The patch titled
cgroups: use hierarchy_mutex in memory controller
has been removed from the -mm tree. Its filename was
cgroups-use-hierarchy_mutex-in-memory-controller.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: cgroups: use hierarchy_mutex in memory controller
From: Paul Menage <menage@xxxxxxxxxx>
Update the memory controller to use its hierarchy_mutex rather than
calling cgroup_lock() to protected against cgroup_mkdir()/cgroup_rmdir()
from occurring in its hierarchy.
Signed-off-by: Paul Menage <menage@xxxxxxxxxx>
Tested-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Li Zefan <lizf@xxxxxxxxxxxxxx>
Cc: Balbir Singh <balbir@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
diff -puN mm/memcontrol.c~cgroups-use-hierarchy_mutex-in-memory-controller mm/memcontrol.c
--- a/mm/memcontrol.c~cgroups-use-hierarchy_mutex-in-memory-controller
+++ a/mm/memcontrol.c
@@ -154,7 +154,7 @@ struct mem_cgroup {
/*
* While reclaiming in a hiearchy, we cache the last child we
- * reclaimed from. Protected by cgroup_lock()
+ * reclaimed from. Protected by hierarchy_mutex
*/
struct mem_cgroup *last_scanned_child;
/*
@@ -615,7 +615,7 @@ unsigned long mem_cgroup_isolate_pages(u
/*
* This routine finds the DFS walk successor. This routine should be
- * called with cgroup_mutex held
+ * called with hierarchy_mutex held
*/
static struct mem_cgroup *
mem_cgroup_get_next_node(struct mem_cgroup *curr, struct mem_cgroup *root_mem)
@@ -685,7 +685,7 @@ mem_cgroup_get_first_node(struct mem_cgr
/*
* Scan all children under the mem_cgroup mem
*/
- cgroup_lock();
+ mutex_lock(&mem_cgroup_subsys.hierarchy_mutex);
if (list_empty(&root_mem->css.cgroup->children)) {
ret = root_mem;
goto done;
@@ -706,7 +706,7 @@ mem_cgroup_get_first_node(struct mem_cgr
done:
root_mem->last_scanned_child = ret;
- cgroup_unlock();
+ mutex_unlock(&mem_cgroup_subsys.hierarchy_mutex);
return ret;
}
@@ -770,18 +770,16 @@ static int mem_cgroup_hierarchical_recla
while (next_mem != root_mem) {
if (mem_cgroup_is_obsolete(next_mem)) {
mem_cgroup_put(next_mem);
- cgroup_lock();
next_mem = mem_cgroup_get_first_node(root_mem);
- cgroup_unlock();
continue;
}
ret = try_to_free_mem_cgroup_pages(next_mem, gfp_mask, noswap,
get_swappiness(next_mem));
if (mem_cgroup_check_under_limit(root_mem))
return 0;
- cgroup_lock();
+ mutex_lock(&mem_cgroup_subsys.hierarchy_mutex);
next_mem = mem_cgroup_get_next_node(next_mem, root_mem);
- cgroup_unlock();
+ mutex_unlock(&mem_cgroup_subsys.hierarchy_mutex);
}
return ret;
}
_
Patches currently in -mm which might be from menage@xxxxxxxxxx are
origin.patch
add-a-refcount-check-in-dput.patch
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