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

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Date:	Thu, 26 Jul 2007 09:38:45 +0100
From:	Frank Kingswood <frank@...gswood-consulting.co.uk>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Nick Piggin <nickpiggin@...oo.com.au>,
	Ray Lee <ray-lk@...rabbit.org>,
	Jesper Juhl <jesper.juhl@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	ck list <ck@....kolivas.org>, Ingo Molnar <mingo@...e.hu>,
	Paul Jackson <pj@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: -mm merge plans for 2.6.23

Andi Kleen wrote:
> One simple way to fix this would be to implement a fadvise() flag
> that puts the dentry/inode on a "soon to be expired" list if there
> are no other references. Then if a dentry allocation needs more
> memory try to reuse dentries from that list (or better queue) first. Any other
> access will remove the dentry from the list. 
> 
> Disadvantage would be that the userland would need to be patched,
> but I guess it's better than adding very dubious heuristics to the
> kernel.

Are you going to change every single large memory application in the 
world? As I wrote before, it is *not* about updatedb, but about all 
applications that use a lot of memory, and then terminate.

Frank
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