[PATCH 12/14] mm: memcontrol: move socket code for unified hierarchy accounting

Johannes Weiner
2015-11-12T23:43:37Z

The unified hierarchy memory controller will account socket
memory. Move the infrastructure functions accordingly.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
---
mm/memcontrol.c | 148 ++++++++++++++++++++++++++++----------------------------
1 file changed, 74 insertions(+), 74 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e7f1a79..408fb04 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -294,80 +294,6 @@ static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id)
return mem_cgroup_from_css(css);
}

-/* Writing them here to avoid exposing memcg's inner layout */
-#if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM)
-
-struct static_key memcg_sockets_enabled_key;
-EXPORT_SYMBOL(memcg_sockets_enabled_key);
-
-void sock_update_memcg(struct sock *sk)
-{
- struct mem_cgroup *memcg;
-
- /* Socket cloning can throw us here with sk_cgrp already
- * filled. It won't however, necessarily happen from
- * process context. So the test for root memcg given
- * the current task's memcg won't help us in this case.
- *
- * Respecting the original socket's memcg is a better
- * decision in this case.
- */
- if (sk->sk_memcg) {
- BUG_ON(mem_cgroup_is_root(sk->sk_memcg));
- css_get(&sk->sk_memcg->css);
- return;
- }
-
- rcu_read_lock();
- memcg = mem_cgroup_from_task(current);
- if (memcg != root_mem_cgroup &&
- test_bit(MEMCG_SOCK_ACTIVE, &memcg->tcp_mem.flags) &&
- css_tryget_online(&memcg->css))
- sk->sk_memcg = memcg;
- rcu_read_unlock();
-}
-EXPORT_SYMBOL(sock_update_memcg);
-
-void sock_release_memcg(struct sock *sk)
-{
- WARN_ON(!sk->sk_memcg);
- css_put(&sk->sk_memcg->css);
-}
-
-/**
- * mem_cgroup_charge_skmem - charge socket memory
- * @memcg: memcg to charge
- * @nr_pages: number of pages to charge
- *
- * Charges @nr_pages to @memcg. Returns %true if the charge fit within
- * @memcg's configured limit, %false if the charge had to be forced.
- */
-bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages)
-{
- struct page_counter *counter;
-
- if (page_counter_try_charge(&memcg->tcp_mem.memory_allocated,
- nr_pages, &counter)) {
- memcg->tcp_mem.memory_pressure = 0;
- return true;
- }
- page_counter_charge(&memcg->tcp_mem.memory_allocated, nr_pages);
- memcg->tcp_mem.memory_pressure = 1;
- return false;
-}
-
-/**
- * mem_cgroup_uncharge_skmem - uncharge socket memory
- * @memcg - memcg to uncharge
- * @nr_pages - number of pages to uncharge
- */
-void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages)
-{
- page_counter_uncharge(&memcg->tcp_mem.memory_allocated, nr_pages);
-}
-
-#endif
-
#ifdef CONFIG_MEMCG_KMEM
/*
* This will be the memcg's index in each cache's ->memcg_params.memcg_caches.
@@ -5538,6 +5464,80 @@ void mem_cgroup_replace_page(struct page *oldpage, struct page *newpage)
commit_charge(newpage, memcg, true);
}

+/* Writing them here to avoid exposing memcg's inner layout */
+#if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM)
+
+struct static_key memcg_sockets_enabled_key;
+EXPORT_SYMBOL(memcg_sockets_enabled_key);
+
+void sock_update_memcg(struct sock *sk)
+{
+ struct mem_cgroup *memcg;
+
+ /* Socket cloning can throw us here with sk_cgrp already
+ * filled. It won't however, necessarily happen from
+ * process context. So the test for root memcg given
+ * the current task's memcg won't help us in this case.
+ *
+ * Respecting the original socket's memcg is a better
+ * decision in this case.
+ */
+ if (sk->sk_memcg) {
+ BUG_ON(mem_cgroup_is_root(sk->sk_memcg));
+ css_get(&sk->sk_memcg->css);
+ return;
+ }
+
+ rcu_read_lock();
+ memcg = mem_cgroup_from_task(current);
+ if (memcg != root_mem_cgroup &&
+ test_bit(MEMCG_SOCK_ACTIVE, &memcg->tcp_mem.flags) &&
+ css_tryget_online(&memcg->css))
+ sk->sk_memcg = memcg;
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL(sock_update_memcg);
+
+void sock_release_memcg(struct sock *sk)
+{
+ WARN_ON(!sk->sk_memcg);
+ css_put(&sk->sk_memcg->css);
+}
+
+/**
+ * mem_cgroup_charge_skmem - charge socket memory
+ * @memcg: memcg to charge
+ * @nr_pages: number of pages to charge
+ *
+ * Charges @nr_pages to @memcg. Returns %true if the charge fit within
+ * @memcg's configured limit, %false if the charge had to be forced.
+ */
+bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages)
+{
+ struct page_counter *counter;
+
+ if (page_counter_try_charge(&memcg->tcp_mem.memory_allocated,
+ nr_pages, &counter)) {
+ memcg->tcp_mem.memory_pressure = 0;
+ return true;
+ }
+ page_counter_charge(&memcg->tcp_mem.memory_allocated, nr_pages);
+ memcg->tcp_mem.memory_pressure = 1;
+ return false;
+}
+
+/**
+ * mem_cgroup_uncharge_skmem - uncharge socket memory
+ * @memcg - memcg to uncharge
+ * @nr_pages - number of pages to uncharge
+ */
+void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages)
+{
+ page_counter_uncharge(&memcg->tcp_mem.memory_allocated, nr_pages);
+}
+
+#endif
+
/*
* subsys_initcall() for memory controller.
*
--
2.6.2