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Commit 7e54a5a0 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
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perf: Optimize sw events 



Acked-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 82cd6def

include/linux/perf_event.h

+11 −9
Original line number Diff line number Diff line
@@ -1012,19 +1012,21 @@ 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;



	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);

extern struct perf_guest_info_callbacks *perf_guest_cbs;

kernel/perf_event.c

+2 −2
Original line number Diff line number Diff line
@@ -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;

	}