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Date: Fri, 11 Dec 2015 14:54:12 -0500
From: Johannes Weiner <hannes@...xchg.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Michal Hocko <mhocko@...e.cz>,
Vladimir Davydov <vdavydov@...tuozzo.com>, linux-mm@...ck.org,
cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
kernel-team@...com
Subject: [PATCH 3/4] mm: memcontrol: flatten struct cg_proto
There are no more external users of struct cg_proto, flatten the
structure into struct mem_cgroup.
Since using those struct members doesn't stand out as much anymore,
add cgroup2 static branches to make it clearer which code is legacy.
Suggested-by: Vladimir Davydov <vdavydov@...tuozzo.com>
Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
include/linux/memcontrol.h | 14 ++++++--------
mm/memcontrol.c | 33 +++++++++++++++------------------
2 files changed, 21 insertions(+), 26 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 47995b4..a3869bf 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -85,12 +85,6 @@ enum mem_cgroup_events_target {
MEM_CGROUP_NTARGETS,
};
-struct cg_proto {
- struct page_counter memory_allocated; /* Current allocated memory. */
- int memory_pressure;
- bool active;
-};
-
#ifdef CONFIG_MEMCG
struct mem_cgroup_stat_cpu {
long count[MEM_CGROUP_STAT_NSTATS];
@@ -169,8 +163,11 @@ struct mem_cgroup {
/* Accounted resources */
struct page_counter memory;
+
+ /* Legacy consumer-oriented counters */
struct page_counter memsw;
struct page_counter kmem;
+ struct page_counter tcpmem;
/* Normal memory consumption range */
unsigned long low;
@@ -236,7 +233,8 @@ struct mem_cgroup {
unsigned long socket_pressure;
/* Legacy tcp memory accounting */
- struct cg_proto tcp_mem;
+ bool tcpmem_active;
+ int tcpmem_pressure;
#ifndef CONFIG_SLOB
/* Index in the kmem_cache->memcg_params.memcg_caches array */
@@ -715,7 +713,7 @@ extern struct static_key_false memcg_sockets_enabled_key;
#define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key)
static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
{
- if (memcg->tcp_mem.memory_pressure)
+ if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && memcg->tcpmem_pressure)
return true;
do {
if (time_before(jiffies, memcg->socket_pressure))
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 422ff3f..306842c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2822,7 +2822,7 @@ static u64 mem_cgroup_read_u64(struct cgroup_subsys_state *css,
counter = &memcg->kmem;
break;
case _TCP:
- counter = &memcg->tcp_mem.memory_allocated;
+ counter = &memcg->tcpmem;
break;
default:
BUG();
@@ -3007,11 +3007,11 @@ static int memcg_update_tcp_limit(struct mem_cgroup *memcg, unsigned long limit)
mutex_lock(&memcg_limit_mutex);
- ret = page_counter_limit(&memcg->tcp_mem.memory_allocated, limit);
+ ret = page_counter_limit(&memcg->tcpmem, limit);
if (ret)
goto out;
- if (!memcg->tcp_mem.active) {
+ if (!memcg->tcpmem_active) {
/*
* The active flag needs to be written after the static_key
* update. This is what guarantees that the socket activation
@@ -3029,7 +3029,7 @@ static int memcg_update_tcp_limit(struct mem_cgroup *memcg, unsigned long limit)
* patched in yet.
*/
static_branch_inc(&memcg_sockets_enabled_key);
- memcg->tcp_mem.active = true;
+ memcg->tcpmem_active = true;
}
out:
mutex_unlock(&memcg_limit_mutex);
@@ -3098,7 +3098,7 @@ static ssize_t mem_cgroup_reset(struct kernfs_open_file *of, char *buf,
counter = &memcg->kmem;
break;
case _TCP:
- counter = &memcg->tcp_mem.memory_allocated;
+ counter = &memcg->tcpmem;
break;
default:
BUG();
@@ -4273,8 +4273,7 @@ mem_cgroup_css_online(struct cgroup_subsys_state *css)
memcg->soft_limit = PAGE_COUNTER_MAX;
page_counter_init(&memcg->memsw, &parent->memsw);
page_counter_init(&memcg->kmem, &parent->kmem);
- page_counter_init(&memcg->tcp_mem.memory_allocated,
- &parent->tcp_mem.memory_allocated);
+ page_counter_init(&memcg->tcpmem, &parent->tcpmem);
/*
* No need to take a reference to the parent because cgroup
@@ -4286,7 +4285,7 @@ mem_cgroup_css_online(struct cgroup_subsys_state *css)
memcg->soft_limit = PAGE_COUNTER_MAX;
page_counter_init(&memcg->memsw, NULL);
page_counter_init(&memcg->kmem, NULL);
- page_counter_init(&memcg->tcp_mem.memory_allocated, NULL);
+ page_counter_init(&memcg->tcpmem, NULL);
/*
* Deeper hierachy with use_hierarchy == false doesn't make
* much sense so let cgroup subsystem know about this
@@ -4345,7 +4344,7 @@ static void mem_cgroup_css_free(struct cgroup_subsys_state *css)
if (cgroup_subsys_on_dfl(memory_cgrp_subsys) && !cgroup_memory_nosocket)
static_branch_dec(&memcg_sockets_enabled_key);
- if (memcg->tcp_mem.active)
+ if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && memcg->tcpmem_active)
static_branch_dec(&memcg_sockets_enabled_key);
memcg_free_kmem(memcg);
@@ -5572,7 +5571,7 @@ void sock_update_memcg(struct sock *sk)
memcg = mem_cgroup_from_task(current);
if (memcg == root_mem_cgroup)
goto out;
- if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && !memcg->tcp_mem.active)
+ if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && !memcg->tcpmem_active)
goto out;
if (css_tryget_online(&memcg->css))
sk->sk_memcg = memcg;
@@ -5600,15 +5599,14 @@ bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages)
gfp_t gfp_mask = GFP_KERNEL;
if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) {
- struct page_counter *counter;
+ struct page_counter *fail;
- if (page_counter_try_charge(&memcg->tcp_mem.memory_allocated,
- nr_pages, &counter)) {
- memcg->tcp_mem.memory_pressure = 0;
+ if (page_counter_try_charge(&memcg->tcpmem, nr_pages, &fail)) {
+ memcg->tcpmem_pressure = 0;
return true;
}
- page_counter_charge(&memcg->tcp_mem.memory_allocated, nr_pages);
- memcg->tcp_mem.memory_pressure = 1;
+ page_counter_charge(&memcg->tcpmem, nr_pages);
+ memcg->tcpmem_pressure = 1;
return false;
}
@@ -5631,8 +5629,7 @@ 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 (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) {
- page_counter_uncharge(&memcg->tcp_mem.memory_allocated,
- nr_pages);
+ page_counter_uncharge(&memcg->tcpmem, nr_pages);
return;
}
--
2.6.3
--
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