linux-kernel - Re: [PATCH 3/4] tracing/sched: Add sched_rt_push and sched_rt

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Message-ID: <4C990DC3.8040204@am.sony.com>
Date:	Tue, 21 Sep 2010 12:55:47 -0700
From:	Frank Rowand <frank.rowand@...sony.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	"Rowand, Frank" <Frank_Rowand@...yusa.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Gregory Haskins <ghaskins@...ell.com>
Subject: Re: [PATCH 3/4] tracing/sched: Add sched_rt_push and sched_rt_pull
 tracepoints

On 09/21/10 12:26, Frank Rowand wrote:
> On 09/21/10 06:36, Steven Rostedt wrote:
>> On Tue, 2010-09-21 at 08:33 -0400, Steven Rostedt wrote:
>>
>>>> Why doesn't the migration tracepoint cover this? It shows you the task,
>>>> the prio, the old and new cpu. If the migration is logged from the old
>>>> cpu, its a push, if its logged from the new its a pull, no?
> 
> Slight nuance...
> 
> If the migration is logged from a cpu other than the new cpu, it is a push.

And since the logged from cpu can be different than the old cpu, the logged
from cpu can be additional useful debugging or analysis information.

> 
>>>
>>> For some reason it did not help me enough in my analysis. I'll go back
>>> and see why.
>>>
>>> I originally had these tracepoints at the front of the series, and
>>> realized they may be a little controversial, thus I moved them to the
>>> end.
>>
>> OK, I went back and looked, and I think you are right. I can determine
>> this from the migration tracepoint. I think I was just being lazy and
>> wanted to have the direction obvious to me :-)  I can easily do that by
>> adding a plugin.
>>
>> Anyway, I'll remove this patch and rename the sched_rt_setprio
>> tracepoint to sched_pi_setprio. Would that be OK with you?
>>
>> Thanks,
>>
>> -- Steve

Regards,

Frank

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