This patch makes mem_cgroup_isolate_pages() to be - ignore !PageLRU pages. - fixes the bug that isolation makes no progress if page_zone(page) != zone page once find. (just increment scan in this case.)
kswapd and memory migration removes a page from list when it handles a page for reclaiming/migration. Because __isolate_lru_page() doesn't moves page !PageLRU pages, it will be safe to avoid touching !PageLRU() page and its page_cgroup. Chnagelog v1 -> v2: * adjusted to 2.6.23-mm1 Signed-off-by: KAMEZAWA Hiroyuki <[EMAIL PROTECTED]> mm/memcontrol.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) Index: devel-2.6.23-mm1/mm/memcontrol.c =================================================================== --- devel-2.6.23-mm1.orig/mm/memcontrol.c +++ devel-2.6.23-mm1/mm/memcontrol.c @@ -250,7 +250,7 @@ unsigned long mem_cgroup_isolate_pages(u unsigned long scan; LIST_HEAD(pc_list); struct list_head *src; - struct page_cgroup *pc; + struct page_cgroup *pc, *tmp; if (active) src = &mem_cont->active_list; @@ -258,11 +258,18 @@ unsigned long mem_cgroup_isolate_pages(u src = &mem_cont->inactive_list; spin_lock(&mem_cont->lru_lock); - for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) { - pc = list_entry(src->prev, struct page_cgroup, lru); + scan = 0; + list_for_each_entry_safe_reverse(pc, tmp, src, lru) { + if (scan++ > nr_taken) + break; page = pc->page; VM_BUG_ON(!pc); + if (unlikely(!PageLRU(page))) { + scan--; + continue; + } + if (PageActive(page) && !active) { __mem_cgroup_move_lists(pc, true); scan--; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/