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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 <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Jens Axboe <[email protected]>
LKML-Reference: <1275052414.1645.52.camel@laptop>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Peter Zijlstra 2010-05-25 10:48:51 +02:00 • committed by Ingo Molnar
commit c676329abb
8 changed files with 113 additions and 34 deletions
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4
arch/parisc/kernel/ftrace.c
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@ -82,7 +82,7 @@ unsigned long ftrace_return_to_handler(unsigned long retval0,
unsigned long ret;
pop_return_trace(&trace, &ret);
trace.rettime = cpu_clock(raw_smp_processor_id());
trace.rettime = local_clock();
ftrace_graph_return(&trace);
if (unlikely(!ret)) {
@ -126,7 +126,7 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr)
return;
}
calltime = cpu_clock(raw_smp_processor_id());
calltime = local_clock();
if (push_return_trace(old, calltime,
self_addr, &trace.depth) == -EBUSY) {