The patch titled
Subject: memcg: update the mm->memcg maintenance to work when !CONFIG_MMU
has been added to the -mm tree. Its filename is
memcg-replace-mm-owner-with-mm-memcg-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/memcg-replace-mm-owner-with-mm-memcg-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/memcg-replace-mm-owner-with-mm-memcg-fix.patch
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------------------------------------------------------
From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Subject: memcg: update the mm->memcg maintenance to work when !CONFIG_MMU
Michal Hocko <mhocko@xxxxxxxxxx> reported:
> I am getting the following for nommu with MEMCG=y randconfig:
> kernel/fork.o: In function `mm_init':
> fork.c:(.text+0x948): undefined reference to `mm_update_memcg'
> kernel/fork.o: In function `mmput':
> fork.c:(.text+0x119c): undefined reference to `mm_update_memcg'
> make: *** [vmlinux] Error 1
A memory control group that only accounts mm activity on page fault seems
pointless when !MMU. Still I don't intend to break it so move the
mm->memcg changes out of #ifndef MMU.
Link: http://lkml.kernel.org/r/87lgczcox0.fsf_-_@xxxxxxxxxxxx
Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Reported-by: Michal Hocko <mhocko@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 109 +++++++++++++++++++++-------------------------
1 file changed, 51 insertions(+), 58 deletions(-)
diff -puN mm/memcontrol.c~memcg-replace-mm-owner-with-mm-memcg-fix mm/memcontrol.c
--- a/mm/memcontrol.c~memcg-replace-mm-owner-with-mm-memcg-fix
+++ a/mm/memcontrol.c
@@ -4862,59 +4862,6 @@ static int mem_cgroup_can_attach(struct
return ret;
}
-/**
- * mm_update_memcg - Update the memory cgroup of a mm_struct
- * @mm: mm struct
- * @new: new memory cgroup value
- *
- * Called whenever mm->memcg needs to change. Consumes a reference
- * to new (unless new is NULL). The reference to the old memory
- * cgroup is decreased.
- */
-void mm_update_memcg(struct mm_struct *mm, struct mem_cgroup *new)
-{
- /* This is the only place where mm->memcg is changed */
- struct mem_cgroup *old;
-
- old = xchg(&mm->memcg, new);
- if (old)
- css_put(&old->css);
-}
-
-static void task_update_memcg(struct task_struct *tsk, struct mem_cgroup *new)
-{
- struct mm_struct *mm;
- task_lock(tsk);
- mm = tsk->mm;
- if (mm && !(tsk->flags & PF_KTHREAD))
- mm_update_memcg(mm, new);
- task_unlock(tsk);
-}
-
-static void mem_cgroup_attach(struct cgroup_taskset *tset)
-{
- struct cgroup_subsys_state *css;
- struct task_struct *tsk;
-
- cgroup_taskset_for_each(tsk, css, tset) {
- struct mem_cgroup *new = mem_cgroup_from_css(css);
- css_get(css);
- task_update_memcg(tsk, new);
- }
-}
-
-static void mem_cgroup_fork(struct task_struct *tsk)
-{
- struct cgroup_subsys_state *css;
-
- rcu_read_lock();
- css = task_css(tsk, memory_cgrp_id);
- if (css && css_tryget(css))
- task_update_memcg(tsk, mem_cgroup_from_css(css));
- rcu_read_unlock();
-}
-
-
static void mem_cgroup_cancel_attach(struct cgroup_taskset *tset)
{
if (mc.to)
@@ -5083,19 +5030,65 @@ static int mem_cgroup_can_attach(struct
{
return 0;
}
-static void mem_cgroup_attach(struct cgroup_taskset *tset)
+static void mem_cgroup_cancel_attach(struct cgroup_taskset *tset)
{
}
-static void mem_cgroup_fork(struct task_struct *task)
+static void mem_cgroup_move_task(void)
{
}
-static void mem_cgroup_cancel_attach(struct cgroup_taskset *tset)
+#endif
+
+/**
+ * mm_update_memcg - Update the memory cgroup of a mm_struct
+ * @mm: mm struct
+ * @new: new memory cgroup value
+ *
+ * Called whenever mm->memcg needs to change. Consumes a reference
+ * to new (unless new is NULL). The reference to the old memory
+ * cgroup is decreased.
+ */
+void mm_update_memcg(struct mm_struct *mm, struct mem_cgroup *new)
{
+ /* This is the only place where mm->memcg is changed */
+ struct mem_cgroup *old;
+
+ old = xchg(&mm->memcg, new);
+ if (old)
+ css_put(&old->css);
}
-static void mem_cgroup_move_task(void)
+
+static void task_update_memcg(struct task_struct *tsk, struct mem_cgroup *new)
+{
+ struct mm_struct *mm;
+ task_lock(tsk);
+ mm = tsk->mm;
+ if (mm && !(tsk->flags & PF_KTHREAD))
+ mm_update_memcg(mm, new);
+ task_unlock(tsk);
+}
+
+static void mem_cgroup_attach(struct cgroup_taskset *tset)
{
+ struct cgroup_subsys_state *css;
+ struct task_struct *tsk;
+
+ cgroup_taskset_for_each(tsk, css, tset) {
+ struct mem_cgroup *new = mem_cgroup_from_css(css);
+ css_get(css);
+ task_update_memcg(tsk, new);
+ }
+}
+
+static void mem_cgroup_fork(struct task_struct *tsk)
+{
+ struct cgroup_subsys_state *css;
+
+ rcu_read_lock();
+ css = task_css(tsk, memory_cgrp_id);
+ if (css && css_tryget(css))
+ task_update_memcg(tsk, mem_cgroup_from_css(css));
+ rcu_read_unlock();
}
-#endif
/*
* Cgroup retains root cgroups across [un]mount cycles making it necessary
_
Patches currently in -mm which might be from ebiederm@xxxxxxxxxxxx are
memcg-replace-mm-owner-with-mm-memcg.patch
memcg-replace-mm-owner-with-mm-memcg-fix.patch
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