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sched/balancing: Prevent the reselection of a previous env.dst_cpu if some tasks are pinned 

Currently new_dst_cpu is prevented from being reselected actually, not
dst_cpu. This can result in attempting to pull tasks to this_cpu twice.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/281f59b6e596c718dd565ad267fc38f5b8e5c995.1379265590.git.vdavydov@parallels.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Vladimir Davydov 2013-09-15 21:30:13 +04:00 committed by Ingo Molnar
parent 40a0c68ca9
commit 7aff2e3a56
1 changed files with 3 additions and 3 deletions
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6
kernel/sched/fair.c
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@ -5261,15 +5261,15 @@ more_balance:
*/
if ((env.flags & LBF_DST_PINNED) && env.imbalance > 0) {
/* Prevent to re-select dst_cpu via env's cpus */
cpumask_clear_cpu(env.dst_cpu, env.cpus);
env.dst_rq = cpu_rq(env.new_dst_cpu);
env.dst_cpu = env.new_dst_cpu;
env.flags &= ~LBF_DST_PINNED;
env.loop = 0;
env.loop_break = sched_nr_migrate_break;
/* Prevent to re-select dst_cpu via env's cpus */
cpumask_clear_cpu(env.dst_cpu, env.cpus);
/*
* Go back to "more_balance" rather than "redo" since we
* need to continue with same src_cpu.