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sched: Fix rebalance interval calculation

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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>
This commit is contained in:
Sisir Koppaka
2011-03-26 18:22:55 +05:30
committed by Ingo Molnar
parent e2495b5773
commit 3436ae1298
1 changed files with 3 additions and 2 deletions
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kernel/sched_fair.c
+3 -2
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@@ -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;