From 10989fb2451763fae6f42d85fa6106c8fd010cf5 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Mon, 25 May 2009 14:45:28 +0200 Subject: [PATCH] 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: Peter Zijlstra Cc: Paul Mackerras Cc: Corey Ashford Cc: Arnaldo Carvalho de Melo Cc: John Kacur LKML-Reference: <20090525124600.419025548@chello.nl> Signed-off-by: Ingo Molnar --- kernel/perf_counter.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index 7a7a144870e..14b1fe98483 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -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;