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| author | Ingo Molnar <mingo@elte.hu> | 2009-02-05 13:03:28 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-02-05 13:03:35 +0100 |
| commit | 83895147b702434e6f236deeca75211fd0e3da3a (patch) | |
| tree | 550a8a8828592d9aa110d1851cc52e0f2c95bac7 /kernel/sched.c | |
| parent | x86: fix hpet timer reinit for x86_64 (diff) | |
| parent | sched: fix nohz load balancer on cpu offline (diff) | |
| download | linux-83895147b702434e6f236deeca75211fd0e3da3a.tar.xz linux-83895147b702434e6f236deeca75211fd0e3da3a.zip | |
Merge branch 'sched/urgent' into timers/urgent
Merging it here because an upcoming timers/urgent fix relies on
a change already in sched/urgent and not yet upstream.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 242d0d47a70d..e1fc67d0674c 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -3890,19 +3890,24 @@ int select_nohz_load_balancer(int stop_tick) int cpu = smp_processor_id(); if (stop_tick) { - cpumask_set_cpu(cpu, nohz.cpu_mask); cpu_rq(cpu)->in_nohz_recently = 1; - /* - * If we are going offline and still the leader, give up! - */ - if (!cpu_active(cpu) && - atomic_read(&nohz.load_balancer) == cpu) { + if (!cpu_active(cpu)) { + if (atomic_read(&nohz.load_balancer) != cpu) + return 0; + + /* + * If we are going offline and still the leader, + * give up! + */ if (atomic_cmpxchg(&nohz.load_balancer, cpu, -1) != cpu) BUG(); + return 0; } + cpumask_set_cpu(cpu, nohz.cpu_mask); + /* time for ilb owner also to sleep */ if (cpumask_weight(nohz.cpu_mask) == num_online_cpus()) { if (atomic_read(&nohz.load_balancer) == cpu) |