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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2009-01-07 18:08:34 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 08:31:10 -0800
commit544122e5e0ee27d5aac4a441f7746712afbf248c (patch)
tree8c5f87b19501478924654ae83a8751fde5dd51d4 /mm
parent54595fe2652f04dc8f5b985312c7cef5aa7bf722 (diff)
downloadlinux-544122e5e0ee27d5aac4a441f7746712afbf248c.tar.gz
memcg: fix LRU accounting for SwapCache
Now, a page can be deleted from SwapCache while do_swap_page(). memcg-fix-swap-accounting-leak-v3.patch handles that, but, LRU handling is still broken. (above behavior broke assumption of memcg-synchronized-lru patch.) This patch is a fix for LRU handling (especially for per-zone counters). At charging SwapCache, - Remove page_cgroup from LRU if it's not used. - Add page cgroup to LRU if it's not linked to. Reported-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Paul Menage <menage@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c59
1 files changed, 50 insertions, 9 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b311f19bbe0..f50cb7b1efd 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -331,8 +331,12 @@ void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru)
return;
pc = lookup_page_cgroup(page);
/* can happen while we handle swapcache. */
- if (list_empty(&pc->lru))
+ if (list_empty(&pc->lru) || !pc->mem_cgroup)
return;
+ /*
+ * We don't check PCG_USED bit. It's cleared when the "page" is finally
+ * removed from global LRU.
+ */
mz = page_cgroup_zoneinfo(pc);
mem = pc->mem_cgroup;
MEM_CGROUP_ZSTAT(mz, lru) -= 1;
@@ -379,16 +383,44 @@ void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru)
MEM_CGROUP_ZSTAT(mz, lru) += 1;
list_add(&pc->lru, &mz->lists[lru]);
}
+
/*
- * To add swapcache into LRU. Be careful to all this function.
- * zone->lru_lock shouldn't be held and irq must not be disabled.
+ * At handling SwapCache, pc->mem_cgroup may be changed while it's linked to
+ * lru because the page may.be reused after it's fully uncharged (because of
+ * SwapCache behavior).To handle that, unlink page_cgroup from LRU when charge
+ * it again. This function is only used to charge SwapCache. It's done under
+ * lock_page and expected that zone->lru_lock is never held.
*/
-static void mem_cgroup_lru_fixup(struct page *page)
+static void mem_cgroup_lru_del_before_commit_swapcache(struct page *page)
+{
+ unsigned long flags;
+ struct zone *zone = page_zone(page);
+ struct page_cgroup *pc = lookup_page_cgroup(page);
+
+ spin_lock_irqsave(&zone->lru_lock, flags);
+ /*
+ * Forget old LRU when this page_cgroup is *not* used. This Used bit
+ * is guarded by lock_page() because the page is SwapCache.
+ */
+ if (!PageCgroupUsed(pc))
+ mem_cgroup_del_lru_list(page, page_lru(page));
+ spin_unlock_irqrestore(&zone->lru_lock, flags);
+}
+
+static void mem_cgroup_lru_add_after_commit_swapcache(struct page *page)
{
- if (!isolate_lru_page(page))
- putback_lru_page(page);
+ unsigned long flags;
+ struct zone *zone = page_zone(page);
+ struct page_cgroup *pc = lookup_page_cgroup(page);
+
+ spin_lock_irqsave(&zone->lru_lock, flags);
+ /* link when the page is linked to LRU but page_cgroup isn't */
+ if (PageLRU(page) && list_empty(&pc->lru))
+ mem_cgroup_add_lru_list(page, page_lru(page));
+ spin_unlock_irqrestore(&zone->lru_lock, flags);
}
+
void mem_cgroup_move_lists(struct page *page,
enum lru_list from, enum lru_list to)
{
@@ -1168,8 +1200,11 @@ int mem_cgroup_cache_charge_swapin(struct page *page,
mem = NULL; /* charge to current */
}
}
+ /* SwapCache may be still linked to LRU now. */
+ mem_cgroup_lru_del_before_commit_swapcache(page);
ret = mem_cgroup_charge_common(page, mm, mask,
MEM_CGROUP_CHARGE_TYPE_SHMEM, mem);
+ mem_cgroup_lru_add_after_commit_swapcache(page);
/* drop extra refcnt from tryget */
if (mem)
css_put(&mem->css);
@@ -1185,8 +1220,6 @@ int mem_cgroup_cache_charge_swapin(struct page *page,
}
if (!locked)
unlock_page(page);
- /* add this page(page_cgroup) to the LRU we want. */
- mem_cgroup_lru_fixup(page);
return ret;
}
@@ -1201,7 +1234,9 @@ void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr)
if (!ptr)
return;
pc = lookup_page_cgroup(page);
+ mem_cgroup_lru_del_before_commit_swapcache(page);
__mem_cgroup_commit_charge(ptr, pc, MEM_CGROUP_CHARGE_TYPE_MAPPED);
+ mem_cgroup_lru_add_after_commit_swapcache(page);
/*
* Now swap is on-memory. This means this page may be
* counted both as mem and swap....double count.
@@ -1220,7 +1255,7 @@ void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr)
}
/* add this page(page_cgroup) to the LRU we want. */
- mem_cgroup_lru_fixup(page);
+
}
void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *mem)
@@ -1288,6 +1323,12 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
mem_cgroup_charge_statistics(mem, pc, false);
ClearPageCgroupUsed(pc);
+ /*
+ * pc->mem_cgroup is not cleared here. It will be accessed when it's
+ * freed from LRU. This is safe because uncharged page is expected not
+ * to be reused (freed soon). Exception is SwapCache, it's handled by
+ * special functions.
+ */
mz = page_cgroup_zoneinfo(pc);
unlock_page_cgroup(pc);