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Message-ID: <49D1C596.5050203@cn.fujitsu.com> Date: Tue, 31 Mar 2009 15:26:14 +0800 From: Zhaolei <zhaolei@...fujitsu.com> To: Steven Rostedt <rostedt@...dmis.org> CC: linux-kernel@...r.kernel.org Subject: [PATCH v2 2/2] ftrace: Clean up enable logic for sched_switch Unify sched_switch and sched_wakeup's action to following logic: Do record_cmdline when start_cmdline_record() called. Trace event when trace is inited and started. Signed-off-by: Zhao Lei <zhaolei@...fujitsu.com> --- kernel/trace/trace_sched_switch.c | 10 +++++----- 1 files changed, 5 insertions(+), 5 deletions(-) diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c index 9117cea..9d8cccd 100644 --- a/kernel/trace/trace_sched_switch.c +++ b/kernel/trace/trace_sched_switch.c @@ -29,13 +29,13 @@ probe_sched_switch(struct rq *__rq, struct task_struct *prev, int cpu; int pc; - if (!sched_ref || sched_stopped) + if (unlikely(!sched_ref)) return; tracing_record_cmdline(prev); tracing_record_cmdline(next); - if (!tracer_enabled) + if (!tracer_enabled || sched_stopped) return; pc = preempt_count(); @@ -56,15 +56,15 @@ probe_sched_wakeup(struct rq *__rq, struct task_struct *wakee, int success) unsigned long flags; int cpu, pc; - if (!likely(tracer_enabled)) + if (unlikely(!sched_ref)) return; - pc = preempt_count(); tracing_record_cmdline(current); - if (sched_stopped) + if (!tracer_enabled || sched_stopped) return; + pc = preempt_count(); local_irq_save(flags); cpu = raw_smp_processor_id(); data = ctx_trace->data[cpu]; -- 1.5.5.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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