From: Andrew Morton <akpm@zip.com.au>
To: Daniel Phillips <phillips@arcor.de>
Cc: Christian Ehrhardt <ehrhardt@mathematik.uni-ulm.de>,
Linus Torvalds <torvalds@transmeta.com>,
Marcelo Tosatti <marcelo@conectiva.com.br>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC] [PATCH] Include LRU in page count
Date: Sun, 01 Sep 2002 15:09:36 -0700 [thread overview]
Message-ID: <3D729020.4DFDAC2B@zip.com.au> (raw)
In-Reply-To: 20020901212943Z16578-4014+1360@humbolt.nl.linux.org
Daniel Phillips wrote:
>
> ...
> I'm looking at your spinlock_irq now and thinking the _irq part could
> possibly be avoided. Can you please remind me of the motivation for this -
> was it originally intended to address the same race we've been working on
> here?
>
scalability, mainly. If the CPU holding the lock takes an interrupt,
all the other CPUs get to spin until the handler completes. I measured
a 30% reducton in contention from this.
Not a generally justifiable trick, but this is a heavily-used lock.
All the new games in refill_inactive() are there to minimise the
interrupt-off time.
next prev parent reply other threads:[~2002-09-01 21:53 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-22 2:29 MM patches against 2.5.31 Andrew Morton
2002-08-22 2:29 ` Andrew Morton
2002-08-22 11:28 ` Christian Ehrhardt
2002-08-22 11:28 ` Christian Ehrhardt
2002-08-26 1:52 ` Andrew Morton
2002-08-26 1:52 ` Andrew Morton
2002-08-26 9:10 ` Christian Ehrhardt
2002-08-26 9:10 ` Christian Ehrhardt
2002-08-26 14:22 ` Daniel Phillips
2002-08-26 14:22 ` Daniel Phillips
2002-08-26 15:29 ` Christian Ehrhardt
2002-08-26 15:29 ` Christian Ehrhardt
2002-08-26 17:56 ` Daniel Phillips
2002-08-26 17:56 ` Daniel Phillips
2002-08-26 19:24 ` Andrew Morton
2002-08-26 19:24 ` Andrew Morton
2002-08-26 19:34 ` Daniel Phillips
2002-08-26 19:34 ` Daniel Phillips
2002-08-26 19:48 ` Christian Ehrhardt
2002-08-26 19:48 ` Christian Ehrhardt
2002-08-27 9:22 ` Christian Ehrhardt
2002-08-27 9:22 ` Christian Ehrhardt
2002-08-27 19:19 ` Andrew Morton
2002-08-27 19:19 ` Andrew Morton
2002-08-26 20:00 ` Christian Ehrhardt
2002-08-26 20:00 ` Christian Ehrhardt
2002-08-26 20:09 ` Daniel Phillips
2002-08-26 20:09 ` Daniel Phillips
2002-08-26 20:58 ` Christian Ehrhardt
2002-08-26 20:58 ` Christian Ehrhardt
2002-08-27 16:48 ` Daniel Phillips
2002-08-27 16:48 ` Daniel Phillips
2002-08-28 13:14 ` Christian Ehrhardt
2002-08-28 13:14 ` Christian Ehrhardt
2002-08-28 17:18 ` Daniel Phillips
2002-08-28 17:18 ` Daniel Phillips
2002-08-28 17:42 ` Andrew Morton
2002-08-28 17:42 ` Andrew Morton
2002-08-28 20:41 ` Daniel Phillips
2002-08-28 20:41 ` Daniel Phillips
2002-08-28 21:03 ` Andrew Morton
2002-08-28 21:03 ` Andrew Morton
2002-08-28 22:04 ` Daniel Phillips
2002-08-28 22:04 ` Daniel Phillips
2002-08-28 22:39 ` Andrew Morton
2002-08-28 22:39 ` Andrew Morton
2002-08-28 22:57 ` Daniel Phillips
2002-08-28 22:57 ` Daniel Phillips
2002-08-26 21:31 ` Andrew Morton
2002-08-26 21:31 ` Andrew Morton
2002-08-27 3:42 ` Benjamin LaHaise
2002-08-27 3:42 ` Benjamin LaHaise
2002-08-27 4:37 ` Andrew Morton
2002-08-27 4:37 ` Andrew Morton
2002-08-26 17:58 ` Linus Torvalds
2002-08-26 19:28 ` Rik van Riel
2002-08-30 23:03 ` [RFC] [PATCH] Include LRU in page count Daniel Phillips
2002-08-31 16:14 ` Christian Ehrhardt
2002-08-31 17:54 ` Andrew Morton
2002-08-31 19:47 ` Daniel Phillips
2002-08-31 20:26 ` Andrew Morton
2002-08-31 21:05 ` Daniel Phillips
2002-08-31 22:30 ` William Lee Irwin III
2002-09-01 3:36 ` Daniel Phillips
2002-09-01 21:32 ` Daniel Phillips
2002-09-01 22:09 ` Andrew Morton [this message]
2002-09-01 22:08 ` Daniel Phillips
2002-09-01 22:20 ` Daniel Phillips
2002-09-01 23:08 ` Andrew Morton
2002-09-01 23:19 ` Daniel Phillips
2002-09-01 23:28 ` William Lee Irwin III
2002-09-01 23:33 ` Daniel Phillips
2002-09-02 0:17 ` Andrew Morton
2002-09-02 0:30 ` Daniel Phillips
2002-09-02 1:50 ` Andrew Morton
2002-09-02 1:08 ` Rik van Riel
2002-09-02 17:23 ` Christian Ehrhardt
2002-09-02 18:01 ` Daniel Phillips
2002-09-05 4:42 ` [RFC] Alternative raceless page free Daniel Phillips
2002-09-05 12:34 ` Christian Ehrhardt
2002-09-05 15:21 ` Daniel Phillips
2002-09-05 16:04 ` Christian Ehrhardt
2002-09-05 16:10 ` Daniel Phillips
2002-09-05 16:31 ` Daniel Phillips
2002-09-05 18:06 ` [RFC] Alternative raceless page free, updated Daniel Phillips
2002-08-22 15:59 ` MM patches against 2.5.31 Steven Cole
2002-08-22 15:59 ` Steven Cole
2002-08-22 16:06 ` Martin J. Bligh
2002-08-22 16:06 ` Martin J. Bligh
2002-08-22 19:45 ` Steven Cole
2002-08-22 19:45 ` Steven Cole
2002-08-26 2:15 ` Andrew Morton
2002-08-26 2:15 ` Andrew Morton
2002-08-26 2:08 ` Martin J. Bligh
2002-08-26 2:08 ` Martin J. Bligh
2002-08-26 2:32 ` Andrew Morton
2002-08-26 2:32 ` Andrew Morton
2002-08-26 3:06 ` Steven Cole
2002-08-26 3:06 ` Steven Cole
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