mm: memcontrol: account socket memory in unified hierarchy memory controller

Socket memory can be a significant share of overall memory consumed by
common workloads.  In order to provide reasonable resource isolation in
the unified hierarchy, this type of memory needs to be included in the
tracking/accounting of a cgroup under active memory resource control.

Overhead is only incurred when a non-root control group is created AND
the memory controller is instructed to track and account the memory
footprint of that group.  cgroup.memory=nosocket can be specified on the
boot commandline to override any runtime configuration and forcibly
exclude socket memory from active memory resource control.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: David S. Miller <davem@davemloft.net>
Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 1 deletions

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 03090e8e7fff..a355f61a2ed3 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -170,6 +170,9 @@ struct mem_cgroup {
         unsigned long low;
         unsigned long high;
 
+        /* Range enforcement for interrupt charges */
+        struct work_struct high_work;
+
         unsigned long soft_limit;
 
         /* vmpressure notifications */
@@ -680,12 +683,16 @@ void sock_update_memcg(struct sock *sk);
 void sock_release_memcg(struct sock *sk);
 bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
 void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
-#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_INET)
+#if defined(CONFIG_MEMCG) && defined(CONFIG_INET)
 extern struct static_key memcg_sockets_enabled_key;
 #define mem_cgroup_sockets_enabled static_key_false(&memcg_sockets_enabled_key)
 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
 {
+#ifdef CONFIG_MEMCG_KMEM
         return memcg->tcp_mem.memory_pressure;
+#else
+        return false;
+#endif
 }
 #else
 #define mem_cgroup_sockets_enabled 0