linux-kernel - Re: [PATCH 0/11] ksm: NUMA trees and page migration

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Message-ID: <1359590736.1557.0.camel@kernel>
Date:	Wed, 30 Jan 2013 18:05:36 -0600
From:	Ric Mason <ric.masonn@...il.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Izik Eidus <izik.eidus@...ellosystems.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Petr Holasek <pholasek@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Anton Arapov <anton@...hat.com>, Mel Gorman <mgorman@...e.de>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 0/11] ksm: NUMA trees and page migration

On Tue, 2013-01-29 at 17:51 +0100, Andrea Arcangeli wrote:
> Hi everyone,
> 
> On Tue, Jan 29, 2013 at 04:26:13AM +0200, Izik Eidus wrote:
> > On 01/29/2013 02:49 AM, Izik Eidus wrote:
> > > On 01/29/2013 01:54 AM, Andrew Morton wrote:
> > >> On Fri, 25 Jan 2013 17:53:10 -0800 (PST)
> > >> Hugh Dickins <hughd@...gle.com> wrote:
> > >>
> > >>> Here's a KSM series
> > >> Sanity check: do you have a feeling for how useful KSM is?
> > >> Performance/space improvements for typical (or atypical) workloads?
> > >> Are people using it?  Successfully?
> > 
> > 
> > BTW, After thinking a bit about the word people, I wanted to see if 
> > normal users of linux
> > that just download and install Linux (without using special 
> > virtualization product) are able to use it.
> > So I google little bit for it, and found some nice results from users:
> > http://serverascode.com/2012/11/11/ksm-kvm.html
> > 
> > But I do agree that it provide justifying value only for virtualization 
> > users...
> 
> Mostly for virtualization users indeed, but I'm aware of a few non
> virtualization users too:
> 
> 1) CERN has been one of the early adopters of KSM and initially they
> were using KSM standalone (probably because not all hypervisors they
> had to deal with were KVM/linux based, while all guests were linux and
> in turn KSM capable). More info in the KSM paper page 2:
> 
> http://www.kernel.org/doc/ols/2009/ols2009-pages-19-28.pdf
> 
> However lately they're running KSM in combination with KVM too, and I'm
> not sure if they're still using it standalone. See the "KSM shared"
> blue area in slide 12 and the comparison with KSM on and off in slide
> 14.
> 
> https://indico.fnal.gov/getFile.py/access?contribId=18&sessionId=4&resId=0&materialId=slides&confId=4986
> 
> 2) all recent cyanogenmod in the performance menu in settings supports
> KSM out of the box. You can run it for a while and then shut it
> off.
> 
> Not sure how good idea it is to leave it always on, but the only
> efficient cellphone/tablet powersaving design (i.e. the wakelocks +
> suspend to ram) still won't waste energy while the screen is off and
> the phone has suspended to ram, regardless of KSM on or off.
> 
> KSM NUMA awareness however is not needed on the cellphone :).

Thanks for your sharing. Is there ksm benchmark? How to get it?

> 
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