linux-kernel - Re: [PATCH v2] KSM: numa awareness sysfs knob

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Message-ID: <alpine.DEB.2.00.1207021425110.24806@chino.kir.corp.google.com>
Date:	Mon, 2 Jul 2012 14:26:17 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Petr Holasek <pholasek@...hat.com>
cc:	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Izik Eidus <izik.eidus@...ellosystems.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Anton Arapov <anton@...hat.com>
Subject: Re: [PATCH v2] KSM: numa awareness sysfs knob

On Sat, 30 Jun 2012, Petr Holasek wrote:

> The problem of the first patch/RFC was that merging algorithm was unstable
> and could merge pages with distance higher than was set up (described by 
> Nai Xia in RFC thread [1]). Sure, this instability could be solved, but for
> ksm pages shared by many other pages on different nodes we would have to still
> recalculate which page is "in the middle" and in case of change migrate it 
> between nodes every time when ksmd reach new shareable page or when some 
> sharing page is removed.
> 

Or you could simply refuse to ever merge any page that is identical to a 
page on a node with a distance greater than the threshold, i.e. never 
merge pages even under the threshold if a page exists on a node higher 
than the threshold.
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