linux-kernel - [PATCH v3 03/21] memcg: fix page_referencies cgroup filter on global reclaim

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Message-ID: <20120223135151.12988.37646.stgit@zurg>
Date:	Thu, 23 Feb 2012 17:51:51 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andi Kleen <andi@...stfloor.org>
Subject: [PATCH v3 03/21] memcg: fix page_referencies cgroup filter on global
 reclaim

Global memory reclaimer shouldn't skip any page referencies.

This patch pass sc->target_mem_cgroup into page_referenced().
On global memory reclaim it always NULL, so we will account all.
Cgroup reclaimer will account only referencies from target cgroup and its childs.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
---
 mm/vmscan.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 39aa4d7..d133ac6 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -701,13 +701,13 @@ enum page_references {
 };
 
 static enum page_references page_check_references(struct page *page,
-						  struct mem_cgroup_zone *mz,
 						  struct scan_control *sc)
 {
 	int referenced_ptes, referenced_page;
 	unsigned long vm_flags;
 
-	referenced_ptes = page_referenced(page, 1, mz->mem_cgroup, &vm_flags);
+	referenced_ptes = page_referenced(page, 1,
+					  sc->target_mem_cgroup, &vm_flags);
 	referenced_page = TestClearPageReferenced(page);
 
 	/* Lumpy reclaim - ignore references */
@@ -828,7 +828,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
 			}
 		}
 
-		references = page_check_references(page, mz, sc);
+		references = page_check_references(page, sc);
 		switch (references) {
 		case PAGEREF_ACTIVATE:
 			goto activate_locked;
@@ -1735,7 +1735,8 @@ static void shrink_active_list(unsigned long nr_to_scan,
 			continue;
 		}
 
-		if (page_referenced(page, 0, mz->mem_cgroup, &vm_flags)) {
+		if (page_referenced(page, 0,
+				    sc->target_mem_cgroup, &vm_flags)) {
 			nr_rotated += hpage_nr_pages(page);
 			/*
 			 * Identify referenced, file-backed active pages and

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