linux-kernel - Re: heavy file i/o on ext3 filesystem leads to huge ext3_inode_cache and dentry_cache that doesn't return to normal for hours

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Date:	Fri, 04 Aug 2006 10:43:07 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Maarten Maathuis <madman2003@...il.com>
Cc:	Dave Kleikamp <shaggy@...tin.ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: heavy file i/o on ext3 filesystem leads to huge
	ext3_inode_cache and dentry_cache that doesn't return to normal for hours

Ar Gwe, 2006-08-04 am 09:53 +0200, ysgrifennodd Maarten Maathuis:
> > > Whenever there is serious hard drive activity (such as doing "slocate
> > > -u") ext3_inode_cache and dentry_cache grow to a combined 400-500 MiB.
> >
> > The behavior of slocate (updatedb) is pretty well-known, but nobody has
> > come up with a real solution.

Thats not actually true. There is patch to page back in code on a quiet
machine which is in -mm and is designed to pull stuff back after a busy
period. There was also discussion (but not yet code) for splitting the
dcache into two and being much smarter about recycling it.


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