diff options
| author | Vincent Guittot <vincent.guittot@linaro.org> | 2012-09-13 06:11:26 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-09-13 16:52:03 +0200 |
| commit | 5ed4f1d96deee82ee92cd1ac1e0108c27e80e9b0 (patch) | |
| tree | b147faa700337a1ab47a321f2e35016946b77a16 /kernel/sched | |
| parent | 38b8dd6f87398524d02c21ff614c507ba8c9d295 (diff) | |
| download | linux-5ed4f1d96deee82ee92cd1ac1e0108c27e80e9b0.tar.bz2 | |
sched: Fix nohz_idle_balance()
On tickless systems, one CPU runs load balance for all idle CPUs.
The cpu_load of this CPU is updated before starting the load balance
of each other idle CPUs. We should instead update the cpu_load of
the balance_cpu.
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Venkatesh Pallipadi <venki@google.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/1347509486-8688-1-git-send-email-vincent.guittot@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/fair.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 1ca4fe423528..9ae3a5b68ba4 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4794,14 +4794,15 @@ static void nohz_idle_balance(int this_cpu, enum cpu_idle_type idle) if (need_resched()) break; - raw_spin_lock_irq(&this_rq->lock); - update_rq_clock(this_rq); - update_idle_cpu_load(this_rq); - raw_spin_unlock_irq(&this_rq->lock); + rq = cpu_rq(balance_cpu); + + raw_spin_lock_irq(&rq->lock); + update_rq_clock(rq); + update_idle_cpu_load(rq); + raw_spin_unlock_irq(&rq->lock); rebalance_domains(balance_cpu, CPU_IDLE); - rq = cpu_rq(balance_cpu); if (time_after(this_rq->next_balance, rq->next_balance)) this_rq->next_balance = rq->next_balance; } |