Home » Mailing lists » Devel » [PATCH v5 0/8] per-cgroup tcp buffer pressure settings
| [PATCH v5 4/8] per-cgroup tcp buffers control [message #43648 is a reply to message #43642] |
Tue, 04 October 2011 12:17   |
Glauber Costa
Messages: 916
Registered: October 2011
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Senior Member |
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With all the infrastructure in place, this patch implements
per-cgroup control for tcp memory pressure handling.
Signed-off-by: Glauber Costa <glommer@parallels.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujtisu.com>
CC: David S. Miller <davem@davemloft.net>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
include/linux/memcontrol.h | 4 ++
include/net/sock.h | 15 ++++++-
include/net/tcp.h | 15 +++++++
mm/memcontrol.c | 97 ++++++++++++++++++++++++++++++++++++++++++++
net/core/sock.c | 39 ++++++++++++++++-
net/ipv4/tcp.c | 44 +++++++++----------
net/ipv4/tcp_ipv4.c | 12 +++++-
net/ipv6/tcp_ipv6.c | 10 ++++-
8 files changed, 207 insertions(+), 29 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 2012060..50af61d 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -391,6 +391,10 @@ void memcg_sock_mem_alloc(struct mem_cgroup *memcg, struct proto *prot,
void memcg_sock_mem_free(struct mem_cgroup *memcg, struct proto *prot, int amt);
void memcg_sockets_allocated_dec(struct mem_cgroup *memcg, struct proto *prot);
void memcg_sockets_allocated_inc(struct mem_cgroup *memcg, struct proto *prot);
+int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
+void tcp_destroy_cgroup(struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
#else
/* memcontrol includes sockets.h, that includes memcontrol.h ... */
static inline void memcg_sock_mem_alloc(struct mem_cgroup *memcg,
diff --git a/include/net/sock.h b/include/net/sock.h
index c6983cf..0625d79 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -64,6 +64,8 @@
#include <net/dst.h>
#include <net/checksum.h>
+int sockets_populate(struct cgroup *cgrp, struct cgroup_subsys *ss);
+void sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss);
/*
* This structure really needs to be cleaned up.
* Most of it is for TCP, and not used by any of
@@ -814,7 +816,18 @@ struct proto {
int *(*memory_pressure)(struct mem_cgroup *memcg);
/* Pointer to the per-cgroup version of the the sysctl_mem field */
long *(*prot_mem)(struct mem_cgroup *memcg);
-
+ /*
+ * cgroup specific init/deinit functions. Called once for all
+ * protocols that implement it, from cgroups populate function.
+ * This function has to setup any files the protocol want to
+ * appear in the kmem cgroup filesystem.
+ */
+ int (*init_cgroup)(struct proto *prot,
+ struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
+ void (*destroy_cgroup)(struct proto *prot,
+ struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
int *sysctl_wmem;
int *sysctl_rmem;
int max_header;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 2cbbc13..7ae7b4b 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -255,6 +255,20 @@ extern int sysctl_tcp_thin_linear_timeouts;
extern int sysctl_tcp_thin_dupack;
struct mem_cgroup;
+struct tcp_memcontrol {
+ /* per-cgroup tcp memory pressure knobs */
+ atomic_long_t tcp_memory_allocated;
+ struct percpu_counter tcp_sockets_allocated;
+ /* those two are read-mostly, leave them at the end */
+ long tcp_prot_mem[3];
+ int tcp_memory_pressure;
+};
+
+extern long *tcp_sysctl_mem_nocg(struct mem_cgroup *memcg);
+struct percpu_counter *sockets_allocated_tcp_nocg(struct mem_cgroup *memcg);
+int *memory_pressure_tcp_nocg(struct mem_cgroup *memcg);
+atomic_long_t *memory_allocated_tcp_nocg(struct mem_cgroup *memcg);
+
extern long *tcp_sysctl_mem(struct mem_cgroup *memcg);
struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *memcg);
int *memory_pressure_tcp(struct mem_cgroup *memcg);
@@ -1022,6 +1036,7 @@ static inline void tcp_openreq_init(struct request_sock *req,
ireq->loc_port = tcp_hdr(skb)->dest;
}
+extern void tcp_enter_memory_pressure_nocg(struct sock *sk);
extern void tcp_enter_memory_pressure(struct sock *sk);
static inline int keepalive_intvl_when(const struct tcp_sock *tp)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 60ab41d..9598e3e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -49,6 +49,9 @@
#include <linux/cpu.h>
#include <linux/oom.h>
#include "internal.h"
+#ifdef CONFIG_INET
+#include <net/tcp.h>
+#endif
#include <asm/uaccess.h>
@@ -294,6 +297,10 @@ struct mem_cgroup {
*/
struct mem_cgroup_stat_cpu nocpu_base;
spinlock_t pcp_counter_lock;
+
+#ifdef CONFIG_INET
+ struct tcp_memcontrol tcp;
+#endif
};
static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
@@ -301,6 +308,7 @@ static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
#ifdef CONFIG_INET
#include <net/sock.h>
+#include <net/ip.h>
void sock_update_memcg(struct sock *sk)
{
@@ -373,6 +381,80 @@ void memcg_sockets_allocated_inc(struct mem_cgroup *memcg, struct proto *prot)
percpu_counter_inc(prot->sockets_allocated(memcg));
}
EXPORT_SYMBOL(memcg_sockets_allocated_inc);
+
+static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont);
+/*
+ * Pressure flag: try to collapse.
+ * Technical note: it is used by multiple contexts non atomically.
+ * All the __sk_mem_schedule() is of this nature: accounting
+ * is strict, actions are advisory and have some latency.
+ */
+void tcp_enter_memory_pressure(struct sock *sk)
+{
+ struct mem_cgroup *memcg = sk->sk_cgrp;
+ if (!memcg->tcp.tcp_memory_pressure) {
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMEMORYPRESSURES);
+ memcg->tcp.tcp_memory_pressure = 1;
+ }
+}
+EXPORT_SYMBOL(tcp_enter_memory_pressure);
+
+long *tcp_sysctl_mem(struct mem_cgroup *cg)
+{
+ return cg->tcp.tcp_prot_mem;
+}
+EXPORT_SYMBOL(tcp_sysctl_mem);
+
+atomic_long_t *memory_allocated_tcp(struct mem_cgroup *cg)
+{
+ return &(cg->tcp.tcp_memory_allocated);
+}
+EXPORT_SYMBOL(memory_allocated_tcp);
+
+int *memory_pressure_tcp(struct mem_cgroup *memcg)
+{
+ return &memcg->tcp.tcp_memory_pressure;
+}
+EXPORT_SYMBOL(memory_pressure_tcp);
+
+struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *memcg)
+{
+ return &memcg->tcp.tcp_sockets_allocated;
+}
+EXPORT_SYMBOL(sockets_allocated_tcp);
+
+static void tcp_create_cgroup(struct mem_cgroup *cg, struct cgroup_subsys *ss)
+{
+ cg->tcp.tcp_memory_pressure = 0;
+ atomic_long_set(&cg->tcp.tcp_memory_allocated, 0);
+ percpu_counter_init(&cg->tcp.tcp_sockets_allocated, 0);
+}
+
+int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss)
+{
+ struct mem_cgroup *cg = mem_cgroup_from_cont(cgrp);
+ /*
+ * We need to initialize it at populate, not create time.
+ * This is because net sysctl tables are not up until much
+ * later
+ */
+ cg->tcp.tcp_prot_mem[0] = sysctl_tcp_mem[0];
+ cg->tcp.tcp_prot_mem[1] = sysctl_tcp_mem[1];
+ cg->tcp.tcp_prot_mem[2] = sysctl_tcp_mem[2];
+
+ return 0;
+}
+EXPORT_SYMBOL(tcp_init_cgroup);
+
+void tcp_destroy_cgroup(struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss)
+{
+ struct mem_cgroup *cg = mem_cgroup_from_cont(cgrp);
+
+ percpu_counter_destroy(&cg->tcp.tcp_sockets_allocated);
+}
+EXPORT_SYMBOL(tcp_destroy_cgroup);
#endif /* CONFIG_INET */
#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
@@ -4864,9 +4946,18 @@ static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
if (!mem_cgroup_is_root(memcg))
ret = cgroup_add_files(cont, ss, kmem_cgroup_files,
ARRAY_SIZE(kmem_cgroup_files));
+
+ if (!ret)
+ ret = sockets_populate(cont, ss);
+
return ret;
};
+static void kmem_cgroup_destroy(struct cgroup_subsys *ss,
+ struct cgroup *cont)
+{
+ sockets_destroy(cont, ss);
+}
#else
static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
{
@@ -5089,6 +5180,10 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
mem->last_scanned_node = MAX_NUMNODES;
INIT_LIST_HEAD(&mem->oom_notify);
+#if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_INET)
+ tcp_create_cgroup(mem, ss);
+#endif
+
if (parent)
mem->swappiness = mem_cgroup_swappiness(parent);
atomic_set(&mem->refcnt, 1);
@@ -5114,6 +5209,8 @@ static void mem_cgroup_destroy(struct cgroup_subsys *ss,
{
struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
+ kmem_cgroup_destroy(ss, cont);
+
mem_cgroup_put(mem);
}
diff --git a/net/core/sock.c b/net/core/sock.c
index 6e3ace7..ef3a9a4 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -135,6 +135,42 @@
#include <net/tcp.h>
#endif
+static DEFINE_RWLOCK(proto_list_lock);
+static LIST_HEAD(proto_list);
+
+int sockets_populate(struct cgroup *cgrp, struct cgroup_subsys *ss)
+{
+ struct proto *proto;
+ int ret = 0;
+
+ read_lock(&proto_list_lock);
+ list_for_each_entry(proto, &proto_list, node) {
+ if (proto->init_cgroup)
+ ret = proto->init_cgroup(proto, cgrp, ss);
+ if (ret)
+ goto out;
+ }
+
+ read_unlock(&proto_list_lock);
+ return ret;
+out:
+ list_for_each_entry_continue_reverse(proto, &proto_list, node)
+ if (proto->destroy_cgroup)
+ proto->destroy_cgroup(proto, cgrp, ss);
+ read_unlock(&proto_list_lock);
+ return ret;
+}
+
+void sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss)
+{
+ struct proto *proto;
+ read_lock(&proto_list_lock);
+ list_for_each_entry_reverse(proto, &proto_list, node)
+ if (proto->destroy_cgroup)
+ proto->destroy_cgroup(proto, cgrp, ss);
+ read_unlock(&proto_list_lock);
+}
+
/*
* Each address family might have different locking rules, so we have
* one slock key per address family:
@@ -2262,9 +2298,6 @@ void sk_common_release(struct sock *sk)
}
EXPORT_SYMBOL(sk_common_release);
-static DEFINE_RWLOCK(proto_list_lock);
-static LIST_HEAD(prot
...
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