linux-kernel - Re: [PATCH] sched: remove resetting exec_start in put_prev_task

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Date:	Fri, 10 Jun 2011 10:38:44 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Hillf Danton <dhillf@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] sched: remove resetting exec_start in put_prev_task_rt()

On Thu, Jun 9, 2011 at 8:34 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> I disagree. Yes the exec_start is reset there, but I like the fact that
> it's 0 when not running.

Actually this depends on how we look at the code:
if we set exec_start to 0 explicitly, as you said the code is more direct and
readable.
if we don't set exec_start to 0, we can save one instruction though
it's minor.

I have no strong opinion on either of them :)

BTW, put_prev_task_fair() doesn't set exec_start to 0.

Thanks,
Yong


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