[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <BLU436-SMTP1068D40BBCD5342AD394C978A760@phx.gbl>
Date: Tue, 4 Aug 2015 15:05:56 +0800
From: Oliver Yang <yang_oliver@...mail.com>
To: Steven Rostedt <rostedt@...dmis.org>
CC: mingo@...hat.com, linux-kernel@...r.kernel.org,
Yong Yang <yangoliver@...il.com>,
Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 1/2] sched: Some sched trace points should depend on
SCHEDSTATS
On 2015/8/4 1:34, Steven Rostedt wrote:
> On Mon, 27 Jul 2015 09:11:51 -0400
> yangoliver <yang_oliver@...mail.com> wrote:
>
>> When SCHEDSTATS is not enabled, follow trace points shouldn't be
>> accessed by default,
>>
>> sched:sched_stat_wait
>> sched:sched_stat_sleep
>> sched:sched_stat_iowait
>> sched:sched_stat_blocked
>>
>> These trace points should only be available when SCHEDSTATS is
>> enabled.
>>
>> Signed-off-by: Yong Yang <yangoliver@...il.com>
>> ---
>> include/trace/events/sched.h | 2 ++
>> 1 file changed, 2 insertions(+)
>>
>> diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
>> index d57a575..5b34309 100644
>> --- a/include/trace/events/sched.h
>> +++ b/include/trace/events/sched.h
>> @@ -334,6 +334,7 @@ DECLARE_EVENT_CLASS(sched_stat_template,
>> );
>>
>>
>> +#ifdef CONFIG_SCHEDSTATS
> Why not also surround the sched_stat_template too? That also creates
> code even if no event uses it.
Steve,
Because the sched_stat_template is used by sched_stat_runtime.
The sched_stat_runtime is used event without SCHEDSTATS option enabled.
And the se.sum_exec_runtime counter is also similar. I don't think this counter is
defined for SCHEDSTATS.
Yes. I just try to make our trace points design be similar with SCHEDSTATS counters
design.
> -- Steve
>
>> /*
>> * Tracepoint for accounting wait time (time the task is runnable
>> * but not actually running due to scheduler contention).
>> @@ -364,6 +365,7 @@ DEFINE_EVENT(sched_stat_template, sched_stat_iowait,
>> DEFINE_EVENT(sched_stat_template, sched_stat_blocked,
>> TP_PROTO(struct task_struct *tsk, u64 delay),
>> TP_ARGS(tsk, delay));
>> +#endif
>>
>> /*
>> * Tracepoint for accounting runtime (time the task is executing
--
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/
Powered by blists - more mailing lists