perf: Optimize sw events
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>
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 7f0e7f5..3b80cbf 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1012,18 +1012,20 @@
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);