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| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2008-02-07 00:14:11 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-07 08:42:20 -0800 |
| commit | ff7283fa3a66823933991ad55a558a3a01d5ab27 (patch) | |
| tree | e183c588497ce9f18fea1589fa66b6a000e2cbb8 /mm/memcontrol.c | |
| parent | ae41be374293e70e1ed441d986afcc6e744ef9d9 (diff) | |
| download | lwn-ff7283fa3a66823933991ad55a558a3a01d5ab27.tar.gz lwn-ff7283fa3a66823933991ad55a558a3a01d5ab27.zip | |
bugfix for memory cgroup controller: avoid !PageLRU page in mem_cgroup_isolate_pages
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.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Pavel Emelianov <xemul@openvz.org>
Cc: Paul Menage <menage@google.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Kirill Korotaev <dev@sw.ru>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: David Rientjes <rientjes@google.com>
Cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 128f45c16fa6..e8493fb2d69e 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -250,7 +250,7 @@ unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan, 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(unsigned long nr_to_scan, 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_to_scan) + 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--; |