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sched: Don't scan all-offline ->cpus_allowed twice if !CONFIG_CPUSETS

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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>
This commit is contained in:
Oleg Nesterov 2015-10-10 20:53:15 +02:00 committed by Ingo Molnar
parent 62694cd513
commit e73e85f059
1 changed files with 7 additions and 5 deletions
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12
kernel/sched/core.c
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@ -1580,13 +1580,15 @@ static int select_fallback_rq(int cpu, struct task_struct *p)
goto out; goto out;
} }
/* No more Mr. Nice Guy. */
switch (state) { switch (state) {
case cpuset: case cpuset:
/* No more Mr. Nice Guy. */ if (IS_ENABLED(CONFIG_CPUSETS)) {
cpuset_cpus_allowed_fallback(p); cpuset_cpus_allowed_fallback(p);
state = possible; state = possible;
break; break;
}
/* fall-through */
case possible: case possible:
do_set_cpus_allowed(p, cpu_possible_mask); do_set_cpus_allowed(p, cpu_possible_mask);
state = fail; state = fail;