mm: memcontrol: eliminate root memory.current
memory.current on the root level doesn't add anything that wouldn't be
more accurate and detailed using system statistics. It already doesn't
include slabs, and it'll be a pain to keep in sync when further memory
types are accounted in the memory controller. Remove it.
Note that this applies to the new unified hierarchy interface only.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a44494f..59b100f 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5026,7 +5026,9 @@
static u64 memory_current_read(struct cgroup_subsys_state *css,
struct cftype *cft)
{
- return mem_cgroup_usage(mem_cgroup_from_css(css), false);
+ struct mem_cgroup *memcg = mem_cgroup_from_css(css);
+
+ return (u64)page_counter_read(&memcg->memory) * PAGE_SIZE;
}
static int memory_low_show(struct seq_file *m, void *v)
@@ -5138,6 +5140,7 @@
static struct cftype memory_files[] = {
{
.name = "current",
+ .flags = CFTYPE_NOT_ON_ROOT,
.read_u64 = memory_current_read,
},
{