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net: tcp_memcontrol: simplify the per-memcg limit access

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tcp_memcontrol replicates the global sysctl_mem limit array per cgroup,
but it only ever sets these entries to the value of the memory_allocated
page_counter limit.  Use the latter directly.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: David S. Miller <davem@davemloft.net>
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 2016-01-14 15:21:11 -08:00 committed by Linus Torvalds
parent af95d7df40
commit 80f23124f5
3 changed files with 5 additions and 12 deletions
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1
include/linux/memcontrol.h
View File

@ -89,7 +89,6 @@ struct cg_proto {
struct page_counter memory_allocated; /* Current allocated memory. */
int memory_pressure;
bool active;
long sysctl_mem[3];
/*
* memcg field is used to find which memcg we belong directly
* Each memcg struct can hold more than one cg_proto, so container_of

8
include/net/sock.h
View File

@ -1162,10 +1162,12 @@ static inline void sk_enter_memory_pressure(struct sock *sk)
static inline long sk_prot_mem_limits(const struct sock *sk, int index)
{
long *prot = sk->sk_prot->sysctl_mem;
long limit = sk->sk_prot->sysctl_mem[index];
if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
prot = sk->sk_cgrp->sysctl_mem;
return prot[index];
limit = min_t(long, limit, sk->sk_cgrp->memory_allocated.limit);
return limit;
}
static inline void memcg_memory_allocated_add(struct cg_proto *prot,

8
net/ipv4/tcp_memcontrol.c
View File

@ -21,9 +21,6 @@ int tcp_init_cgroup(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
if (!cg_proto)
return 0;
cg_proto->sysctl_mem[0] = sysctl_tcp_mem[0];
cg_proto->sysctl_mem[1] = sysctl_tcp_mem[1];
cg_proto->sysctl_mem[2] = sysctl_tcp_mem[2];
cg_proto->memory_pressure = 0;
cg_proto->memcg = memcg;
@ -54,7 +51,6 @@ EXPORT_SYMBOL(tcp_destroy_cgroup);
static int tcp_update_limit(struct mem_cgroup *memcg, unsigned long nr_pages)
{
struct cg_proto *cg_proto;
int i;
int ret;
cg_proto = tcp_prot.proto_cgroup(memcg);
@ -65,10 +61,6 @@ static int tcp_update_limit(struct mem_cgroup *memcg, unsigned long nr_pages)
if (ret)
return ret;
for (i = 0; i < 3; i++)
cg_proto->sysctl_mem[i] = min_t(long, nr_pages,
sysctl_tcp_mem[i]);
if (!cg_proto->active) {
/*
* The active flag needs to be written after the static_key