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sched,rt: Use cpumask_any*_distribute()

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Replace a bunch of cpumask_any*() instances with
cpumask_any*_distribute(), by injecting this little bit of random in
cpu selection, we reduce the chance two competing balance operations
working off the same lowest_mask pick the same CPU.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Reviewed-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Link: https://lkml.kernel.org/r/20201023102347.190759694@infradead.org
This commit is contained in:
Peter Zijlstra 2020-10-01 15:54:14 +02:00
parent 3015ef4b98
commit 14e292f8d4
4 changed files with 30 additions and 6 deletions
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6
include/linux/cpumask.h
View file

@ -199,6 +199,11 @@ static inline int cpumask_any_and_distribute(const struct cpumask *src1p,
return cpumask_next_and(-1, src1p, src2p);
}
static inline int cpumask_any_distribute(const struct cpumask *srcp)
{
return cpumask_first(srcp);
}
#define for_each_cpu(cpu, mask) \
for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
#define for_each_cpu_not(cpu, mask) \
@ -252,6 +257,7 @@ int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
unsigned int cpumask_local_spread(unsigned int i, int node);
int cpumask_any_and_distribute(const struct cpumask *src1p,
const struct cpumask *src2p);
int cpumask_any_distribute(const struct cpumask *srcp);
/**
* for_each_cpu - iterate over every cpu in a mask