From: Mike Galbraith <efault@gmx.de>
To: Davide Libenzi <davidel@xmailserver.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [patch] SCHED_SOFTRR starve-free linux scheduling policy ...
Date: Mon, 14 Jul 2003 09:11:39 +0200 [thread overview]
Message-ID: <5.2.1.1.2.20030714063443.01bcc5f0@pop.gmx.net> (raw)
In-Reply-To: <Pine.LNX.4.55.0307131442470.15022@bigblue.dev.mcafeelabs.c om>
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At 02:51 PM 7/13/2003 -0700, Davide Libenzi wrote:
>This should (hopefully) avoid other tasks starvation exploits :
>
>http://www.xmailserver.org/linux-patches/softrr.html
Yes, that ~works. I couldn't starve root to death as a SCHED_SOFTRR user,
but the system was very sluggish, with keystrokes taking uncomfortably
long. I also had some sound skips due to inheritance. If I activate
xmms's gl visualization under load, it inherits SCHED_SOFTRR, says "oink"
in a very deep voice, and other xmms threads expire. Maybe tasks shouldn't
inherit SCHED_SOFTRR?
While testing, I spotted something pretty strange. It's not specific to
SCHED_SOFTRR, SCHED_RR causes it too. If I fire up xmms's gl visualization
with either policy, X stops getting enough sleep credit to stay at a usable
priority even when cpu usage is low. Fully repeatable weirdness. See
attached top snapshots.
-Mike
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--------------------------------- Abby Normal ---------------------------
top - 05:44:20 up 1:27, 4 users, load average: 3.93, 4.71, 5.00
Tasks: 83 total, 4 running, 79 sleeping, 0 stopped, 0 zombie
Cpu(s): 90.5% user, 9.5% system, 0.0% nice, 0.0% idle, 0.0% IO-wait
Mem: 125712k total, 112860k used, 12852k free, 5048k buffers
Swap: 265064k total, 16900k used, 248164k free, 50020k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ Command
5035 mikeg -2 0 28136 7328 9952 S 67.6 5.8 8:19.60 xmms
4532 root 25 0 62800 12m 46m R 8.6 9.8 3:38.64 X
4596 root -51 0 7232 4720 5256 S 4.8 3.8 0:21.90 artsd
4647 root 15 0 20100 8300 18m R 4.8 6.6 0:23.19 kdeinit
8611 mikeg -2 0 28136 7328 9952 S 4.8 5.8 0:19.16 xmms
5011 mikeg -2 0 28136 7328 9952 S 3.8 5.8 0:28.75 xmms
4651 root 15 0 1800 1800 1640 R 2.9 1.4 0:55.81 top
4564 root 15 0 19068 6660 17m S 1.0 5.3 0:09.84 kdeinit
8618 mikeg -2 0 28136 7328 9952 R 1.0 5.8 0:01.94 xmms
1 root 15 0 1380 500 1336 S 0.0 0.4 0:04.23 init
2 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0
3 root 5 -10 0 0 0 S 0.0 0.0 0:00.21 events/0
4 root 5 -10 0 0 0 S 0.0 0.0 0:00.29 kblockd/0
5 root 15 0 0 0 0 S 0.0 0.0 0:00.15 kapmd
6 root 15 0 0 0 0 S 0.0 0.0 0:00.00 pdflush
7 root 15 0 0 0 0 S 0.0 0.0 0:00.33 pdflush
8 root 15 0 0 0 0 S 0.0 0.0 0:01.02 kswapd0
--------------------------------- Norm Normal ---------------------------
top - 06:00:22 up 1:43, 4 users, load average: 1.48, 2.39, 3.46
Tasks: 85 total, 2 running, 83 sleeping, 0 stopped, 0 zombie
Cpu(s): 94.2% user, 5.8% system, 0.0% nice, 0.0% idle, 0.0% IO-wait
Mem: 125712k total, 120700k used, 5012k free, 6288k buffers
Swap: 265064k total, 15896k used, 249168k free, 53276k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ Command
8784 root 25 0 28016 8784 9952 R 65.0 7.0 0:35.71 xmms
4532 root 15 0 62816 12m 46m S 19.4 9.9 5:46.30 X
8781 root 15 0 28016 8784 9952 S 4.9 7.0 0:02.72 xmms
4651 root 16 0 1800 1800 1640 R 3.9 1.4 1:23.98 top
8786 root 15 0 28016 8784 9952 S 3.9 7.0 0:01.48 xmms
4596 root -51 0 7232 4720 5256 S 1.9 3.8 0:32.01 artsd
4614 root 15 0 19640 7628 18m S 1.0 6.1 0:11.21 kdeinit
4647 root 15 0 20292 8440 18m S 1.0 6.7 0:35.55 kdeinit
1 root 15 0 1380 500 1336 S 0.0 0.4 0:04.25 init
2 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0
3 root 5 -10 0 0 0 S 0.0 0.0 0:00.28 events/0
4 root 5 -10 0 0 0 S 0.0 0.0 0:00.29 kblockd/0
5 root 15 0 0 0 0 S 0.0 0.0 0:00.22 kapmd
6 root 15 0 0 0 0 S 0.0 0.0 0:00.00 pdflush
7 root 15 0 0 0 0 S 0.0 0.0 0:00.35 pdflush
8 root 15 0 0 0 0 S 0.0 0.0 0:01.02 kswapd0
next parent reply other threads:[~2003-07-14 6:52 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.55.0307131442470.15022@bigblue.dev.mcafeelabs.c om>
2003-07-14 7:11 ` Mike Galbraith [this message]
2003-07-13 21:51 ` Davide Libenzi
2003-08-09 14:05 ` Daniel Phillips
2003-08-09 17:47 ` Mike Galbraith
2003-08-09 23:58 ` Daniel Phillips
2003-08-10 6:06 ` Mike Galbraith
2003-08-10 0:41 ` Daniel Phillips
2003-08-10 6:41 ` Mike Galbraith
2003-08-10 15:46 ` Daniel Phillips
2003-08-10 17:49 ` Mike Galbraith
2003-08-10 20:28 ` Daniel Phillips
2003-08-11 5:31 ` Mike Galbraith
2003-08-11 13:54 ` Takashi Iwai
2003-08-10 2:05 ` Roger Larsson
2003-08-10 5:43 ` Nick Piggin
2003-08-10 7:41 ` Mike Galbraith
2003-08-10 7:56 ` Nick Piggin
2003-08-10 8:18 ` Mike Galbraith
2003-08-10 9:19 ` jw schultz
2003-08-11 17:01 ` Roger Larsson
2003-08-11 17:25 ` Takashi Iwai
[not found] ` <200308100405.52858.roger.larsson@skelleftea.mail.telia.com >
2003-08-10 7:11 ` Mike Galbraith
2003-08-12 7:23 ` Rob Landley
2003-08-12 23:35 ` Pavel Machek
2003-08-13 6:26 ` Mike Galbraith
2003-08-13 9:41 ` Pavel Machek
2003-07-14 7:12 ` Davide Libenzi
2003-07-14 7:24 ` Jamie Lokier
2003-07-14 7:35 ` Davide Libenzi
2003-07-14 9:11 ` Mike Galbraith
[not found] ` <Pine.LNX.4.55.0307140004390.3435@bigblue.dev.mcafeelabs.co m>
2003-07-14 8:14 ` Mike Galbraith
2003-07-14 15:09 ` Davide Libenzi
[not found] ` <Pine.LNX.4.55.0307140805220.4371@bigblue.dev.mcafeelabs.co m>
2003-07-14 16:06 ` Mike Galbraith
2003-07-14 17:22 ` Davide Libenzi
[not found] ` <Pine.LNX.4.55.0307141015010.4828@bigblue.dev.mcafeelabs.co m>
2003-07-15 4:56 ` Mike Galbraith
2003-07-15 15:47 ` Davide Libenzi
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