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authorLinus Torvalds <torvalds@linux-foundation.org>2009-02-11 08:24:32 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-02-11 08:24:32 -0800
commit94dba895333a4321f27360e42b807260ae36bda4 (patch)
tree7b6381da7ea9fc176001dda0714725c3a1dd6cc7 /kernel/sched.c
parent9ce04f9238cafcfd09a502f2bc8c13b5f44ec590 (diff)
parent4da94d49b2ecb0a26e716a8811c3ecc542c2a65d (diff)
Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: timers: fix TIMER_ABSTIME for process wide cpu timers timers: split process wide cpu clocks/timers, fix x86: clean up hpet timer reinit timers: split process wide cpu clocks/timers, remove spurious warning timers: split process wide cpu clocks/timers signal: re-add dead task accumulation stats. x86: fix hpet timer reinit for x86_64 sched: fix nohz load balancer on cpu offline
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 8ee437a5ec1..e72485033c4 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)