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sched, block: Unify cache detection

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The block layer has some code trying to determine if two CPUs share a
cache, the scheduler has a similar function. Expose the function used
by the scheduler and make the block layer use it, thereby removing the
block layers usage of CONFIG_SCHED* and topology bits.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Jens Axboe <axboe@kernel.dk>
Link: http://lkml.kernel.org/r/1327579450.2446.95.camel@twins
This commit is contained in:
Peter Zijlstra
2012-01-26 12:44:34 +01:00
committed by Ingo Molnar
parent cb297a3e43
commit 39be350127
4 changed files with 19 additions and 27 deletions
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16
block/blk.h
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@@ -164,22 +164,6 @@ static inline int queue_congestion_off_threshold(struct request_queue *q)
return q->nr_congestion_off;
}
static inline int blk_cpu_to_group(int cpu)
{
int group = NR_CPUS;
#ifdef CONFIG_SCHED_MC
const struct cpumask *mask = cpu_coregroup_mask(cpu);
group = cpumask_first(mask);
#elif defined(CONFIG_SCHED_SMT)
group = cpumask_first(topology_thread_cpumask(cpu));
#else
return cpu;
#endif
if (likely(group < NR_CPUS))
return group;
return cpu;
}
/*
* Contribute to IO statistics IFF:
*