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| author | Sisir Koppaka <sisir.koppaka@gmail.com> | 2011-03-26 18:22:55 +0530 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-03-31 13:00:37 +0200 |
| commit | 3436ae1298cb22d722a6520fc97f112dd767a9e1 (patch) | |
| tree | ba05a2b0a80157f9eb19e34b0ac54b9dd279600b | |
| parent | e2495b577324938f0209b4f895c5f205c7e47854 (diff) | |
| download | op-kernel-dev-3436ae1298cb22d722a6520fc97f112dd767a9e1.zip op-kernel-dev-3436ae1298cb22d722a6520fc97f112dd767a9e1.tar.gz | |
sched: Fix rebalance interval calculation
The interval for checking scheduling domains if they are due to be
balanced currently depends on boot state NR_CPUS, which may not
accurately reflect the number of online CPUs at the time of check.
Thus replace NR_CPUS with num_online_cpus().
(ed: Should only affect those who set NR_CPUS really high, such as 4096
or so :-)
Signed-off-by: Sisir Koppaka <sisir.koppaka@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <AANLkTikqHWid2Q93F5U5Qw5snJH8C5PXoa7J6=6hYO94@mail.gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | kernel/sched_fair.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 3f7ec9e..c7ec5c8 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -22,6 +22,7 @@ #include <linux/latencytop.h> #include <linux/sched.h> +#include <linux/cpumask.h> /* * Targeted preemption latency for CPU-bound tasks: @@ -3850,8 +3851,8 @@ static void rebalance_domains(int cpu, enum cpu_idle_type idle) interval = msecs_to_jiffies(interval); if (unlikely(!interval)) interval = 1; - if (interval > HZ*NR_CPUS/10) - interval = HZ*NR_CPUS/10; + if (interval > HZ*num_online_cpus()/10) + interval = HZ*num_online_cpus()/10; need_serialize = sd->flags & SD_SERIALIZE; |
