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sched: Make tunable scaling style configurable

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As scaling now takes place on all kind of cpu add/remove events a user
that configures values via proc should be able to configure if his set
values are still rescaled or kept whatever happens.

As the comments state that log2 was just a second guess that worked the
interface is not just designed for on/off, but to choose a scaling type.
Currently this allows none, log and linear, but more important it allwos
us to keep the interface even if someone has an even better idea how to
scale the values.

Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1259579808-11357-3-git-send-email-ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Christian Ehrhardt
2009-11-30 12:16:47 +01:00
committed by Ingo Molnar
parent 0bcdcf28c9
commit 1983a922a1
5 changed files with 61 additions and 2 deletions
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15
kernel/sched.c
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@@ -7033,7 +7033,20 @@ cpumask_var_t nohz_cpu_mask;
static void update_sysctl(void)
{
unsigned int cpus = min(num_online_cpus(), 8U);
unsigned int factor = 1 + ilog2(cpus);
unsigned int factor;
switch (sysctl_sched_tunable_scaling) {
case SCHED_TUNABLESCALING_NONE:
factor = 1;
break;
case SCHED_TUNABLESCALING_LINEAR:
factor = cpus;
break;
case SCHED_TUNABLESCALING_LOG:
default:
factor = 1 + ilog2(cpus);
break;
}
#define SET_SYSCTL(name) \
(sysctl_##name = (factor) * normalized_sysctl_##name)