[PATCH v7 5/8] per-netns ipv4 sysctl_tcp_mem

[Glauber Costa <glommer@parallels.com>]

This patch allows each namespace to independently set up
its levels for tcp memory pressure thresholds. This patch
alone does not buy much: we need to make this values
per group of process somehow. This is achieved in the
patches that follows in this patchset.

Signed-off-by: Glauber Costa <glommer@parallels.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
CC: David S. Miller <davem@davemloft.net>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
 include/net/netns/ipv4.h   |    1 +
 include/net/tcp.h          |    1 -
 mm/memcontrol.c            |    8 ++++--
 net/ipv4/sysctl_net_ipv4.c |   51 +++++++++++++++++++++++++++++++++++++------
 net/ipv4/tcp.c             |   13 ++--------
 5 files changed, 53 insertions(+), 21 deletions(-)

diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index d786b4f..bbd023a 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -55,6 +55,7 @@ struct netns_ipv4 {
 	int current_rt_cache_rebuild_count;
 
 	unsigned int sysctl_ping_group_range[2];
+	long sysctl_tcp_mem[3];
 
 	atomic_t rt_genid;
 	atomic_t dev_addr_genid;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index ec57cf2..3609d87 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -232,7 +232,6 @@ extern int sysctl_tcp_fack;
 extern int sysctl_tcp_reordering;
 extern int sysctl_tcp_ecn;
 extern int sysctl_tcp_dsack;
-extern long sysctl_tcp_mem[3];
 extern int sysctl_tcp_wmem[3];
 extern int sysctl_tcp_rmem[3];
 extern int sysctl_tcp_app_win;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 4e79171..f953b32 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -390,6 +390,7 @@ static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont);
 #ifdef CONFIG_INET
 #include <net/sock.h>
 #include <net/ip.h>
+#include <linux/nsproxy.h>
 
 void sock_update_memcg(struct sock *sk)
 {
@@ -526,14 +527,15 @@ int tcp_init_cgroup(const struct proto *prot, struct cgroup *cgrp,
 		    struct cgroup_subsys *ss)
 {
 	struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+	struct net *net = current->nsproxy->net_ns;
 	/*
 	 * 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];
+	memcg->tcp.tcp_prot_mem[0] = net->ipv4.sysctl_tcp_mem[0];
+	memcg->tcp.tcp_prot_mem[1] = net->ipv4.sysctl_tcp_mem[1];
+	memcg->tcp.tcp_prot_mem[2] = net->ipv4.sysctl_tcp_mem[2];
 
 	return 0;
 }
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 69fd720..bbd67ab 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -14,6 +14,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/nsproxy.h>
+#include <linux/swap.h>
 #include <net/snmp.h>
 #include <net/icmp.h>
 #include <net/ip.h>
@@ -174,6 +175,36 @@ static int proc_allowed_congestion_control(ctl_table *ctl,
 	return ret;
 }
 
+static int ipv4_tcp_mem(ctl_table *ctl, int write,
+			   void __user *buffer, size_t *lenp,
+			   loff_t *ppos)
+{
+	int ret;
+	unsigned long vec[3];
+	struct net *net = current->nsproxy->net_ns;
+
+	ctl_table tmp = {
+		.data = &vec,
+		.maxlen = sizeof(vec),
+		.mode = ctl->mode,
+	};
+
+	if (!write) {
+		ctl->data = &net->ipv4.sysctl_tcp_mem;
+		return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
+	}
+
+	ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
+	if (ret)
+		return ret;
+
+	net->ipv4.sysctl_tcp_mem[0] = vec[0];
+	net->ipv4.sysctl_tcp_mem[1] = vec[1];
+	net->ipv4.sysctl_tcp_mem[2] = vec[2];
+
+	return 0;
+}
+
 static struct ctl_table ipv4_table[] = {
 	{
 		.procname	= "tcp_timestamps",
@@ -433,13 +464,6 @@ static struct ctl_table ipv4_table[] = {
 		.proc_handler	= proc_dointvec
 	},
 	{
-		.procname	= "tcp_mem",
-		.data		= &sysctl_tcp_mem,
-		.maxlen		= sizeof(sysctl_tcp_mem),
-		.mode		= 0644,
-		.proc_handler	= proc_doulongvec_minmax
-	},
-	{
 		.procname	= "tcp_wmem",
 		.data		= &sysctl_tcp_wmem,
 		.maxlen		= sizeof(sysctl_tcp_wmem),
@@ -721,6 +745,12 @@ static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= ipv4_ping_group_range,
 	},
+	{
+		.procname	= "tcp_mem",
+		.maxlen		= sizeof(init_net.ipv4.sysctl_tcp_mem),
+		.mode		= 0644,
+		.proc_handler	= ipv4_tcp_mem,
+	},
 	{ }
 };
 
@@ -734,6 +764,7 @@ EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
 static __net_init int ipv4_sysctl_init_net(struct net *net)
 {
 	struct ctl_table *table;
+	unsigned long limit;
 
 	table = ipv4_net_table;
 	if (!net_eq(net, &init_net)) {
@@ -769,6 +800,12 @@ static __net_init int ipv4_sysctl_init_net(struct net *net)
 
 	net->ipv4.sysctl_rt_cache_rebuild_count = 4;
 
+	limit = nr_free_buffer_pages() / 8;
+	limit = max(limit, 128UL);
+	net->ipv4.sysctl_tcp_mem[0] = limit / 4 * 3;
+	net->ipv4.sysctl_tcp_mem[1] = limit;
+	net->ipv4.sysctl_tcp_mem[2] = net->ipv4.sysctl_tcp_mem[0] * 2;
+
 	net->ipv4.ipv4_hdr = register_net_sysctl_table(net,
 			net_ipv4_ctl_path, table);
 	if (net->ipv4.ipv4_hdr == NULL)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 259f6d9..b1abebd 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -282,11 +282,9 @@ int sysctl_tcp_fin_timeout __read_mostly = TCP_FIN_TIMEOUT;
 struct percpu_counter tcp_orphan_count;
 EXPORT_SYMBOL_GPL(tcp_orphan_count);
 
-long sysctl_tcp_mem[3] __read_mostly;
 int sysctl_tcp_wmem[3] __read_mostly;
 int sysctl_tcp_rmem[3] __read_mostly;
 
-EXPORT_SYMBOL(sysctl_tcp_mem);
 EXPORT_SYMBOL(sysctl_tcp_rmem);
 EXPORT_SYMBOL(sysctl_tcp_wmem);
 
@@ -334,7 +332,7 @@ EXPORT_SYMBOL(tcp_enter_memory_pressure_nocg);
 
 long *tcp_sysctl_mem_nocg(const struct mem_cgroup *memcg)
 {
-	return sysctl_tcp_mem;
+	return init_net.ipv4.sysctl_tcp_mem;
 }
 EXPORT_SYMBOL(tcp_sysctl_mem_nocg);
 
@@ -3298,14 +3296,9 @@ void __init tcp_init(void)
 	sysctl_tcp_max_orphans = cnt / 2;
 	sysctl_max_syn_backlog = max(128, cnt / 256);
 
-	limit = nr_free_buffer_pages() / 8;
-	limit = max(limit, 128UL);
-	sysctl_tcp_mem[0] = limit / 4 * 3;
-	sysctl_tcp_mem[1] = limit;
-	sysctl_tcp_mem[2] = sysctl_tcp_mem[0] * 2;
-
 	/* Set per-socket limits to no more than 1/128 the pressure threshold */
-	limit = ((unsigned long)sysctl_tcp_mem[1]) << (PAGE_SHIFT - 7);
+	limit = ((unsigned long)init_net.ipv4.sysctl_tcp_mem[1])
+		<< (PAGE_SHIFT - 7);
 	max_share = min(4UL*1024*1024, limit);
 
 	sysctl_tcp_wmem[0] = SK_MEM_QUANTUM;
-- 
1.7.6.4

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