linux-kernel - Re: [PATCH] Fix delay accounting regression

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Message-ID: <20071103083358.GE10760@elte.hu>
Date:	Sat, 3 Nov 2007 09:33:58 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Fix delay accounting regression


* Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> On Fri, Nov 02, 2007 at 04:53:58PM +0100, Ingo Molnar wrote:
> > 
> > * Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> > 
> > > Fix the delay accounting regression introduced by commit 
> > > 75d4ef16a6aa84f708188bada182315f80aab6fa. rq no longer has sched_info 
> > > data associated with it. task_struct sched_info structure is used by 
> > > delay accounting to provide back statistics to user space.
> > 
> > no, this really is broken code. sched_clock() is not a generally 
> > reliable time source so at a minimum the rq->clock fix i mentioned is 
> > needed. What user-space tools are utilizing delay-accounting by the way? 
> > We have most of this data available under SCHEDSTATS - how about 
> > consolidating CONFIG_TASK_DELAY_ACCT into CONFIG_SCHEDSTATS?
> > 
> > 	Ingo
> 
> Hi, Ingo,
> 
> How about this?

thanks, applied.

	Ingo
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