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Re: [patch 10/21] buffer heads: Support slab defrag

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From: David Chinner
Subject: Re: [patch 10/21] buffer heads: Support slab defrag
Date: Sunday, May 11, 2008 - 5:24 pm

On Fri, May 09, 2008 at 08:08:41PM -0700, Christoph Lameter wrote:

Oh, no, please don't trigger more random single page writeback from
memory reclaim.  We shoul dbe killing the VM's use of ->writepage,
not encouraging it.

If you are going to clean bufferheads (or pages), please clean entire
mappings via ->writepages as it leads to far superior I/O patterns
and a far higher aggregate rate of page cleaning.....

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
--
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Messages in current thread:
[patch 10/21] buffer heads: Support slab defrag, Christoph Lameter, (Fri May 9, 8:08 pm)
Re: [patch 10/21] buffer heads: Support slab defrag, David Chinner, (Sun May 11, 5:24 pm)
Re: [patch 10/21] buffer heads: Support slab defrag, Christoph Lameter, (Thu May 15, 10:42 am)
Re: [patch 10/21] buffer heads: Support slab defrag, David Chinner, (Thu May 15, 4:10 pm)
Re: [patch 10/21] buffer heads: Support slab defrag, Christoph Lameter, (Fri May 16, 10:01 am)
Re: [patch 10/21] buffer heads: Support slab defrag, David Chinner, (Sun May 18, 10:45 pm)
Re: [patch 10/21] buffer heads: Support slab defrag, Christoph Lameter, (Mon May 19, 9:44 am)
Re: [patch 10/21] buffer heads: Support slab defrag, David Chinner, (Mon May 19, 5:25 pm)
Re: [patch 10/21] buffer heads: Support slab defrag, Evgeniy Polyakov, (Mon May 19, 11:56 pm)
Re: [patch 10/21] buffer heads: Support slab defrag, David Chinner, (Tue May 20, 2:46 pm)
Re: [patch 10/21] buffer heads: Support slab defrag, Evgeniy Polyakov, (Tue May 20, 3:25 pm)
Re: [patch 10/21] buffer heads: Support slab defrag, Jamie Lokier, (Tue May 20, 3:53 pm)
Re: [patch 10/21] buffer heads: Support slab defrag, David Chinner, (Tue May 20, 4:19 pm)
Re: [patch 10/21] buffer heads: Support slab defrag, Evgeniy Polyakov, (Tue May 20, 4:22 pm)
Re: [patch 10/21] buffer heads: Support slab defrag, Andrew Morton, (Tue May 20, 4:28 pm)
Re: [patch 10/21] buffer heads: Support slab defrag, David Chinner, (Tue May 20, 4:30 pm)
Re: [patch 10/21] buffer heads: Support slab defrag, Christoph Lameter, (Tue May 20, 6:56 pm)
Re: [patch 10/21] buffer heads: Support slab defrag, Evgeniy Polyakov, (Tue May 20, 11:15 pm)
Re: [patch 10/21] buffer heads: Support slab defrag, Evgeniy Polyakov, (Tue May 20, 11:20 pm)
Re: [patch 10/21] buffer heads: Support slab defrag, Andrew Morton, (Tue May 20, 11:24 pm)
iput() in reclaim context, Hugh Dickins, (Wed May 21, 10:52 am)
Re: iput() in reclaim context, Evgeniy Polyakov, (Wed May 21, 10:58 am)
Re: iput() in reclaim context, Andrew Morton, (Wed May 21, 11:12 am)