t perf_event_id;
-static void cpu_ctx_sched_out(struct perf_cpu_context *cpuctx,
- enum event_type_t event_type);
-
-static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx,
- enum event_type_t event_type);
-
static void update_context_time(struct perf_event_context *ctx);
static u64 perf_event_time(struct perf_event *event);
___p; \
})
+static void perf_ctx_disable(struct perf_event_context *ctx)
+{
+ struct perf_event_pmu_context *pmu_ctx;
+
+ list_for_each_entry(pmu_ctx, &ctx->pmu_ctx_list, pmu_ctx_entry)
+ perf_pmu_disable(pmu_ctx->pmu);
+}
+
+static void perf_ctx_enable(struct perf_event_context *ctx)
+{
+ struct perf_event_pmu_context *pmu_ctx;
+
+ list_for_each_entry(pmu_ctx, &ctx->pmu_ctx_list, pmu_ctx_entry)
+ perf_pmu_enable(pmu_ctx->pmu);
+}
+
+static void ctx_sched_out(struct perf_event_context *ctx, enum event_type_t event_type);
+static void ctx_sched_in(struct perf_event_context *ctx, enum event_type_t event_type);
+
#ifdef CONFIG_CGROUP_PERF
static inline bool
perf_cgroup_match(struct perf_event *event)
{
- struct perf_event_context *ctx = event->ctx;
- struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
/* @event doesn't care about cgroup */
if (!event->cgrp)
}
}
-static DEFINE_PER_CPU(struct list_head, cgrp_cpuctx_list);
-
/*
* reschedule events based on the cgroup constraint of task.
*/
static void perf_cgroup_switch(struct task_struct *task)
{
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
struct perf_cgroup *cgrp;
- struct perf_cpu_context *cpuctx, *tmp;
- struct list_head *list;
- unsigned long flags;
-
- /*
- * Disable interrupts and preemption to avoid this CPU's
- * cgrp_cpuctx_entry to change under us.
- */
- local_irq_save(flags);
cgrp = perf_cgroup_from_task(task, NULL);
- list = this_cpu_ptr(&cgrp_cpuctx_list);
- list_for_each_entry_safe(cpuctx, tmp, list, cgrp_cpuctx_entry) {
- WARN_ON_ONCE(cpuctx->ctx.nr_cgroups == 0);
- if (READ_ONCE(cpuctx->cgrp) == cgrp)
- continue;
-
- perf_ctx_lock(cpuctx, cpuctx->task_ctx);
- perf_pmu_disable(cpuctx->ctx.pmu);
+ WARN_ON_ONCE(cpuctx->ctx.nr_cgroups == 0);
+ if (READ_ONCE(cpuctx->cgrp) == cgrp)
+ return;
- cpu_ctx_sched_out(cpuctx, EVENT_ALL);
- /*
- * must not be done before ctxswout due
- * to update_cgrp_time_from_cpuctx() in
- * ctx_sched_out()
- */
- cpuctx->cgrp = cgrp;
- /*
- * set cgrp before ctxsw in to allow
- * perf_cgroup_set_timestamp() in ctx_sched_in()
- * to not have to pass task around
- */
- cpu_ctx_sched_in(cpuctx, EVENT_ALL);
+ perf_ctx_lock(cpuctx, cpuctx->task_ctx);
+ perf_ctx_disable(&cpuctx->ctx);
- perf_pmu_enable(cpuctx->ctx.pmu);
- perf_ctx_unlock(cpuctx, cpuctx->task_ctx);
- }
+ ctx_sched_out(&cpuctx->ctx, EVENT_ALL);
+ /*
+ * must not be done before ctxswout due
+ * to update_cgrp_time_from_cpuctx() in
+ * ctx_sched_out()
+ */
+ cpuctx->cgrp = cgrp;
+ /*
+ * set cgrp before ctxsw in to allow
+ * perf_cgroup_set_timestamp() in ctx_sched_in()
+ * to not have to pass task around
+ */
+ ctx_sched_in(&cpuctx->ctx, EVENT_ALL);
- local_irq_restore(flags);
+ perf_ctx_enable(&cpuctx->ctx);
+ perf_ctx_unlock(cpuctx, cpuctx->task_ctx);
}
static int perf_cgroup_ensure_storage(struct perf_event *event,
heap_size++;
for_each_possible_cpu(cpu) {
- cpuctx = per_cpu_ptr(event->pmu->pmu_cpu_context, cpu);
+ cpuctx = per_cpu_ptr(&perf_cpu_context, cpu);
if (heap_size <= cpuctx->heap_size)
continue;
return;
cpuctx->cgrp = perf_cgroup_from_task(current, ctx);
- list_add(&cpuctx->cgrp_cpuctx_entry,
- per_cpu_ptr(&cgrp_cpuctx_list, event->cpu));
}
static inline void
return;
cpuctx->cgrp = NULL;
- list_del(&cpuctx->cgrp_cpuctx_entry);
}
#else /* !CONFIG_CGROUP_PERF */
*/
static enum hrtimer_restart perf_mux_hrtimer_handler(struct hrtimer *hr)
{
- struct perf_cpu_context *cpuctx;
+ struct perf_cpu_pmu_context *cpc;
bool rotations;
lockdep_assert_irqs_disabled();
- cpuctx = container_of(hr, struct perf_cpu_context, hrtimer);
- rotations = perf_rotate_context(cpuctx);
+ cpc = container_of(hr, struct perf_cpu_pmu_context, hrtimer);
+ rotations = perf_rotate_context(cpc);
- raw_spin_lock(&cpuctx->hrtimer_lock);
+ raw_spin_lock(&cpc->hrtimer_lock);
if (rotations)
- hrtimer_forward_now(hr, cpuctx->hrtimer_interval);
+ hrtimer_forward_now(hr, cpc->hrtimer_interval);
else
- cpuctx->hrtimer_active = 0;
- raw_spin_unlock(&cpuctx->hrtimer_lock);
+ cpc->hrtimer_active = 0;
+ raw_spin_unlock(&cpc->hrtimer_lock);
return rotations ? HRTIMER_RESTART : HRTIMER_NORESTART;
}
-static void __perf_mux_hrtimer_init(struct perf_cpu_context *cpuctx, int cpu)
+static void __perf_mux_hrtimer_init(struct perf_cpu_pmu_context *cpc, int cpu)
{
- struct hrtimer *timer = &cpuctx->hrtimer;
- struct pmu *pmu = cpuctx->ctx.pmu;
+ struct hrtimer *timer = &cpc->hrtimer;
+ struct pmu *pmu = cpc->epc.pmu;
u64 interval;
- /* no multiplexing needed for SW PMU */
- if (pmu->task_ctx_nr == perf_sw_context)
- return;
-
/*
* check default is sane, if not set then force to
* default interval (1/tick)
if (interval < 1)
interval = pmu->hrtimer_interval_ms = PERF_CPU_HRTIMER;
- cpuctx->hrtimer_interval = ns_to_ktime(NSEC_PER_MSEC * interval);
+ cpc->hrtimer_interval = ns_to_ktime(NSEC_PER_MSEC * interval);
- raw_spin_lock_init(&cpuctx->hrtimer_lock);
+ raw_spin_lock_init(&cpc->hrtimer_lock);
hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED_HARD);
timer->function = perf_mux_hrtimer_handler;
}
-static int perf_mux_hrtimer_restart(struct perf_cpu_context *cpuctx)
+static int perf_mux_hrtimer_restart(struct perf_cpu_pmu_context *cpc)
{
- struct hrtimer *timer = &cpuctx->hrtimer;
- struct pmu *pmu = cpuctx->ctx.pmu;
+ struct hrtimer *timer = &cpc->hrtimer;
unsigned long flags;
- /* not for SW PMU */
- if (pmu->task_ctx_nr == perf_sw_context)
- return 0;
-
- raw_spin_lock_irqsave(&cpuctx->hrtimer_lock, flags);
- if (!cpuctx->hrtimer_active) {
- cpuctx->hrtimer_active = 1;
- hrtimer_forward_now(timer, cpuctx->hrtimer_interval);
+ raw_spin_lock_irqsave(&cpc->hrtimer_lock, flags);
+ if (!cpc->hrtimer_active) {
+ cpc->hrtimer_active = 1;
+ hrtimer_forward_now(timer, cpc->hrtimer_interval);
hrtimer_start_expires(timer, HRTIMER_MODE_ABS_PINNED_HARD);
}
- raw_spin_unlock_irqrestore(&cpuctx->hrtimer_lock, flags);
+ raw_spin_unlock_irqrestore(&cpc->hrtimer_lock, flags);
return 0;
}
pmu->pmu_enable(pmu);
}
-static DEFINE_PER_CPU(struct list_head, active_ctx_list);
-
-/*
- * perf_event_ctx_activate(), perf_event_ctx_deactivate(), and
- * perf_event_task_tick() are fully serialized because they're strictly cpu
- * affine and perf_event_ctx{activate,deactivate} are called with IRQs
- * disabled, while perf_event_task_tick is called from IRQ context.
- */
-static void perf_event_ctx_activate(struct perf_event_context *ctx)
-{
- struct list_head *head = this_cpu_ptr(&active_ctx_list);
-
- lockdep_assert_irqs_disabled();
-
- WARN_ON(!list_empty(&ctx->active_ctx_list));
-
- list_add(&ctx->active_ctx_list, head);
-}
-
-static void perf_event_ctx_deactivate(struct perf_event_context *ctx)
+static void perf_assert_pmu_disabled(struct pmu *pmu)
{
- lockdep_assert_irqs_disabled();
-
- WARN_ON(list_empty(&ctx->active_ctx_list));
-
- list_del_init(&ctx->active_ctx_list);
+ WARN_ON_ONCE(*this_cpu_ptr(pmu->pmu_disable_count) == 0);
}
static void get_ctx(struct perf_event_context *ctx)
struct perf_event_context *ctx;
ctx = container_of(head, struct perf_event_context, rcu_head);
- free_task_ctx_data(ctx->pmu, ctx->task_ctx_data);
kfree(ctx);
}
* the context could get moved to another task.
*/
static struct perf_event_context *
-perf_lock_task_context(struct task_struct *task, int ctxn, unsigned long *flags)
+perf_lock_task_context(struct task_struct *task, unsigned long *flags)
{
struct perf_event_context *ctx;
*/
local_irq_save(*flags);
rcu_read_lock();
- ctx = rcu_dereference(task->perf_event_ctxp[ctxn]);
+ ctx = rcu_dereference(task->perf_event_ctxp);
if (ctx) {
/*
* If this context is a clone of another, it might
* can't get swapped on us any more.
*/
raw_spin_lock(&ctx->lock);
- if (ctx != rcu_dereference(task->perf_event_ctxp[ctxn])) {
+ if (ctx != rcu_dereference(task->perf_event_ctxp)) {
raw_spin_unlock(&ctx->lock);
rcu_read_unlock();
local_irq_restore(*flags);
* reference count so that the context can't get freed.
*/
static struct perf_event_context *
-perf_pin_task_context(struct task_struct *task, int ctxn)
+perf_pin_task_context(struct task_struct *task)
{
struct perf_event_context *ctx;
unsigned long flags;
- ctx = perf_lock_task_context(task, ctxn, &flags);
+ ctx = perf_lock_task_context(task, &flags);
if (ctx) {
++ctx->pin_count;
raw_spin_unlock_irqrestore(&ctx->lock, flags);
* which provides ordering when rotating groups for the same CPU.
*/
static __always_inline int
-perf_event_groups_cmp(const int left_cpu, const struct cgroup *left_cgroup,
- const u64 left_group_index, const struct perf_event *right)
+perf_event_groups_cmp(const int left_cpu, const struct pmu *left_pmu,
+ const struct cgroup *left_cgroup, const u64 left_group_index,
+ const struct perf_event *right)
{
if (left_cpu < right->cpu)
return -1;
if (left_cpu > right->cpu)
return 1;
+ if (left_pmu) {
+ if (left_pmu < right->pmu_ctx->pmu)
+ return -1;
+ if (left_pmu > right->pmu_ctx->pmu)
+ return 1;
+ }
+
#ifdef CONFIG_CGROUP_PERF
{
const struct cgroup *right_cgroup = event_cgroup(right);
static inline bool __group_less(struct rb_node *a, const struct rb_node *b)
{
struct perf_event *e = __node_2_pe(a);
- return perf_event_groups_cmp(e->cpu, event_cgroup(e), e->group_index,
- __node_2_pe(b)) < 0;
+ return perf_event_groups_cmp(e->cpu, e->pmu_ctx->pmu, event_cgroup(e),
+ e->group_index, __node_2_pe(b)) < 0;
}
struct __group_key {
int cpu;
+ struct pmu *pmu;
struct cgroup *cgroup;
};
const struct __group_key *a = key;
const struct perf_event *b = __node_2_pe(node);
- /* partial/subtree match: @cpu, @cgroup; ignore: @group_index */
- return perf_event_groups_cmp(a->cpu, a->cgroup, b->group_index, b);
+ /* partial/subtree match: @cpu, @pmu, @cgroup; ignore: @group_index */
+ return perf_event_groups_cmp(a->cpu, a->pmu, a->cgroup, b->group_index, b);
+}
+
+static inline int
+__group_cmp_ignore_cgroup(const void *key, const struct rb_node *node)
+{
+ const struct __group_key *a = key;
+ const struct perf_event *b = __node_2_pe(node);
+
+ /* partial/subtree match: @cpu, @pmu, ignore: @cgroup, @group_index */
+ return perf_event_groups_cmp(a->cpu, a->pmu, event_cgroup(b),
+ b->group_index, b);
}
/*
- * Insert @event into @groups' tree; using {@event->cpu, ++@groups->index} for
- * key (see perf_event_groups_less). This places it last inside the CPU
- * subtree.
+ * Insert @event into @groups' tree; using
+ * {@event->cpu, @event->pmu_ctx->pmu, event_cgroup(@event), ++@groups->index}
+ * as key. This places it last inside the {cpu,pmu,cgroup} subtree.
*/
static void
perf_event_groups_insert(struct perf_event_groups *groups,
}
/*
- * Get the leftmost event in the cpu/cgroup subtree.
+ * Get the leftmost event in the {cpu,pmu,cgroup} subtree.
*/
static struct perf_event *
perf_event_groups_first(struct perf_event_groups *groups, int cpu,
- struct cgroup *cgrp)
+ struct pmu *pmu, struct cgroup *cgrp)
{
struct __group_key key = {
.cpu = cpu,
+ .pmu = pmu,
.cgroup = cgrp,
};
struct rb_node *node;
return NULL;
}
-/*
- * Like rb_entry_next_safe() for the @cpu subtree.
- */
static struct perf_event *
-perf_event_groups_next(struct perf_event *event)
+perf_event_groups_next(struct perf_event *event, struct pmu *pmu)
{
struct __group_key key = {
.cpu = event->cpu,
+ .pmu = pmu,
.cgroup = event_cgroup(event),
};
struct rb_node *next;
return NULL;
}
+#define perf_event_groups_for_cpu_pmu(event, groups, cpu, pmu) \
+ for (event = perf_event_groups_first(groups, cpu, pmu, NULL); \
+ event; event = perf_event_groups_next(event, pmu))
+
/*
* Iterate through the whole groups tree.
*/
perf_cgroup_event_enable(event, ctx);
ctx->generation++;
+ event->pmu_ctx->nr_events++;
}
/*
lockdep_assert_held(&event->ctx->lock);
/*
- * We can have double attach due to group movement in perf_event_open.
+ * We can have double attach due to group movement (move_group) in
+ * perf_event_open().
*/
if (event->attach_state & PERF_ATTACH_GROUP)
return;
}
ctx->generation++;
+ event->pmu_ctx->nr_events--;
}
static int
static void put_event(struct perf_event *event);
static void event_sched_out(struct perf_event *event,
- struct perf_cpu_context *cpuctx,
struct perf_event_context *ctx);
static void perf_put_aux_event(struct perf_event *event)
{
struct perf_event_context *ctx = event->ctx;
- struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
struct perf_event *iter;
/*
* state so that we don't try to schedule it again. Note
* that perf_event_enable() will clear the ERROR status.
*/
- event_sched_out(iter, cpuctx, ctx);
+ event_sched_out(iter, ctx);
perf_event_set_state(event, PERF_EVENT_STATE_ERROR);
}
}
static inline struct list_head *get_event_list(struct perf_event *event)
{
- struct perf_event_context *ctx = event->ctx;
- return event->attr.pinned ? &ctx->pinned_active : &ctx->flexible_active;
+ return event->attr.pinned ? &event->pmu_ctx->pinned_active :
+ &event->pmu_ctx->flexible_active;
}
/*
*/
static inline void perf_remove_sibling_event(struct perf_event *event)
{
- struct perf_event_context *ctx = event->ctx;
- struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
-
- event_sched_out(event, cpuctx, ctx);
+ event_sched_out(event, event->ctx);
perf_event_set_state(event, PERF_EVENT_STATE_ERROR);
}
return event->state == PERF_EVENT_STATE_DEAD;
}
-static inline int __pmu_filter_match(struct perf_event *event)
-{
- struct pmu *pmu = event->pmu;
- return pmu->filter_match ? pmu->filter_match(event) : 1;
-}
-
-/*
- * Check whether we should attempt to schedule an event group based on
- * PMU-specific filtering. An event group can consist of HW and SW events,
- * potentially with a SW leader, so we must check all the filters, to
- * determine whether a group is schedulable:
- */
-static inline int pmu_filter_match(struct perf_event *event)
-{
- struct perf_event *sibling;
- unsigned long flags;
- int ret = 1;
-
- if (!__pmu_filter_match(event))
- return 0;
-
- local_irq_save(flags);
- for_each_sibling_event(sibling, event) {
- if (!__pmu_filter_match(sibling)) {
- ret = 0;
- break;
- }
- }
- local_irq_restore(flags);
-
- return ret;
-}
-
static inline int
event_filter_match(struct perf_event *event)
{
return (event->cpu == -1 || event->cpu == smp_processor_id()) &&
- perf_cgroup_match(event) && pmu_filter_match(event);
+ perf_cgroup_match(event);
}
static void
-event_sched_out(struct perf_event *event,
- struct perf_cpu_context *cpuctx,
- struct perf_event_context *ctx)
+event_sched_out(struct perf_event *event, struct perf_event_context *ctx)
{
+ struct perf_event_pmu_context *epc = event->pmu_ctx;
+ struct perf_cpu_pmu_context *cpc = this_cpu_ptr(epc->pmu->cpu_pmu_context);
enum perf_event_state state = PERF_EVENT_STATE_INACTIVE;
+ // XXX cpc serialization, probably per-cpu IRQ disabled
+
WARN_ON_ONCE(event->ctx != ctx);
lockdep_assert_held(&ctx->lock);
perf_event_set_state(event, state);
if (!is_software_event(event))
- cpuctx->active_oncpu--;
- if (!--ctx->nr_active)
- perf_event_ctx_deactivate(ctx);
+ cpc->active_oncpu--;
if (event->attr.freq && event->attr.sample_freq)
ctx->nr_freq--;
- if (event->attr.exclusive || !cpuctx->active_oncpu)
- cpuctx->exclusive = 0;
+ if (event->attr.exclusive || !cpc->active_oncpu)
+ cpc->exclusive = 0;
perf_pmu_enable(event->pmu);
}
static void
-group_sched_out(struct perf_event *group_event,
- struct perf_cpu_context *cpuctx,
- struct perf_event_context *ctx)
+group_sched_out(struct perf_event *group_event, struct perf_event_context *ctx)
{
struct perf_event *event;
if (group_event->state != PERF_EVENT_STATE_ACTIVE)
return;
- perf_pmu_disable(ctx->pmu);
+ perf_assert_pmu_disabled(group_event->pmu_ctx->pmu);
- event_sched_out(group_event, cpuctx, ctx);
+ event_sched_out(group_event, ctx);
/*
* Schedule out siblings (if any):
*/
for_each_sibling_event(event, group_event)
- event_sched_out(event, cpuctx, ctx);
-
- perf_pmu_enable(ctx->pmu);
+ event_sched_out(event, ctx);
}
#define DETACH_GROUP 0x01UL
struct perf_event_context *ctx,
void *info)
{
+ struct perf_event_pmu_context *pmu_ctx = event->pmu_ctx;
unsigned long flags = (unsigned long)info;
if (ctx->is_active & EVENT_TIME) {
update_cgrp_time_from_cpuctx(cpuctx, false);
}
- event_sched_out(event, cpuctx, ctx);
+ event_sched_out(event, ctx);
if (flags & DETACH_GROUP)
perf_group_detach(event);
if (flags & DETACH_CHILD)
perf_child_detach(event);
list_del_event(event, ctx);
+ if (!pmu_ctx->nr_events) {
+ pmu_ctx->rotate_necessary = 0;
+
+ if (ctx->task && ctx->is_active) {
+ struct perf_cpu_pmu_context *cpc;
+
+ cpc = this_cpu_ptr(pmu_ctx->pmu->cpu_pmu_context);
+ WARN_ON_ONCE(cpc->task_epc && cpc->task_epc != pmu_ctx);
+ cpc->task_epc = NULL;
+ }
+ }
+
if (!ctx->nr_events && ctx->is_active) {
if (ctx == &cpuctx->ctx)
update_cgrp_time_from_cpuctx(cpuctx, true);
ctx->is_active = 0;
- ctx->rotate_necessary = 0;
if (ctx->task) {
WARN_ON_ONCE(cpuctx->task_ctx != ctx);
cpuctx->task_ctx = NULL;
* event_function_call() user.
*/
raw_spin_lock_irq(&ctx->lock);
- /*
- * Cgroup events are per-cpu events, and must IPI because of
- * cgrp_cpuctx_list.
- */
- if (!ctx->is_active && !is_cgroup_event(event)) {
- __perf_remove_from_context(event, __get_cpu_context(ctx),
+ if (!ctx->is_active) {
+ __perf_remove_from_context(event, this_cpu_ptr(&perf_cpu_context),
ctx, (void *)flags);
raw_spin_unlock_irq(&ctx->lock);
return;
update_cgrp_time_from_event(event);
}
+ perf_pmu_disable(event->pmu_ctx->pmu);
+
if (event == event->group_leader)
- group_sched_out(event, cpuctx, ctx);
+ group_sched_out(event, ctx);
else
- event_sched_out(event, cpuctx, ctx);
+ event_sched_out(event, ctx);
perf_event_set_state(event, PERF_EVENT_STATE_OFF);
perf_cgroup_event_disable(event, ctx);
+
+ perf_pmu_enable(event->pmu_ctx->pmu);
}
/*
static void perf_log_itrace_start(struct perf_event *event);
static int
-event_sched_in(struct perf_event *event,
- struct perf_cpu_context *cpuctx,
- struct perf_event_context *ctx)
+event_sched_in(struct perf_event *event, struct perf_event_context *ctx)
{
+ struct perf_event_pmu_context *epc = event->pmu_ctx;
+ struct perf_cpu_pmu_context *cpc = this_cpu_ptr(epc->pmu->cpu_pmu_context);
int ret = 0;
WARN_ON_ONCE(event->ctx != ctx);
}
if (!is_software_event(event))
- cpuctx->active_oncpu++;
- if (!ctx->nr_active++)
- perf_event_ctx_activate(ctx);
+ cpc->active_oncpu++;
if (event->attr.freq && event->attr.sample_freq)
ctx->nr_freq++;
if (event->attr.exclusive)
- cpuctx->exclusive = 1;
+ cpc->exclusive = 1;
out:
perf_pmu_enable(event->pmu);
}
static int
-group_sched_in(struct perf_event *group_event,
- struct perf_cpu_context *cpuctx,
- struct perf_event_context *ctx)
+group_sched_in(struct perf_event *group_event, struct perf_event_context *ctx)
{
struct perf_event *event, *partial_group = NULL;
- struct pmu *pmu = ctx->pmu;
+ struct pmu *pmu = group_event->pmu_ctx->pmu;
if (group_event->state == PERF_EVENT_STATE_OFF)
return 0;
pmu->start_txn(pmu, PERF_PMU_TXN_ADD);
- if (event_sched_in(group_event, cpuctx, ctx))
+ if (event_sched_in(group_event, ctx))
goto error;
/*
* Schedule in siblings as one group (if any):
*/
for_each_sibling_event(event, group_event) {
- if (event_sched_in(event, cpuctx, ctx)) {
+ if (event_sched_in(event, ctx)) {
partial_group = event;
goto group_error;
}
if (event == partial_group)
break;
- event_sched_out(event, cpuctx, ctx);
+ event_sched_out(event, ctx);
}
- event_sched_out(group_event, cpuctx, ctx);
+ event_sched_out(group_event, ctx);
error:
pmu->cancel_txn(pmu);
/*
* Work out whether we can put this event group on the CPU now.
*/
-static int group_can_go_on(struct perf_event *event,
- struct perf_cpu_context *cpuctx,
- int can_add_hw)
+static int group_can_go_on(struct perf_event *event, int can_add_hw)
{
+ struct perf_event_pmu_context *epc = event->pmu_ctx;
+ struct perf_cpu_pmu_context *cpc = this_cpu_ptr(epc->pmu->cpu_pmu_context);
+
/*
* Groups consisting entirely of software events can always go on.
*/
* If an exclusive group is already on, no other hardware
* events can go on.
*/
- if (cpuctx->exclusive)
+ if (cpc->exclusive)
return 0;
/*
* If this group is exclusive and there are already
perf_group_attach(event);
}
-static void ctx_sched_out(struct perf_event_context *ctx,
- struct perf_cpu_context *cpuctx,
- enum event_type_t event_type);
-static void
-ctx_sched_in(struct perf_event_context *ctx,
- struct perf_cpu_context *cpuctx,
- enum event_type_t event_type);
-
-static void task_ctx_sched_out(struct perf_cpu_context *cpuctx,
- struct perf_event_context *ctx,
- enum event_type_t event_type)
+static void task_ctx_sched_out(struct perf_event_context *ctx,
+ enum event_type_t event_type)
{
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
+
if (!cpuctx->task_ctx)
return;
if (WARN_ON_ONCE(ctx != cpuctx->task_ctx))
return;
- ctx_sched_out(ctx, cpuctx, event_type);
+ ctx_sched_out(ctx, event_type);
}
static void perf_event_sched_in(struct perf_cpu_context *cpuctx,
struct perf_event_context *ctx)
{
- cpu_ctx_sched_in(cpuctx, EVENT_PINNED);
+ ctx_sched_in(&cpuctx->ctx, EVENT_PINNED);
if (ctx)
- ctx_sched_in(ctx, cpuctx, EVENT_PINNED);
- cpu_ctx_sched_in(cpuctx, EVENT_FLEXIBLE);
+ ctx_sched_in(ctx, EVENT_PINNED);
+ ctx_sched_in(&cpuctx->ctx, EVENT_FLEXIBLE);
if (ctx)
- ctx_sched_in(ctx, cpuctx, EVENT_FLEXIBLE);
+ ctx_sched_in(ctx, EVENT_FLEXIBLE);
}
/*
* event_type is a bit mask of the types of events involved. For CPU events,
* event_type is only either EVENT_PINNED or EVENT_FLEXIBLE.
*/
+/*
+ * XXX: ctx_resched() reschedule entire perf_event_context while adding new
+ * event to the context or enabling existing event in the context. We can
+ * probably optimize it by rescheduling only affected pmu_ctx.
+ */
static void ctx_resched(struct perf_cpu_context *cpuctx,
struct perf_event_context *task_ctx,
enum event_type_t event_type)
{
- enum event_type_t ctx_event_type;
bool cpu_event = !!(event_type & EVENT_CPU);
/*
if (event_type & EVENT_PINNED)
event_type |= EVENT_FLEXIBLE;
- ctx_event_type = event_type & EVENT_ALL;
+ event_type &= EVENT_ALL;
- perf_pmu_disable(cpuctx->ctx.pmu);
- if (task_ctx)
- task_ctx_sched_out(cpuctx, task_ctx, event_type);
+ perf_ctx_disable(&cpuctx->ctx);
+ if (task_ctx) {
+ perf_ctx_disable(task_ctx);
+ task_ctx_sched_out(task_ctx, event_type);
+ }
/*
* Decide which cpu ctx groups to schedule out based on the types
* - otherwise, do nothing more.
*/
if (cpu_event)
- cpu_ctx_sched_out(cpuctx, ctx_event_type);
- else if (ctx_event_type & EVENT_PINNED)
- cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);
+ ctx_sched_out(&cpuctx->ctx, event_type);
+ else if (event_type & EVENT_PINNED)
+ ctx_sched_out(&cpuctx->ctx, EVENT_FLEXIBLE);
perf_event_sched_in(cpuctx, task_ctx);
- perf_pmu_enable(cpuctx->ctx.pmu);
+
+ perf_ctx_enable(&cpuctx->ctx);
+ if (task_ctx)
+ perf_ctx_enable(task_ctx);
}
void perf_pmu_resched(struct pmu *pmu)
{
- struct perf_cpu_context *cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
struct perf_event_context *task_ctx = cpuctx->task_ctx;
perf_ctx_lock(cpuctx, task_ctx);
{
struct perf_event *event = info;
struct perf_event_context *ctx = event->ctx;
- struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
struct perf_event_context *task_ctx = cpuctx->task_ctx;
bool reprogram = true;
int ret = 0;
#endif
if (reprogram) {
- ctx_sched_out(ctx, cpuctx, EVENT_TIME);
+ ctx_sched_out(ctx, EVENT_TIME);
add_event_to_ctx(event, ctx);
ctx_resched(cpuctx, task_ctx, get_event_type(event));
} else {
WARN_ON_ONCE(!exclusive_event_installable(event, ctx));
if (event->cpu != -1)
- event->cpu = cpu;
+ WARN_ON_ONCE(event->cpu != cpu);
/*
* Ensures that if we can observe event->ctx, both the event and ctx
* perf_event_attr::disabled events will not run and can be initialized
* without IPI. Except when this is the first event for the context, in
* that case we need the magic of the IPI to set ctx->is_active.
- * Similarly, cgroup events for the context also needs the IPI to
- * manipulate the cgrp_cpuctx_list.
*
* The IOC_ENABLE that is sure to follow the creation of a disabled
* event will issue the IPI and reprogram the hardware.
return;
if (ctx->is_active)
- ctx_sched_out(ctx, cpuctx, EVENT_TIME);
+ ctx_sched_out(ctx, EVENT_TIME);
perf_event_set_state(event, PERF_EVENT_STATE_INACTIVE);
perf_cgroup_event_enable(event, ctx);
return;
if (!event_filter_match(event)) {
- ctx_sched_in(ctx, cpuctx, EVENT_TIME);
+ ctx_sched_in(ctx, EVENT_TIME);
return;
}
* then don't put it on unless the group is on.
*/
if (leader != event && leader->state != PERF_EVENT_STATE_ACTIVE) {
- ctx_sched_in(ctx, cpuctx, EVENT_TIME);
+ ctx_sched_in(ctx, EVENT_TIME);
return;
}
return err;
}
-static void ctx_sched_out(struct perf_event_context *ctx,
- struct perf_cpu_context *cpuctx,
- enum event_type_t event_type)
+static void __pmu_ctx_sched_out(struct perf_event_pmu_context *pmu_ctx,
+ enum event_type_t event_type)
{
+ struct perf_event_context *ctx = pmu_ctx->ctx;
struct perf_event *event, *tmp;
+ struct pmu *pmu = pmu_ctx->pmu;
+
+ if (ctx->task && !ctx->is_active) {
+ struct perf_cpu_pmu_context *cpc;
+
+ cpc = this_cpu_ptr(pmu->cpu_pmu_context);
+ WARN_ON_ONCE(cpc->task_epc && cpc->task_epc != pmu_ctx);
+ cpc->task_epc = NULL;
+ }
+
+ if (!event_type)
+ return;
+
+ perf_pmu_disable(pmu);
+ if (event_type & EVENT_PINNED) {
+ list_for_each_entry_safe(event, tmp,
+ &pmu_ctx->pinned_active,
+ active_list)
+ group_sched_out(event, ctx);
+ }
+
+ if (event_type & EVENT_FLEXIBLE) {
+ list_for_each_entry_safe(event, tmp,
+ &pmu_ctx->flexible_active,
+ active_list)
+ group_sched_out(event, ctx);
+ /*
+ * Since we cleared EVENT_FLEXIBLE, also clear
+ * rotate_necessary, is will be reset by
+ * ctx_flexible_sched_in() when needed.
+ */
+ pmu_ctx->rotate_necessary = 0;
+ }
+ perf_pmu_enable(pmu);
+}
+
+static void
+ctx_sched_out(struct perf_event_context *ctx, enum event_type_t event_type)
+{
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
+ struct perf_event_pmu_context *pmu_ctx;
int is_active = ctx->is_active;
lockdep_assert_held(&ctx->lock);
is_active ^= ctx->is_active; /* changed bits */
- if (!ctx->nr_active || !(is_active & EVENT_ALL))
- return;
-
- perf_pmu_disable(ctx->pmu);
- if (is_active & EVENT_PINNED) {
- list_for_each_entry_safe(event, tmp, &ctx->pinned_active, active_list)
- group_sched_out(event, cpuctx, ctx);
- }
-
- if (is_active & EVENT_FLEXIBLE) {
- list_for_each_entry_safe(event, tmp, &ctx->flexible_active, active_list)
- group_sched_out(event, cpuctx, ctx);
-
- /*
- * Since we cleared EVENT_FLEXIBLE, also clear
- * rotate_necessary, is will be reset by
- * ctx_flexible_sched_in() when needed.
- */
- ctx->rotate_necessary = 0;
- }
- perf_pmu_enable(ctx->pmu);
+ list_for_each_entry(pmu_ctx, &ctx->pmu_ctx_list, pmu_ctx_entry)
+ __pmu_ctx_sched_out(pmu_ctx, is_active);
}
/*
}
}
-static void perf_event_context_sched_out(struct task_struct *task, int ctxn,
- struct task_struct *next)
+#define double_list_for_each_entry(pos1, pos2, head1, head2, member) \
+ for (pos1 = list_first_entry(head1, typeof(*pos1), member), \
+ pos2 = list_first_entry(head2, typeof(*pos2), member); \
+ !list_entry_is_head(pos1, head1, member) && \
+ !list_entry_is_head(pos2, head2, member); \
+ pos1 = list_next_entry(pos1, member), \
+ pos2 = list_next_entry(pos2, member))
+
+static void perf_event_swap_task_ctx_data(struct perf_event_context *prev_ctx,
+ struct perf_event_context *next_ctx)
+{
+ struct perf_event_pmu_context *prev_epc, *next_epc;
+
+ if (!prev_ctx->nr_task_data)
+ return;
+
+ double_list_for_each_entry(prev_epc, next_epc,
+ &prev_ctx->pmu_ctx_list, &next_ctx->pmu_ctx_list,
+ pmu_ctx_entry) {
+
+ if (WARN_ON_ONCE(prev_epc->pmu != next_epc->pmu))
+ continue;
+
+ /*
+ * PMU specific parts of task perf context can require
+ * additional synchronization. As an example of such
+ * synchronization see implementation details of Intel
+ * LBR call stack data profiling;
+ */
+ if (prev_epc->pmu->swap_task_ctx)
+ prev_epc->pmu->swap_task_ctx(prev_epc, next_epc);
+ else
+ swap(prev_epc->task_ctx_data, next_epc->task_ctx_data);
+ }
+}
+
+static void perf_ctx_sched_task_cb(struct perf_event_context *ctx, bool sched_in)
+{
+ struct perf_event_pmu_context *pmu_ctx;
+ struct perf_cpu_pmu_context *cpc;
+
+ list_for_each_entry(pmu_ctx, &ctx->pmu_ctx_list, pmu_ctx_entry) {
+ cpc = this_cpu_ptr(pmu_ctx->pmu->cpu_pmu_context);
+
+ if (cpc->sched_cb_usage && pmu_ctx->pmu->sched_task)
+ pmu_ctx->pmu->sched_task(pmu_ctx, sched_in);
+ }
+}
+
+static void
+perf_event_context_sched_out(struct task_struct *task, struct task_struct *next)
{
- struct perf_event_context *ctx = task->perf_event_ctxp[ctxn];
+ struct perf_event_context *ctx = task->perf_event_ctxp;
struct perf_event_context *next_ctx;
struct perf_event_context *parent, *next_parent;
- struct perf_cpu_context *cpuctx;
int do_switch = 1;
- struct pmu *pmu;
if (likely(!ctx))
return;
- pmu = ctx->pmu;
- cpuctx = __get_cpu_context(ctx);
- if (!cpuctx->task_ctx)
- return;
-
rcu_read_lock();
- next_ctx = next->perf_event_ctxp[ctxn];
+ next_ctx = rcu_dereference(next->perf_event_ctxp);
if (!next_ctx)
goto unlock;
raw_spin_lock_nested(&next_ctx->lock, SINGLE_DEPTH_NESTING);
if (context_equiv(ctx, next_ctx)) {
- perf_pmu_disable(pmu);
+ perf_ctx_disable(ctx);
/* PMIs are disabled; ctx->nr_pending is stable. */
if (local_read(&ctx->nr_pending) ||
WRITE_ONCE(ctx->task, next);
WRITE_ONCE(next_ctx->task, task);
- if (cpuctx->sched_cb_usage && pmu->sched_task)
- pmu->sched_task(ctx, false);
-
- /*
- * PMU specific parts of task perf context can require
- * additional synchronization. As an example of such
- * synchronization see implementation details of Intel
- * LBR call stack data profiling;
- */
- if (pmu->swap_task_ctx)
- pmu->swap_task_ctx(ctx, next_ctx);
- else
- swap(ctx->task_ctx_data, next_ctx->task_ctx_data);
+ perf_ctx_sched_task_cb(ctx, false);
+ perf_event_swap_task_ctx_data(ctx, next_ctx);
- perf_pmu_enable(pmu);
+ perf_ctx_enable(ctx);
/*
* RCU_INIT_POINTER here is safe because we've not
* since those values are always verified under
* ctx->lock which we're now holding.
*/
- RCU_INIT_POINTER(task->perf_event_ctxp[ctxn], next_ctx);
- RCU_INIT_POINTER(next->perf_event_ctxp[ctxn], ctx);
+ RCU_INIT_POINTER(task->perf_event_ctxp, next_ctx);
+ RCU_INIT_POINTER(next->perf_event_ctxp, ctx);
do_switch = 0;
if (do_switch) {
raw_spin_lock(&ctx->lock);
- perf_pmu_disable(pmu);
+ perf_ctx_disable(ctx);
inside_switch:
- if (cpuctx->sched_cb_usage && pmu->sched_task)
- pmu->sched_task(ctx, false);
- task_ctx_sched_out(cpuctx, ctx, EVENT_ALL);
+ perf_ctx_sched_task_cb(ctx, false);
+ task_ctx_sched_out(ctx, EVENT_ALL);
- perf_pmu_enable(pmu);
+ perf_ctx_enable(ctx);
raw_spin_unlock(&ctx->lock);
}
}
static DEFINE_PER_CPU(struct list_head, sched_cb_list);
+static DEFINE_PER_CPU(int, perf_sched_cb_usages);
void perf_sched_cb_dec(struct pmu *pmu)
{
- struct perf_cpu_context *cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
+ struct perf_cpu_pmu_context *cpc = this_cpu_ptr(pmu->cpu_pmu_context);
this_cpu_dec(perf_sched_cb_usages);
+ barrier();
- if (!--cpuctx->sched_cb_usage)
- list_del(&cpuctx->sched_cb_entry);
+ if (!--cpc->sched_cb_usage)
+ list_del(&cpc->sched_cb_entry);
}
void perf_sched_cb_inc(struct pmu *pmu)
{
- struct perf_cpu_context *cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
+ struct perf_cpu_pmu_context *cpc = this_cpu_ptr(pmu->cpu_pmu_context);
- if (!cpuctx->sched_cb_usage++)
- list_add(&cpuctx->sched_cb_entry, this_cpu_ptr(&sched_cb_list));
+ if (!cpc->sched_cb_usage++)
+ list_add(&cpc->sched_cb_entry, this_cpu_ptr(&sched_cb_list));
+ barrier();
this_cpu_inc(perf_sched_cb_usages);
}
* PEBS requires this to provide PID/TID information. This requires we flush
* all queued PEBS records before we context switch to a new task.
*/
-static void __perf_pmu_sched_task(struct perf_cpu_context *cpuctx, bool sched_in)
+static void __perf_pmu_sched_task(struct perf_cpu_pmu_context *cpc, bool sched_in)
{
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
struct pmu *pmu;
- pmu = cpuctx->ctx.pmu; /* software PMUs will not have sched_task */
+ pmu = cpc->epc.pmu;
+ /* software PMUs will not have sched_task */
if (WARN_ON_ONCE(!pmu->sched_task))
return;
perf_ctx_lock(cpuctx, cpuctx->task_ctx);
perf_pmu_disable(pmu);
- pmu->sched_task(cpuctx->task_ctx, sched_in);
+ pmu->sched_task(cpc->task_epc, sched_in);
perf_pmu_enable(pmu);
perf_ctx_unlock(cpuctx, cpuctx->task_ctx);
struct task_struct *next,
bool sched_in)
{
- struct perf_cpu_context *cpuctx;
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
+ struct perf_cpu_pmu_context *cpc;
- if (prev == next)
+ /* cpuctx->task_ctx will be handled in perf_event_context_sched_in/out */
+ if (prev == next || cpuctx->task_ctx)
return;
- list_for_each_entry(cpuctx, this_cpu_ptr(&sched_cb_list), sched_cb_entry) {
- /* will be handled in perf_event_context_sched_in/out */
- if (cpuctx->task_ctx)
- continue;
-
- __perf_pmu_sched_task(cpuctx, sched_in);
- }
+ list_for_each_entry(cpc, this_cpu_ptr(&sched_cb_list), sched_cb_entry)
+ __perf_pmu_sched_task(cpc, sched_in);
}
static void perf_event_switch(struct task_struct *task,
struct task_struct *next_prev, bool sched_in);
-#define for_each_task_context_nr(ctxn) \
- for ((ctxn) = 0; (ctxn) < perf_nr_task_contexts; (ctxn)++)
-
/*
* Called from scheduler to remove the events of the current task,
* with interrupts disabled.
void __perf_event_task_sched_out(struct task_struct *task,
struct task_struct *next)
{
- int ctxn;
-
if (__this_cpu_read(perf_sched_cb_usages))
perf_pmu_sched_task(task, next, false);
if (atomic_read(&nr_switch_events))
perf_event_switch(task, next, false);
- for_each_task_context_nr(ctxn)
- perf_event_context_sched_out(task, ctxn, next);
+ perf_event_context_sched_out(task, next);
/*
* if cgroup events exist on this CPU, then we need
perf_cgroup_switch(next);
}
-/*
- * Called with IRQs disabled
- */
-static void cpu_ctx_sched_out(struct perf_cpu_context *cpuctx,
- enum event_type_t event_type)
-{
- ctx_sched_out(&cpuctx->ctx, cpuctx, event_type);
-}
-
static bool perf_less_group_idx(const void *l, const void *r)
{
const struct perf_event *le = *(const struct perf_event **)l;
}
}
-static noinline int visit_groups_merge(struct perf_cpu_context *cpuctx,
+static void __link_epc(struct perf_event_pmu_context *pmu_ctx)
+{
+ struct perf_cpu_pmu_context *cpc;
+
+ if (!pmu_ctx->ctx->task)
+ return;
+
+ cpc = this_cpu_ptr(pmu_ctx->pmu->cpu_pmu_context);
+ WARN_ON_ONCE(cpc->task_epc && cpc->task_epc != pmu_ctx);
+ cpc->task_epc = pmu_ctx;
+}
+
+static noinline int visit_groups_merge(struct perf_event_context *ctx,
struct perf_event_groups *groups, int cpu,
+ struct pmu *pmu,
int (*func)(struct perf_event *, void *),
void *data)
{
#ifdef CONFIG_CGROUP_PERF
struct cgroup_subsys_state *css = NULL;
#endif
+ struct perf_cpu_context *cpuctx = NULL;
/* Space for per CPU and/or any CPU event iterators. */
struct perf_event *itrs[2];
struct min_heap event_heap;
struct perf_event **evt;
int ret;
- if (cpuctx) {
+ if (pmu->filter && pmu->filter(pmu, cpu))
+ return 0;
+
+ if (!ctx->task) {
+ cpuctx = this_cpu_ptr(&perf_cpu_context);
event_heap = (struct min_heap){
.data = cpuctx->heap,
.nr = 0,
.size = ARRAY_SIZE(itrs),
};
/* Events not within a CPU context may be on any CPU. */
- __heap_add(&event_heap, perf_event_groups_first(groups, -1, NULL));
+ __heap_add(&event_heap, perf_event_groups_first(groups, -1, pmu, NULL));
}
evt = event_heap.data;
- __heap_add(&event_heap, perf_event_groups_first(groups, cpu, NULL));
+ __heap_add(&event_heap, perf_event_groups_first(groups, cpu, pmu, NULL));
#ifdef CONFIG_CGROUP_PERF
for (; css; css = css->parent)
- __heap_add(&event_heap, perf_event_groups_first(groups, cpu, css->cgroup));
+ __heap_add(&event_heap, perf_event_groups_first(groups, cpu, pmu, css->cgroup));
#endif
+ if (event_heap.nr) {
+ __link_epc((*evt)->pmu_ctx);
+ perf_assert_pmu_disabled((*evt)->pmu_ctx->pmu);
+ }
+
min_heapify_all(&event_heap, &perf_min_heap);
while (event_heap.nr) {
if (ret)
return ret;
- *evt = perf_event_groups_next(*evt);
+ *evt = perf_event_groups_next(*evt, pmu);
if (*evt)
min_heapify(&event_heap, 0, &perf_min_heap);
else
static int merge_sched_in(struct perf_event *event, void *data)
{
struct perf_event_context *ctx = event->ctx;
- struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
int *can_add_hw = data;
if (event->state <= PERF_EVENT_STATE_OFF)
if (!event_filter_match(event))
return 0;
- if (group_can_go_on(event, cpuctx, *can_add_hw)) {
- if (!group_sched_in(event, cpuctx, ctx))
+ if (group_can_go_on(event, *can_add_hw)) {
+ if (!group_sched_in(event, ctx))
list_add_tail(&event->active_list, get_event_list(event));
}
perf_cgroup_event_disable(event, ctx);
perf_event_set_state(event, PERF_EVENT_STATE_ERROR);
} else {
- ctx->rotate_necessary = 1;
- perf_mux_hrtimer_restart(cpuctx);
+ struct perf_cpu_pmu_context *cpc;
+
+ event->pmu_ctx->rotate_necessary = 1;
+ cpc = this_cpu_ptr(event->pmu_ctx->pmu->cpu_pmu_context);
+ perf_mux_hrtimer_restart(cpc);
group_update_userpage(event);
}
}
return 0;
}
-static void
-ctx_pinned_sched_in(struct perf_event_context *ctx,
- struct perf_cpu_context *cpuctx)
+static void ctx_pinned_sched_in(struct perf_event_context *ctx, struct pmu *pmu)
{
+ struct perf_event_pmu_context *pmu_ctx;
int can_add_hw = 1;
- if (ctx != &cpuctx->ctx)
- cpuctx = NULL;
-
- visit_groups_merge(cpuctx, &ctx->pinned_groups,
- smp_processor_id(),
- merge_sched_in, &can_add_hw);
+ if (pmu) {
+ visit_groups_merge(ctx, &ctx->pinned_groups,
+ smp_processor_id(), pmu,
+ merge_sched_in, &can_add_hw);
+ } else {
+ list_for_each_entry(pmu_ctx, &ctx->pmu_ctx_list, pmu_ctx_entry) {
+ can_add_hw = 1;
+ visit_groups_merge(ctx, &ctx->pinned_groups,
+ smp_processor_id(), pmu_ctx->pmu,
+ merge_sched_in, &can_add_hw);
+ }
+ }
}
-static void
-ctx_flexible_sched_in(struct perf_event_context *ctx,
- struct perf_cpu_context *cpuctx)
+static void ctx_flexible_sched_in(struct perf_event_context *ctx, struct pmu *pmu)
{
+ struct perf_event_pmu_context *pmu_ctx;
int can_add_hw = 1;
- if (ctx != &cpuctx->ctx)
- cpuctx = NULL;
+ if (pmu) {
+ visit_groups_merge(ctx, &ctx->flexible_groups,
+ smp_processor_id(), pmu,
+ merge_sched_in, &can_add_hw);
+ } else {
+ list_for_each_entry(pmu_ctx, &ctx->pmu_ctx_list, pmu_ctx_entry) {
+ can_add_hw = 1;
+ visit_groups_merge(ctx, &ctx->flexible_groups,
+ smp_processor_id(), pmu_ctx->pmu,
+ merge_sched_in, &can_add_hw);
+ }
+ }
+}
- visit_groups_merge(cpuctx, &ctx->flexible_groups,
- smp_processor_id(),
- merge_sched_in, &can_add_hw);
+static void __pmu_ctx_sched_in(struct perf_event_context *ctx, struct pmu *pmu)
+{
+ ctx_flexible_sched_in(ctx, pmu);
}
static void
-ctx_sched_in(struct perf_event_context *ctx,
- struct perf_cpu_context *cpuctx,
- enum event_type_t event_type)
+ctx_sched_in(struct perf_event_context *ctx, enum event_type_t event_type)
{
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
int is_active = ctx->is_active;
lockdep_assert_held(&ctx->lock);
* in order to give them the best chance of going on.
*/
if (is_active & EVENT_PINNED)
- ctx_pinned_sched_in(ctx, cpuctx);
+ ctx_pinned_sched_in(ctx, NULL);
/* Then walk through the lower prio flexible groups */
if (is_active & EVENT_FLEXIBLE)
- ctx_flexible_sched_in(ctx, cpuctx);
+ ctx_flexible_sched_in(ctx, NULL);
}
-static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx,
- enum event_type_t event_type)
+static void perf_event_context_sched_in(struct task_struct *task)
{
- struct perf_event_context *ctx = &cpuctx->ctx;
-
- ctx_sched_in(ctx, cpuctx, event_type);
-}
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
+ struct perf_event_context *ctx;
-static void perf_event_context_sched_in(struct perf_event_context *ctx,
- struct task_struct *task)
-{
- struct perf_cpu_context *cpuctx;
- struct pmu *pmu;
+ rcu_read_lock();
+ ctx = rcu_dereference(task->perf_event_ctxp);
+ if (!ctx)
+ goto rcu_unlock;
- cpuctx = __get_cpu_context(ctx);
+ if (cpuctx->task_ctx == ctx) {
+ perf_ctx_lock(cpuctx, ctx);
+ perf_ctx_disable(ctx);
- /*
- * HACK: for HETEROGENEOUS the task context might have switched to a
- * different PMU, force (re)set the context,
- */
- pmu = ctx->pmu = cpuctx->ctx.pmu;
+ perf_ctx_sched_task_cb(ctx, true);
- if (cpuctx->task_ctx == ctx) {
- if (cpuctx->sched_cb_usage)
- __perf_pmu_sched_task(cpuctx, true);
- return;
+ perf_ctx_enable(ctx);
+ perf_ctx_unlock(cpuctx, ctx);
+ goto rcu_unlock;
}
perf_ctx_lock(cpuctx, ctx);
if (!ctx->nr_events)
goto unlock;
- perf_pmu_disable(pmu);
+ perf_ctx_disable(ctx);
/*
* We want to keep the following priority order:
* cpu pinned (that don't need to move), task pinned,
* However, if task's ctx is not carrying any pinned
* events, no need to flip the cpuctx's events around.
*/
- if (!RB_EMPTY_ROOT(&ctx->pinned_groups.tree))
- cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);
+ if (!RB_EMPTY_ROOT(&ctx->pinned_groups.tree)) {
+ perf_ctx_disable(&cpuctx->ctx);
+ ctx_sched_out(&cpuctx->ctx, EVENT_FLEXIBLE);
+ }
+
perf_event_sched_in(cpuctx, ctx);
- if (cpuctx->sched_cb_usage && pmu->sched_task)
- pmu->sched_task(cpuctx->task_ctx, true);
+ perf_ctx_sched_task_cb(cpuctx->task_ctx, true);
- perf_pmu_enable(pmu);
+ if (!RB_EMPTY_ROOT(&ctx->pinned_groups.tree))
+ perf_ctx_enable(&cpuctx->ctx);
+
+ perf_ctx_enable(ctx);
unlock:
perf_ctx_unlock(cpuctx, ctx);
+rcu_unlock:
+ rcu_read_unlock();
}
/*
void __perf_event_task_sched_in(struct task_struct *prev,
struct task_struct *task)
{
- struct perf_event_context *ctx;
- int ctxn;
-
- for_each_task_context_nr(ctxn) {
- ctx = task->perf_event_ctxp[ctxn];
- if (likely(!ctx))
- continue;
-
- perf_event_context_sched_in(ctx, task);
- }
+ perf_event_context_sched_in(task);
if (atomic_read(&nr_switch_events))
perf_event_switch(task, prev, true);
* events. At the same time, make sure, having freq events does not change
* the rate of unthrottling as that would introduce bias.
*/
-static void perf_adjust_freq_unthr_context(struct perf_event_context *ctx,
- int needs_unthr)
+static void
+perf_adjust_freq_unthr_context(struct perf_event_context *ctx, bool unthrottle)
{
struct perf_event *event;
struct hw_perf_event *hwc;
* - context have events in frequency mode (needs freq adjust)
* - there are events to unthrottle on this cpu
*/
- if (!(ctx->nr_freq || needs_unthr))
+ if (!(ctx->nr_freq || unthrottle))
return;
raw_spin_lock(&ctx->lock);
- perf_pmu_disable(ctx->pmu);
list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
if (event->state != PERF_EVENT_STATE_ACTIVE)
continue;
+ // XXX use visit thingy to avoid the -1,cpu match
if (!event_filter_match(event))
continue;
perf_pmu_enable(event->pmu);
}
- perf_pmu_enable(ctx->pmu);
raw_spin_unlock(&ctx->lock);
}
/* pick an event from the flexible_groups to rotate */
static inline struct perf_event *
-ctx_event_to_rotate(struct perf_event_context *ctx)
+ctx_event_to_rotate(struct perf_event_pmu_context *pmu_ctx)
{
struct perf_event *event;
+ struct rb_node *node;
+ struct rb_root *tree;
+ struct __group_key key = {
+ .pmu = pmu_ctx->pmu,
+ };
/* pick the first active flexible event */
- event = list_first_entry_or_null(&ctx->flexible_active,
+ event = list_first_entry_or_null(&pmu_ctx->flexible_active,
struct perf_event, active_list);
+ if (event)
+ goto out;
/* if no active flexible event, pick the first event */
- if (!event) {
- event = rb_entry_safe(rb_first(&ctx->flexible_groups.tree),
- typeof(*event), group_node);
+ tree = &pmu_ctx->ctx->flexible_groups.tree;
+
+ if (!pmu_ctx->ctx->task) {
+ key.cpu = smp_processor_id();
+
+ node = rb_find_first(&key, tree, __group_cmp_ignore_cgroup);
+ if (node)
+ event = __node_2_pe(node);
+ goto out;
}
- /*
+ key.cpu = -1;
+ node = rb_find_first(&key, tree, __group_cmp_ignore_cgroup);
+ if (node) {
+ event = __node_2_pe(node);
+ goto out;
+ }
+
+ key.cpu = smp_processor_id();
+ node = rb_find_first(&key, tree, __group_cmp_ignore_cgroup);
+ if (node)
+ event = __node_2_pe(node);
+
+out:
+ /*
* Unconditionally clear rotate_necessary; if ctx_flexible_sched_in()
* finds there are unschedulable events, it will set it again.
*/
- ctx->rotate_necessary = 0;
+ pmu_ctx->rotate_necessary = 0;
return event;
}
-static bool perf_rotate_context(struct perf_cpu_context *cpuctx)
+static bool perf_rotate_context(struct perf_cpu_pmu_context *cpc)
{
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
+ struct perf_event_pmu_context *cpu_epc, *task_epc = NULL;
struct perf_event *cpu_event = NULL, *task_event = NULL;
struct perf_event_context *task_ctx = NULL;
int cpu_rotate, task_rotate;
+ struct pmu *pmu;
/*
* Since we run this from IRQ context, nobody can install new
* events, thus the event count values are stable.
*/
- cpu_rotate = cpuctx->ctx.rotate_necessary;
+ cpu_epc = &cpc->epc;
+ pmu = cpu_epc->pmu;
+ task_epc = cpc->task_epc;
+
+ cpu_rotate = cpu_epc->rotate_necessary;
task_ctx = cpuctx->task_ctx;
- task_rotate = task_ctx ? task_ctx->rotate_necessary : 0;
+ task_rotate = task_epc ? task_epc->rotate_necessary : 0;
if (!(cpu_rotate || task_rotate))
return false;
perf_ctx_lock(cpuctx, cpuctx->task_ctx);
- perf_pmu_disable(cpuctx->ctx.pmu);
+ perf_pmu_disable(pmu);
if (task_rotate)
- task_event = ctx_event_to_rotate(task_ctx);
+ task_event = ctx_event_to_rotate(task_epc);
if (cpu_rotate)
- cpu_event = ctx_event_to_rotate(&cpuctx->ctx);
+ cpu_event = ctx_event_to_rotate(cpu_epc);
/*
* As per the order given at ctx_resched() first 'pop' task flexible
* and then, if needed CPU flexible.
*/
- if (task_event || (task_ctx && cpu_event))
- ctx_sched_out(task_ctx, cpuctx, EVENT_FLEXIBLE);
- if (cpu_event)
- cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);
+ if (task_event || (task_epc && cpu_event)) {
+ update_context_time(task_epc->ctx);
+ __pmu_ctx_sched_out(task_epc, EVENT_FLEXIBLE);
+ }
- if (task_event)
- rotate_ctx(task_ctx, task_event);
- if (cpu_event)
+ if (cpu_event) {
+ update_context_time(&cpuctx->ctx);
+ __pmu_ctx_sched_out(cpu_epc, EVENT_FLEXIBLE);
rotate_ctx(&cpuctx->ctx, cpu_event);
+ __pmu_ctx_sched_in(&cpuctx->ctx, pmu);
+ }
- perf_event_sched_in(cpuctx, task_ctx);
+ if (task_event)
+ rotate_ctx(task_epc->ctx, task_event);
+
+ if (task_event || (task_epc && cpu_event))
+ __pmu_ctx_sched_in(task_epc->ctx, pmu);
- perf_pmu_enable(cpuctx->ctx.pmu);
+ perf_pmu_enable(pmu);
perf_ctx_unlock(cpuctx, cpuctx->task_ctx);
return true;
void perf_event_task_tick(void)
{
- struct list_head *head = this_cpu_ptr(&active_ctx_list);
- struct perf_event_context *ctx, *tmp;
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
+ struct perf_event_context *ctx;
int throttled;
lockdep_assert_irqs_disabled();
throttled = __this_cpu_xchg(perf_throttled_count, 0);
tick_dep_clear_cpu(smp_processor_id(), TICK_DEP_BIT_PERF_EVENTS);
- list_for_each_entry_safe(ctx, tmp, head, active_ctx_list)
- perf_adjust_freq_unthr_context(ctx, throttled);
+ perf_adjust_freq_unthr_context(&cpuctx->ctx, !!throttled);
+
+ rcu_read_lock();
+ ctx = rcu_dereference(current->perf_event_ctxp);
+ if (ctx)
+ perf_adjust_freq_unthr_context(ctx, !!throttled);
+ rcu_read_unlock();
}
static int event_enable_on_exec(struct perf_event *event,
* Enable all of a task's events that have been marked enable-on-exec.
* This expects task == current.
*/
-static void perf_event_enable_on_exec(int ctxn)
+static void perf_event_enable_on_exec(struct perf_event_context *ctx)
{
- struct perf_event_context *ctx, *clone_ctx = NULL;
+ struct perf_event_context *clone_ctx = NULL;
enum event_type_t event_type = 0;
struct perf_cpu_context *cpuctx;
struct perf_event *event;
int enabled = 0;
local_irq_save(flags);
- ctx = current->perf_event_ctxp[ctxn];
- if (!ctx || !ctx->nr_events)
+ if (WARN_ON_ONCE(current->perf_event_ctxp != ctx))
+ goto out;
+
+ if (!ctx->nr_events)
goto out;
- cpuctx = __get_cpu_context(ctx);
+ cpuctx = this_cpu_ptr(&perf_cpu_context);
perf_ctx_lock(cpuctx, ctx);
- ctx_sched_out(ctx, cpuctx, EVENT_TIME);
+ ctx_sched_out(ctx, EVENT_TIME);
+
list_for_each_entry(event, &ctx->event_list, event_entry) {
enabled |= event_enable_on_exec(event, ctx);
event_type |= get_event_type(event);
clone_ctx = unclone_ctx(ctx);
ctx_resched(cpuctx, ctx, event_type);
} else {
- ctx_sched_in(ctx, cpuctx, EVENT_TIME);
+ ctx_sched_in(ctx, EVENT_TIME);
}
perf_ctx_unlock(cpuctx, ctx);
* Removes all events from the current task that have been marked
* remove-on-exec, and feeds their values back to parent events.
*/
-static void perf_event_remove_on_exec(int ctxn)
+static void perf_event_remove_on_exec(struct perf_event_context *ctx)
{
- struct perf_event_context *ctx, *clone_ctx = NULL;
+ struct perf_event_context *clone_ctx = NULL;
struct perf_event *event, *next;
unsigned long flags;
bool modified = false;
- ctx = perf_pin_task_context(current, ctxn);
- if (!ctx)
- return;
-
mutex_lock(&ctx->mutex);
if (WARN_ON_ONCE(ctx->task != current))
raw_spin_lock_irqsave(&ctx->lock, flags);
if (modified)
clone_ctx = unclone_ctx(ctx);
- --ctx->pin_count;
raw_spin_unlock_irqrestore(&ctx->lock, flags);
unlock:
mutex_unlock(&ctx->mutex);
- put_ctx(ctx);
if (clone_ctx)
put_ctx(clone_ctx);
}
struct perf_read_data *data = info;
struct perf_event *sub, *event = data->event;
struct perf_event_context *ctx = event->ctx;
- struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
struct pmu *pmu = event->pmu;
/*
{
raw_spin_lock_init(&ctx->lock);
mutex_init(&ctx->mutex);
- INIT_LIST_HEAD(&ctx->active_ctx_list);
+ INIT_LIST_HEAD(&ctx->pmu_ctx_list);
perf_event_groups_init(&ctx->pinned_groups);
perf_event_groups_init(&ctx->flexible_groups);
INIT_LIST_HEAD(&ctx->event_list);
- INIT_LIST_HEAD(&ctx->pinned_active);
- INIT_LIST_HEAD(&ctx->flexible_active);
refcount_set(&ctx->refcount, 1);
}
+static void
+__perf_init_event_pmu_context(struct perf_event_pmu_context *epc, struct pmu *pmu)
+{
+ epc->pmu = pmu;
+ INIT_LIST_HEAD(&epc->pmu_ctx_entry);
+ INIT_LIST_HEAD(&epc->pinned_active);
+ INIT_LIST_HEAD(&epc->flexible_active);
+ atomic_set(&epc->refcount, 1);
+}
+
static struct perf_event_context *
-alloc_perf_context(struct pmu *pmu, struct task_struct *task)
+alloc_perf_context(struct task_struct *task)
{
struct perf_event_context *ctx;
__perf_event_init_context(ctx);
if (task)
ctx->task = get_task_struct(task);
- ctx->pmu = pmu;
return ctx;
}
* Returns a matching context with refcount and pincount.
*/
static struct perf_event_context *
-find_get_context(struct pmu *pmu, struct task_struct *task,
- struct perf_event *event)
+find_get_context(struct task_struct *task, struct perf_event *event)
{
struct perf_event_context *ctx, *clone_ctx = NULL;
struct perf_cpu_context *cpuctx;
- void *task_ctx_data = NULL;
unsigned long flags;
- int ctxn, err;
- int cpu = event->cpu;
+ int err;
if (!task) {
/* Must be root to operate on a CPU event: */
if (err)
return ERR_PTR(err);
- cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu);
+ cpuctx = per_cpu_ptr(&perf_cpu_context, event->cpu);
ctx = &cpuctx->ctx;
get_ctx(ctx);
raw_spin_lock_irqsave(&ctx->lock, flags);
}
err = -EINVAL;
- ctxn = pmu->task_ctx_nr;
- if (ctxn < 0)
- goto errout;
-
- if (event->attach_state & PERF_ATTACH_TASK_DATA) {
- task_ctx_data = alloc_task_ctx_data(pmu);
- if (!task_ctx_data) {
- err = -ENOMEM;
- goto errout;
- }
- }
-
retry:
- ctx = perf_lock_task_context(task, ctxn, &flags);
+ ctx = perf_lock_task_context(task, &flags);
if (ctx) {
clone_ctx = unclone_ctx(ctx);
++ctx->pin_count;
- if (task_ctx_data && !ctx->task_ctx_data) {
- ctx->task_ctx_data = task_ctx_data;
- task_ctx_data = NULL;
- }
raw_spin_unlock_irqrestore(&ctx->lock, flags);
if (clone_ctx)
put_ctx(clone_ctx);
} else {
- ctx = alloc_perf_context(pmu, task);
+ ctx = alloc_perf_context(task);
err = -ENOMEM;
if (!ctx)
goto errout;
- if (task_ctx_data) {
- ctx->task_ctx_data = task_ctx_data;
- task_ctx_data = NULL;
- }
-
err = 0;
mutex_lock(&task->perf_event_mutex);
/*
*/
if (task->flags & PF_EXITING)
err = -ESRCH;
- else if (task->perf_event_ctxp[ctxn])
+ else if (task->perf_event_ctxp)
err = -EAGAIN;
else {
get_ctx(ctx);
++ctx->pin_count;
- rcu_assign_pointer(task->perf_event_ctxp[ctxn], ctx);
+ rcu_assign_pointer(task->perf_event_ctxp, ctx);
}
mutex_unlock(&task->perf_event_mutex);
}
}
- free_task_ctx_data(pmu, task_ctx_data);
return ctx;
errout:
- free_task_ctx_data(pmu, task_ctx_data);
return ERR_PTR(err);
}
+static struct perf_event_pmu_context *
+find_get_pmu_context(struct pmu *pmu, struct perf_event_context *ctx,
+ struct perf_event *event)
+{
+ struct perf_event_pmu_context *new = NULL, *epc;
+ void *task_ctx_data = NULL;
+
+ if (!ctx->task) {
+ struct perf_cpu_pmu_context *cpc;
+
+ cpc = per_cpu_ptr(pmu->cpu_pmu_context, event->cpu);
+ epc = &cpc->epc;
+
+ if (!epc->ctx) {
+ atomic_set(&epc->refcount, 1);
+ epc->embedded = 1;
+ raw_spin_lock_irq(&ctx->lock);
+ list_add(&epc->pmu_ctx_entry, &ctx->pmu_ctx_list);
+ epc->ctx = ctx;
+ raw_spin_unlock_irq(&ctx->lock);
+ } else {
+ WARN_ON_ONCE(epc->ctx != ctx);
+ atomic_inc(&epc->refcount);
+ }
+
+ return epc;
+ }
+
+ new = kzalloc(sizeof(*epc), GFP_KERNEL);
+ if (!new)
+ return ERR_PTR(-ENOMEM);
+
+ if (event->attach_state & PERF_ATTACH_TASK_DATA) {
+ task_ctx_data = alloc_task_ctx_data(pmu);
+ if (!task_ctx_data) {
+ kfree(new);
+ return ERR_PTR(-ENOMEM);
+ }
+ }
+
+ __perf_init_event_pmu_context(new, pmu);
+
+ /*
+ * XXX
+ *
+ * lockdep_assert_held(&ctx->mutex);
+ *
+ * can't because perf_event_init_task() doesn't actually hold the
+ * child_ctx->mutex.
+ */
+
+ raw_spin_lock_irq(&ctx->lock);
+ list_for_each_entry(epc, &ctx->pmu_ctx_list, pmu_ctx_entry) {
+ if (epc->pmu == pmu) {
+ WARN_ON_ONCE(epc->ctx != ctx);
+ atomic_inc(&epc->refcount);
+ goto found_epc;
+ }
+ }
+
+ epc = new;
+ new = NULL;
+
+ list_add(&epc->pmu_ctx_entry, &ctx->pmu_ctx_list);
+ epc->ctx = ctx;
+
+found_epc:
+ if (task_ctx_data && !epc->task_ctx_data) {
+ epc->task_ctx_data = task_ctx_data;
+ task_ctx_data = NULL;
+ ctx->nr_task_data++;
+ }
+ raw_spin_unlock_irq(&ctx->lock);
+
+ free_task_ctx_data(pmu, task_ctx_data);
+ kfree(new);
+
+ return epc;
+}
+
+static void get_pmu_ctx(struct perf_event_pmu_context *epc)
+{
+ WARN_ON_ONCE(!atomic_inc_not_zero(&epc->refcount));
+}
+
+static void free_epc_rcu(struct rcu_head *head)
+{
+ struct perf_event_pmu_context *epc = container_of(head, typeof(*epc), rcu_head);
+
+ kfree(epc->task_ctx_data);
+ kfree(epc);
+}
+
+static void put_pmu_ctx(struct perf_event_pmu_context *epc)
+{
+ unsigned long flags;
+
+ if (!atomic_dec_and_test(&epc->refcount))
+ return;
+
+ if (epc->ctx) {
+ struct perf_event_context *ctx = epc->ctx;
+
+ /*
+ * XXX
+ *
+ * lockdep_assert_held(&ctx->mutex);
+ *
+ * can't because of the call-site in _free_event()/put_event()
+ * which isn't always called under ctx->mutex.
+ */
+
+ WARN_ON_ONCE(list_empty(&epc->pmu_ctx_entry));
+ raw_spin_lock_irqsave(&ctx->lock, flags);
+ list_del_init(&epc->pmu_ctx_entry);
+ epc->ctx = NULL;
+ raw_spin_unlock_irqrestore(&ctx->lock, flags);
+ }
+
+ WARN_ON_ONCE(!list_empty(&epc->pinned_active));
+ WARN_ON_ONCE(!list_empty(&epc->flexible_active));
+
+ if (epc->embedded)
+ return;
+
+ call_rcu(&epc->rcu_head, free_epc_rcu);
+}
+
static void perf_event_free_filter(struct perf_event *event);
static void free_event_rcu(struct rcu_head *head)
{
- struct perf_event *event;
+ struct perf_event *event = container_of(head, typeof(*event), rcu_head);
- event = container_of(head, struct perf_event, rcu_head);
if (event->ns)
put_pid_ns(event->ns);
perf_event_free_filter(event);
*
* 1) cpu-wide events in the presence of per-task events,
* 2) per-task events in the presence of cpu-wide events,
- * 3) two matching events on the same context.
+ * 3) two matching events on the same perf_event_context.
*
* The former two cases are handled in the allocation path (perf_event_alloc(),
* _free_event()), the latter -- before the first perf_install_in_context().
if (event->hw.target)
put_task_struct(event->hw.target);
+ if (event->pmu_ctx)
+ put_pmu_ctx(event->pmu_ctx);
+
/*
* perf_event_free_task() relies on put_ctx() being 'last', in particular
* all task references must be cleaned up.
LIST_HEAD(free_list);
/*
- * If we got here through err_file: fput(event_file); we will not have
- * attached to a context yet.
+ * If we got here through err_alloc: free_event(event); we will not
+ * have attached to a context yet.
*/
if (!ctx) {
WARN_ON_ONCE(event->attach_state &
active = (event->state == PERF_EVENT_STATE_ACTIVE);
if (active) {
- perf_pmu_disable(ctx->pmu);
+ perf_pmu_disable(event->pmu);
/*
* We could be throttled; unthrottle now to avoid the tick
* trying to unthrottle while we already re-started the event.
if (active) {
event->pmu->start(event, PERF_EF_RELOAD);
- perf_pmu_enable(ctx->pmu);
+ perf_pmu_enable(event->pmu);
}
}
struct perf_event_context *task_ctx)
{
struct perf_event_context *ctx;
- int ctxn;
rcu_read_lock();
preempt_disable();
perf_iterate_sb_cpu(output, data);
- for_each_task_context_nr(ctxn) {
- ctx = rcu_dereference(current->perf_event_ctxp[ctxn]);
- if (ctx)
- perf_iterate_ctx(ctx, output, data, false);
- }
+ ctx = rcu_dereference(current->perf_event_ctxp);
+ if (ctx)
+ perf_iterate_ctx(ctx, output, data, false);
done:
preempt_enable();
rcu_read_unlock();
void perf_event_exec(void)
{
struct perf_event_context *ctx;
- int ctxn;
- for_each_task_context_nr(ctxn) {
- perf_event_enable_on_exec(ctxn);
- perf_event_remove_on_exec(ctxn);
+ ctx = perf_pin_task_context(current);
+ if (!ctx)
+ return;
+
+ perf_event_enable_on_exec(ctx);
+ perf_event_remove_on_exec(ctx);
+ perf_iterate_ctx(ctx, perf_event_addr_filters_exec, NULL, true);
- rcu_read_lock();
- ctx = rcu_dereference(current->perf_event_ctxp[ctxn]);
- if (ctx) {
- perf_iterate_ctx(ctx, perf_event_addr_filters_exec,
- NULL, true);
- }
- rcu_read_unlock();
- }
+ perf_unpin_context(ctx);
+ put_ctx(ctx);
}
struct remote_output {
static int __perf_pmu_output_stop(void *info)
{
struct perf_event *event = info;
- struct pmu *pmu = event->ctx->pmu;
- struct perf_cpu_context *cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
struct remote_output ro = {
.rb = event->rb,
};
static void perf_addr_filters_adjust(struct vm_area_struct *vma)
{
struct perf_event_context *ctx;
- int ctxn;
/*
* Data tracing isn't supported yet and as such there is no need
return;
rcu_read_lock();
- for_each_task_context_nr(ctxn) {
- ctx = rcu_dereference(current->perf_event_ctxp[ctxn]);
- if (!ctx)
- continue;
-
+ ctx = rcu_dereference(current->perf_event_ctxp);
+ if (ctx)
perf_iterate_ctx(ctx, __perf_addr_filters_adjust, vma, true);
- }
rcu_read_unlock();
}
struct trace_entry *entry = record;
rcu_read_lock();
- ctx = rcu_dereference(task->perf_event_ctxp[perf_sw_context]);
+ ctx = rcu_dereference(task->perf_event_ctxp);
if (!ctx)
goto unlock;
+ // XXX iterate groups instead, we should be able to
+ // find the subtree for the perf_tracepoint pmu and CPU.
+
list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
if (event->cpu != smp_processor_id())
continue;
return 0;
}
-/*
- * Ensures all contexts with the same task_ctx_nr have the same
- * pmu_cpu_context too.
- */
-static struct perf_cpu_context __percpu *find_pmu_context(int ctxn)
-{
- struct pmu *pmu;
-
- if (ctxn < 0)
- return NULL;
-
- list_for_each_entry(pmu, &pmus, entry) {
- if (pmu->task_ctx_nr == ctxn)
- return pmu->pmu_cpu_context;
- }
-
- return NULL;
-}
-
static void free_pmu_context(struct pmu *pmu)
{
- /*
- * Static contexts such as perf_sw_context have a global lifetime
- * and may be shared between different PMUs. Avoid freeing them
- * when a single PMU is going away.
- */
- if (pmu->task_ctx_nr > perf_invalid_context)
- return;
-
- free_percpu(pmu->pmu_cpu_context);
+ free_percpu(pmu->cpu_pmu_context);
}
/*
/* update all cpuctx for this PMU */
cpus_read_lock();
for_each_online_cpu(cpu) {
- struct perf_cpu_context *cpuctx;
- cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu);
- cpuctx->hrtimer_interval = ns_to_ktime(NSEC_PER_MSEC * timer);
+ struct perf_cpu_pmu_context *cpc;
+ cpc = per_cpu_ptr(pmu->cpu_pmu_context, cpu);
+ cpc->hrtimer_interval = ns_to_ktime(NSEC_PER_MSEC * timer);
cpu_function_call(cpu,
- (remote_function_f)perf_mux_hrtimer_restart, cpuctx);
+ (remote_function_f)perf_mux_hrtimer_restart, cpc);
}
cpus_read_unlock();
mutex_unlock(&mux_interval_mutex);
}
skip_type:
- if (pmu->task_ctx_nr == perf_hw_context) {
- static int hw_context_taken = 0;
-
- /*
- * Other than systems with heterogeneous CPUs, it never makes
- * sense for two PMUs to share perf_hw_context. PMUs which are
- * uncore must use perf_invalid_context.
- */
- if (WARN_ON_ONCE(hw_context_taken &&
- !(pmu->capabilities & PERF_PMU_CAP_HETEROGENEOUS_CPUS)))
- pmu->task_ctx_nr = perf_invalid_context;
-
- hw_context_taken = 1;
- }
-
- pmu->pmu_cpu_context = find_pmu_context(pmu->task_ctx_nr);
- if (pmu->pmu_cpu_context)
- goto got_cpu_context;
-
ret = -ENOMEM;
- pmu->pmu_cpu_context = alloc_percpu(struct perf_cpu_context);
- if (!pmu->pmu_cpu_context)
+ pmu->cpu_pmu_context = alloc_percpu(struct perf_cpu_pmu_context);
+ if (!pmu->cpu_pmu_context)
goto free_dev;
for_each_possible_cpu(cpu) {
- struct perf_cpu_context *cpuctx;
-
- cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu);
- __perf_event_init_context(&cpuctx->ctx);
- lockdep_set_class(&cpuctx->ctx.mutex, &cpuctx_mutex);
- lockdep_set_class(&cpuctx->ctx.lock, &cpuctx_lock);
- cpuctx->ctx.pmu = pmu;
- cpuctx->online = cpumask_test_cpu(cpu, perf_online_mask);
-
- __perf_mux_hrtimer_init(cpuctx, cpu);
+ struct perf_cpu_pmu_context *cpc;
- cpuctx->heap_size = ARRAY_SIZE(cpuctx->heap_default);
- cpuctx->heap = cpuctx->heap_default;
+ cpc = per_cpu_ptr(pmu->cpu_pmu_context, cpu);
+ __perf_init_event_pmu_context(&cpc->epc, pmu);
+ __perf_mux_hrtimer_init(cpc, cpu);
}
-got_cpu_context:
if (!pmu->start_txn) {
if (pmu->pmu_enable) {
/*
}
/*
- * Disallow uncore-cgroup events, they don't make sense as the cgroup will
- * be different on other CPUs in the uncore mask.
+ * Disallow uncore-task events. Similarly, disallow uncore-cgroup
+ * events (they don't make sense as the cgroup will be different
+ * on other CPUs in the uncore mask).
*/
- if (pmu->task_ctx_nr == perf_invalid_context && cgroup_fd != -1) {
+ if (pmu->task_ctx_nr == perf_invalid_context && (task || cgroup_fd != -1)) {
err = -EINVAL;
goto err_pmu;
}
return 0;
}
-/*
- * Variation on perf_event_ctx_lock_nested(), except we take two context
- * mutexes.
- */
-static struct perf_event_context *
-__perf_event_ctx_lock_double(struct perf_event *group_leader,
- struct perf_event_context *ctx)
-{
- struct perf_event_context *gctx;
-
-again:
- rcu_read_lock();
- gctx = READ_ONCE(group_leader->ctx);
- if (!refcount_inc_not_zero(&gctx->refcount)) {
- rcu_read_unlock();
- goto again;
- }
- rcu_read_unlock();
-
- mutex_lock_double(&gctx->mutex, &ctx->mutex);
-
- if (group_leader->ctx != gctx) {
- mutex_unlock(&ctx->mutex);
- mutex_unlock(&gctx->mutex);
- put_ctx(gctx);
- goto again;
- }
-
- return gctx;
-}
-
static bool
perf_check_permission(struct perf_event_attr *attr, struct task_struct *task)
{
pid_t, pid, int, cpu, int, group_fd, unsigned long, flags)
{
struct perf_event *group_leader = NULL, *output_event = NULL;
+ struct perf_event_pmu_context *pmu_ctx;
struct perf_event *event, *sibling;
struct perf_event_attr attr;
- struct perf_event_context *ctx, *gctx;
+ struct perf_event_context *ctx;
struct file *event_file = NULL;
struct fd group = {NULL, 0};
struct task_struct *task = NULL;
if (pmu->task_ctx_nr == perf_sw_context)
event->event_caps |= PERF_EV_CAP_SOFTWARE;
- if (group_leader) {
- if (is_software_event(event) &&
- !in_software_context(group_leader)) {
- /*
- * If the event is a sw event, but the group_leader
- * is on hw context.
- *
- * Allow the addition of software events to hw
- * groups, this is safe because software events
- * never fail to schedule.
- */
- pmu = group_leader->ctx->pmu;
- } else if (!is_software_event(event) &&
- is_software_event(group_leader) &&
- (group_leader->group_caps & PERF_EV_CAP_SOFTWARE)) {
- /*
- * In case the group is a pure software group, and we
- * try to add a hardware event, move the whole group to
- * the hardware context.
- */
- move_group = 1;
- }
+ if (task) {
+ err = down_read_interruptible(&task->signal->exec_update_lock);
+ if (err)
+ goto err_alloc;
+
+ /*
+ * We must hold exec_update_lock across this and any potential
+ * perf_install_in_context() call for this new event to
+ * serialize against exec() altering our credentials (and the
+ * perf_event_exit_task() that could imply).
+ */
+ err = -EACCES;
+ if (!perf_check_permission(&attr, task))
+ goto err_cred;
}
/*
* Get the target context (task or percpu):
*/
- ctx = find_get_context(pmu, task, event);
+ ctx = find_get_context(task, event);
if (IS_ERR(ctx)) {
err = PTR_ERR(ctx);
- goto err_alloc;
+ goto err_cred;
+ }
+
+ mutex_lock(&ctx->mutex);
+
+ if (ctx->task == TASK_TOMBSTONE) {
+ err = -ESRCH;
+ goto err_locked;
+ }
+
+ if (!task) {
+ /*
+ * Check if the @cpu we're creating an event for is online.
+ *
+ * We use the perf_cpu_context::ctx::mutex to serialize against
+ * the hotplug notifiers. See perf_event_{init,exit}_cpu().
+ */
+ struct perf_cpu_context *cpuctx = per_cpu_ptr(&perf_cpu_context, event->cpu);
+
+ if (!cpuctx->online) {
+ err = -ENODEV;
+ goto err_locked;
+ }
}
- /*
- * Look up the group leader (we will attach this event to it):
- */
if (group_leader) {
err = -EINVAL;
* becoming part of another group-sibling):
*/
if (group_leader->group_leader != group_leader)
- goto err_context;
+ goto err_locked;
/* All events in a group should have the same clock */
if (group_leader->clock != event->clock)
- goto err_context;
+ goto err_locked;
/*
* Make sure we're both events for the same CPU;
* you can never concurrently schedule them anyhow.
*/
if (group_leader->cpu != event->cpu)
- goto err_context;
+ goto err_locked;
/*
- * Make sure we're both on the same task, or both
- * per-CPU events.
+ * Make sure we're both on the same context; either task or cpu.
*/
- if (group_leader->ctx->task != ctx->task)
- goto err_context;
-
- /*
- * Do not allow to attach to a group in a different task
- * or CPU context. If we're moving SW events, we'll fix
- * this up later, so allow that.
- *
- * Racy, not holding group_leader->ctx->mutex, see comment with
- * perf_event_ctx_lock().
- */
- if (!move_group && group_leader->ctx != ctx)
- goto err_context;
+ if (group_leader->ctx != ctx)
+ goto err_locked;
/*
* Only a group leader can be exclusive or pinned
*/
if (attr.exclusive || attr.pinned)
- goto err_context;
- }
-
- if (output_event) {
- err = perf_event_set_output(event, output_event);
- if (err)
- goto err_context;
- }
-
- event_file = anon_inode_getfile("[perf_event]", &perf_fops, event,
- f_flags);
- if (IS_ERR(event_file)) {
- err = PTR_ERR(event_file);
- event_file = NULL;
- goto err_context;
- }
-
- if (task) {
- err = down_read_interruptible(&task->signal->exec_update_lock);
- if (err)
- goto err_file;
-
- /*
- * We must hold exec_update_lock across this and any potential
- * perf_install_in_context() call for this new event to
- * serialize against exec() altering our credentials (and the
- * perf_event_exit_task() that could imply).
- */
- err = -EACCES;
- if (!perf_check_permission(&attr, task))
- goto err_cred;
- }
-
- if (move_group) {
- gctx = __perf_event_ctx_lock_double(group_leader, ctx);
-
- if (gctx->task == TASK_TOMBSTONE) {
- err = -ESRCH;
goto err_locked;
- }
- /*
- * Check if we raced against another sys_perf_event_open() call
- * moving the software group underneath us.
- */
- if (!(group_leader->group_caps & PERF_EV_CAP_SOFTWARE)) {
+ if (is_software_event(event) &&
+ !in_software_context(group_leader)) {
/*
- * If someone moved the group out from under us, check
- * if this new event wound up on the same ctx, if so
- * its the regular !move_group case, otherwise fail.
+ * If the event is a sw event, but the group_leader
+ * is on hw context.
+ *
+ * Allow the addition of software events to hw
+ * groups, this is safe because software events
+ * never fail to schedule.
+ *
+ * Note the comment that goes with struct
+ * perf_event_pmu_context.
*/
- if (gctx != ctx) {
- err = -EINVAL;
- goto err_locked;
- } else {
- perf_event_ctx_unlock(group_leader, gctx);
- move_group = 0;
- goto not_move_group;
- }
- }
-
- /*
- * Failure to create exclusive events returns -EBUSY.
- */
- err = -EBUSY;
- if (!exclusive_event_installable(group_leader, ctx))
- goto err_locked;
-
- for_each_sibling_event(sibling, group_leader) {
- if (!exclusive_event_installable(sibling, ctx))
- goto err_locked;
- }
- } else {
- mutex_lock(&ctx->mutex);
-
- /*
- * Now that we hold ctx->lock, (re)validate group_leader->ctx == ctx,
- * see the group_leader && !move_group test earlier.
- */
- if (group_leader && group_leader->ctx != ctx) {
- err = -EINVAL;
- goto err_locked;
+ pmu = group_leader->pmu_ctx->pmu;
+ } else if (!is_software_event(event) &&
+ is_software_event(group_leader) &&
+ (group_leader->group_caps & PERF_EV_CAP_SOFTWARE)) {
+ /*
+ * In case the group is a pure software group, and we
+ * try to add a hardware event, move the whole group to
+ * the hardware context.
+ */
+ move_group = 1;
}
}
-not_move_group:
- if (ctx->task == TASK_TOMBSTONE) {
- err = -ESRCH;
+ /*
+ * Now that we're certain of the pmu; find the pmu_ctx.
+ */
+ pmu_ctx = find_get_pmu_context(pmu, ctx, event);
+ if (IS_ERR(pmu_ctx)) {
+ err = PTR_ERR(pmu_ctx);
goto err_locked;
}
+ event->pmu_ctx = pmu_ctx;
- if (!perf_event_validate_size(event)) {
- err = -E2BIG;
- goto err_locked;
+ if (output_event) {
+ err = perf_event_set_output(event, output_event);
+ if (err)
+ goto err_context;
}
- if (!task) {
- /*
- * Check if the @cpu we're creating an event for is online.
- *
- * We use the perf_cpu_context::ctx::mutex to serialize against
- * the hotplug notifiers. See perf_event_{init,exit}_cpu().
- */
- struct perf_cpu_context *cpuctx =
- container_of(ctx, struct perf_cpu_context, ctx);
-
- if (!cpuctx->online) {
- err = -ENODEV;
- goto err_locked;
- }
+ if (!perf_event_validate_size(event)) {
+ err = -E2BIG;
+ goto err_context;
}
if (perf_need_aux_event(event) && !perf_get_aux_event(event, group_leader)) {
err = -EINVAL;
- goto err_locked;
+ goto err_context;
}
/*
*/
if (!exclusive_event_installable(event, ctx)) {
err = -EBUSY;
- goto err_locked;
+ goto err_context;
}
WARN_ON_ONCE(ctx->parent_ctx);
+ event_file = anon_inode_getfile("[perf_event]", &perf_fops, event, f_flags);
+ if (IS_ERR(event_file)) {
+ err = PTR_ERR(event_file);
+ event_file = NULL;
+ goto err_context;
+ }
+
/*
* This is the point on no return; we cannot fail hereafter. This is
* where we start modifying current state.
*/
if (move_group) {
- /*
- * See perf_event_ctx_lock() for comments on the details
- * of swizzling perf_event::ctx.
- */
perf_remove_from_context(group_leader, 0);
- put_ctx(gctx);
+ put_pmu_ctx(group_leader->pmu_ctx);
for_each_sibling_event(sibling, group_leader) {
perf_remove_from_context(sibling, 0);
- put_ctx(gctx);
+ put_pmu_ctx(sibling->pmu_ctx);
}
/*
- * Wait for everybody to stop referencing the events through
- * the old lists, before installing it on new lists.
- */
- synchronize_rcu();
-
- /*
* Install the group siblings before the group leader.
*
* Because a group leader will try and install the entire group
* reachable through the group lists.
*/
for_each_sibling_event(sibling, group_leader) {
+ sibling->pmu_ctx = pmu_ctx;
+ get_pmu_ctx(pmu_ctx);
perf_event__state_init(sibling);
perf_install_in_context(ctx, sibling, sibling->cpu);
- get_ctx(ctx);
}
/*
* event. What we want here is event in the initial
* startup state, ready to be add into new context.
*/
+ group_leader->pmu_ctx = pmu_ctx;
+ get_pmu_ctx(pmu_ctx);
perf_event__state_init(group_leader);
perf_install_in_context(ctx, group_leader, group_leader->cpu);
- get_ctx(ctx);
}
/*
perf_install_in_context(ctx, event, event->cpu);
perf_unpin_context(ctx);
- if (move_group)
- perf_event_ctx_unlock(group_leader, gctx);
mutex_unlock(&ctx->mutex);
if (task) {
fd_install(event_fd, event_file);
return event_fd;
+err_context:
+ /* event->pmu_ctx freed by free_event() */
err_locked:
- if (move_group)
- perf_event_ctx_unlock(group_leader, gctx);
mutex_unlock(&ctx->mutex);
+ perf_unpin_context(ctx);
+ put_ctx(ctx);
err_cred:
if (task)
up_read(&task->signal->exec_update_lock);
-err_file:
- fput(event_file);
-err_context:
- perf_unpin_context(ctx);
- put_ctx(ctx);
err_alloc:
- /*
- * If event_file is set, the fput() above will have called ->release()
- * and that will take care of freeing the event.
- */
- if (!event_file)
- free_event(event);
+ free_event(event);
err_task:
if (task)
put_task_struct(task);
perf_overflow_handler_t overflow_handler,
void *context)
{
+ struct perf_event_pmu_context *pmu_ctx;
struct perf_event_context *ctx;
struct perf_event *event;
+ struct pmu *pmu;
int err;
/*
/* Mark owner so we could distinguish it from user events. */
event->owner = TASK_TOMBSTONE;
+ pmu = event->pmu;
+
+ if (pmu->task_ctx_nr == perf_sw_context)
+ event->event_caps |= PERF_EV_CAP_SOFTWARE;
/*
* Get the target context (task or percpu):
*/
- ctx = find_get_context(event->pmu, task, event);
+ ctx = find_get_context(task, event);
if (IS_ERR(ctx)) {
err = PTR_ERR(ctx);
- goto err_free;
+ goto err_alloc;
}
WARN_ON_ONCE(ctx->parent_ctx);
goto err_unlock;
}
+ pmu_ctx = find_get_pmu_context(pmu, ctx, event);
+ if (IS_ERR(pmu_ctx)) {
+ err = PTR_ERR(pmu_ctx);
+ goto err_unlock;
+ }
+ event->pmu_ctx = pmu_ctx;
+
if (!task) {
/*
* Check if the @cpu we're creating an event for is online.
container_of(ctx, struct perf_cpu_context, ctx);
if (!cpuctx->online) {
err = -ENODEV;
- goto err_unlock;
+ goto err_pmu_ctx;
}
}
if (!exclusive_event_installable(event, ctx)) {
err = -EBUSY;
- goto err_unlock;
+ goto err_pmu_ctx;
}
perf_install_in_context(ctx, event, event->cpu);
return event;
+err_pmu_ctx:
+ put_pmu_ctx(pmu_ctx);
err_unlock:
mutex_unlock(&ctx->mutex);
perf_unpin_context(ctx);
put_ctx(ctx);
-err_free:
+err_alloc:
free_event(event);
err:
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(perf_event_create_kernel_counter);
-void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu)
+static void __perf_pmu_remove(struct perf_event_context *ctx,
+ int cpu, struct pmu *pmu,
+ struct perf_event_groups *groups,
+ struct list_head *events)
{
- struct perf_event_context *src_ctx;
- struct perf_event_context *dst_ctx;
- struct perf_event *event, *tmp;
- LIST_HEAD(events);
-
- src_ctx = &per_cpu_ptr(pmu->pmu_cpu_context, src_cpu)->ctx;
- dst_ctx = &per_cpu_ptr(pmu->pmu_cpu_context, dst_cpu)->ctx;
+ struct perf_event *event, *sibling;
- /*
- * See perf_event_ctx_lock() for comments on the details
- * of swizzling perf_event::ctx.
- */
- mutex_lock_double(&src_ctx->mutex, &dst_ctx->mutex);
- list_for_each_entry_safe(event, tmp, &src_ctx->event_list,
- event_entry) {
+ perf_event_groups_for_cpu_pmu(event, groups, cpu, pmu) {
perf_remove_from_context(event, 0);
- unaccount_event_cpu(event, src_cpu);
- put_ctx(src_ctx);
- list_add(&event->migrate_entry, &events);
+ unaccount_event_cpu(event, cpu);
+ put_pmu_ctx(event->pmu_ctx);
+ list_add(&event->migrate_entry, events);
+
+ for_each_sibling_event(sibling, event) {
+ perf_remove_from_context(sibling, 0);
+ unaccount_event_cpu(sibling, cpu);
+ put_pmu_ctx(sibling->pmu_ctx);
+ list_add(&sibling->migrate_entry, events);
+ }
}
+}
- /*
- * Wait for the events to quiesce before re-instating them.
- */
- synchronize_rcu();
+static void __perf_pmu_install_event(struct pmu *pmu,
+ struct perf_event_context *ctx,
+ int cpu, struct perf_event *event)
+{
+ struct perf_event_pmu_context *epc;
+
+ event->cpu = cpu;
+ epc = find_get_pmu_context(pmu, ctx, event);
+ event->pmu_ctx = epc;
+
+ if (event->state >= PERF_EVENT_STATE_OFF)
+ event->state = PERF_EVENT_STATE_INACTIVE;
+ account_event_cpu(event, cpu);
+ perf_install_in_context(ctx, event, cpu);
+}
+
+static void __perf_pmu_install(struct perf_event_context *ctx,
+ int cpu, struct pmu *pmu, struct list_head *events)
+{
+ struct perf_event *event, *tmp;
/*
* Re-instate events in 2 passes.
* leader will enable its siblings, even if those are still on the old
* context.
*/
- list_for_each_entry_safe(event, tmp, &events, migrate_entry) {
+ list_for_each_entry_safe(event, tmp, events, migrate_entry) {
if (event->group_leader == event)
continue;
list_del(&event->migrate_entry);
- if (event->state >= PERF_EVENT_STATE_OFF)
- event->state = PERF_EVENT_STATE_INACTIVE;
- account_event_cpu(event, dst_cpu);
- perf_install_in_context(dst_ctx, event, dst_cpu);
- get_ctx(dst_ctx);
+ __perf_pmu_install_event(pmu, ctx, cpu, event);
}
/*
* Once all the siblings are setup properly, install the group leaders
* to make it go.
*/
- list_for_each_entry_safe(event, tmp, &events, migrate_entry) {
+ list_for_each_entry_safe(event, tmp, events, migrate_entry) {
list_del(&event->migrate_entry);
- if (event->state >= PERF_EVENT_STATE_OFF)
- event->state = PERF_EVENT_STATE_INACTIVE;
- account_event_cpu(event, dst_cpu);
- perf_install_in_context(dst_ctx, event, dst_cpu);
- get_ctx(dst_ctx);
+ __perf_pmu_install_event(pmu, ctx, cpu, event);
}
+}
+
+void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu)
+{
+ struct perf_event_context *src_ctx, *dst_ctx;
+ LIST_HEAD(events);
+
+ src_ctx = &per_cpu_ptr(&perf_cpu_context, src_cpu)->ctx;
+ dst_ctx = &per_cpu_ptr(&perf_cpu_context, dst_cpu)->ctx;
+
+ /*
+ * See perf_event_ctx_lock() for comments on the details
+ * of swizzling perf_event::ctx.
+ */
+ mutex_lock_double(&src_ctx->mutex, &dst_ctx->mutex);
+
+ __perf_pmu_remove(src_ctx, src_cpu, pmu, &src_ctx->pinned_groups, &events);
+ __perf_pmu_remove(src_ctx, src_cpu, pmu, &src_ctx->flexible_groups, &events);
+
+ /*
+ * Wait for the events to quiesce before re-instating them.
+ */
+ synchronize_rcu();
+
+ __perf_pmu_install(dst_ctx, dst_cpu, pmu, &events);
+
mutex_unlock(&dst_ctx->mutex);
mutex_unlock(&src_ctx->mutex);
}
perf_event_wakeup(event);
}
-static void perf_event_exit_task_context(struct task_struct *child, int ctxn)
+static void perf_event_exit_task_context(struct task_struct *child)
{
struct perf_event_context *child_ctx, *clone_ctx = NULL;
struct perf_event *child_event, *next;
WARN_ON_ONCE(child != current);
- child_ctx = perf_pin_task_context(child, ctxn);
+ child_ctx = perf_pin_task_context(child);
if (!child_ctx)
return;
* in.
*/
raw_spin_lock_irq(&child_ctx->lock);
- task_ctx_sched_out(__get_cpu_context(child_ctx), child_ctx, EVENT_ALL);
+ task_ctx_sched_out(child_ctx, EVENT_ALL);
/*
* Now that the context is inactive, destroy the task <-> ctx relation
* and mark the context dead.
*/
- RCU_INIT_POINTER(child->perf_event_ctxp[ctxn], NULL);
+ RCU_INIT_POINTER(child->perf_event_ctxp, NULL);
put_ctx(child_ctx); /* cannot be last */
WRITE_ONCE(child_ctx->task, TASK_TOMBSTONE);
put_task_struct(current); /* cannot be last */
void perf_event_exit_task(struct task_struct *child)
{
struct perf_event *event, *tmp;
- int ctxn;
mutex_lock(&child->perf_event_mutex);
list_for_each_entry_safe(event, tmp, &child->perf_event_list,
}
mutex_unlock(&child->perf_event_mutex);
- for_each_task_context_nr(ctxn)
- perf_event_exit_task_context(child, ctxn);
+ perf_event_exit_task_context(child);
/*
* The perf_event_exit_task_context calls perf_event_task
{
struct perf_event_context *ctx;
struct perf_event *event, *tmp;
- int ctxn;
- for_each_task_context_nr(ctxn) {
- ctx = task->perf_event_ctxp[ctxn];
- if (!ctx)
- continue;
+ ctx = rcu_access_pointer(task->perf_event_ctxp);
+ if (!ctx)
+ return;
- mutex_lock(&ctx->mutex);
- raw_spin_lock_irq(&ctx->lock);
- /*
- * Destroy the task <-> ctx relation and mark the context dead.
- *
- * This is important because even though the task hasn't been
- * exposed yet the context has been (through child_list).
- */
- RCU_INIT_POINTER(task->perf_event_ctxp[ctxn], NULL);
- WRITE_ONCE(ctx->task, TASK_TOMBSTONE);
- put_task_struct(task); /* cannot be last */
- raw_spin_unlock_irq(&ctx->lock);
+ mutex_lock(&ctx->mutex);
+ raw_spin_lock_irq(&ctx->lock);
+ /*
+ * Destroy the task <-> ctx relation and mark the context dead.
+ *
+ * This is important because even though the task hasn't been
+ * exposed yet the context has been (through child_list).
+ */
+ RCU_INIT_POINTER(task->perf_event_ctxp, NULL);
+ WRITE_ONCE(ctx->task, TASK_TOMBSTONE);
+ put_task_struct(task); /* cannot be last */
+ raw_spin_unlock_irq(&ctx->lock);
- list_for_each_entry_safe(event, tmp, &ctx->event_list, event_entry)
- perf_free_event(event, ctx);
- mutex_unlock(&ctx->mutex);
+ list_for_each_entry_safe(event, tmp, &ctx->event_list, event_entry)
+ perf_free_event(event, ctx);
- /*
- * perf_event_release_kernel() could've stolen some of our
- * child events and still have them on its free_list. In that
- * case we must wait for these events to have been freed (in
- * particular all their references to this task must've been
- * dropped).
- *
- * Without this copy_process() will unconditionally free this
- * task (irrespective of its reference count) and
- * _free_event()'s put_task_struct(event->hw.target) will be a
- * use-after-free.
- *
- * Wait for all events to drop their context reference.
- */
- wait_var_event(&ctx->refcount, refcount_read(&ctx->refcount) == 1);
- put_ctx(ctx); /* must be last */
- }
+ mutex_unlock(&ctx->mutex);
+
+ /*
+ * perf_event_release_kernel() could've stolen some of our
+ * child events and still have them on its free_list. In that
+ * case we must wait for these events to have been freed (in
+ * particular all their references to this task must've been
+ * dropped).
+ *
+ * Without this copy_process() will unconditionally free this
+ * task (irrespective of its reference count) and
+ * _free_event()'s put_task_struct(event->hw.target) will be a
+ * use-after-free.
+ *
+ * Wait for all events to drop their context reference.
+ */
+ wait_var_event(&ctx->refcount, refcount_read(&ctx->refcount) == 1);
+ put_ctx(ctx); /* must be last */
}
void perf_event_delayed_put(struct task_struct *task)
{
- int ctxn;
-
- for_each_task_context_nr(ctxn)
- WARN_ON_ONCE(task->perf_event_ctxp[ctxn]);
+ WARN_ON_ONCE(task->perf_event_ctxp);
}
struct file *perf_event_get(unsigned int fd)
struct perf_event_context *child_ctx)
{
enum perf_event_state parent_state = parent_event->state;
+ struct perf_event_pmu_context *pmu_ctx;
struct perf_event *child_event;
unsigned long flags;
if (IS_ERR(child_event))
return child_event;
-
- if ((child_event->attach_state & PERF_ATTACH_TASK_DATA) &&
- !child_ctx->task_ctx_data) {
- struct pmu *pmu = child_event->pmu;
-
- child_ctx->task_ctx_data = alloc_task_ctx_data(pmu);
- if (!child_ctx->task_ctx_data) {
- free_event(child_event);
- return ERR_PTR(-ENOMEM);
- }
+ pmu_ctx = find_get_pmu_context(child_event->pmu, child_ctx, child_event);
+ if (!pmu_ctx) {
+ free_event(child_event);
+ return NULL;
}
+ child_event->pmu_ctx = pmu_ctx;
/*
* is_orphaned_event() and list_add_tail(&parent_event->child_list)
static int
inherit_task_group(struct perf_event *event, struct task_struct *parent,
struct perf_event_context *parent_ctx,
- struct task_struct *child, int ctxn,
+ struct task_struct *child,
u64 clone_flags, int *inherited_all)
{
- int ret;
struct perf_event_context *child_ctx;
+ int ret;
if (!event->attr.inherit ||
(event->attr.inherit_thread && !(clone_flags & CLONE_THREAD)) ||
return 0;
}
- child_ctx = child->perf_event_ctxp[ctxn];
+ child_ctx = child->perf_event_ctxp;
if (!child_ctx) {
/*
* This is executed from the parent task context, so
* First allocate and initialize a context for the
* child.
*/
- child_ctx = alloc_perf_context(parent_ctx->pmu, child);
+ child_ctx = alloc_perf_context(child);
if (!child_ctx)
return -ENOMEM;
- child->perf_event_ctxp[ctxn] = child_ctx;
+ child->perf_event_ctxp = child_ctx;
}
- ret = inherit_group(event, parent, parent_ctx,
- child, child_ctx);
-
+ ret = inherit_group(event, parent, parent_ctx, child, child_ctx);
if (ret)
*inherited_all = 0;
/*
* Initialize the perf_event context in task_struct
*/
-static int perf_event_init_context(struct task_struct *child, int ctxn,
- u64 clone_flags)
+static int perf_event_init_context(struct task_struct *child, u64 clone_flags)
{
struct perf_event_context *child_ctx, *parent_ctx;
struct perf_event_context *cloned_ctx;
unsigned long flags;
int ret = 0;
- if (likely(!parent->perf_event_ctxp[ctxn]))
+ if (likely(!parent->perf_event_ctxp))
return 0;
/*
* If the parent's context is a clone, pin it so it won't get
* swapped under us.
*/
- parent_ctx = perf_pin_task_context(parent, ctxn);
+ parent_ctx = perf_pin_task_context(parent);
if (!parent_ctx)
return 0;
*/
perf_event_groups_for_each(event, &parent_ctx->pinned_groups) {
ret = inherit_task_group(event, parent, parent_ctx,
- child, ctxn, clone_flags,
- &inherited_all);
+ child, clone_flags, &inherited_all);
if (ret)
goto out_unlock;
}
perf_event_groups_for_each(event, &parent_ctx->flexible_groups) {
ret = inherit_task_group(event, parent, parent_ctx,
- child, ctxn, clone_flags,
- &inherited_all);
+ child, clone_flags, &inherited_all);
if (ret)
goto out_unlock;
}
raw_spin_lock_irqsave(&parent_ctx->lock, flags);
parent_ctx->rotate_disable = 0;
- child_ctx = child->perf_event_ctxp[ctxn];
+ child_ctx = child->perf_event_ctxp;
if (child_ctx && inherited_all) {
/*
*/
int perf_event_init_task(struct task_struct *child, u64 clone_flags)
{
- int ctxn, ret;
+ int ret;
- memset(child->perf_event_ctxp, 0, sizeof(child->perf_event_ctxp));
+ child->perf_event_ctxp = NULL;
mutex_init(&child->perf_event_mutex);
INIT_LIST_HEAD(&child->perf_event_list);
- for_each_task_context_nr(ctxn) {
- ret = perf_event_init_context(child, ctxn, clone_flags);
- if (ret) {
- perf_event_free_task(child);
- return ret;
- }
+ ret = perf_event_init_context(child, clone_flags);
+ if (ret) {
+ perf_event_free_task(child);
+ return ret;
}
return 0;
static void __init perf_event_init_all_cpus(void)
{
struct swevent_htable *swhash;
+ struct perf_cpu_context *cpuctx;
int cpu;
zalloc_cpumask_var(&perf_online_mask, GFP_KERNEL);
for_each_possible_cpu(cpu) {
swhash = &per_cpu(swevent_htable, cpu);
mutex_init(&swhash->hlist_mutex);
- INIT_LIST_HEAD(&per_cpu(active_ctx_list, cpu));
INIT_LIST_HEAD(&per_cpu(pmu_sb_events.list, cpu));
raw_spin_lock_init(&per_cpu(pmu_sb_events.lock, cpu));
-#ifdef CONFIG_CGROUP_PERF
- INIT_LIST_HEAD(&per_cpu(cgrp_cpuctx_list, cpu));
-#endif
INIT_LIST_HEAD(&per_cpu(sched_cb_list, cpu));
+
+ cpuctx = per_cpu_ptr(&perf_cpu_context, cpu);
+ __perf_event_init_context(&cpuctx->ctx);
+ lockdep_set_class(&cpuctx->ctx.mutex, &cpuctx_mutex);
+ lockdep_set_class(&cpuctx->ctx.lock, &cpuctx_lock);
+ cpuctx->online = cpumask_test_cpu(cpu, perf_online_mask);
+ cpuctx->heap_size = ARRAY_SIZE(cpuctx->heap_default);
+ cpuctx->heap = cpuctx->heap_default;
}
}
#if defined CONFIG_HOTPLUG_CPU || defined CONFIG_KEXEC_CORE
static void __perf_event_exit_context(void *__info)
{
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
struct perf_event_context *ctx = __info;
- struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
struct perf_event *event;
raw_spin_lock(&ctx->lock);
- ctx_sched_out(ctx, cpuctx, EVENT_TIME);
+ ctx_sched_out(ctx, EVENT_TIME);
list_for_each_entry(event, &ctx->event_list, event_entry)
__perf_remove_from_context(event, cpuctx, ctx, (void *)DETACH_GROUP);
raw_spin_unlock(&ctx->lock);
{
struct perf_cpu_context *cpuctx;
struct perf_event_context *ctx;
- struct pmu *pmu;
+ // XXX simplify cpuctx->online
mutex_lock(&pmus_lock);
- list_for_each_entry(pmu, &pmus, entry) {
- cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu);
- ctx = &cpuctx->ctx;
+ cpuctx = per_cpu_ptr(&perf_cpu_context, cpu);
+ ctx = &cpuctx->ctx;
- mutex_lock(&ctx->mutex);
- smp_call_function_single(cpu, __perf_event_exit_context, ctx, 1);
- cpuctx->online = 0;
- mutex_unlock(&ctx->mutex);
- }
+ mutex_lock(&ctx->mutex);
+ smp_call_function_single(cpu, __perf_event_exit_context, ctx, 1);
+ cpuctx->online = 0;
+ mutex_unlock(&ctx->mutex);
cpumask_clear_cpu(cpu, perf_online_mask);
mutex_unlock(&pmus_lock);
}
{
struct perf_cpu_context *cpuctx;
struct perf_event_context *ctx;
- struct pmu *pmu;
perf_swevent_init_cpu(cpu);
mutex_lock(&pmus_lock);
cpumask_set_cpu(cpu, perf_online_mask);
- list_for_each_entry(pmu, &pmus, entry) {
- cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu);
- ctx = &cpuctx->ctx;
+ cpuctx = per_cpu_ptr(&perf_cpu_context, cpu);
+ ctx = &cpuctx->ctx;
- mutex_lock(&ctx->mutex);
- cpuctx->online = 1;
- mutex_unlock(&ctx->mutex);
- }
+ mutex_lock(&ctx->mutex);
+ cpuctx->online = 1;
+ mutex_unlock(&ctx->mutex);
mutex_unlock(&pmus_lock);
return 0;
static int __perf_cgroup_move(void *info)
{
struct task_struct *task = info;
- rcu_read_lock();
- perf_cgroup_switch(task);
- rcu_read_unlock();
+
+ preempt_disable();
+ if (atomic_read(this_cpu_ptr(&perf_cgroup_events)))
+ perf_cgroup_switch(task);
+ preempt_enable();
+
return 0;
}
projects / platform / kernel / linux-rpi.git / commitdiff