diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2012-04-25 00:30:36 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-05-09 15:00:53 +0200 |
| commit | 0ce90475dcdbe90affc218e9688c8401e468e84d (patch) | |
| tree | 30771f6a6791af0214c5e7d57958f6395f3b97f5 /kernel/sched/core.c | |
| parent | c22402a2f76e88b04b7a8b6c0597ad9ba6fd71de (diff) | |
sched/fair: Add some serialization to the sched_domain load-balance walk
Since the sched_domain walk is completely unserialized (!SD_SERIALIZE)
it is possible that multiple cpus in the group get elected to do the
next level. Avoid this by adding some serialization.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-vqh9ai6s0ewmeakjz80w4qz6@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/core.c')
| -rw-r--r-- | kernel/sched/core.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 0533a688ce2..6001e5c3b4e 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6060,6 +6060,7 @@ build_overlap_sched_groups(struct sched_domain *sd, int cpu) sg->sgp = *per_cpu_ptr(sdd->sgp, cpumask_first(sg_span)); atomic_inc(&sg->sgp->ref); + sg->balance_cpu = -1; if (cpumask_test_cpu(cpu, sg_span)) groups = sg; @@ -6135,6 +6136,7 @@ build_sched_groups(struct sched_domain *sd, int cpu) cpumask_clear(sched_group_cpus(sg)); sg->sgp->power = 0; + sg->balance_cpu = -1; for_each_cpu(j, span) { if (get_group(j, sdd, NULL) != group) |