Re: [PATCH v2] KSM: numa awareness sysfs knob

[David Rientjes]

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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