From: Andrew Morton <akpm@linux-foundation.org>
To: David Chinner <dgc@sgi.com>
Cc: Jens Axboe <jens.axboe@oracle.com>,
Christoph Lameter <clameter@sgi.com>,
linux-kernel@vger.kernel.org,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Nick Piggin <nickpiggin@yahoo.com.au>, Paul Jackson <pj@sgi.com>,
Andi Kleen <ak@suse.de>
Subject: Re: [RFC 0/8] Variable Order Page Cache
Date: Sat, 21 Apr 2007 15:18:30 -0700 [thread overview]
Message-ID: <20070421151830.4edb54ae.akpm@linux-foundation.org> (raw)
In-Reply-To: <20070420074818.GN32602149@melbourne.sgi.com>
On Fri, 20 Apr 2007 17:48:18 +1000 David Chinner <dgc@sgi.com> wrote:
> Agreed - I was talking about a quick way to hack a real filesystem
> in to the VM to start exercising the new VM code without needing to
> implement compound page support down the whole I/O stack.
Yes. The whole point of this work is to speed stuff up, so I'd encourage
people to first work on getting some minimal scruffy proptotype in place -
whatever is needed to be able to start running performance tests.
Then we can take a look at the numbers (and the types of machines and
workloads upon which they are based) and decide whether it looks like
there's any point in proceeding with a full-on implementation.
And as part of that decision-making process we should take a detailed look
at the performance of the existing code and see if there are other ways in
which it might be acceptably sped up.
Because right now we're assuming that larger pages are the only way in
which acceptable performance may be obtained. But that has not been proved.
next prev parent reply other threads:[~2007-04-21 22:18 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-19 16:35 [RFC 0/8] Variable Order Page Cache Christoph Lameter
2007-04-19 16:35 ` [RFC 1/8] Add order field to address_space struct Christoph Lameter
2007-04-19 16:35 ` [RFC 2/8] Basic allocation for higher order page cache pages Christoph Lameter
2007-04-20 10:55 ` Mel Gorman
2007-04-19 16:35 ` [RFC 3/8] Flushing and zeroing " Christoph Lameter
2007-04-20 11:02 ` Mel Gorman
2007-04-20 16:15 ` Christoph Lameter
2007-04-20 16:51 ` William Lee Irwin III
2007-04-19 16:35 ` [RFC 4/8] Enhance fallback functions in libs to support higher order pages Christoph Lameter
2007-04-19 18:48 ` Adam Litke
2007-04-19 19:10 ` Christoph Lameter
2007-04-19 22:50 ` David Chinner
2007-04-20 1:15 ` Christoph Lameter
2007-04-20 8:21 ` Jens Axboe
2007-04-20 16:01 ` Christoph Lameter
2007-04-20 16:51 ` Jens Axboe
2007-04-20 11:05 ` Mel Gorman
2007-04-20 18:50 ` Dave Kleikamp
2007-04-20 19:10 ` Christoph Lameter
2007-04-20 19:27 ` Dave Kleikamp
2007-04-24 23:00 ` Matt Mackall
2007-04-19 16:35 ` [RFC 5/8] Enhance generic_read/write " Christoph Lameter
2007-04-19 16:35 ` [RFC 6/8] Account for pages in the page cache in terms of base pages Christoph Lameter
2007-04-19 17:45 ` Nish Aravamudan
2007-04-19 17:52 ` Christoph Lameter
2007-04-19 17:54 ` Avi Kivity
2007-04-19 16:35 ` [RFC 7/8] Enhance ramfs to support higher order pages Christoph Lameter
2007-04-20 13:42 ` Mel Gorman
2007-04-20 14:47 ` William Lee Irwin III
2007-04-20 16:30 ` Christoph Lameter
2007-04-20 17:11 ` William Lee Irwin III
2007-04-20 17:15 ` Christoph Lameter
2007-04-20 17:19 ` William Lee Irwin III
2007-04-20 17:57 ` Christoph Lameter
2007-04-20 19:21 ` William Lee Irwin III
2007-04-20 17:59 ` Christoph Lameter
2007-04-20 18:01 ` Christoph Lameter
2007-04-20 18:02 ` Christoph Lameter
2007-04-20 16:20 ` Christoph Lameter
2007-04-19 16:35 ` [RFC 8/8] Add some debug output Christoph Lameter
2007-04-19 19:09 ` [RFC 0/8] Variable Order Page Cache Badari Pulavarty
2007-04-19 19:12 ` Christoph Lameter
2007-04-19 19:11 ` Andi Kleen
2007-04-19 19:15 ` Christoph Lameter
2007-04-20 14:37 ` Mel Gorman
2007-04-19 22:42 ` David Chinner
2007-04-20 1:14 ` Christoph Lameter
2007-04-20 6:32 ` Jens Axboe
2007-04-20 7:48 ` David Chinner
2007-04-21 22:18 ` Andrew Morton [this message]
2007-04-19 23:58 ` Maxim Levitsky
2007-04-20 1:15 ` Christoph Lameter
2007-04-20 4:47 ` William Lee Irwin III
2007-04-20 5:27 ` Christoph Lameter
2007-04-20 6:22 ` William Lee Irwin III
2007-04-20 8:42 ` David Chinner
2007-04-20 14:14 ` Mel Gorman
2007-04-20 16:23 ` Christoph Lameter
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