From: Robert Love <rml@tech9.net>
To: Alexander Viro <viro@math.psu.edu>
Cc: Linus Torvalds <torvalds@transmeta.com>,
Andrew Morton <akpm@zip.com.au>,
Martin Wirth <Martin.Wirth@dlr.de>,
linux-kernel@vger.kernel.org, mingo@elte.hu, haveblue@us.ibm.com
Subject: Re: [RFC] New locking primitive for 2.5
Date: 08 Feb 2002 14:36:26 -0500 [thread overview]
Message-ID: <1013196987.805.153.camel@phantasy> (raw)
In-Reply-To: <Pine.GSO.4.21.0202081416410.28514-100000@weyl.math.psu.edu>
In-Reply-To: <Pine.GSO.4.21.0202081416410.28514-100000@weyl.math.psu.edu>
On Fri, 2002-02-08 at 14:21, Alexander Viro wrote:
> Had anyone actually seen lseek() vs. lseek() contention prior to the
> switch to ->i_sem-based variant?
Yes, I did, even on my 2-way.
Additionally, when I posted the remove-bkl-llseek patch, someone from
SGI noted that on a 24-processor NUMA IA-64 machine, _50%_ of machine
time was spent spinning on the BKL in llseek-intense operations.
The bkl is not held for a long time, but it is acquired often, and there
are definitely workloads that show a big hit with the BKL in there.
Robert Love
next prev parent reply other threads:[~2002-02-08 19:36 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-07 15:38 [RFC] New locking primitive for 2.5 Martin Wirth
2002-02-07 18:04 ` Daniel Phillips
2002-02-07 18:06 ` Richard Gooch
2002-02-07 18:22 ` Christoph Hellwig
2002-02-07 19:33 ` Daniel Phillips
2002-02-07 19:55 ` Mark Frazer
2002-02-08 12:24 ` Denis Vlasenko
2002-02-07 18:40 ` Robert Love
2002-02-07 19:25 ` Andrew Morton
2002-02-07 19:51 ` Dave Hansen
2002-02-07 20:06 ` Andrew Morton
2002-02-07 20:11 ` Robert Love
2002-02-07 21:27 ` Ingo Molnar
2002-02-07 19:59 ` Andrew Morton
2002-02-08 8:20 ` Nigel Gamble
2002-02-08 17:06 ` Larry McVoy
2002-02-07 19:58 ` yodaiken
2002-02-07 20:08 ` Robert Love
2002-02-07 20:15 ` yodaiken
2002-02-07 20:20 ` Robert Love
2002-02-07 20:36 ` yodaiken
2002-02-07 20:57 ` Daniel Phillips
2002-02-07 21:00 ` yodaiken
2002-02-07 21:10 ` Daniel Phillips
2002-02-07 20:49 ` Martin Wirth
2002-02-08 8:34 ` Martin Wirth
2002-02-08 18:28 ` Linus Torvalds
2002-02-08 18:12 ` Martin Wirth
2002-02-08 18:33 ` Alexander Viro
2002-02-08 20:02 ` Linus Torvalds
2002-02-08 18:54 ` Andrew Morton
2002-02-08 19:11 ` Linus Torvalds
2002-02-08 19:21 ` Alexander Viro
2002-02-08 19:36 ` Robert Love [this message]
2002-02-09 0:18 ` Alexander Viro
2002-02-08 21:23 ` Ingo Molnar
2002-02-08 21:36 ` Linus Torvalds
2002-02-08 20:04 ` Jeff Garzik
2002-02-08 21:16 ` Mike Fedyk
2002-02-09 0:09 ` Alan Cox
2002-02-09 0:05 ` Mike Fedyk
2002-02-08 21:40 ` Benjamin Herrenschmidt
2002-02-09 19:32 ` Linus Torvalds
2002-02-07 19:56 ` yodaiken
2002-02-07 22:09 ` Ingo Molnar
2002-02-07 20:31 ` yodaiken
2002-02-07 20:57 ` Andrew Morton
2002-02-07 21:02 ` yodaiken
2002-02-08 12:31 ` Christoph Hellwig
2002-02-08 16:51 ` Nigel Gamble
2002-02-08 18:41 ` Andrew Morton
2002-02-08 20:47 ` Ingo Molnar
2002-02-08 18:56 ` Alexander Viro
2002-02-08 20:59 ` Ingo Molnar
2002-02-08 19:10 ` Alexander Viro
2002-02-08 20:14 ` Anton Altaparmakov
2002-02-08 20:38 ` yodaiken
2002-02-08 21:55 ` Anton Altaparmakov
2002-02-08 12:47 ` Denis Vlasenko
2002-02-08 15:13 ` yodaiken
2002-02-08 19:22 ` Horst von Brand
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