On Fri, 29 Jun 2012, Johannes Weiner wrote: > On Fri, Jun 29, 2012 at 01:49:52PM +0200, Petr Holasek wrote: > > Introduces new sysfs boolean knob /sys/kernel/mm/ksm/merge_nodes > > which control merging pages across different numa nodes. > > When it is set to zero only pages from the same node are merged, > > otherwise pages from all nodes can be merged together (default behavior). > > Is it conceivable that admins may (in the future) want to merge only > across nodes that are below a given distance threshold? > > I'm not asking to implement this, just whether the knob can be > introduced such that it's future-compatible. Make it default to a > Very High Number and only allow setting it to 0 for now e.g.? And > name it max_node_merge_distance (I'm bad at names)? > > What do you think? I started with exactly same idea as you described above in the first RFC, link: https://lkml.org/lkml/2011/11/30/91 But this approach turned out to be more complicated than it looked (see two last emails in thread) and complexity of solution would rise a lot. Regards, Petr H -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>