From: Spencer Candland <spencer@bluehost.com>
To: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: "Peter Zijlstra" <peterz@infradead.org>,
"Hidetoshi Seto" <seto.hidetoshi@jp.fujitsu.com>,
"Américo Wang" <xiyou.wangcong@gmail.com>,
linux-kernel@vger.kernel.org, "Ingo Molnar" <mingo@elte.hu>,
"Oleg Nesterov" <oleg@redhat.com>
Subject: Re: [PATCH] fix granularity of task_u/stime(), v2
Date: Mon, 16 Nov 2009 12:32:43 -0700 [thread overview]
Message-ID: <4B01A8DB.6090002@bluehost.com> (raw)
In-Reply-To: <20091112154050.GC6218@dhcp-lab-161.englab.brq.redhat.com>
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@linux.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
next prev parent reply other threads:[~2009-11-16 19:32 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-04 0:23 utime/stime decreasing on thread exit Spencer Candland
2009-11-04 6:49 ` Hidetoshi Seto
2009-11-05 5:24 ` Hidetoshi Seto
2009-11-09 14:49 ` Peter Zijlstra
2009-11-09 17:20 ` Oleg Nesterov
2009-11-09 17:27 ` Oleg Nesterov
2009-11-09 17:31 ` Peter Zijlstra
2009-11-09 19:23 ` Oleg Nesterov
2009-11-09 19:32 ` Peter Zijlstra
2009-11-10 10:44 ` Stanislaw Gruszka
2009-11-10 17:40 ` Oleg Nesterov
2009-11-10 18:24 ` Stanislaw Gruszka
2009-11-10 19:23 ` Oleg Nesterov
2009-11-17 12:48 ` Stanislaw Gruszka
2009-11-17 12:57 ` [PATCH] posix-cpu-timers: reset expire cache when no timer is running Stanislaw Gruszka
2009-11-10 5:42 ` utime/stime decreasing on thread exit Hidetoshi Seto
2009-11-10 5:47 ` [PATCH] fix granularity of task_u/stime() Hidetoshi Seto
2009-11-11 12:11 ` Stanislaw Gruszka
2009-11-12 0:00 ` Hidetoshi Seto
2009-11-12 2:49 ` Hidetoshi Seto
2009-11-12 2:55 ` Américo Wang
2009-11-12 4:16 ` Hidetoshi Seto
2009-11-12 4:33 ` [PATCH] fix granularity of task_u/stime(), v2 Hidetoshi Seto
2009-11-12 14:15 ` Peter Zijlstra
2009-11-12 14:49 ` Stanislaw Gruszka
2009-11-12 15:00 ` Peter Zijlstra
2009-11-12 15:40 ` Stanislaw Gruszka
2009-11-13 12:42 ` [PATCH] sys_times: fix utime/stime decreasing on thread exit Stanislaw Gruszka
2009-11-13 13:16 ` Peter Zijlstra
2009-11-13 14:12 ` Balbir Singh
2009-11-13 15:36 ` Stanislaw Gruszka
2009-11-13 17:05 ` Peter Zijlstra
2009-11-16 19:32 ` Spencer Candland [this message]
2009-11-17 13:08 ` [PATCH] fix granularity of task_u/stime(), v2 Stanislaw Gruszka
2009-11-17 13:24 ` Peter Zijlstra
2009-11-19 18:17 ` Stanislaw Gruszka
2009-11-20 2:00 ` Hidetoshi Seto
2009-11-23 10:09 ` Stanislaw Gruszka
2009-11-23 10:16 ` [PATCH] cputime: avoid do_sys_times() races with __exit_signal() Stanislaw Gruszka
2009-11-30 9:20 ` [PATCH 1/2] cputime: remove prev_{u,s}time if VIRT_CPU_ACCOUNTING Hidetoshi Seto
2009-11-30 9:21 ` [PATCH 2/2] cputime: introduce thread_group_times() Hidetoshi Seto
2009-11-30 14:54 ` Stanislaw Gruszka
2009-12-01 1:02 ` Hidetoshi Seto
2009-12-02 8:26 ` [PATCH -v2 1/2] sched, cputime: cleanups related to task_times() Hidetoshi Seto
2009-12-02 15:17 ` Peter Zijlstra
2009-12-02 15:29 ` Balbir Singh
2009-12-03 0:21 ` Hidetoshi Seto
2009-12-02 15:57 ` Peter Zijlstra
2009-12-02 17:33 ` [tip:sched/core] sched, cputime: Cleanups " tip-bot for Hidetoshi Seto
2009-12-02 8:28 ` [PATCH -v2 2/2] sched, cputime: introduce thread_group_times() Hidetoshi Seto
2009-12-02 15:58 ` Peter Zijlstra
2009-12-02 17:33 ` [tip:sched/core] sched, cputime: Introduce thread_group_times() tip-bot for Hidetoshi Seto
2009-12-02 8:29 ` reproducer: utime decreasing Hidetoshi Seto
2009-12-02 8:32 ` reproducer: invisible utime Hidetoshi Seto
2009-11-23 10:25 ` [PATCH] fix granularity of task_u/stime(), v2 Balbir Singh
2009-11-23 10:46 ` Stanislaw Gruszka
2009-11-24 5:33 ` Hidetoshi Seto
2009-11-18 22:38 ` Spencer Candland
2009-11-23 9:52 ` Stanislaw Gruszka
2009-11-12 18:12 ` [tip:sched/core] sched: Fix granularity of task_u/stime() tip-bot for Hidetoshi Seto
2009-11-13 9:40 ` Stanislaw Gruszka
2009-11-13 23:09 ` Ingo Molnar
2009-11-16 2:44 ` Hidetoshi Seto
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