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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@virtuozzo.com>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2016-01-20 15:02:50 -08:00 committed by Linus Torvalds
parent d886f4e483
commit 0db1529817
2 changed files with 21 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
include/linux/memcontrol.h
View File

@ -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))

33
mm/memcontrol.c
View File

@ -2843,7 +2843,7 @@ 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();
@ -3028,11 +3028,11 @@ 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
@ -3050,7 +3050,7 @@ 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);
@ -3119,7 +3119,7 @@ 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();
@ -4295,8 +4295,7 @@ 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
@ -4308,7 +4307,7 @@ 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
@ -4374,7 +4373,7 @@ 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);
@ -5601,7 +5600,7 @@ 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;
@ -5629,15 +5628,14 @@ 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;
}
@ -5660,8 +5658,7 @@ 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;
}