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, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>