From: Ingo Molnar <mingo@elte.hu>
To: David Howells <dhowells@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Jakub Jelinek <jakub@redhat.com>,
Ulrich Drepper <drepper@redhat.com>,
Andi Kleen <andi@firstfloor.org>, Rik van Riel <riel@redhat.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, Hugh Dickins <hugh@veritas.com>
Subject: Re: preemption and rwsems (was: Re: missing madvise functionality)
Date: Thu, 5 Apr 2007 21:11:29 +0200 [thread overview]
Message-ID: <20070405191129.GC22092@elte.hu> (raw)
In-Reply-To: <19526.1175777338@redhat.com>
* David Howells <dhowells@redhat.com> wrote:
> But short of recording the lock sequence, I don't think there's anyway
> to find out for sure. printk probably won't cut it as a recording
> mechanism because its overheads are too great.
getting a good trace of it is easy: pick up the latest -rt kernel from:
http://redhat.com/~mingo/realtime-preempt/
enable EVENT_TRACING in that kernel, run the workload
and do:
scripts/trace-it > to-ingo.txt
and send me the output. It will be large but interesting. That should
get us a whole lot closer to what happens. A (much!) more finegrained
result would be to also enable FUNCTION_TRACING and to do:
echo 1 > /proc/sys/kernel/mcount_enabled
before running trace-it.
Ingo
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2007-04-05 19:11 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <46128051.9000609@redhat.com>
[not found] ` <p73648dz5oa.fsf@bingen.suse.de>
[not found] ` <46128CC2.9090809@redhat.com>
[not found] ` <20070403172841.GB23689@one.firstfloor.org>
2007-04-03 19:59 ` missing madvise functionality Andrew Morton
2007-04-03 20:09 ` Andi Kleen
2007-04-03 20:17 ` Ulrich Drepper
2007-04-03 20:29 ` Jakub Jelinek
2007-04-03 20:38 ` Rik van Riel
2007-04-03 21:49 ` Andrew Morton
2007-04-03 23:01 ` Eric Dumazet
2007-04-04 2:22 ` Nick Piggin
2007-04-04 5:41 ` Eric Dumazet
2007-04-04 6:09 ` [patches] threaded vma patches (was Re: missing madvise functionality) Nick Piggin
2007-04-04 6:26 ` Andrew Morton
2007-04-04 6:38 ` Nick Piggin
2007-04-04 6:42 ` Ulrich Drepper
2007-04-04 6:44 ` Nick Piggin
2007-04-04 6:50 ` Eric Dumazet
2007-04-04 6:54 ` Ulrich Drepper
2007-04-04 7:33 ` Eric Dumazet
2007-04-04 8:25 ` missing madvise functionality Peter Zijlstra
2007-04-04 8:55 ` Nick Piggin
2007-04-04 9:12 ` William Lee Irwin III
2007-04-04 9:23 ` Nick Piggin
2007-04-04 9:34 ` Eric Dumazet
2007-04-04 9:45 ` Nick Piggin
2007-04-04 10:05 ` Nick Piggin
2007-04-04 11:54 ` Eric Dumazet
2007-04-05 2:01 ` Nick Piggin
2007-04-05 6:09 ` Eric Dumazet
2007-04-05 6:19 ` Ulrich Drepper
2007-04-05 6:54 ` Eric Dumazet
2007-04-03 23:02 ` Andrew Morton
2007-04-04 9:15 ` Hugh Dickins
2007-04-04 14:55 ` Rik van Riel
2007-04-04 15:25 ` Hugh Dickins
2007-04-05 1:44 ` Nick Piggin
2007-04-04 18:04 ` Andrew Morton
2007-04-04 18:08 ` Rik van Riel
2007-04-04 20:56 ` Andrew Morton
2007-04-04 18:39 ` Hugh Dickins
2007-04-03 23:44 ` Andrew Morton
2007-04-04 13:09 ` William Lee Irwin III
2007-04-04 13:38 ` William Lee Irwin III
2007-04-04 18:51 ` Andrew Morton
2007-04-05 4:14 ` William Lee Irwin III
2007-04-04 23:00 ` preemption and rwsems (was: Re: missing madvise functionality) Andrew Morton
2007-04-05 7:31 ` missing madvise functionality Rik van Riel
2007-04-05 7:39 ` Rik van Riel
2007-04-05 8:32 ` Andrew Morton
2007-04-05 15:47 ` Rik van Riel
2007-04-05 8:08 ` Eric Dumazet
2007-04-05 8:31 ` Rik van Riel
2007-04-05 9:06 ` Eric Dumazet
2007-04-05 9:45 ` Jakub Jelinek
2007-04-05 16:15 ` Rik van Riel
2007-04-05 16:10 ` Ulrich Drepper
2007-04-06 2:28 ` Nick Piggin
2007-04-06 2:52 ` Ulrich Drepper
2007-04-06 2:59 ` Nick Piggin
2007-04-05 12:48 ` preemption and rwsems (was: Re: missing madvise functionality) David Howells
2007-04-05 19:11 ` Ingo Molnar [this message]
2007-04-05 20:37 ` Andrew Morton
2007-04-06 9:08 ` Ingo Molnar
2007-04-06 19:30 ` Andrew Morton
2007-04-06 19:40 ` Ingo Molnar
2007-04-05 19:27 ` Andrew Morton
2007-04-03 20:51 ` missing madvise functionality Andrew Morton
2007-04-03 20:57 ` Ulrich Drepper
2007-04-03 21:00 ` Rik van Riel
2007-04-03 21:10 ` Eric Dumazet
2007-04-03 21:12 ` Jörn Engel
2007-04-03 21:15 ` Rik van Riel
2007-04-03 21:30 ` Eric Dumazet
2007-04-03 21:22 ` Jeremy Fitzhardinge
2007-04-03 21:29 ` Rik van Riel
2007-04-03 21:46 ` Ulrich Drepper
2007-04-03 22:51 ` Andi Kleen
2007-04-03 23:07 ` Ulrich Drepper
2007-04-03 21:16 ` Andrew Morton
2007-04-04 18:49 ` Anton Blanchard
2007-04-04 7:46 ` Nick Piggin
2007-04-04 8:04 ` Nick Piggin
2007-04-04 8:20 ` Jakub Jelinek
2007-04-04 8:47 ` Nick Piggin
2007-04-05 4:23 ` Nick Piggin
2007-04-05 18:38 ` Rik van Riel
2007-04-05 21:07 ` Andrew Morton
2007-04-05 21:39 ` Rik van Riel
2007-04-06 1:28 ` Nick Piggin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20070405191129.GC22092@elte.hu \
--to=mingo@elte.hu \
--cc=akpm@linux-foundation.org \
--cc=andi@firstfloor.org \
--cc=dhowells@redhat.com \
--cc=drepper@redhat.com \
--cc=hugh@veritas.com \
--cc=jakub@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=riel@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox