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From: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Lameter <clameter@sgi.com>,
	linux-kernel@vger.kernel.org, hch@infradead.org
Subject: Re: [patch 00/14] Page cache cleanup in anticipation of Large Blocksize support
Date: Fri, 15 Jun 2007 10:05:59 -0500	[thread overview]
Message-ID: <1181919959.10658.9.camel@kleikamp.austin.ibm.com> (raw)
In-Reply-To: <20070614150417.c73fb6b9.akpm@linux-foundation.org>

On Thu, 2007-06-14 at 15:04 -0700, Andrew Morton wrote:
> > On Thu, 14 Jun 2007 14:37:33 -0700 (PDT) Christoph Lameter <clameter@sgi.com> wrote:
> > On Thu, 14 Jun 2007, Andrew Morton wrote:
> > 
> > > We want the 100% case.
> > 
> > Yes that is what we intend to do. Universal support for larger blocksize. 
> > I.e. your desktop filesystem will use 64k page size and server platforms 
> > likely much larger.
> 
> With 64k pagesize the amount of memory required to hold a kernel tree (say)
> will go from 270MB to 1400MB.   This is not an optimisation.
> 
> Several 64k pagesize people have already spent time looking at various
> tail-packing schemes to get around this serious problem.  And that's on
> _server_ class machines.  Large ones.  I don't think
> laptop/desktop/samll-server machines would want to go anywhere near this.

I'm one of the ones investigating 64 KB pagesize tail-packing schemes,
and I believe Christoph's cleanups will reduce the intrusiveness and
improve the readability of a tail-packing solution.  I'll add my vote in
support of these patches.

Thanks,
Shaggy
-- 
David Kleikamp
IBM Linux Technology Center


  parent reply	other threads:[~2007-06-15 15:06 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-14 19:38 [patch 00/14] Page cache cleanup in anticipation of Large Blocksize support clameter
2007-06-14 19:38 ` [patch 01/14] Define functions for page cache handling clameter
2007-06-14 19:56   ` Sam Ravnborg
2007-06-14 19:58     ` Christoph Lameter
2007-06-14 20:07       ` Sam Ravnborg
2007-06-14 19:38 ` [patch 02/14] Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user clameter
2007-06-14 19:38 ` [patch 03/14] Use page_cache_xx function in mm/filemap.c clameter
2007-06-14 19:38 ` [patch 04/14] Use page_cache_xxx in mm/page-writeback.c clameter
2007-06-14 19:38 ` [patch 05/14] Use page_cache_xxx in mm/truncate.c clameter
2007-06-14 19:38 ` [patch 06/14] Use page_cache_xxx in mm/rmap.c clameter
2007-06-14 19:38 ` [patch 07/14] Use page_cache_xx in mm/filemap_xip.c clameter
2007-06-14 19:38 ` [patch 08/14] Use page_cache_xx in mm/migrate.c clameter
2007-06-14 19:38 ` [patch 09/14] Use page_cache_xx in fs/libfs.c clameter
2007-06-14 19:38 ` [patch 10/14] Use page_cache_xx in fs/sync clameter
2007-06-14 19:38 ` [patch 11/14] Use page_cache_xx in fs/buffer.c clameter
2007-06-14 19:38 ` [patch 12/14] Use page_cache_xxx in mm/mpage.c clameter
2007-06-14 19:38 ` [patch 13/14] Use page_cache_xxx in mm/fadvise.c clameter
2007-06-14 19:38 ` [patch 14/14] Use page_cache_xx in fs/splice.c clameter
2007-06-14 20:06 ` [patch 00/14] Page cache cleanup in anticipation of Large Blocksize support Andrew Morton
2007-06-14 21:07   ` Christoph Hellwig
2007-06-14 21:25     ` Dave McCracken
2007-06-14 21:20   ` Christoph Lameter
2007-06-14 21:32     ` Andrew Morton
2007-06-14 21:37       ` Christoph Lameter
2007-06-14 22:04         ` Andrew Morton
2007-06-14 22:22           ` Christoph Lameter
2007-06-14 22:49             ` Andrew Morton
2007-06-15  0:45               ` Christoph Lameter
2007-06-15  1:40                 ` Andrew Morton
2007-06-15  2:04                   ` Christoph Lameter
2007-06-15  2:23                     ` Andrew Morton
2007-06-15  2:37                       ` Christoph Lameter
2007-06-15  9:03                       ` David Chinner
2007-06-14 23:30           ` David Chinner
2007-06-14 23:41             ` Andrew Morton
2007-06-15  0:29               ` David Chinner
2007-06-15 15:05           ` Dave Kleikamp [this message]
2007-06-17  1:25       ` Arjan van de Ven
2007-06-17  5:02         ` Matt Mackall
2007-06-18  2:08           ` Christoph Lameter
2007-06-18  3:00             ` Arjan van de Ven
2007-06-18  4:50             ` William Lee Irwin III
2007-06-14 23:54   ` David Chinner
2007-07-02 18:16   ` Badari Pulavarty

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