Messages in this thread Patch in this message | | | Date | Mon, 25 May 2009 14:45:28 +0200 | From | Peter Zijlstra <> | Subject | [PATCH 5/5] perf_counter: fix PERF_COUNTER_CONTEXT_SWITCHES for cpu counters |
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Ingo noticed that cpu counters had 0 context switches, even though there was plenty scheduling on the cpu.
LKML-Reference: <new-submission> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> --- kernel/perf_counter.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
Index: linux-2.6/kernel/perf_counter.c =================================================================== --- linux-2.6.orig/kernel/perf_counter.c +++ linux-2.6/kernel/perf_counter.c @@ -932,14 +932,13 @@ void perf_counter_task_sched_out(struct 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; --
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