From: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>
To: Mike Galbraith <efault-Mmb7MZpHnFY@public.gmane.org>
Cc: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>,
rjw-KKrjLPT3xs0@public.gmane.org,
a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
kernel-testers-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [Bug #12208] uml is very slow on 2.6.28 host
Date: Thu, 18 Dec 2008 15:37:52 +0100 [thread overview]
Message-ID: <20081218143752.GB10548@elte.hu> (raw)
In-Reply-To: <1229494628.5280.24.camel-YqMYhexLQo1vAv1Ojkdn7Q@public.gmane.org>
* Mike Galbraith <efault-Mmb7MZpHnFY@public.gmane.org> wrote:
> On Tue, 2008-12-16 at 16:27 +0100, Miklos Szeredi wrote:
>
> > Is there a way to trace what is happening in the scheduler?
>
> Sure. Ingo has a script for gathering info (attached), if you run it,
> please gzip up the output and send me a copy offline to eyeball.
>
> There's also ftrace, but I've not tried that yet, so can't offer any
> advice, I use primitive but effective time_after() + printk() with klogd
> wakeup disabled (deadlock).
btw., there's a recent commit:
32a7600: printk: make printk more robust by not allowing recursion
since then printk shouldnt deadlock anymore, even if called from within
the scheduler.
Btw., ftrace_printk() can be used similarly (and you can capture it
nonstop via /debug/tracing/trace_pipe), and should not deadlock either.
Ingo
next prev parent reply other threads:[~2008-12-18 14:37 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-13 16:29 2.6.28-rc8-git1: Reported regressions from 2.6.27 Rafael J. Wysocki
2008-12-13 16:29 ` [Bug #11849] default IRQ affinity change in v2.6.27 (breaking several SMP PPC based systems) Rafael J. Wysocki
2008-12-13 16:33 ` [Bug #12047] ACPI toshiba: only register rfkill if bt is enabled Rafael J. Wysocki
2008-12-13 16:33 ` [Bug #12028] i915 DRM is broken in 2.6.28-rc4 Rafael J. Wysocki
2008-12-13 16:33 ` [Bug #12061] snd_hda_intel: power_save: sound cracks on powerdown Rafael J. Wysocki
2008-12-13 16:33 ` [Bug #12156] v2.6.28-rc2: x86_32 relocation regression? Rafael J. Wysocki
2008-12-13 16:33 ` [Bug #12100] resume (S2R) broken by Intel microcode module, on A110L Rafael J. Wysocki
2008-12-13 16:33 ` [Bug #12159] 2.6.28-rc6-git1 -- No sound produced from Intel HDA ALSA driver Rafael J. Wysocki
2008-12-13 16:33 ` [Bug #12155] Regression in 2.6.28-rc and 2.6.27-stable - hibernate related Rafael J. Wysocki
2008-12-13 18:45 ` Fabio Comolli
[not found] ` <b637ec0b0812131045n34bf420w3729abf24533b51c-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-12-13 18:56 ` Rafael J. Wysocki
[not found] ` <200812131956.03495.rjw-KKrjLPT3xs0@public.gmane.org>
2008-12-14 23:11 ` Dave Kleikamp
2008-12-16 19:07 ` Ingo Molnar
[not found] ` <20081216190707.GA336-X9Un+BFzKDI@public.gmane.org>
2008-12-16 19:14 ` Linus Torvalds
[not found] ` <alpine.LFD.2.00.0812161113350.14014-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2008-12-16 19:18 ` Ingo Molnar
[not found] ` <20081216191827.GA1176-X9Un+BFzKDI@public.gmane.org>
2008-12-16 19:51 ` Greg KH
2008-12-13 16:33 ` [Bug #12160] networking oops after resume from s2ram (2.6.28-rc6) Rafael J. Wysocki
2008-12-13 16:33 ` [Bug #12178] Xorg crash at first start Rafael J. Wysocki
2008-12-13 16:33 ` [Bug #12195] "dd" make kernel panic Rafael J. Wysocki
2008-12-13 16:33 ` [Bug #12209] oldish top core dumps (in its meminfo() function) Rafael J. Wysocki
2008-12-13 16:33 ` [Bug #12208] uml is very slow on 2.6.28 host Rafael J. Wysocki
2008-12-16 0:49 ` Miklos Szeredi
[not found] ` <E1LCO85-0000rR-Br-8f8m9JG5TPIdUIPVzhDTVZP2KDSNp7ea@public.gmane.org>
2008-12-16 3:25 ` Mike Galbraith
[not found] ` <1229397927.5296.48.camel-YqMYhexLQo1vAv1Ojkdn7Q@public.gmane.org>
2008-12-16 10:26 ` Miklos Szeredi
[not found] ` <E1LCX8h-0001sh-Uo-8f8m9JG5TPIdUIPVzhDTVZP2KDSNp7ea@public.gmane.org>
2008-12-16 14:19 ` Mike Galbraith
[not found] ` <1229437180.5379.76.camel-YqMYhexLQo1vAv1Ojkdn7Q@public.gmane.org>
2008-12-16 15:27 ` Miklos Szeredi
[not found] ` <E1LCbpI-0002MN-7R-8f8m9JG5TPIdUIPVzhDTVZP2KDSNp7ea@public.gmane.org>
2008-12-17 6:17 ` Mike Galbraith
[not found] ` <1229494628.5280.24.camel-YqMYhexLQo1vAv1Ojkdn7Q@public.gmane.org>
2008-12-18 14:37 ` Ingo Molnar [this message]
2008-12-16 6:56 ` Peter Zijlstra
2008-12-13 16:33 ` [Bug #12210] 2.6.28-rc8 big regression in VM Rafael J. Wysocki
2008-12-25 11:20 ` Wu Fengguang
2008-12-25 14:11 ` Rafael J. Wysocki
-- strict thread matches above, loose matches on Subject: below --
2008-12-20 21:56 2.6.28-rc9-git1: Reported regressions from 2.6.27 Rafael J. Wysocki
2008-12-20 22:00 ` [Bug #12208] uml is very slow on 2.6.28 host Rafael J. Wysocki
[not found] <nn3SOLVZ28H.A.bY.CafaJB@chimera>
2009-01-11 11:41 ` Rafael J. Wysocki
2009-01-12 10:04 ` Miklos Szeredi
[not found] ` <E1LMJex-0001lB-SE-8f8m9JG5TPIdUIPVzhDTVZP2KDSNp7ea@public.gmane.org>
2009-01-12 12:28 ` Rafael J. Wysocki
2009-01-19 21:41 2.6.29-rc2-git1: Reported regressions 2.6.27 -> 2.6.28 Rafael J. Wysocki
2009-01-19 21:45 ` [Bug #12208] uml is very slow on 2.6.28 host Rafael J. Wysocki
2009-01-26 11:35 ` Miklos Szeredi
2009-02-04 10:55 2.6.29-rc3-git6: Reported regressions 2.6.27 -> 2.6.28 Rafael J. Wysocki
2009-02-04 10:58 ` [Bug #12208] uml is very slow on 2.6.28 host Rafael J. Wysocki
[not found] <rjw@sisk.pl>
2009-02-05 18:41 ` greg-R92VP3DqSWVWk0Htik3J/w
2009-02-14 20:48 2.6.29-rc5: Reported regressions 2.6.27 -> 2.6.28 Rafael J. Wysocki
2009-02-14 20:50 ` [Bug #12208] uml is very slow on 2.6.28 host Rafael J. Wysocki
2009-02-22 13:58 ` Américo Wang
[not found] ` <20090222135818.GA12782-2ZPHldtDychwKoX9GjgWag@public.gmane.org>
2009-02-23 14:27 ` Miklos Szeredi
2009-02-23 22:00 2.6.29-rc6: Reported regressions 2.6.27 -> 2.6.28 Rafael J. Wysocki
2009-02-23 22:02 ` [Bug #12208] uml is very slow on 2.6.28 host Rafael J. Wysocki
2009-03-03 19:34 2.6.29-rc6-git7: Reported regressions 2.6.27 -> 2.6.28 Rafael J. Wysocki
2009-03-03 19:41 ` [Bug #12208] uml is very slow on 2.6.28 host Rafael J. Wysocki
2009-03-14 19:11 2.6.29-rc8: Reported regressions 2.6.27 -> 2.6.28 Rafael J. Wysocki
2009-03-14 19:20 ` [Bug #12208] uml is very slow on 2.6.28 host Rafael J. Wysocki
2009-03-21 17:01 2.6.29-rc8-git5: Reported regressions 2.6.27 -> 2.6.28 Rafael J. Wysocki
2009-03-21 17:07 ` [Bug #12208] uml is very slow on 2.6.28 host Rafael J. Wysocki
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