This patch updates 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 <[EMAIL PROTECTED]>
---
mm/memcontrol.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
Index: hierarchy_lock-mmotm-2008-12-09/mm/memcontrol.c
===================================================================
--- hierarchy_lock-mmotm-2008-12-09.orig/mm/memcontrol.c
+++ hierarchy_lock-mmotm-2008-12-09/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;
/*
@@ -529,7 +529,7 @@ 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)
@@ -598,7 +598,7 @@ 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;
@@ -619,7 +619,7 @@ 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;
}
@@ -683,18 +683,16 @@ static int mem_cgroup_hierarchical_recla
while (next_mem != root_mem) {
if (next_mem->obsolete) {
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;
}
--
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