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Message-Id: <1428350318-8215-6-git-send-email-tj@kernel.org>
Date: Mon, 6 Apr 2015 15:57:54 -0400
From: Tejun Heo <tj@...nel.org>
To: axboe@...nel.dk
Cc: linux-kernel@...r.kernel.org, jack@...e.cz, hch@...radead.org,
hannes@...xchg.org, linux-fsdevel@...r.kernel.org,
vgoyal@...hat.com, lizefan@...wei.com, cgroups@...r.kernel.org,
linux-mm@...ck.org, mhocko@...e.cz, clm@...com,
fengguang.wu@...el.com, david@...morbit.com, gthelen@...gle.com,
Tejun Heo <tj@...nel.org>
Subject: [PATCH 05/49] memcg: add mem_cgroup_root_css
Add global mem_cgroup_root_css which points to the root memcg css.
This will be used by cgroup writeback support. If memcg is disabled,
it's defined as ERR_PTR(-EINVAL).
Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Johannes Weiner <hannes@...xchg.org>
aCc: Michal Hocko <mhocko@...e.cz>
---
include/linux/memcontrol.h | 4 ++++
mm/memcontrol.c | 2 ++
2 files changed, 6 insertions(+)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 5fe6411..294498f 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -68,6 +68,8 @@ enum mem_cgroup_events_index {
};
#ifdef CONFIG_MEMCG
+extern struct cgroup_subsys_state *mem_cgroup_root_css;
+
void mem_cgroup_events(struct mem_cgroup *memcg,
enum mem_cgroup_events_index idx,
unsigned int nr);
@@ -196,6 +198,8 @@ void mem_cgroup_split_huge_fixup(struct page *head);
#else /* CONFIG_MEMCG */
struct mem_cgroup;
+#define mem_cgroup_root_css ((struct cgroup_subsys_state *)ERR_PTR(-EINVAL))
+
static inline void mem_cgroup_events(struct mem_cgroup *memcg,
enum mem_cgroup_events_index idx,
unsigned int nr)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index cf25d1a..fda7025 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -71,6 +71,7 @@ EXPORT_SYMBOL(memory_cgrp_subsys);
#define MEM_CGROUP_RECLAIM_RETRIES 5
static struct mem_cgroup *root_mem_cgroup __read_mostly;
+struct cgroup_subsys_state *mem_cgroup_root_css __read_mostly;
/* Whether the swap controller is active */
#ifdef CONFIG_MEMCG_SWAP
@@ -4551,6 +4552,7 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
/* root ? */
if (parent_css == NULL) {
root_mem_cgroup = memcg;
+ mem_cgroup_root_css = &memcg->css;
page_counter_init(&memcg->memory, NULL);
memcg->high = PAGE_COUNTER_MAX;
memcg->soft_limit = PAGE_COUNTER_MAX;
--
2.1.0
--
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