From f841b682baef90ee144df8b12e2c76aa460717c1 Mon Sep 17 00:00:00 2001 From: Chengming Zhou Date: Wed, 7 Dec 2022 20:40:23 +0800 Subject: [PATCH] perf/core: Fix cgroup events tracking We encounter perf warnings when using cgroup events like: cd /sys/fs/cgroup mkdir test perf stat -e cycles -a -G test Which then triggers: WARNING: CPU: 0 PID: 690 at kernel/events/core.c:849 perf_cgroup_switch+0xb2/0xc0 Call Trace: __schedule+0x4ae/0x9f0 ? _raw_spin_unlock_irqrestore+0x23/0x40 ? __cond_resched+0x18/0x20 preempt_schedule_common+0x2d/0x70 __cond_resched+0x18/0x20 wait_for_completion+0x2f/0x160 ? cpu_stop_queue_work+0x9e/0x130 affine_move_task+0x18a/0x4f0 WARNING: CPU: 0 PID: 690 at kernel/events/core.c:829 ctx_sched_in+0x1cf/0x1e0 Call Trace: ? ctx_sched_out+0xb7/0x1b0 perf_cgroup_switch+0x88/0xc0 __schedule+0x4ae/0x9f0 ? _raw_spin_unlock_irqrestore+0x23/0x40 ? __cond_resched+0x18/0x20 preempt_schedule_common+0x2d/0x70 __cond_resched+0x18/0x20 wait_for_completion+0x2f/0x160 ? cpu_stop_queue_work+0x9e/0x130 affine_move_task+0x18a/0x4f0 The above two warnings are not complete here since I remove other unimportant information. The problem is caused by the perf cgroup events tracking: CPU0 CPU1 perf_event_open() perf_event_alloc() account_event() account_event_cpu() atomic_inc(perf_cgroup_events) __perf_event_task_sched_out() if (atomic_read(perf_cgroup_events)) perf_cgroup_switch() // kernel/events/core.c:849 WARN_ON_ONCE(cpuctx->ctx.nr_cgroups == 0) if (READ_ONCE(cpuctx->cgrp) == cgrp) // false return perf_ctx_lock() ctx_sched_out() cpuctx->cgrp = cgrp ctx_sched_in() perf_cgroup_set_timestamp() // kernel/events/core.c:829 WARN_ON_ONCE(!ctx->nr_cgroups) perf_ctx_unlock() perf_install_in_context() cpu_function_call() __perf_install_in_context() add_event_to_ctx() list_add_event() perf_cgroup_event_enable() ctx->nr_cgroups++ cpuctx->cgrp = X We can see from above that we wrongly use percpu atomic perf_cgroup_events to check if we need to perf_cgroup_switch(), which should only be used when we know this CPU has cgroup events enabled. The commit bd2756811766 ("perf: Rewrite core context handling") change to have only one context per-CPU, so we can just use cpuctx->cgrp to check if this CPU has cgroup events enabled. So percpu atomic perf_cgroup_events is not needed. Fixes: bd2756811766 ("perf: Rewrite core context handling") Signed-off-by: Chengming Zhou Signed-off-by: Peter Zijlstra (Intel) Tested-by: Ravi Bangoria Link: https://lkml.kernel.org/r/20221207124023.66252-1-zhouchengming@bytedance.com --- kernel/events/core.c | 42 ++++++++++-------------------------------- 1 file changed, 10 insertions(+), 32 deletions(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 4bd2434..37c0f04 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -380,7 +380,6 @@ enum event_type_t { /* * perf_sched_events : >0 events exist - * perf_cgroup_events: >0 per-cpu cgroup events exist on this cpu */ static void perf_sched_delayed(struct work_struct *work); @@ -389,7 +388,6 @@ static DECLARE_DELAYED_WORK(perf_sched_work, perf_sched_delayed); static DEFINE_MUTEX(perf_sched_mutex); static atomic_t perf_sched_count; -static DEFINE_PER_CPU(atomic_t, perf_cgroup_events); static DEFINE_PER_CPU(struct pmu_event_list, pmu_sb_events); static atomic_t nr_mmap_events __read_mostly; @@ -844,9 +842,16 @@ static void perf_cgroup_switch(struct task_struct *task) struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context); struct perf_cgroup *cgrp; - cgrp = perf_cgroup_from_task(task, NULL); + /* + * cpuctx->cgrp is set when the first cgroup event enabled, + * and is cleared when the last cgroup event disabled. + */ + if (READ_ONCE(cpuctx->cgrp) == NULL) + return; WARN_ON_ONCE(cpuctx->ctx.nr_cgroups == 0); + + cgrp = perf_cgroup_from_task(task, NULL); if (READ_ONCE(cpuctx->cgrp) == cgrp) return; @@ -3631,8 +3636,7 @@ void __perf_event_task_sched_out(struct task_struct *task, * to check if we have to switch out PMU state. * cgroup event are system-wide mode only */ - if (atomic_read(this_cpu_ptr(&perf_cgroup_events))) - perf_cgroup_switch(next); + perf_cgroup_switch(next); } static bool perf_less_group_idx(const void *l, const void *r) @@ -4974,15 +4978,6 @@ static void unaccount_pmu_sb_event(struct perf_event *event) detach_sb_event(event); } -static void unaccount_event_cpu(struct perf_event *event, int cpu) -{ - if (event->parent) - return; - - if (is_cgroup_event(event)) - atomic_dec(&per_cpu(perf_cgroup_events, cpu)); -} - #ifdef CONFIG_NO_HZ_FULL static DEFINE_SPINLOCK(nr_freq_lock); #endif @@ -5048,8 +5043,6 @@ static void unaccount_event(struct perf_event *event) schedule_delayed_work(&perf_sched_work, HZ); } - unaccount_event_cpu(event, event->cpu); - unaccount_pmu_sb_event(event); } @@ -11679,15 +11672,6 @@ static void account_pmu_sb_event(struct perf_event *event) attach_sb_event(event); } -static void account_event_cpu(struct perf_event *event, int cpu) -{ - if (event->parent) - return; - - if (is_cgroup_event(event)) - atomic_inc(&per_cpu(perf_cgroup_events, cpu)); -} - /* Freq events need the tick to stay alive (see perf_event_task_tick). */ static void account_freq_event_nohz(void) { @@ -11775,8 +11759,6 @@ static void account_event(struct perf_event *event) } enabled: - account_event_cpu(event, event->cpu); - account_pmu_sb_event(event); } @@ -12822,13 +12804,11 @@ static void __perf_pmu_remove(struct perf_event_context *ctx, perf_event_groups_for_cpu_pmu(event, groups, cpu, pmu) { perf_remove_from_context(event, 0); - 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); } @@ -12847,7 +12827,6 @@ static void __perf_pmu_install_event(struct pmu *pmu, 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); } @@ -13742,8 +13721,7 @@ static int __perf_cgroup_move(void *info) struct task_struct *task = info; preempt_disable(); - if (atomic_read(this_cpu_ptr(&perf_cgroup_events))) - perf_cgroup_switch(task); + perf_cgroup_switch(task); preempt_enable(); return 0; -- 2.7.4