[linux-mm-cc] Fwd: [RFC][PATCH 0/6] compcache: Compressed Caching

[Nitin Gupta]

---------- Forwarded message ----------
From: Andrew Morton <akpm at linux-foundation.org>
Date: Wed, Apr 9, 2008 at 8:17 AM
Subject: Re: [RFC][PATCH 0/6] compcache: Compressed Caching
To: nitingupta910 at gmail.com
Cc: linux-mm at kvack.org

On Fri, 21 Mar 2008 01:29:58 +0530 Nitin Gupta <nitingupta910 at gmail.com> wrote:
 > For general desktop use, this is giving *significant* performance gain
 > under memory pressure. For now, it has been tested only on x86.


<snip>

 The values of "*significant*" should be exhaustively documented in the
 patch changelogs. That is 100%-the-entire-whole-point of the patchset!
 Omitting that information tends to reduce the number of C's.

</snip>

<End>



So, I will require performance numbers to justify inclusion of compcache
in mainline. We already have separate perf numbers for lzo(compressor) and
tlsf(allocator) but none that shows that using compcache is good for
perf under memory pressure.

If anyone is willing to take up this task, you can refer this paper:
http://ols.108.redhat.com/2007/Reprints/briglia-Reprint.pdf

This paper shows benchmarks of previous implementation of memory compression.
It will give good idea on what to measure.


Thanks,
Nitin