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sched: scale sysctl_sched_shares_ratelimit with nr_cpus

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David reported that his Niagra spend a little too much time in
tg_shares_up(), which considering he has a large cpu count makes sense.

So scale the ratelimit value with the number of cpus like we do for
other controls as well.

Reported-by: David Miller <davem@davemloft.net>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2008-08-04 08:54:26 +02:00 committed by Ingo Molnar
parent f1679d0848
commit 55cd53404c
1 changed files with 4 additions and 2 deletions
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6
kernel/sched.c
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@ -808,9 +808,9 @@ const_debug unsigned int sysctl_sched_nr_migrate = 32;
/*
* ratelimit for updating the group shares.
* default: 0.5ms
* default: 0.25ms
*/
const_debug unsigned int sysctl_sched_shares_ratelimit = 500000;
unsigned int sysctl_sched_shares_ratelimit = 250000;
/*
* period over which we measure -rt task cpu usage in us.
@ -5740,6 +5740,8 @@ static inline void sched_init_granularity(void)
sysctl_sched_latency = limit;
sysctl_sched_wakeup_granularity *= factor;
sysctl_sched_shares_ratelimit *= factor;
}
#ifdef CONFIG_SMP