linux-kernel - Re: Automatic page sharing/consolidation

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Message-ID: <4805E5E9.4080402@qumranet.com>
Date:	Wed, 16 Apr 2008 14:41:29 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	weigelt@...ux.de
CC:	linux kernel list <linux-kernel@...r.kernel.org>,
	kvm-devel <kvm-devel@...ts.sourceforge.net>,
	Izik Eidus <izike@...ranet.com>
Subject: Re: Automatic page sharing/consolidation

Enrico Weigelt wrote:
> Hi folks,
>
> I'm using dozens of VE's / jails to separate applications
> (even complete webapps w/ their own httpd) for easier maintenance
> and better security. But this tends to consume a lot of memory,
> since code sharing (.so's) cannot take effect here (each jail/VE
> has it's completely own tree). 
>
> Now I wonder if it might be possible to let the kernel automatically
> find out equal pages and map them together. 
>
> A little compasion showed up that at least 50% of the code could be
> shared (maybe more with some tuning, and maybe even data). So it's
> (IMHO) really worth it.
>
> Would this be possible ? What had to be done for this ?
>   

Izik (copied) is working on this for kvm.  Results so far are very 
encouraging, but currently merged pages are not swappable.

-- 
error compiling committee.c: too many arguments to function

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