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-rw-r--r--mm/memcontrol.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index af28e12..027c0dd 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -144,6 +144,11 @@ struct mem_cgroup {
*/
struct mem_cgroup_lru_info info;
+ /*
+ protect against reclaim related member.
+ */
+ spinlock_t reclaim_param_lock;
+
int prev_priority; /* for recording reclaim priority */
/*
@@ -400,18 +405,28 @@ int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem)
*/
int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
{
- return mem->prev_priority;
+ int prev_priority;
+
+ spin_lock(&mem->reclaim_param_lock);
+ prev_priority = mem->prev_priority;
+ spin_unlock(&mem->reclaim_param_lock);
+
+ return prev_priority;
}
void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, int priority)
{
+ spin_lock(&mem->reclaim_param_lock);
if (priority < mem->prev_priority)
mem->prev_priority = priority;
+ spin_unlock(&mem->reclaim_param_lock);
}
void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, int priority)
{
+ spin_lock(&mem->reclaim_param_lock);
mem->prev_priority = priority;
+ spin_unlock(&mem->reclaim_param_lock);
}
int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone)
@@ -2076,6 +2091,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
}
mem_cgroup_set_inactive_ratio(mem);
mem->last_scanned_child = NULL;
+ spin_lock_init(&mem->reclaim_param_lock);
return &mem->css;
free_out:
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