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sched_clock: Add local_clock() API and improve documentation

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For people who otherwise get to write: cpu_clock(smp_processor_id()),
there is now: local_clock().

Also, as per suggestion from Andrew, provide some documentation on
the various clock interfaces, and minimize the unsigned long long vs
u64 mess.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jens Axboe <jaxboe@fusionio.com>
LKML-Reference: <1275052414.1645.52.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2010-05-25 10:48:51 +02:00
committed by Ingo Molnar
parent 95ae3c59fa
commit c676329abb
8 changed files with 113 additions and 34 deletions
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2
kernel/sched.c
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@@ -1647,7 +1647,7 @@ static void update_shares(struct sched_domain *sd)
if (root_task_group_empty())
return;
now = cpu_clock(raw_smp_processor_id());
now = local_clock();
elapsed = now - sd->last_update;
if (elapsed >= (s64)(u64)sysctl_sched_shares_ratelimit) {