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perf_counter: Optimize perf_swcounter_event()

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Similar to tracepoints, use an enable variable to reduce
overhead when unused.

Only look for a counter of a particular event type when we know
there is at least one in the system.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-06-19 18:27:26 +02:00 • committed by Ingo Molnar
parent 3d906ef10a
commit f29ac756a4
2 changed files with 25 additions and 4 deletions
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11
include/linux/perf_counter.h
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@ -669,7 +669,16 @@ static inline int is_software_counter(struct perf_counter *counter)
(counter->attr.type != PERF_TYPE_HW_CACHE);
}
extern void perf_swcounter_event(u32, u64, int, struct pt_regs *, u64);
extern atomic_t perf_swcounter_enabled[PERF_COUNT_SW_MAX];
extern void __perf_swcounter_event(u32, u64, int, struct pt_regs *, u64);
static inline void
perf_swcounter_event(u32 event, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
{
if (atomic_read(&perf_swcounter_enabled[event]))
__perf_swcounter_event(event, nr, nmi, regs, addr);
}
extern void __perf_counter_mmap(struct vm_area_struct *vma);