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| author | Vladimir Davydov <vdavydov@parallels.com> | 2013-09-15 21:30:13 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-09-20 12:02:20 +0200 |
| commit | 7aff2e3a56b724b79fa2d5abd10d8231ef8fb0c5 (patch) | |
| tree | 7b22b4080af51729d1cc3053ac117787111c3ba2 /kernel | |
| parent | 40a0c68ca9b49fb3e7292c1bae035ba5bcb27903 (diff) | |
| download | lwn-7aff2e3a56b724b79fa2d5abd10d8231ef8fb0c5.tar.gz lwn-7aff2e3a56b724b79fa2d5abd10d8231ef8fb0c5.zip | |
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/fair.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 71c6ef58bbb9..0784ab6fcc59 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -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. |