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authorJohannes Weiner <hannes@cmpxchg.org>2011-03-23 19:42:30 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-23 22:46:28 -0400
commit6b3ae58efca06623c197fd6d91ded4aa3a8fe039 (patch)
tree6460e4e1ce206d391b862a3d398a9e22e33ecb3c /kernel
parent5564e88ba6fd2f6dcd83a592771810cd84b5ae80 (diff)
memcg: remove direct page_cgroup-to-page pointer
In struct page_cgroup, we have a full word for flags but only a few are reserved. Use the remaining upper bits to encode, depending on configuration, the node or the section, to enable page_cgroup-to-page lookups without a direct pointer. This saves a full word for every page in a system with memory cgroups enabled. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/bounds.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/bounds.c b/kernel/bounds.c
index 98a51f26c136..0c9b862292b2 100644
--- a/kernel/bounds.c
+++ b/kernel/bounds.c
@@ -9,11 +9,13 @@
9#include <linux/page-flags.h> 9#include <linux/page-flags.h>
10#include <linux/mmzone.h> 10#include <linux/mmzone.h>
11#include <linux/kbuild.h> 11#include <linux/kbuild.h>
12#include <linux/page_cgroup.h>
12 13
13void foo(void) 14void foo(void)
14{ 15{
15 /* The enum constants to put into include/generated/bounds.h */ 16 /* The enum constants to put into include/generated/bounds.h */
16 DEFINE(NR_PAGEFLAGS, __NR_PAGEFLAGS); 17 DEFINE(NR_PAGEFLAGS, __NR_PAGEFLAGS);
17 DEFINE(MAX_NR_ZONES, __MAX_NR_ZONES); 18 DEFINE(MAX_NR_ZONES, __MAX_NR_ZONES);
19 DEFINE(NR_PCG_FLAGS, __NR_PCG_FLAGS);
18 /* End of constants */ 20 /* End of constants */
19} 21}