linux-kernel - Re: -mm merge plans for 2.6.23

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Message-Id: <20070726023401.f6a2fbdf.akpm@linux-foundation.org>
Date:	Thu, 26 Jul 2007 02:34:01 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Frank Kingswood <frank@...gswood-consulting.co.uk>,
	Andi Kleen <andi@...stfloor.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Ray Lee <ray-lk@...rabbit.org>,
	Jesper Juhl <jesper.juhl@...il.com>,
	ck list <ck@....kolivas.org>, Paul Jackson <pj@....com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: -mm merge plans for 2.6.23

On Thu, 26 Jul 2007 11:20:25 +0200 Ingo Molnar <mingo@...e.hu> wrote:

> Once we give the kernel the knowledge that the dentry wont be used again 
> by this app, the kernel can do a lot more intelligent decision and not 
> baloon the dentry cache.
> 
> ( we _do_ want to baloon the dentry cache otherwise - for things like 
>   "find" - having a fast VFS is important. But known-use-once things 
>   like the daily updatedb job can clearly be annotated properly. )

Mutter.  /proc/sys/vm/vfs_cache_pressure has been there for what, three
years?  Are any distros raising it during the updatedb run yet?
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