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From: Mike Waychison <Michael.Waychison@Sun.COM>
To: William Lee Irwin III <>
Cc: Linux kernel <>,
Subject: Re: [patch] Per-sb s_all_inodes list
Date: Mon, 10 Jan 2005 21:08:01 -0500	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Hash: SHA1

William Lee Irwin III wrote:
> On Mon, Jan 10, 2005 at 04:19:24PM -0500, Mike Waychison wrote:
>>Releasing a super_block requires walking all inodes for the given
>>superblock and releasing them. Currently, inodes are found on one of
>>four lists:
> [...]
>>The second list, inode_unused can potentially be quite large.
>>Unfortunately, it cannot be made per-sb as it is the global LRU list
>>used for inode cache reduction under memory pressure.
>>When unmounting a single filesystem, profiling shows dramatic time spent
>>walking inode_unused.  This because very noticeble when one is
>>unmounting a decently sized tree of filesystems.
>>The proposed solution is to create a new list per-sb, that contains all
>>inodes allocated.  It is maintained under the inode_lock for the sake of
>>simplicity, but this may prove unneccesary, and may be better done with
>>another global or per-sb lock.
> I thought this was a good idea a number of months ago myself when I saw
> a patch for 2.4.x implementing this from Kirill Korotaev, so I ported
> that code to 2.6.x and it got merged in -mm then. That patch was merged
> into Linus' bk shortly after 2.6.10. Could you check Linus' bk to see
> if what made it there resolves the issue as well as your own?

Excellent.  I eyeballed the patch on and it does exactly what
I posted.


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Mike Waychison
Sun Microsystems, Inc.
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      reply	other threads:[~2005-01-11  2:15 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-01-10 21:19 [patch] Per-sb s_all_inodes list Mike Waychison
2005-01-11  1:23 ` William Lee Irwin III
2005-01-11  2:08   ` Mike Waychison [this message]

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