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

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Message-ID: <BANLkTikx9gENppLG4xwYOKSoFyhY+xXS=Q@mail.gmail.com>
Date:	Sat, 4 Jun 2011 12:26:18 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.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 2, 2011 at 4:04 PM, Yong Zhang <yong.zhang0@...il.com> wrote:
> On Wed, Jun 1, 2011 at 10:03 PM, Hillf Danton <dhillf@...il.com> wrote:
>> Resetting exec_start, after updated in update_curr_rt(), could open window for
>> messing up the subsequent computations of delta_exec of the given task.
>
> I can't see how could this happen. what kind of 'subsequent computations'
> do you mean?
>
> But because exec_start will be reset by _pick_next_task_rt()/set_curr_task_rt(),
> you patch is ok. IMHO it is not critical, it's just cleanup instead.
>

H i Yong

The window is closed in the two cases, as you tip fingered, would you please
say a few more words about the window and tick timer?

thanks
           Hillf
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