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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4BE5120B.10408@cs.helsinki.fi>
Date:	Sat, 08 May 2010 10:26:03 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	ngupta@...are.org
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)

Nitin Gupta wrote:
> 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

I don't see the xvmalloc vs. kmalloc fragmentation numbers there. I 
thought you had some?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/