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-rw-r--r--mm/memcontrol.c25
1 files changed, 18 insertions, 7 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 52840adae62..9a99cfaf0a1 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1591,7 +1591,8 @@ bool mem_cgroup_handle_oom(struct mem_cgroup *mem, gfp_t mask)
* small, we check MEM_CGROUP_ON_MOVE percpu value and detect there are
* possibility of race condition. If there is, we take a lock.
*/
-void mem_cgroup_update_file_mapped(struct page *page, int val)
+
+static void mem_cgroup_update_file_stat(struct page *page, int idx, int val)
{
struct mem_cgroup *mem;
struct page_cgroup *pc = lookup_page_cgroup(page);
@@ -1613,13 +1614,18 @@ void mem_cgroup_update_file_mapped(struct page *page, int val)
if (!mem || !PageCgroupUsed(pc))
goto out;
}
- if (val > 0) {
- this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
- SetPageCgroupFileMapped(pc);
- } else {
- this_cpu_dec(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
- if (!page_mapped(page)) /* for race between dec->inc counter */
+
+ this_cpu_add(mem->stat->count[idx], val);
+
+ switch (idx) {
+ case MEM_CGROUP_STAT_FILE_MAPPED:
+ if (val > 0)
+ SetPageCgroupFileMapped(pc);
+ else if (!page_mapped(page))
ClearPageCgroupFileMapped(pc);
+ break;
+ default:
+ BUG();
}
out:
@@ -1629,6 +1635,11 @@ out:
return;
}
+void mem_cgroup_update_file_mapped(struct page *page, int val)
+{
+ mem_cgroup_update_file_stat(page, MEM_CGROUP_STAT_FILE_MAPPED, val);
+}
+
/*
* size of first charge trial. "32" comes from vmscan.c's magic value.
* TODO: maybe necessary to use big numbers in big irons.