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Commit 55cd5340 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
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sched: scale sysctl_sched_shares_ratelimit with nr_cpus 



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: default avatarDavid Miller <davem@davemloft.net>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent f1679d08

kernel/sched.c

+4 −2
Original line number Diff line number Diff line
@@ -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