From: Mike Galbraith <efault@gmx.de>
To: Michael Witten <mfwitten@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 'autogroup' sched code KILLING responsiveness
Date: Sat, 22 Jan 2011 04:22:34 +0100 [thread overview]
Message-ID: <1295666554.8265.2.camel@marge.simson.net> (raw)
In-Reply-To: <AANLkTini15poUNM54UrM5KmGAoyJOznReYAFCkoxKEyN@mail.gmail.com>
On Fri, 2011-01-21 at 16:39 -0600, Michael Witten wrote:
> On Fri, Jan 21, 2011 at 16:27, Mike Galbraith <efault@gmx.de> wrote:
> > On Fri, 2011-01-21 at 10:20 -0800, Michael Witten wrote:
> >> Bisecting shows that this commit:
> >>
> >> 5091faa449ee0b7d73bc296a93bca9540fc51d0a
> >> sched: Add 'autogroup' scheduling feature: automated per session task groups
> >> Date: Tue Nov 30 14:18:03 2010 +0100
> >>
> >> is the reason that my computer has become unusable.
> >>
> >> With that code in place, a resource-intensive activity (such as
> >> compiling the Linux kernel) causes my computer to become
> >> unresponsive for many seconds at a time; the entire screen
> >> does not refresh, typed keys are dropped or are handled very
> >> late, etc (even in Linux's plain virtual consoles).
> >
> > That's not what I'm experiencing with a UP kernel...
>
> Before I try to gather any data, I'd like to point out that the
> problem disappears when I disable CONFIG_SCHED_AUTOGROUP (General
> setup -> Automatic process group scheduling).
>
> Do you have it disabled?
No, ff I did, mplayer wouldn't be able to get more than 1% cpu.
top - 22:34:38 up 33 min, 22 users, load average: 104.07, 101.73, 78.13
Tasks: 675 total, 101 running, 574 sleeping, 0 stopped, 0 zombie
Cpu(s): 95.2%us, 4.8%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ P COMMAND
6770 root 20 0 401m 79m 29m R 46.9 1.0 3:22.66 0 mplayer
6100 root 20 0 449m 94m 18m S 2.9 1.2 1:33.82 0 Xorg
7486 root 20 0 374m 46m 17m S 2.9 0.6 0:54.02 0 konsole
-Mike
next prev parent reply other threads:[~2011-01-22 3:22 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-21 18:20 'autogroup' sched code KILLING responsiveness Michael Witten
2011-01-21 22:27 ` Mike Galbraith
2011-01-21 22:39 ` Michael Witten
2011-01-22 3:22 ` Mike Galbraith [this message]
2011-01-22 21:23 ` Michael Witten
2011-01-23 3:32 ` Michael Witten
2011-01-23 5:42 ` Mike Galbraith
2011-01-23 10:50 ` Christian Kujau
2011-01-23 11:19 ` Christian Kujau
2011-01-23 14:54 ` Yong Zhang
2011-01-23 15:03 ` [PATCH] sched: fix autogroup nice tune on UP Yong Zhang
2011-01-23 15:16 ` Pekka Enberg
2011-01-24 3:17 ` Yong Zhang
2011-01-24 5:40 ` [PATCH V2] " Yong Zhang
2011-01-24 5:54 ` Pekka Enberg
2011-01-24 6:11 ` Yong Zhang
2011-01-24 6:18 ` Pekka Enberg
2011-01-24 7:33 ` [PATCH V3] " Yong Zhang
2011-01-24 8:01 ` Pekka Enberg
2011-01-24 9:00 ` Mike Galbraith
2011-01-24 10:51 ` [tip:sched/urgent] sched: Fix poor interactivity on UP systems due to group scheduler nice tune bug tip-bot for Yong Zhang
2011-01-23 15:15 ` 'autogroup' sched code KILLING responsiveness Ingo Molnar
2011-01-23 15:53 ` Michael Witten
2011-01-23 18:52 ` Andreas Mohr
2011-01-23 23:57 ` Christian Kujau
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