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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-08-04 08:54:26 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-08-15 18:25:07 +0200 |
| commit | 55cd53404c5cc5fd94708232e3b4aa4a9388917b (patch) | |
| tree | 08a3fe8cf626735bc8cdb96508824c4c49aad265 /kernel/sched.c | |
| parent | f1679d08480008e06fd619c71635ed33274e2595 (diff) | |
| download | lwn-55cd53404c5cc5fd94708232e3b4aa4a9388917b.tar.gz lwn-55cd53404c5cc5fd94708232e3b4aa4a9388917b.zip | |
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: David Miller <davem@davemloft.net>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 8bf8a5528bc7..040807196b33 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -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 |