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sched/core: Ensure load_balance() respects the active_mask 

While load_balance() masks the source CPUs against active_mask, it had
a hole against the destination CPU. Ensure the destination CPU is also
part of the 'domain-mask & active-mask' set.

Reported-by: Levin, Alexander (Sasha Levin) <alexander.levin@verizon.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 77d1dfda0e ("sched/topology, cpuset: Avoid spurious/wrong domain rebuilds")
Signed-off-by: Ingo Molnar <mingo@kernel.org>
zero-colors
Peter Zijlstra 2017-10-09 10:36:53 +02:00 committed by Ingo Molnar
parent f2cdd9cc6c
commit 024c9d2fae
1 changed files with 7 additions and 0 deletions
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7
kernel/sched/fair.c
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@ -8042,6 +8042,13 @@ static int should_we_balance(struct lb_env *env)
struct sched_group *sg = env->sd->groups;
int cpu, balance_cpu = -1;
/*
* Ensure the balancing environment is consistent; can happen
* when the softirq triggers 'during' hotplug.
*/
if (!cpumask_test_cpu(env->dst_cpu, env->cpus))
return 0;
/*
* In the newly idle case, we will allow all the cpu's
* to do the newly idle load balance.