From: ebiederm@xmission.com (Eric W. Biederman)
To: Andrea Arcangeli <andrea@suse.de>
Cc: Alexander Viro <viro@math.psu.edu>,
Linus Torvalds <torvalds@transmeta.com>,
linux-kernel@vger.kernel.org
Subject: Re: negative dentries wasting ram
Date: 26 May 2002 02:06:55 -0600 [thread overview]
Message-ID: <m14rgvz61s.fsf@frodo.biederman.org> (raw)
In-Reply-To: <20020524163942.GB15703@dualathlon.random> <Pine.GSO.4.21.0205241300480.9792-100000@weyl.math.psu.edu> <20020524175522.GD15703@dualathlon.random>
Andrea Arcangeli <andrea@suse.de> writes:
>
> Anyways in 2.5 we could still take advantage of the negative dentries as
> much as possible (also after unlink) by moving the negative dentries
> into a separate list and by putting the shrinkage of this list in front
> of kmem_cache_reap, so we are as efficient as possible, but we don't
> risk throwing away very useful cache, for more dubious caching effects
> after an unlink/create-failure that currently have the side effect of
> throwing away tons of worthwhile positive pagecache (and even triggering
> swap false positives) in some workloads.
Right treat the new never referenced negative dentries as second class
citizens until someone comes along and uses them, instead of aged useful
cache entries. This sounds like a very good solution to this.
Eric
next prev parent reply other threads:[~2002-05-26 8:16 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-24 7:16 negative dentries wasting ram Andrea Arcangeli
2002-05-24 8:10 ` Andreas Dilger
2002-05-24 15:36 ` Andrea Arcangeli
2002-05-24 16:12 ` Alexander Viro
2002-05-24 16:21 ` Andrea Arcangeli
2002-05-24 16:24 ` Alexander Viro
2002-05-24 14:43 ` Linus Torvalds
2002-05-24 14:51 ` David S. Miller
2002-05-24 14:53 ` Jakub Jelinek
2002-05-24 20:44 ` David Schwartz
2002-05-25 17:33 ` Florian Weimer
2002-05-24 15:54 ` Andrea Arcangeli
2002-05-24 16:22 ` Alexander Viro
2002-05-24 16:29 ` Linus Torvalds
2002-05-24 16:39 ` Andrea Arcangeli
2002-05-24 17:04 ` Alexander Viro
2002-05-24 17:06 ` Alexander Viro
2002-05-24 17:55 ` Andrea Arcangeli
2002-05-24 18:00 ` Alexander Viro
2002-05-24 18:58 ` Andrea Arcangeli
2002-05-24 19:04 ` Alexander Viro
2002-05-24 19:43 ` Andrea Arcangeli
2002-05-24 19:55 ` Alexander Viro
2002-05-24 20:36 ` Andrea Arcangeli
2002-05-24 22:14 ` Jan Harkes
2002-05-24 22:31 ` Andrea Arcangeli
2002-05-26 8:06 ` Eric W. Biederman [this message]
2002-05-24 17:00 ` Alexander Viro
2002-05-24 18:36 ` Mark Mielke
2002-05-31 8:34 ` Oliver Neukum
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