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net: drop tcp_memcontrol.c 

tcp_memcontrol.c only contains legacy memory.tcp.kmem.* file definitions
and mem_cgroup->tcp_mem init/destroy stuff.  This doesn't belong to
network subsys.  Let's move it to memcontrol.c.  This also allows us to
reuse generic code for handling legacy memcg files.

Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: "David S. Miller" <davem@davemloft.net>
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>
This commit is contained in:
Vladimir Davydov 2016-01-20 15:02:44 -08:00 committed by Linus Torvalds
parent 489c2a20a4
commit d55f90bfab
7 changed files with 90 additions and 222 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
include/net/tcp_memcontrol.h
View File

@ -1,10 +0,0 @@
#ifndef _TCP_MEMCG_H
#define _TCP_MEMCG_H
struct cgroup_subsys;
struct mem_cgroup;
int tcp_init_cgroup(struct mem_cgroup *memcg);
void tcp_destroy_cgroup(struct mem_cgroup *memcg);
#endif /* _TCP_MEMCG_H */

98
mm/memcontrol.c
View File

@ -66,7 +66,6 @@
#include "internal.h"
#include <net/sock.h>
#include <net/ip.h>
#include <net/tcp_memcontrol.h>
#include "slab.h"
#include <asm/uaccess.h>
@ -242,6 +241,7 @@ enum res_type {
_MEMSWAP,
_OOM_TYPE,
_KMEM,
_TCP,
};
#define MEMFILE_PRIVATE(x, val) ((x) << 16 | (val))
@ -2842,6 +2842,11 @@ static u64 mem_cgroup_read_u64(struct cgroup_subsys_state *css,
case _KMEM:
counter = &memcg->kmem;
break;
#if defined(CONFIG_MEMCG_LEGACY_KMEM) && defined(CONFIG_INET)
case _TCP:
counter = &memcg->tcp_mem.memory_allocated;
break;
#endif
default:
BUG();
}
@ -3028,6 +3033,48 @@ static int memcg_update_kmem_limit(struct mem_cgroup *memcg,
#endif /* CONFIG_MEMCG_LEGACY_KMEM */
#if defined(CONFIG_MEMCG_LEGACY_KMEM) && defined(CONFIG_INET)
static int memcg_update_tcp_limit(struct mem_cgroup *memcg, unsigned long limit)
{
int ret;
mutex_lock(&memcg_limit_mutex);
ret = page_counter_limit(&memcg->tcp_mem.memory_allocated, limit);
if (ret)
goto out;
if (!memcg->tcp_mem.active) {
/*
* The active flag needs to be written after the static_key
* update. This is what guarantees that the socket activation
* function is the last one to run. See sock_update_memcg() for
* details, and note that we don't mark any socket as belonging
* to this memcg until that flag is up.
*
* We need to do this, because static_keys will span multiple
* sites, but we can't control their order. If we mark a socket
* as accounted, but the accounting functions are not patched in
* yet, we'll lose accounting.
*
* We never race with the readers in sock_update_memcg(),
* because when this value change, the code to process it is not
* patched in yet.
*/
static_branch_inc(&memcg_sockets_enabled_key);
memcg->tcp_mem.active = true;
}
out:
mutex_unlock(&memcg_limit_mutex);
return ret;
}
#else
static int memcg_update_tcp_limit(struct mem_cgroup *memcg, unsigned long limit)
{
return -EINVAL;
}
#endif /* CONFIG_MEMCG_LEGACY_KMEM && CONFIG_INET */
/*
* The user of this function is...
* RES_LIMIT.
@ -3060,6 +3107,9 @@ static ssize_t mem_cgroup_write(struct kernfs_open_file *of,
case _KMEM:
ret = memcg_update_kmem_limit(memcg, nr_pages);
break;
case _TCP:
ret = memcg_update_tcp_limit(memcg, nr_pages);
break;
}
break;
case RES_SOFT_LIMIT:
@ -3086,6 +3136,11 @@ static ssize_t mem_cgroup_reset(struct kernfs_open_file *of, char *buf,
case _KMEM:
counter = &memcg->kmem;
break;
#if defined(CONFIG_MEMCG_LEGACY_KMEM) && defined(CONFIG_INET)
case _TCP:
counter = &memcg->tcp_mem.memory_allocated;
break;
#endif
default:
BUG();
}
@ -4072,6 +4127,31 @@ static struct cftype mem_cgroup_legacy_files[] = {
.seq_show = memcg_slab_show,
},
#endif
#ifdef CONFIG_INET
{
.name = "kmem.tcp.limit_in_bytes",
.private = MEMFILE_PRIVATE(_TCP, RES_LIMIT),
.write = mem_cgroup_write,
.read_u64 = mem_cgroup_read_u64,
},
{
.name = "kmem.tcp.usage_in_bytes",
.private = MEMFILE_PRIVATE(_TCP, RES_USAGE),
.read_u64 = mem_cgroup_read_u64,
},
{
.name = "kmem.tcp.failcnt",
.private = MEMFILE_PRIVATE(_TCP, RES_FAILCNT),
.write = mem_cgroup_reset,
.read_u64 = mem_cgroup_read_u64,
},
{
.name = "kmem.tcp.max_usage_in_bytes",
.private = MEMFILE_PRIVATE(_TCP, RES_MAX_USAGE),
.write = mem_cgroup_reset,
.read_u64 = mem_cgroup_read_u64,
},
#endif
#endif
{ }, /* terminate */
};
@ -4241,6 +4321,10 @@ 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);
#if defined(CONFIG_MEMCG_LEGACY_KMEM) && defined(CONFIG_INET)
page_counter_init(&memcg->tcp_mem.memory_allocated,
&parent->tcp_mem.memory_allocated);
#endif
/*
* No need to take a reference to the parent because cgroup
@ -4252,6 +4336,9 @@ 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);
#if defined(CONFIG_MEMCG_LEGACY_KMEM) && defined(CONFIG_INET)
page_counter_init(&memcg->tcp_mem.memory_allocated, NULL);
#endif
/*
* Deeper hierachy with use_hierarchy == false doesn't make
* much sense so let cgroup subsystem know about this
@ -4267,12 +4354,6 @@ mem_cgroup_css_online(struct cgroup_subsys_state *css)
return ret;
#ifdef CONFIG_INET
#ifdef CONFIG_MEMCG_LEGACY_KMEM
ret = tcp_init_cgroup(memcg);
if (ret)
return ret;
#endif
if (cgroup_subsys_on_dfl(memory_cgrp_subsys) && !cgroup_memory_nosocket)
static_branch_inc(&memcg_sockets_enabled_key);
#endif
@ -4330,7 +4411,8 @@ static void mem_cgroup_css_free(struct cgroup_subsys_state *css)
memcg_free_kmem(memcg);
#if defined(CONFIG_MEMCG_LEGACY_KMEM) && defined(CONFIG_INET)
tcp_destroy_cgroup(memcg);
if (memcg->tcp_mem.active)
static_branch_dec(&memcg_sockets_enabled_key);
#endif
__mem_cgroup_free(memcg);

1
net/ipv4/Makefile
View File

@ -56,7 +56,6 @@ obj-$(CONFIG_TCP_CONG_SCALABLE) += tcp_scalable.o
obj-$(CONFIG_TCP_CONG_LP) += tcp_lp.o
obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o
obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o
obj-$(CONFIG_MEMCG_LEGACY_KMEM) += tcp_memcontrol.o
obj-$(CONFIG_NETLABEL) += cipso_ipv4.o
obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \

1
net/ipv4/sysctl_net_ipv4.c
View File

@ -24,7 +24,6 @@
#include <net/cipso_ipv4.h>
#include <net/inet_frag.h>
#include <net/ping.h>
#include <net/tcp_memcontrol.h>
static int zero;
static int one = 1;

1
net/ipv4/tcp_ipv4.c
View File

@ -73,7 +73,6 @@
#include <net/timewait_sock.h>
#include <net/xfrm.h>
#include <net/secure_seq.h>
#include <net/tcp_memcontrol.h>
#include <net/busy_poll.h>
#include <linux/inet.h>

200
net/ipv4/tcp_memcontrol.c
View File

@ -1,200 +0,0 @@
#include <net/tcp.h>
#include <net/tcp_memcontrol.h>
#include <net/sock.h>
#include <net/ip.h>
#include <linux/nsproxy.h>
#include <linux/memcontrol.h>
#include <linux/module.h>
int tcp_init_cgroup(struct mem_cgroup *memcg)
{
struct mem_cgroup *parent = parent_mem_cgroup(memcg);
struct page_counter *counter_parent = NULL;
/*
* The root cgroup does not use page_counters, but rather,
* rely on the data already collected by the network
* subsystem
*/
if (memcg == root_mem_cgroup)
return 0;
memcg->tcp_mem.memory_pressure = 0;
if (parent)
counter_parent = &parent->tcp_mem.memory_allocated;
page_counter_init(&memcg->tcp_mem.memory_allocated, counter_parent);
return 0;
}
void tcp_destroy_cgroup(struct mem_cgroup *memcg)
{
if (memcg == root_mem_cgroup)
return;
if (memcg->tcp_mem.active)
static_branch_dec(&memcg_sockets_enabled_key);
}
static int tcp_update_limit(struct mem_cgroup *memcg, unsigned long nr_pages)
{
int ret;
if (memcg == root_mem_cgroup)
return -EINVAL;
ret = page_counter_limit(&memcg->tcp_mem.memory_allocated, nr_pages);
if (ret)
return ret;
if (!memcg->tcp_mem.active) {
/*
* The active flag needs to be written after the static_key
* update. This is what guarantees that the socket activation
* function is the last one to run. See sock_update_memcg() for
* details, and note that we don't mark any socket as belonging
* to this memcg until that flag is up.
*
* We need to do this, because static_keys will span multiple
* sites, but we can't control their order. If we mark a socket
* as accounted, but the accounting functions are not patched in
* yet, we'll lose accounting.
*
* We never race with the readers in sock_update_memcg(),
* because when this value change, the code to process it is not
* patched in yet.
*/
static_branch_inc(&memcg_sockets_enabled_key);
memcg->tcp_mem.active = true;
}
return 0;
}
enum {
RES_USAGE,
RES_LIMIT,
RES_MAX_USAGE,
RES_FAILCNT,
};
static DEFINE_MUTEX(tcp_limit_mutex);
static ssize_t tcp_cgroup_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
unsigned long nr_pages;
int ret = 0;
buf = strstrip(buf);
switch (of_cft(of)->private) {
case RES_LIMIT:
/* see memcontrol.c */
ret = page_counter_memparse(buf, "-1", &nr_pages);
if (ret)
break;
mutex_lock(&tcp_limit_mutex);
ret = tcp_update_limit(memcg, nr_pages);
mutex_unlock(&tcp_limit_mutex);
break;
default:
ret = -EINVAL;
break;
}
return ret ?: nbytes;
}
static u64 tcp_cgroup_read(struct cgroup_subsys_state *css, struct cftype *cft)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
u64 val;
switch (cft->private) {
case RES_LIMIT:
if (memcg == root_mem_cgroup)
val = PAGE_COUNTER_MAX;
else
val = memcg->tcp_mem.memory_allocated.limit;
val *= PAGE_SIZE;
break;
case RES_USAGE:
if (memcg == root_mem_cgroup)
val = atomic_long_read(&tcp_memory_allocated);
else
val = page_counter_read(&memcg->tcp_mem.memory_allocated);
val *= PAGE_SIZE;
break;
case RES_FAILCNT:
if (memcg == root_mem_cgroup)
return 0;
val = memcg->tcp_mem.memory_allocated.failcnt;
break;
case RES_MAX_USAGE:
if (memcg == root_mem_cgroup)
return 0;
val = memcg->tcp_mem.memory_allocated.watermark;
val *= PAGE_SIZE;
break;
default:
BUG();
}
return val;
}
static ssize_t tcp_cgroup_reset(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
struct mem_cgroup *memcg;
memcg = mem_cgroup_from_css(of_css(of));
if (memcg == root_mem_cgroup)
return nbytes;
switch (of_cft(of)->private) {
case RES_MAX_USAGE:
page_counter_reset_watermark(&memcg->tcp_mem.memory_allocated);
break;
case RES_FAILCNT:
memcg->tcp_mem.memory_allocated.failcnt = 0;
break;
}
return nbytes;
}
static struct cftype tcp_files[] = {
{
.name = "kmem.tcp.limit_in_bytes",
.write = tcp_cgroup_write,
.read_u64 = tcp_cgroup_read,
.private = RES_LIMIT,
},
{
.name = "kmem.tcp.usage_in_bytes",
.read_u64 = tcp_cgroup_read,
.private = RES_USAGE,
},
{
.name = "kmem.tcp.failcnt",
.private = RES_FAILCNT,
.write = tcp_cgroup_reset,
.read_u64 = tcp_cgroup_read,
},
{
.name = "kmem.tcp.max_usage_in_bytes",
.private = RES_MAX_USAGE,
.write = tcp_cgroup_reset,
.read_u64 = tcp_cgroup_read,
},
{ } /* terminate */
};
static int __init tcp_memcontrol_init(void)
{
WARN_ON(cgroup_add_legacy_cftypes(&memory_cgrp_subsys, tcp_files));
return 0;
}
__initcall(tcp_memcontrol_init);

1
net/ipv6/tcp_ipv6.c
View File

@ -61,7 +61,6 @@
#include <net/timewait_sock.h>
#include <net/inet_common.h>
#include <net/secure_seq.h>
#include <net/tcp_memcontrol.h>
#include <net/busy_poll.h>
#include <linux/proc_fs.h>