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sched: Add smt_gain

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The idea is that multi-threading a core yields more work
capacity than a single thread, provide a way to express a
static gain for threads.

Signed-off-by: Peter Zijlstra <[email protected]>
Tested-by: Andreas Herrmann <[email protected]>
Acked-by: Andreas Herrmann <[email protected]>
Acked-by: Gautham R Shenoy <[email protected]>
Cc: Balbir Singh <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Peter Zijlstra 2009-09-01 10:34:35 +02:00 • committed by Ingo Molnar
commit a52bfd7358
3 changed files with 9 additions and 1 deletions
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8
kernel/sched.c
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@ -8523,9 +8523,15 @@ static void init_sched_groups_power(int cpu, struct sched_domain *sd)
weight = cpumask_weight(sched_domain_span(sd));
/*
* SMT siblings share the power of a single core.
* Usually multiple threads get a better yield out of
* that one core than a single thread would have,
* reflect that in sd->smt_gain.
*/
if ((sd->flags & SD_SHARE_CPUPOWER) && weight > 1)
if ((sd->flags & SD_SHARE_CPUPOWER) && weight > 1) {
power *= sd->smt_gain;
power /= weight;
power >>= SCHED_LOAD_SHIFT;
}
sg_inc_cpu_power(sd->groups, power);
return;
}