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perf: Optimize sw events

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Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2010-10-14 22:32:45 +02:00 committed by Ingo Molnar
parent 82cd6def98
commit 7e54a5a0b6
2 changed files with 12 additions and 10 deletions
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18
include/linux/perf_event.h
View file

@ -1012,18 +1012,20 @@ static inline void perf_fetch_caller_regs(struct pt_regs *regs)
perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
}
static inline void
static __always_inline void
perf_sw_event(u32 event_id, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
{
if (atomic_read(&perf_swevent_enabled[event_id])) {
struct pt_regs hot_regs;
struct pt_regs hot_regs;
if (!regs) {
perf_fetch_caller_regs(&hot_regs);
regs = &hot_regs;
}
__perf_sw_event(event_id, nr, nmi, regs, addr);
JUMP_LABEL(&perf_swevent_enabled[event_id], have_event);
return;
have_event:
if (!regs) {
perf_fetch_caller_regs(&hot_regs);
regs = &hot_regs;
}
__perf_sw_event(event_id, nr, nmi, regs, addr);
}
extern void perf_event_mmap(struct vm_area_struct *vma);

4
kernel/perf_event.c
View file

@ -4669,7 +4669,7 @@ static void sw_perf_event_destroy(struct perf_event *event)
WARN_ON(event->parent);
atomic_dec(&perf_swevent_enabled[event_id]);
jump_label_dec(&perf_swevent_enabled[event_id]);
swevent_hlist_put(event);
}
@ -4699,7 +4699,7 @@ static int perf_swevent_init(struct perf_event *event)
if (err)
return err;
atomic_inc(&perf_swevent_enabled[event_id]);
jump_label_inc(&perf_swevent_enabled[event_id]);
event->destroy = sw_perf_event_destroy;
}