sched: Fix more load-balancing fallout

Commits 367456c756a6 ("sched: Ditch per cgroup task lists for
load-balancing") and 5d6523ebd ("sched: Fix load-balance wreckage")
left some more wreckage.

By setting loop_max unconditionally to ->nr_running load-balancing
could take a lot of time on very long runqueues (hackbench!). So keep
the sysctl as max limit of the amount of tasks we'll iterate.

Furthermore, the min load filter for migration completely fails with
cgroups since inequality in per-cpu state can easily lead to such
small loads :/

Furthermore the change to add new tasks to the tail of the queue
instead of the head seems to have some effect.. not quite sure I
understand why.

Combined these fixes solve the huge hackbench regression reported by
Tim when hackbench is ran in a cgroup.

Reported-by: Tim Chen <tim.c.chen@linux.intel.com>
Acked-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1335365763.28150.267.camel@twins
[ got rid of the CONFIG_PREEMPT tuning and made small readability edits ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0d97ebdc58f078f821a59c29965509a5e47f02f5..e9553640c1c3b679b6ae80b6ff4446b05b486c4b 100644 (file)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -784,7 +784,7 @@ account_entity_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se)
                update_load_add(&rq_of(cfs_rq)->load, se->load.weight);
 #ifdef CONFIG_SMP
        if (entity_is_task(se))
-               list_add_tail(&se->group_node, &rq_of(cfs_rq)->cfs_tasks);
+               list_add(&se->group_node, &rq_of(cfs_rq)->cfs_tasks);
 #endif
        cfs_rq->nr_running++;
 }
@@ -3215,6 +3215,8 @@ static int move_one_task(struct lb_env *env)
 
 static unsigned long task_h_load(struct task_struct *p);
 
+static const unsigned int sched_nr_migrate_break = 32;
+
 /*
  * move_tasks tries to move up to load_move weighted load from busiest to
  * this_rq, as part of a balancing operation within domain "sd".
@@ -3242,7 +3244,7 @@ static int move_tasks(struct lb_env *env)
 
                /* take a breather every nr_migrate tasks */
                if (env->loop > env->loop_break) {
-                       env->loop_break += sysctl_sched_nr_migrate;
+                       env->loop_break += sched_nr_migrate_break;
                        env->flags |= LBF_NEED_BREAK;
                        break;
                }
@@ -3252,7 +3254,7 @@ static int move_tasks(struct lb_env *env)
 
                load = task_h_load(p);
 
-               if (load < 16 && !env->sd->nr_balance_failed)
+               if (sched_feat(LB_MIN) && load < 16 && !env->sd->nr_balance_failed)
                        goto next;
 
                if ((load / 2) > env->load_move)
@@ -4407,7 +4409,7 @@ static int load_balance(int this_cpu, struct rq *this_rq,
                .dst_cpu        = this_cpu,
                .dst_rq         = this_rq,
                .idle           = idle,
-               .loop_break     = sysctl_sched_nr_migrate,
+               .loop_break     = sched_nr_migrate_break,
        };
 
        cpumask_copy(cpus, cpu_active_mask);
@@ -4445,10 +4447,10 @@ redo:
                 * correctly treated as an imbalance.
                 */
                env.flags |= LBF_ALL_PINNED;
-               env.load_move = imbalance;
-               env.src_cpu = busiest->cpu;
-               env.src_rq = busiest;
-               env.loop_max = busiest->nr_running;
+               env.load_move   = imbalance;
+               env.src_cpu     = busiest->cpu;
+               env.src_rq      = busiest;
+               env.loop_max    = min_t(unsigned long, sysctl_sched_nr_migrate, busiest->nr_running);
 
 more_balance:
                local_irq_save(flags);

diff --git a/kernel/sched/features.h b/kernel/sched/features.h
index e61fd73913d0613d7fc66a3f8e7dec5c6a55b58b..de00a486c5c693ac7038fa3c5dd139e642a1c307 100644 (file)
--- a/kernel/sched/features.h
+++ b/kernel/sched/features.h
@@ -68,3 +68,4 @@ SCHED_FEAT(TTWU_QUEUE, true)
 
 SCHED_FEAT(FORCE_SD_OVERLAP, false)
 SCHED_FEAT(RT_RUNTIME_SHARE, true)
+SCHED_FEAT(LB_MIN, false)