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authorSisir Koppaka <sisir.koppaka@gmail.com>2011-03-26 18:22:55 +0530
committerIngo Molnar <mingo@elte.hu>2011-03-31 13:00:37 +0200
commit3436ae1298cb22d722a6520fc97f112dd767a9e1 (patch)
treeba05a2b0a80157f9eb19e34b0ac54b9dd279600b /kernel
parente2495b577324938f0209b4f895c5f205c7e47854 (diff)
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched_fair.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 3f7ec9e27ee1..c7ec5c8e7b44 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;

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