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Subject[PATCH v6 4/8] per-cgroup tcp buffers control
Date
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>
CC: 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 | 14 ++++
include/net/tcp.h | 17 +++++
mm/memcontrol.c | 141 ++++++++++++++++++++++++++++++++++++++++++++
net/core/sock.c | 39 +++++++++++-
net/ipv4/tcp.c | 47 +++++++--------
net/ipv4/tcp_ipv4.c | 11 ++++
net/ipv6/tcp_ipv6.c | 10 +++-
8 files changed, 255 insertions(+), 28 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 99a8ba2..a27dad9 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -393,6 +393,10 @@ void sock_update_memcg(struct sock *sk);
void sock_release_memcg(struct sock *sk);
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(const struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
+void tcp_destroy_cgroup(const struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
#else
/* memcontrol includes sockets.h, that includes memcontrol.h ... */
static inline void memcg_sockets_allocated_dec(struct mem_cgroup *memcg,
diff --git a/include/net/sock.h b/include/net/sock.h
index 163f87b..efd7664 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
@@ -819,6 +821,18 @@ struct proto {
/* Pointer to the per-cgroup version of the the sysctl_mem field */
long *(*prot_mem)(const 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)(const struct proto *prot,
+ struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
+ void (*destroy_cgroup)(const 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 eac7bf6..ec57cf2 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -31,6 +31,7 @@
#include <linux/crypto.h>
#include <linux/cryptohash.h>
#include <linux/kref.h>
+#include <linux/res_counter.h>

#include <net/inet_connection_sock.h>
#include <net/inet_timewait_sock.h>
@@ -255,6 +256,21 @@ 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 */
+ struct res_counter 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(const struct mem_cgroup *memcg);
+struct percpu_counter *sockets_allocated_tcp_nocg(const struct mem_cgroup *memcg);
+int *memory_pressure_tcp_nocg(const struct mem_cgroup *memcg);
+long memory_allocated_tcp_add_nocg(struct mem_cgroup *memcg, long val,
+ int *parent_status);
+
extern long *tcp_sysctl_mem(const struct mem_cgroup *memcg);
struct percpu_counter *sockets_allocated_tcp(const struct mem_cgroup *memcg);
int *memory_pressure_tcp(const struct mem_cgroup *memcg);
@@ -1023,6 +1039,7 @@ 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 ad55b28..efff83b 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
};

/* Stuffs for move charges at task migration. */
@@ -377,10 +384,12 @@ enum mem_type {
#define MEM_CGROUP_RECLAIM_SOFT (1 << MEM_CGROUP_RECLAIM_SOFT_BIT)

static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
+static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont);
/* Writing them here to avoid exposing memcg's inner layout */
#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)
{
@@ -426,6 +435,119 @@ 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);
+
+/*
+ * 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);
+
+#define CONSTCG(m) ((struct mem_cgroup *)(m))
+long *tcp_sysctl_mem(const struct mem_cgroup *memcg)
+{
+ return CONSTCG(memcg)->tcp.tcp_prot_mem;
+}
+EXPORT_SYMBOL(tcp_sysctl_mem);
+
+/*
+ * We will be passed a value in pages. But our limits are internally
+ * all in bytes. We need to convert it before testing the allocation,
+ * and convert it back when returning data to the network layer
+ */
+long memory_allocated_tcp_add(struct mem_cgroup *memcg, long val,
+ int *parent_status)
+{
+ int ret = 0;
+ struct res_counter *failed;
+
+ if (val > 0) {
+ val <<= PAGE_SHIFT;
+ ret = res_counter_charge(&memcg->tcp.tcp_memory_allocated,
+ val, &failed);
+ if (!ret)
+ *parent_status = UNDER_LIMIT;
+ else
+ *parent_status = OVER_LIMIT;
+ } else if (val < 0) {
+ if (*parent_status == OVER_LIMIT)
+ /*
+ * res_counter charge already surely uncharged the
+ * parent if something went wrong.
+ */
+ WARN_ON(1);
+ else {
+ val = (-val) << PAGE_SHIFT;
+ res_counter_uncharge(&memcg->tcp.tcp_memory_allocated,
+ val);
+ }
+ }
+
+ return res_counter_read_u64(&memcg->tcp.tcp_memory_allocated,
+ RES_USAGE) >> PAGE_SHIFT;
+}
+EXPORT_SYMBOL(memory_allocated_tcp_add);
+
+int *memory_pressure_tcp(const struct mem_cgroup *memcg)
+{
+ return &CONSTCG(memcg)->tcp.tcp_memory_pressure;
+}
+EXPORT_SYMBOL(memory_pressure_tcp);
+
+struct percpu_counter *sockets_allocated_tcp(const struct mem_cgroup *memcg)
+{
+ return &CONSTCG(memcg)->tcp.tcp_sockets_allocated;
+}
+EXPORT_SYMBOL(sockets_allocated_tcp);
+
+static void tcp_create_cgroup(struct mem_cgroup *cg, struct cgroup_subsys *ss)
+{
+ struct res_counter *parent_res_counter = NULL;
+ struct mem_cgroup *parent = parent_mem_cgroup(cg);
+
+ if (parent)
+ parent_res_counter = &parent->tcp.tcp_memory_allocated;
+
+ cg->tcp.tcp_memory_pressure = 0;
+ res_counter_init(&cg->tcp.tcp_memory_allocated, parent_res_counter);
+ percpu_counter_init(&cg->tcp.tcp_sockets_allocated, 0);
+}
+
+int tcp_init_cgroup(const struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss)
+{
+ struct mem_cgroup *memcg = 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
+ */
+ memcg->tcp.tcp_prot_mem[0] = sysctl_tcp_mem[0];
+ memcg->tcp.tcp_prot_mem[1] = sysctl_tcp_mem[1];
+ memcg->tcp.tcp_prot_mem[2] = sysctl_tcp_mem[2];
+
+ return 0;
+}
+EXPORT_SYMBOL(tcp_init_cgroup);
+
+void tcp_destroy_cgroup(const struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+
+ percpu_counter_destroy(&memcg->tcp.tcp_sockets_allocated);
+}
+EXPORT_SYMBOL(tcp_destroy_cgroup);
+#undef CONSTCG
#endif /* CONFIG_INET */
#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */

@@ -4835,14 +4957,27 @@ static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)

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)
{
return 0;
}
+
+static void kmem_cgroup_destroy(struct cgroup_subsys *ss,
+ struct cgroup *cont)
+{
+}
#endif

static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
@@ -5060,6 +5195,10 @@ 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);
@@ -5085,6 +5224,8 @@ 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 22ef143..3fa3ccb 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(proto_list);
-
#ifdef CONFIG_PROC_FS
#define PROTO_INUSE_NR 64 /* should be enough for the first time */
struct prot_inuse {
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index dc8f01e..259f6d9 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -290,13 +290,6 @@ EXPORT_SYMBOL(sysctl_tcp_mem);
EXPORT_SYMBOL(sysctl_tcp_rmem);
EXPORT_SYMBOL(sysctl_tcp_wmem);

-atomic_long_t tcp_memory_allocated; /* Current allocated memory. */
-
-/*
- * Current number of TCP sockets.
- */
-struct percpu_counter tcp_sockets_allocated;
-
/*
* TCP splice context
*/
@@ -306,47 +299,51 @@ struct tcp_splice_state {
unsigned int flags;
};

-/*
- * 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.
- */
+/* Current number of TCP sockets. */
+struct percpu_counter tcp_sockets_allocated;
+atomic_long_t tcp_memory_allocated; /* Current allocated memory. */
int tcp_memory_pressure __read_mostly;

-int *memory_pressure_tcp(const struct mem_cgroup *memcg)
+int *memory_pressure_tcp_nocg(const struct mem_cgroup *memcg)
{
return &tcp_memory_pressure;
}
-EXPORT_SYMBOL(memory_pressure_tcp);
+EXPORT_SYMBOL(memory_pressure_tcp_nocg);

-struct percpu_counter *sockets_allocated_tcp(const struct mem_cgroup *memcg)
+struct percpu_counter
+*sockets_allocated_tcp_nocg(const struct mem_cgroup *memcg)
{
return &tcp_sockets_allocated;
}
-EXPORT_SYMBOL(sockets_allocated_tcp);
+EXPORT_SYMBOL(sockets_allocated_tcp_nocg);

-void tcp_enter_memory_pressure(struct sock *sk)
+/*
+ * 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_nocg(struct sock *sk)
{
if (!tcp_memory_pressure) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMEMORYPRESSURES);
tcp_memory_pressure = 1;
}
}
-EXPORT_SYMBOL(tcp_enter_memory_pressure);
+EXPORT_SYMBOL(tcp_enter_memory_pressure_nocg);

-long *tcp_sysctl_mem(const struct mem_cgroup *memcg)
+long *tcp_sysctl_mem_nocg(const struct mem_cgroup *memcg)
{
return sysctl_tcp_mem;
}
-EXPORT_SYMBOL(tcp_sysctl_mem);
+EXPORT_SYMBOL(tcp_sysctl_mem_nocg);

-long memory_allocated_tcp_add(struct mem_cgroup *memcg, long val,
- int *parent_status)
+long memory_allocated_tcp_add_nocg(struct mem_cgroup *memcg, long val,
+ int *parent_status)
{
return atomic_long_add_return(val, &tcp_memory_allocated);
}
-EXPORT_SYMBOL(memory_allocated_tcp_add);
+EXPORT_SYMBOL(memory_allocated_tcp_add_nocg);

/* Convert seconds to retransmits based on initial and max timeout */
static u8 secs_to_retrans(int seconds, int timeout, int rto_max)
@@ -3248,7 +3245,9 @@ void __init tcp_init(void)

BUILD_BUG_ON(sizeof(struct tcp_skb_cb) > sizeof(skb->cb));

+#ifndef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
percpu_counter_init(&tcp_sockets_allocated, 0);
+#endif
percpu_counter_init(&tcp_orphan_count, 0);
tcp_hashinfo.bind_bucket_cachep =
kmem_cache_create("tcp_bind_bucket",
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 7072060..aac71e9 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2607,12 +2607,23 @@ struct proto tcp_prot = {
.hash = inet_hash,
.unhash = inet_unhash,
.get_port = inet_csk_get_port,
+ .orphan_count = &tcp_orphan_count,
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+ .init_cgroup = tcp_init_cgroup,
+ .destroy_cgroup = tcp_destroy_cgroup,
.enter_memory_pressure = tcp_enter_memory_pressure,
.memory_pressure = memory_pressure_tcp,
.sockets_allocated = sockets_allocated_tcp,
.orphan_count = &tcp_orphan_count,
.mem_allocated_add = memory_allocated_tcp_add,
.prot_mem = tcp_sysctl_mem,
+#else
+ .enter_memory_pressure = tcp_enter_memory_pressure_nocg,
+ .memory_pressure = memory_pressure_tcp_nocg,
+ .sockets_allocated = sockets_allocated_tcp_nocg,
+ .mem_allocated_add = memory_allocated_tcp_add_nocg,
+ .prot_mem = tcp_sysctl_mem_nocg,
+#endif
.sysctl_wmem = sysctl_tcp_wmem,
.sysctl_rmem = sysctl_tcp_rmem,
.max_header = MAX_TCP_HEADER,
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index bdc0003..0a52587 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -2200,12 +2200,20 @@ struct proto tcpv6_prot = {
.hash = tcp_v6_hash,
.unhash = inet_unhash,
.get_port = inet_csk_get_port,
+ .orphan_count = &tcp_orphan_count,
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
.enter_memory_pressure = tcp_enter_memory_pressure,
.sockets_allocated = sockets_allocated_tcp,
.mem_allocated_add = memory_allocated_tcp_add,
.memory_pressure = memory_pressure_tcp,
- .orphan_count = &tcp_orphan_count,
.prot_mem = tcp_sysctl_mem,
+#else
+ .enter_memory_pressure = tcp_enter_memory_pressure_nocg,
+ .sockets_allocated = sockets_allocated_tcp_nocg,
+ .mem_allocated_add = memory_allocated_tcp_add_nocg,
+ .memory_pressure = memory_pressure_tcp_nocg,
+ .prot_mem = tcp_sysctl_mem_nocg,
+#endif
.sysctl_wmem = sysctl_tcp_wmem,
.sysctl_rmem = sysctl_tcp_rmem,
.max_header = MAX_TCP_HEADER,
--
1.7.6.4


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