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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. -- 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/
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