On Fri 05-01-18 11:15:18, Cristopher Lameter wrote: > On Fri, 5 Jan 2018, Michal Hocko wrote: > > > Yes. I am really wondering because there souldn't anything specific to > > improve the situation with patch 2 and 3. Likewise the only overhead > > from the patch 1 I can see is the reduced batching of the mmap_sem. But > > then I am wondering what would compensate that later... > > Could you reduce the frequency of taking mmap_sem? Maybe take it when > picking a new node and drop it when done with that node before migrating > the list of pages? I believe there should be some cap on the number of pages. We shouldn't keep it held for million of pages if all of them are moved to the same node. I would really like to postpone that to later unless it causes some noticeable regressions because this would complicate the code further and I am not sure this is all worth it. -- Michal Hocko SUSE Labs -- 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>
