From: Andrew Morton <akpm@linux-foundation.org>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: mingo@elte.hu, torvalds@linux-foundation.org,
paulmck@linux.vnet.ibm.com, ghaskins@novell.com, matthew@wil.cx,
andi@firstfloor.org, chris.mason@oracle.com,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-btrfs@vger.kernel.org, tglx@linutronix.de, npiggin@suse.de,
pmorreale@novell.com, SDietrich@novell.com,
dmitry.adamushko@gmail.com, hannes@cmpxchg.org
Subject: Re: [GIT PULL] adaptive spinning mutexes
Date: Wed, 14 Jan 2009 12:21:31 -0800 [thread overview]
Message-ID: <20090114122131.021e96b0.akpm@linux-foundation.org> (raw)
In-Reply-To: <1231962650.14825.55.camel@laptop>
On Wed, 14 Jan 2009 20:50:50 +0100
Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:
> On Wed, 2009-01-14 at 11:36 -0800, Andrew Morton wrote:
>
> > Do people enable CONFIG_SCHED_DEBUG?
>
> Well, I have it always enabled, but I've honestly no idea if that makes
> me weird.
It'd be weird if you're not weird.
> > CONFIG_DEBUG_MUTEXES=n, CONFIG_SCHED_DEBUG=y is getting to be a pretty
> > small subset?
>
> Could be, do you fancy me doing a sysctl? shouldn't be hard.
The /sys/debug knob depends upon CONFIG_SCHED_DEBUG, I assume?
umm, yes, I do think that it would be prudent to make this control
unconditionally available. Experience tells us that any regressions
which this change causes could take a long time to turn up - sometimes
years. By which time the people who are reporting the regressions are
running packaged kernels, and if that packaged kernel didn't enable
CONFIG_SCHED_DEBUG, we're a bit screwed.
Did we end up deciding to remove the CONFIG_DEBUG_MUTEXES=n dependency?
next prev parent reply other threads:[~2009-01-14 20:21 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-12 15:37 [PATCH -v8][RFC] mutex: implement adaptive spinning Peter Zijlstra
2009-01-12 16:04 ` Linus Torvalds
2009-01-12 16:20 ` Linus Torvalds
2009-01-12 16:45 ` Chris Mason
2009-01-12 16:50 ` Peter Zijlstra
2009-01-12 17:14 ` Chris Mason
2009-01-12 17:24 ` Peter Zijlstra
2009-01-12 17:30 ` Chris Mason
2009-01-12 17:16 ` Peter Zijlstra
2009-01-12 17:33 ` Boaz Harrosh
2009-01-12 18:07 ` Peter Zijlstra
2009-01-12 16:13 ` Avi Kivity
2009-01-12 17:13 ` Peter Zijlstra
2009-01-12 17:23 ` Avi Kivity
2009-01-12 17:32 ` Avi Kivity
2009-01-14 16:46 ` Peter Zijlstra
2009-01-14 17:04 ` Nick Piggin
2009-01-14 17:23 ` Avi Kivity
2009-01-15 0:50 ` Nick Piggin
2009-01-13 15:15 ` [PATCH -v9][RFC] " Peter Zijlstra
2009-01-13 16:16 ` Linus Torvalds
2009-01-13 16:21 ` Peter Zijlstra
2009-01-13 16:39 ` Ingo Molnar
2009-01-13 16:40 ` Peter Zijlstra
2009-01-13 16:49 ` Linus Torvalds
2009-01-13 17:21 ` Peter Zijlstra
2009-01-13 18:33 ` Ingo Molnar
2009-01-13 18:40 ` Linus Torvalds
2009-01-13 19:01 ` Ingo Molnar
2009-01-14 2:58 ` Chris Mason
2009-01-14 11:18 ` Dmitry Adamushko
2009-01-14 16:47 ` Chris Mason
2009-01-14 17:32 ` Dmitry Adamushko
2009-01-14 11:21 ` Ingo Molnar
2009-01-14 15:43 ` Linus Torvalds
2009-01-14 16:23 ` Chris Mason
2009-01-14 17:06 ` [PATCH -v11 delta] " Ingo Molnar
2009-01-14 17:00 ` [PATCH -v11][RFC] " Peter Zijlstra
2009-01-14 17:18 ` Nick Piggin
2009-01-14 17:22 ` Peter Zijlstra
2009-01-15 0:46 ` Nick Piggin
2009-01-15 7:44 ` Peter Zijlstra
2009-01-15 7:52 ` Nick Piggin
2009-01-14 18:33 ` [GIT PULL] adaptive spinning mutexes Ingo Molnar
2009-01-14 18:40 ` Chris Mason
2009-01-15 9:53 ` Ingo Molnar
2009-01-14 18:47 ` Ingo Molnar
2009-01-14 19:28 ` Ingo Molnar
2009-01-15 17:44 ` Matthew Wilcox
2009-01-15 18:05 ` Linus Torvalds
2009-01-15 18:08 ` Ingo Molnar
2009-01-15 18:16 ` Linus Torvalds
2009-01-15 19:26 ` Chris Mason
2009-01-15 20:13 ` Linus Torvalds
2009-01-15 21:04 ` Chris Mason
2009-01-15 22:03 ` Ingo Molnar
2009-01-16 13:32 ` Folkert van Heusden
2009-01-16 13:32 ` Folkert van Heusden
2009-01-16 13:32 ` Folkert van Heusden
2009-01-16 13:57 ` Folkert van Heusden
2009-01-16 13:57 ` Folkert van Heusden
2009-01-16 13:57 ` Folkert van Heusden
2009-01-16 18:37 ` Bill Davidsen
2009-01-16 18:37 ` Bill Davidsen
2009-01-16 0:53 ` Paul E. McKenney
2009-01-16 1:01 ` Linus Torvalds
2009-01-16 1:34 ` Paul E. McKenney
2009-01-16 14:07 ` Folkert van Heusden
2009-01-16 3:03 ` Nick Piggin
2009-01-15 18:06 ` Ingo Molnar
2009-01-14 18:53 ` Andrew Morton
2009-01-14 19:00 ` Ingo Molnar
2009-01-14 19:36 ` Andrew Morton
2009-01-14 19:50 ` Peter Zijlstra
2009-01-14 20:21 ` Andrew Morton [this message]
2009-01-14 20:27 ` Ingo Molnar
2009-01-14 20:44 ` Andrew Morton
2009-01-14 20:14 ` Ingo Molnar
2009-01-14 20:30 ` Andrew Morton
2009-01-14 20:51 ` Ingo Molnar
2009-01-14 21:06 ` Andrew Morton
2009-01-14 21:14 ` Ingo Molnar
2009-01-14 21:35 ` Andrew Morton
2009-01-14 23:23 ` Ingo Molnar
2009-01-15 0:55 ` Nick Piggin
2009-01-14 21:41 ` Ingo Molnar
2009-01-14 21:50 ` Kay Sievers
2009-01-14 22:34 ` Ingo Molnar
2009-01-15 11:45 ` Folkert van Heusden
2009-01-15 12:53 ` Chris Samuel
2009-01-14 19:23 ` Peter Zijlstra
2009-01-14 19:33 ` Ingo Molnar
2009-01-15 8:41 ` [PATCH] mutex: set owner only once on acquisition Johannes Weiner
2009-01-15 8:56 ` Johannes Weiner
2009-01-13 18:12 ` [PATCH -v9][RFC] mutex: implement adaptive spinning Ingo Molnar
2009-01-13 18:21 ` Linus Torvalds
2009-01-13 18:24 ` Ingo Molnar
2009-01-14 11:41 ` [PATCH -v8][RFC] " Folkert van Heusden
2009-01-14 11:42 ` Peter Zijlstra
2009-01-14 11:42 ` Folkert van Heusden
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