sched/fair: Rewrite group_imb trigger

Change the group_imb detection from the old 'load-spike' detector to
an actual imbalance detector. We set it from the lower domain balance
pass when it fails to create a balance in the presence of task
affinities.

The advantage is that this should no longer generate the false
positive group_imb conditions generated by transient load spikes from
the normal balancing/bulk-wakeup etc. behaviour.

While I haven't actually observed those they could happen.

I'm not entirely happy with this patch; it somehow feels a little
fragile.

Nor does it solve the biggest issue I have with the group_imb code; it
it still a fragile construct in that once we 'fixed' the imbalance
we'll not detect the group_imb again and could end up re-creating it.

That said, this patch does seem to preserve behaviour for the
described degenerate case. In particular on my 2*6*2 wsm-ep:

  taskset -c 3-11 bash -c 'for ((i=0;i<9;i++)) do while :; do :; done & done'

ends up with 9 spinners, each on their own CPU; whereas if you disable
the group_imb code that typically doesn't happen (you'll get one pair
sharing a CPU most of the time).

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-36fpbgl39dv4u51b6yz2ypz5@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 11cd136..7325ca7 100644 (file)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3906,7 +3906,8 @@ static unsigned long __read_mostly max_load_balance_interval = HZ/10;
 
 #define LBF_ALL_PINNED 0x01
 #define LBF_NEED_BREAK 0x02
-#define LBF_SOME_PINNED 0x04
+#define LBF_DST_PINNED  0x04
+#define LBF_SOME_PINNED        0x08
 
 struct lb_env {
        struct sched_domain     *sd;
@@ -3997,6 +3998,8 @@ int can_migrate_task(struct task_struct *p, struct lb_env *env)
 
                schedstat_inc(p, se.statistics.nr_failed_migrations_affine);
 
+               env->flags |= LBF_SOME_PINNED;
+
                /*
                 * Remember if this task can be migrated to any other cpu in
                 * our sched_group. We may want to revisit it if we couldn't
@@ -4005,13 +4008,13 @@ int can_migrate_task(struct task_struct *p, struct lb_env *env)
                 * Also avoid computing new_dst_cpu if we have already computed
                 * one in current iteration.
                 */
-               if (!env->dst_grpmask || (env->flags & LBF_SOME_PINNED))
+               if (!env->dst_grpmask || (env->flags & LBF_DST_PINNED))
                        return 0;
 
                /* Prevent to re-select dst_cpu via env's cpus */
                for_each_cpu_and(cpu, env->dst_grpmask, env->cpus) {
                        if (cpumask_test_cpu(cpu, tsk_cpus_allowed(p))) {
-                               env->flags |= LBF_SOME_PINNED;
+                               env->flags |= LBF_DST_PINNED;
                                env->new_dst_cpu = cpu;
                                break;
                        }
@@ -4526,13 +4529,12 @@ fix_small_capacity(struct sched_domain *sd, struct sched_group *group)
  * cpu 3 and leave one of the cpus in the second group unused.
  *
  * The current solution to this issue is detecting the skew in the first group
- * by noticing it has a cpu that is overloaded while the remaining cpus are
- * idle -- or rather, there's a distinct imbalance in the cpus; see
- * sg_imbalanced().
+ * by noticing the lower domain failed to reach balance and had difficulty
+ * moving tasks due to affinity constraints.
  *
  * When this is so detected; this group becomes a candidate for busiest; see
  * update_sd_pick_busiest(). And calculcate_imbalance() and
- * find_busiest_group() avoid some of the usual balance conditional to allow it
+ * find_busiest_group() avoid some of the usual balance conditions to allow it
  * to create an effective group imbalance.
  *
  * This is a somewhat tricky proposition since the next run might not find the
@@ -4540,49 +4542,9 @@ fix_small_capacity(struct sched_domain *sd, struct sched_group *group)
  * subtle and fragile situation.
  */
 
-struct sg_imb_stats {
-       unsigned long max_nr_running, min_nr_running;
-       unsigned long max_cpu_load, min_cpu_load;
-};
-
-static inline void init_sg_imb_stats(struct sg_imb_stats *sgi)
-{
-       sgi->max_cpu_load = sgi->max_nr_running = 0UL;
-       sgi->min_cpu_load = sgi->min_nr_running = ~0UL;
-}
-
-static inline void
-update_sg_imb_stats(struct sg_imb_stats *sgi,
-                   unsigned long load, unsigned long nr_running)
-{
-       if (load > sgi->max_cpu_load)
-               sgi->max_cpu_load = load;
-       if (sgi->min_cpu_load > load)
-               sgi->min_cpu_load = load;
-
-       if (nr_running > sgi->max_nr_running)
-               sgi->max_nr_running = nr_running;
-       if (sgi->min_nr_running > nr_running)
-               sgi->min_nr_running = nr_running;
-}
-
-static inline int
-sg_imbalanced(struct sg_lb_stats *sgs, struct sg_imb_stats *sgi)
+static inline int sg_imbalanced(struct sched_group *group)
 {
-       /*
-        * Consider the group unbalanced when the imbalance is larger
-        * than the average weight of a task.
-        *
-        * APZ: with cgroup the avg task weight can vary wildly and
-        *      might not be a suitable number - should we keep a
-        *      normalized nr_running number somewhere that negates
-        *      the hierarchy?
-        */
-       if ((sgi->max_cpu_load - sgi->min_cpu_load) >= sgs->load_per_task &&
-           (sgi->max_nr_running - sgi->min_nr_running) > 1)
-               return 1;
-
-       return 0;
+       return group->sgp->imbalance;
 }
 
 /**
@@ -4597,25 +4559,20 @@ static inline void update_sg_lb_stats(struct lb_env *env,
                        struct sched_group *group, int load_idx,
                        int local_group, struct sg_lb_stats *sgs)
 {
-       struct sg_imb_stats sgi;
        unsigned long nr_running;
        unsigned long load;
        int i;
 
-       init_sg_imb_stats(&sgi);
-
        for_each_cpu_and(i, sched_group_cpus(group), env->cpus) {
                struct rq *rq = cpu_rq(i);
 
                nr_running = rq->nr_running;
 
                /* Bias balancing toward cpus of our domain */
-               if (local_group) {
+               if (local_group)
                        load = target_load(i, load_idx);
-               } else {
+               else
                        load = source_load(i, load_idx);
-                       update_sg_imb_stats(&sgi, load, nr_running);
-               }
 
                sgs->group_load += load;
                sgs->sum_nr_running += nr_running;
@@ -4635,7 +4592,7 @@ static inline void update_sg_lb_stats(struct lb_env *env,
        if (sgs->sum_nr_running)
                sgs->load_per_task = sgs->sum_weighted_load / sgs->sum_nr_running;
 
-       sgs->group_imb = sg_imbalanced(sgs, &sgi);
+       sgs->group_imb = sg_imbalanced(group);
 
        sgs->group_capacity =
                DIV_ROUND_CLOSEST(sgs->group_power, SCHED_POWER_SCALE);
@@ -5163,6 +5120,7 @@ static int load_balance(int this_cpu, struct rq *this_rq,
                        int *continue_balancing)
 {
        int ld_moved, cur_ld_moved, active_balance = 0;
+       struct sched_domain *sd_parent = sd->parent;
        struct sched_group *group;
        struct rq *busiest;
        unsigned long flags;
@@ -5267,11 +5225,11 @@ more_balance:
                 * moreover subsequent load balance cycles should correct the
                 * excess load moved.
                 */
-               if ((env.flags & LBF_SOME_PINNED) && env.imbalance > 0) {
+               if ((env.flags & LBF_DST_PINNED) && env.imbalance > 0) {
 
                        env.dst_rq       = cpu_rq(env.new_dst_cpu);
                        env.dst_cpu      = env.new_dst_cpu;
-                       env.flags       &= ~LBF_SOME_PINNED;
+                       env.flags       &= ~LBF_DST_PINNED;
                        env.loop         = 0;
                        env.loop_break   = sched_nr_migrate_break;
 
@@ -5285,6 +5243,18 @@ more_balance:
                        goto more_balance;
                }
 
+               /*
+                * We failed to reach balance because of affinity.
+                */
+               if (sd_parent) {
+                       int *group_imbalance = &sd_parent->groups->sgp->imbalance;
+
+                       if ((env.flags & LBF_SOME_PINNED) && env.imbalance > 0) {
+                               *group_imbalance = 1;
+                       } else if (*group_imbalance)
+                               *group_imbalance = 0;
+               }
+
                /* All tasks on this runqueue were pinned by CPU affinity */
                if (unlikely(env.flags & LBF_ALL_PINNED)) {
                        cpumask_clear_cpu(cpu_of(busiest), cpus);
@@ -5688,7 +5658,7 @@ static void rebalance_domains(int cpu, enum cpu_idle_type idle)
                if (time_after_eq(jiffies, sd->last_balance + interval)) {
                        if (load_balance(cpu, rq, sd, idle, &continue_balancing)) {
                                /*
-                                * The LBF_SOME_PINNED logic could have changed
+                                * The LBF_DST_PINNED logic could have changed
                                 * env->dst_cpu, so we can't know our idle
                                 * state even if we migrated tasks. Update it.
                                 */

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index b3c5653..0d7544c 100644 (file)
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -605,6 +605,7 @@ struct sched_group_power {
         */
        unsigned int power, power_orig;
        unsigned long next_update;
+       int imbalance; /* XXX unrelated to power but shared group state */
        /*
         * Number of busy cpus in this group.
         */