linux-kernel - Re: [PATCH 0/4] ksm - dynamic page sharing driver for linux v3

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Message-ID: <6934efce0904170008p45cba2c4l3e9ca9f8775c7bde@mail.gmail.com>
Date:	Fri, 17 Apr 2009 00:08:07 -0700
From:	Jared Hulbert <jaredeh@...il.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Izik Eidus <ieidus@...hat.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, linux-mm@...ck.org, avi@...hat.com,
	aarcange@...hat.com, chrisw@...hat.com, mtosatti@...hat.com,
	hugh@...itas.com, kamezawa.hiroyu@...fujitsu.com
Subject: Re: [PATCH 0/4] ksm - dynamic page sharing driver for linux v3

> As everyone knows, my favourite thing is to say nasty things about any
> new feature that adds complexity to common code. I feel like crying to
> hear about how many more instances of MS Office we can all run, if only
> we apply this patch. And the poorly written HPC app just sounds like
> scrapings from the bottom of justification barrel.
>
> I'm sorry, maybe I'm way off with my understanding of how important
> this is. There isn't too much help in the changelog. A discussion of
> where the memory savings comes from, and how far does things like
> sharing of fs image, or ballooning goes and how much extra savings we
> get from this... with people from other hypervisors involved as well.
> Have I missed this kind of discussion?

Nick,

I don't know about other hypervisors, fs and balloonings, but I have
tried this out.  It works.  It works on apps I don't consider, "poorly
written".  I'm very excited about this.  I got >10% saving in a
roughly off the shelf embedded system.  No user noticeable performance
impact.
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