linux-kernel - Re: [PATCH 0/3] ramzswap: Eliminate stale data from compressed memory (v2)

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Message-ID: <4BE50B71.4020202@vflare.org>
Date:	Sat, 08 May 2010 12:27:53 +0530
From:	Nitin Gupta <ngupta@...are.org>
To:	Pekka Enberg <penberg@...helsinki.fi>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <greg@...ah.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Cyp <cyp561@...il.com>, Minchan Kim <minchan.kim@...il.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Andi Kleen <andi@...stfloor.org>,
	driverdev <devel@...verdev.osuosl.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] ramzswap: Eliminate stale data from compressed memory
 (v2)

Oops, missed this part:

On 05/08/2010 11:59 AM, Pekka Enberg wrote: 
> Andrew Morton wrote:
>> I've completely forgotten why we need this xvmalloc thing and I don't
>> recall whether we decided it would be a good thing to have as a generic
>> facility and of course it's all unexplained and undocumented.  I won't
>> be looking at it today, for this reason.
> 
> We need it because the slab allocator is not a good fit for this special
> purpose driver due to fragmentation. Nitin, you had a nice web page
> showing all the relevant numbers but I can't find it anymore.
> 

xvmalloc performance numbers:
http://code.google.com/p/compcache/wiki/xvMalloc
http://code.google.com/p/compcache/wiki/xvMallocPerformance

Thanks,
Nitin
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