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| author | Oleg Nesterov <oleg@redhat.com> | 2015-10-10 20:53:15 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-10-20 10:25:57 +0200 |
| commit | e73e85f0593832aa583b252f9a16cf90ed6d30fa (patch) | |
| tree | 596a71d44863ae338b5dc1bd07b733e5acc6afec /kernel/sched/core.c | |
| parent | 62694cd51322262a9142e946915fc4783113ccff (diff) | |
| download | linux-e73e85f0593832aa583b252f9a16cf90ed6d30fa.tar.gz linux-e73e85f0593832aa583b252f9a16cf90ed6d30fa.tar.bz2 linux-e73e85f0593832aa583b252f9a16cf90ed6d30fa.zip | |
sched: Don't scan all-offline ->cpus_allowed twice if !CONFIG_CPUSETS
If CONFIG_CPUSETS=n then "case cpuset" changes the state and runs
the already failed for_each_cpu() loop again for no reason.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: heiko.carstens@de.ibm.com
Link: http://lkml.kernel.org/r/20151010185315.GA24100@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/core.c')
| -rw-r--r-- | kernel/sched/core.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index a7b368e51f69..b4d263db52a6 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1580,13 +1580,15 @@ static int select_fallback_rq(int cpu, struct task_struct *p) goto out; } + /* No more Mr. Nice Guy. */ switch (state) { case cpuset: - /* No more Mr. Nice Guy. */ - cpuset_cpus_allowed_fallback(p); - state = possible; - break; - + if (IS_ENABLED(CONFIG_CPUSETS)) { + cpuset_cpus_allowed_fallback(p); + state = possible; + break; + } + /* fall-through */ case possible: do_set_cpus_allowed(p, cpu_possible_mask); state = fail; |