linux-kernel - Re: [PATCH 12/13] hrtimer: create a "timer

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Date:	Sun, 14 Sep 2008 09:14:22 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	"Ulrich Drepper" <drepper@...il.com>
Cc:	"Pavel Machek" <pavel@...e.cz>, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, dwmw2@...radead.org,
	drepper@...hat.com, mingo@...e.hu, tglx@...x.de
Subject: Re: [PATCH 12/13] hrtimer: create a "timer_slack" field in the task
 struct

On Sun, 14 Sep 2008 09:04:08 -0700
"Ulrich Drepper" <drepper@...il.com> wrote:

> 
> You cannot really use the environment for anything meaningful.
> Especially for this case, you couldn't change the setting for a
> running process.  What a fully-userlevel implementation would have to
> do is read the value from a file and monitor the file for changes for
> every new poll/select call.  That's a huge cost.

in addition, the value really is per thread, not per process, and how
do you want to do that with env. variables?

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
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