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authorDaisuke Nishimura <nishimura@mxp.nes.nec.co.jp>2011-03-24 02:42:25 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-24 05:46:25 +0300
commitf212ad7cf9c73f8a7fa160e223dcb3f074441a72 (patch)
tree95789ef7ce662e86a3e4aded5dfb97c51dc7b0a0 /include/linux/memcontrol.h
parentaf4a662144884a7dbb19acbef70878b3b955f928 (diff)
downloadlinux-f212ad7cf9c73f8a7fa160e223dcb3f074441a72.tar.xz
memcg: add memcg sanity checks at allocating and freeing pages
Add checks at allocating or freeing a page whether the page is used (iow, charged) from the view point of memcg. This check may be useful in debugging a problem and we did similar checks before the commit 52d4b9ac(memcg: allocate all page_cgroup at boot). This patch adds some overheads at allocating or freeing memory, so it's enabled only when CONFIG_DEBUG_VM is enabled. Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: Minchan Kim <minchan.kim@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/memcontrol.h')
-rw-r--r--include/linux/memcontrol.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 5bb7be2628ca..5a5ce7055839 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -151,6 +151,10 @@ u64 mem_cgroup_get_limit(struct mem_cgroup *mem);
void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail);
#endif
+#ifdef CONFIG_DEBUG_VM
+bool mem_cgroup_bad_page_check(struct page *page);
+void mem_cgroup_print_bad_page(struct page *page);
+#endif
#else /* CONFIG_CGROUP_MEM_RES_CTLR */
struct mem_cgroup;
@@ -352,5 +356,18 @@ static inline void mem_cgroup_split_huge_fixup(struct page *head,
#endif /* CONFIG_CGROUP_MEM_CONT */
+#if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
+static inline bool
+mem_cgroup_bad_page_check(struct page *page)
+{
+ return false;
+}
+
+static inline void
+mem_cgroup_print_bad_page(struct page *page)
+{
+}
+#endif
+
#endif /* _LINUX_MEMCONTROL_H */