On Fri, 20 May 2011 14:36:13 +0900 Minchan Kim <minchan.kim@xxxxxxxxx> wrote: > On Fri, May 20, 2011 at 2:08 PM, KAMEZAWA Hiroyuki > <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote: > > On Fri, 20 May 2011 13:20:15 +0900 > > Minchan Kim <minchan.kim@xxxxxxxxx> wrote: > > > >> So I want to resolve your problem asap. > >> We don't have see report about that. Could you do git-bisect? > >> FYI, Recently, big change of mm is compaction,transparent huge pages. > >> Kame, could you point out thing related to memcg if you have a mind? > >> > > > > I don't doubt memcg at this stage because it never modify page->flags. > > Consdering the case, PageActive() is set against off-LRU pages after > > clear_active_flags() clears it. > > > > Hmm, I think I don't understand the lock system fully but...how do you > > think this ? > > > > == > > > > At splitting a hugepage, the routine marks all pmd as "splitting". > > > > But assume a racy case where 2 threads run into spit at the > > same time, one thread wins compound_lock() and do split, another > > thread should not touch splitted pages. > > Sorry. Now I don't have a time to review in detail. > When I look it roughly, page_lock_anon_vma have to prevent it. > But Andrea needs current this problem and he will catch something we lost. :) > Hmm, maybe I miss something...need to build a test environ on my side. But I'm not sure I can reproduce it.. Thanks, -Kame -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>