Commit 10989fb2 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

perf_counter: Fix PERF_COUNTER_CONTEXT_SWITCHES for cpu counters 



Ingo noticed that cpu counters had 0 context switches, even though
there was plenty scheduling on the cpu.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <20090525124600.419025548@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 6ab423e0

kernel/perf_counter.c

+3 −4
Original line number Diff line number Diff line
@@ -924,14 +924,13 @@ void perf_counter_task_sched_out(struct task_struct *task, 
	struct perf_counter_context *next_ctx;

	struct pt_regs *regs;



	regs = task_pt_regs(task);

	perf_swcounter_event(PERF_COUNT_CONTEXT_SWITCHES, 1, 1, regs, 0);



	if (likely(!ctx || !cpuctx->task_ctx))

		return;



	update_context_time(ctx);



	regs = task_pt_regs(task);

	perf_swcounter_event(PERF_COUNT_CONTEXT_SWITCHES, 1, 1, regs, 0);



	next_ctx = next->perf_counter_ctxp;

	if (next_ctx && context_equiv(ctx, next_ctx)) {

		task->perf_counter_ctxp = next_ctx;