linux-kernel - Re: [PATCH] fix granularity of task

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Message-ID: <4B01A8DB.6090002@bluehost.com>
Date:	Mon, 16 Nov 2009 12:32:43 -0700
From:	Spencer Candland <spencer@...ehost.com>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH] fix granularity of task_u/stime(), v2



Stanislaw Gruszka wrote:
> Ok, I'm going to post this.
> 
> Spencer,
> 
> seems you have more test cases for utime decreasing issues,
> could you send links to me ? Somehow I could not find them 
> by my own. Particularly test case used in development this commit
> is interested:
> 
>   commit 49048622eae698e5c4ae61f7e71200f265ccc529
>   Author: Balbir Singh <balbir@...ux.vnet.ibm.com>
>   Date:   Fri Sep 5 18:12:23 2008 +0200
>     sched: fix process time monotonicity

I had originally noticed that in a production web server, so my test
case was designed to mirror what I was seeing there, which was just
running apache with worker mpm, and running a simple apache bench while
watching the utime/stime of the apache children.  Unfortunately that
method was not terribly reliable at reproducing the issue, which is why
I felt it necessary to try to come up with a better test case this time
around.

- Spencer
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