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Commit 3436ae12 authored by Sisir Koppaka's avatar Sisir Koppaka Committed by Ingo Molnar
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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: default avatarSisir Koppaka <sisir.koppaka@gmail.com>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <AANLkTikqHWid2Q93F5U5Qw5snJH8C5PXoa7J6=6hYO94@mail.gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent e2495b57

kernel/sched_fair.c

+3 −2
Original line number Diff line number Diff line
@@ -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;