linux-kernel - Re: [PATCH] sched: Distinguish sched_wakeup event when wake up a task which did schedule out or not.

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Message-ID: <20140512152818.GS30445@twins.programming.kicks-ass.net>
Date:	Mon, 12 May 2014 17:28:18 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Dongsheng Yang <dongsheng081251@...il.com>,
	"yangds.fnst" <yangds.fnst@...fujitsu.com>,
	linux-kernel@...r.kernel.org, mingo@...hat.com, bsegall@...gle.com
Subject: Re: [PATCH] sched: Distinguish sched_wakeup event when wake up a
 task which did schedule out or not.

On Mon, May 12, 2014 at 11:17:48AM -0400, Steven Rostedt wrote:
> On Mon, 12 May 2014 17:09:50 +0200
> Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > > Point being, this is useful information, why not pass it to userspace?
> > 
> > Because it adds code to one of the hottest code paths in the kernel and
> > so far nobody had a sane explanation of WTF they were doing.
> > 
> 
> Is there a measurable difference with these extra tracepoints?

Dunno, nobody tried and reported. I suppose its sitting there along with
the coherent changelog.

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