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

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Date:	Fri, 2 Nov 2007 16:53:58 +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:

> 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
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