From: Ingo Molnar <mingo@elte.hu>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: torvalds@linux-foundation.org, matthew@wil.cx,
rostedt@goodmis.org, peterz@infradead.org,
paulmck@linux.vnet.ibm.com, ghaskins@novell.com,
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
Subject: Re: [PATCH -v5][RFC]: mutex: implement adaptive spinning
Date: Wed, 7 Jan 2009 22:57:59 +0100 [thread overview]
Message-ID: <20090107215759.GA17917@elte.hu> (raw)
In-Reply-To: <20090107134715.9c5e139e.akpm@linux-foundation.org>
* Andrew Morton <akpm@linux-foundation.org> wrote:
> On Wed, 7 Jan 2009 22:32:22 +0100
> Ingo Molnar <mingo@elte.hu> wrote:
>
> > > We could do the whole "oldfs = get_fs(); set_fs(KERNEL_DS); ..
> > > set_fs(oldfs);" crud, but it would probably be better to just add an
> > > architected accessor. Especially since it's going to generally just be a
> > >
> > > #define get_kernel_careful(val,p) __get_user(val,p)
> > >
> > > for most architectures.
> > >
> > > We've needed that before (and yes, we've simply mis-used __get_user() on
> > > x86 before rather than add it).
> >
> > for the oldfs stuff we already have probe_kernel_read(). OTOH, that
> > involves pagefault_disable() which is an atomic op
>
> tisn't. pagefault_disable() is just preempt_count()+=1;barrier() ?
okay. Not an atomic (which is plenty fast on Nehalem with 20 cycles
anyway), but probe_kernel_read() is expensive nevertheless:
ffffffff8027c092 <probe_kernel_read>:
ffffffff8027c092: 65 48 8b 04 25 10 00 mov %gs:0x10,%rax
ffffffff8027c099: 00 00
ffffffff8027c09b: 53 push %rbx
ffffffff8027c09c: 48 8b 98 48 e0 ff ff mov -0x1fb8(%rax),%rbx
ffffffff8027c0a3: 48 c7 80 48 e0 ff ff movq $0xffffffffffffffff,-0x1fb8(%rax)
ffffffff8027c0aa: ff ff ff ff
ffffffff8027c0ae: 65 48 8b 04 25 10 00 mov %gs:0x10,%rax
ffffffff8027c0b5: 00 00
ffffffff8027c0b7: ff 80 44 e0 ff ff incl -0x1fbc(%rax)
ffffffff8027c0bd: e8 0e dd 0d 00 callq ffffffff80359dd0 <__copy_from_user_inatomic>
ffffffff8027c0c2: 65 48 8b 14 25 10 00 mov %gs:0x10,%rdx
ffffffff8027c0c9: 00 00
ffffffff8027c0cb: ff 8a 44 e0 ff ff decl -0x1fbc(%rdx)
ffffffff8027c0d1: 65 48 8b 14 25 10 00 mov %gs:0x10,%rdx
ffffffff8027c0d8: 00 00
ffffffff8027c0da: 48 83 f8 01 cmp $0x1,%rax
ffffffff8027c0de: 48 89 9a 48 e0 ff ff mov %rbx,-0x1fb8(%rdx)
ffffffff8027c0e5: 48 19 c0 sbb %rax,%rax
ffffffff8027c0e8: 48 f7 d0 not %rax
ffffffff8027c0eb: 48 83 e0 f2 and $0xfffffffffffffff2,%rax
ffffffff8027c0ef: 5b pop %rbx
ffffffff8027c0f0: c3 retq
ffffffff8027c0f1: 90 nop
where __copy_user_inatomic() goes into the full __copy_generic_unrolled().
Not pretty.
> Am suspecting that you guys might be over-optimising this
> contended-path-were-going-to-spin-anyway code?
not sure. Especially for 'good' locking usage - where there are shortly
held locks and the spin times are short, the average time to get _out_ of
the spinning section is a kind of secondary fastpath as well.
Ingo
next prev parent reply other threads:[~2009-01-07 21:57 UTC|newest]
Thread overview: 362+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-31 11:28 Btrfs for mainline Chris Mason
2008-12-31 18:45 ` Andrew Morton
2008-12-31 23:19 ` Chris Mason
2009-01-02 16:37 ` Ryusuke Konishi
2009-01-02 18:06 ` Chris Mason
2009-01-02 19:38 ` Chris Mason
2009-01-03 9:44 ` Ryusuke Konishi
2009-01-05 14:14 ` Chris Mason
2009-01-05 16:43 ` Ryusuke Konishi
2009-01-05 10:32 ` Nick Piggin
2009-01-05 13:21 ` Chris Mason
2009-01-05 14:39 ` generic pagecache to block mapping layer (was Re: Btrfs for mainline) Nick Piggin
2009-01-05 16:37 ` Chris Mason
2009-01-05 17:10 ` Nick Piggin
2009-01-06 17:20 ` Nick Piggin
2009-01-02 19:05 ` Btrfs for mainline Andi Kleen
2009-01-02 19:32 ` Chris Mason
2009-01-02 21:01 ` Andi Kleen
2009-01-02 21:35 ` Chris Mason
2009-01-02 22:26 ` Roland Dreier
2009-01-04 13:28 ` KOSAKI Motohiro
2009-01-04 15:56 ` Ed Tomlinson
2009-01-05 10:07 ` Chris Samuel
2009-01-05 13:18 ` Chris Mason
2009-01-05 16:33 ` J. Bruce Fields
2009-01-06 22:09 ` Jamie Lokier
2009-01-03 19:17 ` Matthew Wilcox
2009-01-03 19:50 ` Christoph Hellwig
2009-01-03 20:17 ` Chris Mason
2009-01-04 21:52 ` Arnd Bergmann
2009-01-05 14:01 ` Chris Mason
2009-01-03 21:12 ` Matthew Wilcox
2009-01-04 18:21 ` Peter Zijlstra
2009-01-04 18:41 ` Matthew Wilcox
2009-01-05 14:47 ` Nick Piggin
2009-01-05 16:23 ` Matthew Wilcox
2009-01-05 16:30 ` Chris Mason
2009-01-07 13:07 ` Ingo Molnar
2009-01-07 13:24 ` Matthew Wilcox
2009-01-07 14:56 ` Ingo Molnar
2009-01-06 11:40 ` [PATCH][RFC]: mutex: adaptive spin Peter Zijlstra
2009-01-06 12:10 ` Ingo Molnar
2009-01-06 12:21 ` Peter Zijlstra
2009-01-06 15:01 ` Matthew Wilcox
2009-01-06 13:10 ` Gregory Haskins
2009-01-06 13:16 ` Ingo Molnar
2009-01-06 13:20 ` Peter Zijlstra
2009-01-06 14:15 ` Gregory Haskins
2009-01-06 21:42 ` Paul E. McKenney
2009-01-06 21:44 ` Peter Zijlstra
2009-01-06 21:50 ` Linus Torvalds
2009-01-06 22:07 ` Peter Zijlstra
2009-01-06 22:22 ` Linus Torvalds
2009-01-06 22:43 ` Peter Zijlstra
2009-01-06 22:56 ` Linus Torvalds
2009-01-06 23:00 ` Linus Torvalds
2009-01-06 23:09 ` Matthew Wilcox
2009-01-07 0:06 ` Linus Torvalds
2009-01-06 23:16 ` Peter Zijlstra
2009-01-07 12:03 ` [PATCH -v4][RFC]: mutex: implement adaptive spinning Peter Zijlstra
2009-01-07 14:50 ` Frédéric Weisbecker
2009-01-07 14:58 ` Peter Zijlstra
2009-01-07 15:22 ` Steven Rostedt
2009-01-07 15:29 ` Steven Rostedt
2009-01-07 15:54 ` Peter Zijlstra
2009-01-07 16:25 ` Linus Torvalds
2009-01-07 16:57 ` [PATCH -v5][RFC]: " Peter Zijlstra
2009-01-07 18:55 ` Linus Torvalds
2009-01-07 20:40 ` Steven Rostedt
2009-01-07 20:55 ` Linus Torvalds
2009-01-07 21:09 ` Matthew Wilcox
2009-01-07 21:24 ` Linus Torvalds
2009-01-07 21:32 ` Ingo Molnar
2009-01-07 21:47 ` Andrew Morton
2009-01-07 21:57 ` Ingo Molnar [this message]
2009-01-07 21:39 ` Linus Torvalds
2009-01-07 21:39 ` Andi Kleen
2009-01-07 22:28 ` Gregory Haskins
2009-01-07 22:33 ` Ingo Molnar
2009-01-07 22:51 ` Peter W. Morreale
2009-01-07 23:14 ` Peter W. Morreale
2009-01-07 22:56 ` Gregory Haskins
2009-01-07 23:09 ` Steven Rostedt
2009-01-07 23:32 ` Linus Torvalds
2009-01-07 23:46 ` Steven Rostedt
2009-01-07 23:47 ` Steven Rostedt
2009-01-07 23:52 ` Linus Torvalds
2009-01-08 3:28 ` Gregory Haskins
2009-01-08 7:10 ` Peter Zijlstra
2009-01-07 23:15 ` Linus Torvalds
2009-01-07 23:18 ` Linus Torvalds
2009-01-08 3:27 ` Gregory Haskins
2009-01-08 3:38 ` Steven Rostedt
2009-01-08 4:00 ` Gregory Haskins
2009-01-07 23:23 ` Paul E. McKenney
2009-01-07 21:28 ` Ingo Molnar
2009-01-07 21:51 ` Peter Zijlstra
2009-01-07 21:58 ` Linus Torvalds
2009-01-07 22:06 ` Linus Torvalds
2009-01-07 22:18 ` Peter Zijlstra
2009-01-07 23:10 ` Linus Torvalds
2009-01-08 9:58 ` [PATCH -v6][RFC]: " Peter Zijlstra
2009-01-08 14:18 ` Ingo Molnar
2009-01-08 14:33 ` Gregory Haskins
2009-01-08 14:46 ` [PATCH -v7][RFC]: " Peter Zijlstra
2009-01-08 15:09 ` Steven Rostedt
2009-01-08 15:23 ` Peter Zijlstra
2009-01-08 15:28 ` Steven Rostedt
2009-01-08 15:30 ` Peter Zijlstra
2009-01-08 15:30 ` Steven Rostedt
2009-01-08 16:11 ` Linus Torvalds
2009-01-08 16:58 ` Linus Torvalds
2009-01-08 17:08 ` Chris Mason
2009-01-08 17:33 ` Steven Rostedt
2009-01-08 17:52 ` Linus Torvalds
2009-01-08 18:03 ` Steven Rostedt
[not found] ` <alpine.DEB.1.10.0901081300370.24688@gandalf.stny.rr.com>
2009-01-08 18:14 ` Steven Rostedt
2009-01-08 19:17 ` Chris Mason
2009-01-08 19:45 ` Steven Rostedt
2009-01-08 18:16 ` Linus Torvalds
2009-01-08 18:27 ` Chris Mason
2009-01-08 19:02 ` Chris Mason
2009-01-08 19:13 ` Linus Torvalds
2009-01-08 19:23 ` Peter Zijlstra
2009-01-09 17:40 ` Jiri Kosina
2009-01-09 9:28 ` Peter Zijlstra
2009-01-10 23:59 ` Jeremy Fitzhardinge
2009-01-08 19:54 ` Linus Torvalds
2009-01-08 20:12 ` Steven Rostedt
2009-01-09 10:47 ` Peter Zijlstra
2009-01-09 15:06 ` Peter Zijlstra
2009-01-09 15:11 ` Chris Mason
2009-01-09 15:59 ` Steven Rostedt
2009-01-09 16:03 ` Peter Zijlstra
2009-01-09 16:34 ` Linus Torvalds
2009-01-09 16:44 ` Steven Rostedt
2009-01-09 18:16 ` Peter Zijlstra
2009-01-09 18:24 ` Linus Torvalds
2009-01-08 18:00 ` Linus Torvalds
2009-01-08 18:33 ` Ingo Molnar
2009-01-08 18:41 ` H. Peter Anvin
2009-01-09 3:46 ` Linus Torvalds
2009-01-09 4:59 ` David Miller
2009-01-09 5:00 ` H. Peter Anvin
2009-01-09 13:00 ` [patch] measurements, numbers about CONFIG_OPTIMIZE_INLINING=y impact Ingo Molnar
2009-01-09 14:03 ` jim owens
2009-01-09 15:35 ` Ingo Molnar
2009-01-09 16:28 ` Linus Torvalds
2009-01-09 19:56 ` H. Peter Anvin
2009-01-10 8:55 ` Chris Samuel
2009-01-09 20:17 ` Nicholas Miell
2009-01-09 20:29 ` Linus Torvalds
2009-01-09 23:28 ` Nicholas Miell
2009-01-10 0:05 ` Linus Torvalds
2009-01-10 0:37 ` Andi Kleen
2009-01-10 0:41 ` Linus Torvalds
2009-01-10 1:08 ` Andi Kleen
2009-01-10 2:12 ` Nicholas Miell
2009-01-10 4:05 ` Linus Torvalds
2009-01-10 6:44 ` Nicholas Miell
2009-01-09 20:29 ` Steven Rostedt
2009-01-09 16:34 ` H. Peter Anvin
2009-01-09 16:44 ` Linus Torvalds
2009-01-09 16:47 ` Dirk Hohndel
2009-01-09 16:46 ` Dirk Hohndel
2009-01-09 16:51 ` H. Peter Anvin
2009-01-09 17:07 ` Steven Rostedt
2009-01-09 17:14 ` Linus Torvalds
2009-01-09 17:32 ` Andi Kleen
2009-01-09 17:20 ` Andi Kleen
2009-01-09 17:11 ` Linus Torvalds
2009-01-09 17:46 ` Andi Kleen
2009-01-09 17:28 ` Matthew Wilcox
2009-01-09 17:47 ` Andi Kleen
2009-01-09 17:39 ` Matthew Wilcox
2009-01-09 17:54 ` Linus Torvalds
2009-01-09 18:07 ` H. Peter Anvin
2009-01-09 18:19 ` Andi Kleen
2009-01-09 18:59 ` Richard Guenther
2009-01-09 19:13 ` H. Peter Anvin
2009-01-09 19:21 ` Andi Kleen
2009-01-09 19:10 ` Richard Guenther
2009-01-09 19:17 ` H. Peter Anvin
2009-01-09 19:40 ` Andi Kleen
2009-01-09 19:32 ` Richard Guenther
2009-01-09 19:09 ` Richard Guenther
2009-01-09 19:44 ` Linus Torvalds
2009-01-09 20:14 ` Richard Guenther
2009-01-09 20:26 ` Linus Torvalds
2009-01-09 20:37 ` Richard Guenther
2009-01-09 21:23 ` Theodore Tso
2009-01-09 21:33 ` Steven Rostedt
2009-01-09 20:58 ` Sam Ravnborg
2009-01-09 17:41 ` Dirk Hohndel
2009-01-09 18:02 ` Andi Kleen
2009-01-09 17:57 ` Linus Torvalds
2009-01-09 18:55 ` Andi Kleen
2009-01-09 19:00 ` Linus Torvalds
2009-01-09 19:35 ` Andi Kleen
2009-01-09 19:29 ` Matthew Wilcox
2009-01-09 19:48 ` Linus Torvalds
2009-01-09 19:52 ` Theodore Tso
2009-01-09 22:07 ` Arjan van de Ven
2009-01-09 22:44 ` Andi Kleen
[not found] ` <20090109224410.GQ26290@one.firstfloor.org>
2009-01-09 22:35 ` H. Peter Anvin
2009-01-09 22:55 ` Arjan van de Ven
2009-01-09 23:32 ` Sam Ravnborg
2009-01-10 5:29 ` Arjan van de Ven
2009-01-10 5:57 ` H. Peter Anvin
2009-01-11 22:45 ` Valdis.Kletnieks
2009-01-09 17:13 ` Christoph Hellwig
2009-01-09 15:25 ` Ingo Molnar
2009-01-08 19:00 ` [PATCH -v7][RFC]: mutex: implement adaptive spinning Andi Kleen
2009-01-09 1:42 ` H. Peter Anvin
2009-01-09 13:37 ` Ingo Molnar
2009-01-09 16:09 ` Linus Torvalds
2009-01-09 16:23 ` H. Peter Anvin
2009-01-09 16:37 ` Linus Torvalds
2009-01-09 20:41 ` Ingo Molnar
2009-01-09 20:56 ` Ingo Molnar
2009-01-09 20:56 ` Linus Torvalds
2009-01-09 21:34 ` Ingo Molnar
2009-01-09 21:41 ` Harvey Harrison
2009-01-09 21:50 ` Linus Torvalds
2009-01-09 21:59 ` Harvey Harrison
2009-01-09 22:09 ` Linus Torvalds
2009-01-09 22:13 ` Harvey Harrison
2009-01-09 22:25 ` Harvey Harrison
2009-01-10 0:53 ` Jamie Lokier
2009-01-10 1:04 ` Linus Torvalds
2009-01-10 1:13 ` Andi Kleen
2009-01-09 23:12 ` Ingo Molnar
2009-01-09 23:24 ` Linus Torvalds
2009-01-10 1:01 ` Ingo Molnar
2009-01-10 1:06 ` Linus Torvalds
2009-01-10 1:20 ` Ingo Molnar
2009-01-10 1:34 ` Linus Torvalds
2009-01-10 1:08 ` Harvey Harrison
2009-01-10 1:30 ` Linus Torvalds
2009-01-10 5:03 ` H. Peter Anvin
2009-01-10 5:28 ` Linus Torvalds
2009-01-10 5:57 ` H. Peter Anvin
2009-01-11 0:54 ` Ingo Molnar
2009-01-12 1:56 ` Jamie Lokier
2009-01-12 8:40 ` Ingo Molnar
2009-01-10 1:18 ` Steven Rostedt
2009-01-10 1:39 ` Linus Torvalds
2009-01-10 1:41 ` Andrew Morton
2009-01-10 3:02 ` Andi Kleen
2009-01-11 12:26 ` David Woodhouse
2009-01-11 18:13 ` Andi Kleen
2009-01-11 19:25 ` Linus Torvalds
2009-01-11 20:14 ` gcc inlining heuristics was " Andi Kleen
2009-01-11 20:15 ` David Woodhouse
2009-01-11 20:34 ` Andi Kleen
2009-01-11 20:51 ` Linus Torvalds
2009-01-11 23:05 ` Linus Torvalds
2009-01-12 0:12 ` Andi Kleen
2009-01-12 0:21 ` Linus Torvalds
2009-01-12 0:52 ` Andi Kleen
2009-01-12 1:20 ` H. Peter Anvin
2009-01-12 18:06 ` Bernd Schmidt
2009-01-12 19:02 ` Linus Torvalds
2009-01-12 19:32 ` Andi Kleen
2009-01-12 19:22 ` H. Peter Anvin
2009-01-12 19:45 ` Linus Torvalds
2009-01-12 23:01 ` Jamie Lokier
2009-01-12 23:19 ` Linus Torvalds
2009-01-12 19:42 ` Linus Torvalds
[not found] ` <alpine.LFD.2.00.0901121128080.6528@localhost.localdomain>
2009-01-12 20:08 ` Linus Torvalds
2009-01-12 22:03 ` Bernd Schmidt
2009-01-13 0:21 ` Linus Torvalds
2009-01-13 1:30 ` Steven Rostedt
2009-01-19 0:13 ` Ingo Molnar
2009-01-19 6:22 ` Nick Piggin
2009-01-19 21:01 ` Linus Torvalds
2009-01-20 0:51 ` Nick Piggin
2009-01-20 12:38 ` Ingo Molnar
2009-01-20 19:49 ` David Woodhouse
2009-01-20 21:05 ` Ingo Molnar
2009-01-20 21:23 ` Linus Torvalds
2009-01-20 22:05 ` Ingo Molnar
2009-01-21 1:22 ` H. Peter Anvin
2009-01-21 8:54 ` Andi Kleen
2009-01-21 8:52 ` Nick Piggin
2009-01-21 9:20 ` Andi Kleen
2009-01-21 9:25 ` Nick Piggin
2009-01-21 9:54 ` Andi Kleen
2009-01-21 10:14 ` Nick Piggin
2009-01-20 4:20 ` Andi Kleen
2009-01-20 17:43 ` Miguel F Mascarenhas Sousa Filipe
2009-01-12 19:55 ` Bernd Schmidt
2009-01-12 20:11 ` Linus Torvalds
2009-01-12 7:59 ` Hard to debug kernel issues (was Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning) Chris Samuel
2009-01-10 6:44 ` [PATCH -v7][RFC]: mutex: implement adaptive spinning H. Peter Anvin
2009-01-09 21:46 ` Linus Torvalds
2009-01-09 21:58 ` Ingo Molnar
2009-01-09 21:15 ` Andi Kleen
2009-01-08 19:59 ` Harvey Harrison
2009-01-09 1:44 ` H. Peter Anvin
2009-01-09 2:24 ` Harvey Harrison
2009-01-09 5:05 ` H. Peter Anvin
2009-01-09 3:35 ` Andi Kleen
2009-01-09 3:42 ` Linus Torvalds
2009-01-09 6:57 ` Andi Kleen
2009-01-09 6:00 ` Andrew Morton
2009-01-09 6:58 ` Andi Kleen
2009-01-09 13:05 ` Chris Mason
2009-01-08 17:23 ` Peter Zijlstra
2009-01-07 22:54 ` [PATCH -v5][RFC]: " Dave Kleikamp
2009-01-07 23:19 ` Linus Torvalds
2009-01-07 23:49 ` Steven Rostedt
2009-01-07 23:57 ` Linus Torvalds
2009-01-08 2:18 ` KAMEZAWA Hiroyuki
2009-01-08 2:33 ` Steven Rostedt
2009-01-08 2:49 ` KAMEZAWA Hiroyuki
2009-01-08 6:52 ` Andi Kleen
2009-01-08 14:24 ` Steven Rostedt
2009-01-08 14:45 ` Andi Kleen
2009-01-07 21:37 ` Andi Kleen
2009-01-07 21:35 ` Andrew Morton
2009-01-07 17:20 ` [PATCH -v4][RFC]: " Chris Mason
2009-01-07 17:50 ` Linus Torvalds
2009-01-07 18:00 ` Chris Mason
2009-01-07 3:57 ` [PATCH][RFC]: mutex: adaptive spin Lai Jiangshan
2009-01-07 6:32 ` Peter Zijlstra
2009-01-07 7:34 ` Lai Jiangshan
2009-01-07 13:35 ` Matthew Wilcox
2009-01-06 22:31 ` Paul E. McKenney
2009-01-06 15:55 ` Linus Torvalds
2009-01-06 16:11 ` Linus Torvalds
2009-01-06 16:28 ` Steven Rostedt
2009-01-06 16:40 ` Linus Torvalds
2009-01-06 16:42 ` Linus Torvalds
2009-01-06 17:02 ` Ingo Molnar
2009-01-06 16:54 ` Ingo Molnar
2009-01-06 16:56 ` Ingo Molnar
2009-01-06 16:59 ` Linus Torvalds
2009-01-06 16:19 ` Chris Mason
2009-01-10 17:52 ` Pavel Machek
2009-01-06 13:29 ` Nick Piggin
2009-01-06 16:23 ` Chris Mason
2009-01-06 17:08 ` Andrew Morton
2009-01-06 17:37 ` Steven Rostedt
2009-01-06 18:02 ` Linus Torvalds
2009-01-06 18:20 ` Steven Rostedt
2009-01-06 18:28 ` Linus Torvalds
2009-01-06 18:25 ` Linus Torvalds
2009-01-06 19:03 ` Steven Rostedt
2009-01-05 14:34 ` Btrfs for mainline Chris Mason
2009-01-04 8:32 ` Gabor MICSKO
2009-01-05 14:35 ` Chris Mason
2009-01-05 15:01 ` Tomasz Torcz
2009-01-05 16:30 ` Chris Mason
2009-01-06 19:41 ` Chris Mason
2009-01-07 9:33 ` David Woodhouse
2009-01-07 18:45 ` Chris Mason
2009-01-08 20:15 ` jim owens
2009-01-11 23:34 ` Andrew Morton
2009-01-12 13:58 ` Chris Mason
2009-01-12 15:14 ` Miguel Figueiredo Mascarenhas Sousa Filipe
2009-01-12 15:17 ` Chris Mason
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