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authorBalbir Singh <balbir@linux.vnet.ibm.com>2008-02-07 00:14:01 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-07 08:42:19 -0800
commitbed7161a519a2faef53e1bce1b47595e297c1d14 (patch)
treefbc0541340465f7d83221b829a9382cac2855916 /mm/memcontrol.c
parent8697d33194faae6fdd6b2e799f6308aa00cfdf67 (diff)
downloadop-kernel-dev-bed7161a519a2faef53e1bce1b47595e297c1d14.zip
op-kernel-dev-bed7161a519a2faef53e1bce1b47595e297c1d14.tar.gz
Memory controller: make page_referenced() cgroup aware
Make page_referenced() cgroup aware. Without this patch, page_referenced() can cause a page to be skipped while reclaiming pages. This patch ensures that other cgroups do not hold pages in a particular cgroup hostage. It is required to ensure that shared pages are freed from a cgroup when they are not actively referenced from the cgroup that brought them in Signed-off-by: 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.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 10833d9..ff7cac6 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -110,6 +110,11 @@ struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
struct mem_cgroup, css);
}
+inline struct mem_cgroup *mm_cgroup(struct mm_struct *mm)
+{
+ return rcu_dereference(mm->mem_cgroup);
+}
+
void mm_init_cgroup(struct mm_struct *mm, struct task_struct *p)
{
struct mem_cgroup *mem;
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