2011/6/2 Johannes Weiner <hannes@xxxxxxxxxxx>: > On Thu, Jun 02, 2011 at 10:16:59PM +0900, Hiroyuki Kamezawa wrote: >> 2011/6/1 Johannes Weiner <hannes@xxxxxxxxxxx>: >> > All lru list walkers have been converted to operate on per-memcg >> > lists, the global per-zone lists are no longer required. >> > >> > This patch makes the per-memcg lists exclusive and removes the global >> > lists from memcg-enabled kernels. >> > >> > The per-memcg lists now string up page descriptors directly, which >> > unifies/simplifies the list isolation code of page reclaim as well as >> > it saves a full double-linked list head for each page in the system. >> > >> > At the core of this change is the introduction of the lruvec >> > structure, an array of all lru list heads. It exists for each zone >> > globally, and for each zone per memcg. All lru list operations are >> > now done in generic code against lruvecs, with the memcg lru list >> > primitives only doing accounting and returning the proper lruvec for >> > the currently scanned memcg on isolation, or for the respective page >> > on putback. >> > >> > Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx> >> >> >> could you divide this into >> - introduce lruvec >> - don't record section? information into pc->flags because we see >> "page" on memcg LRU >> and there is no requirement to get page from "pc". >> - remove pc->lru completely > > Yes, that makes sense. It shall be fixed in the next version. > BTW, IIUC, Transparent hugepage has a code to link a page to the page->lru directly. And recent Minchan's work does the same kind of trick. But it may put a page onto wrong memcgs if we do link a page to another page's page->lru because 2 pages may be in different cgroup each other. Could you check there are more codes which does link page->lru to nearby page's page->lru ? Now, I'm not sure there are other codes....but we need care. 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