@@ -78,6 +78,7 @@ Brief summary of control files.
memory.independent_kmem_limit # select whether or not kernel memory limits are
independent of user limits
+ memory.kmem.tcp.max_memory # set/show hard limit for tcp buf memory
1. History
@@ -439,6 +439,10 @@ static inline void sock_release_memcg(struct sock *sk)
{
cgroup_release_and_wakeup_rmdir(mem_cgroup_css(sk->sk_cgrp));
}
+
+unsigned long tcp_max_memory(struct mem_cgroup *cg);
+void tcp_prot_mem(struct mem_cgroup *cg, long val, int idx);
+
#else
/* memcontrol includes sockets.h, that includes memcontrol.h ... */
static inline void memcg_sock_mem_alloc(struct mem_cgroup *mem,
@@ -466,6 +470,13 @@ static inline void sock_update_memcg(struct sock *sk)
static inline void sock_release_memcg(struct sock *sk)
{
}
+static inline unsigned long tcp_max_memory(struct mem_cgroup *cg)
+{
+ return 0;
+}
+static inline void tcp_prot_mem(struct mem_cgroup *cg, long val, int idx)
+{
+}
#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
#endif /* CONFIG_INET */
#endif /* _LINUX_MEMCONTROL_H */
@@ -345,6 +345,7 @@ struct mem_cgroup {
spinlock_t pcp_counter_lock;
/* per-cgroup tcp memory pressure knobs */
+ int tcp_max_memory;
atomic_long_t tcp_memory_allocated;
struct percpu_counter tcp_sockets_allocated;
/* those two are read-mostly, leave them at the end */
@@ -439,6 +440,56 @@ struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *sg)
return &sg->tcp_sockets_allocated;
}
+static int tcp_write_maxmem(struct cgroup *cgrp, struct cftype *cft, u64 val)
+{
+ struct mem_cgroup *sg = mem_cgroup_from_cont(cgrp);
+ struct mem_cgroup *parent = parent_mem_cgroup(sg);
+ struct net *net = current->nsproxy->net_ns;
+ int i;
+
+ if (!cgroup_lock_live_group(cgrp))
+ return -ENODEV;
+
+ /*
+ * We can't allow more memory than our parents. Since this
+ * will be tested for all calls, by induction, there is no need
+ * to test any parent other than our own
+ * */
+ if (parent && (val > parent->tcp_max_memory))
+ val = parent->tcp_max_memory;
+
+ sg->tcp_max_memory = val;
+
+ for (i = 0; i < 3; i++)
+ sg->tcp_prot_mem[i] = min_t(long, val,
+ net->ipv4.sysctl_tcp_mem[i]);
+
+ cgroup_unlock();
+
+ return 0;
+}
+
+static u64 tcp_read_maxmem(struct cgroup *cgrp, struct cftype *cft)
+{
+ struct mem_cgroup *sg = mem_cgroup_from_cont(cgrp);
+ u64 ret;
+
+ if (!cgroup_lock_live_group(cgrp))
+ return -ENODEV;
+ ret = sg->tcp_max_memory;
+
+ cgroup_unlock();
+ return ret;
+}
+
+static struct cftype tcp_files[] = {
+ {
+ .name = "kmem.tcp.max_memory",
+ .write_u64 = tcp_write_maxmem,
+ .read_u64 = tcp_read_maxmem,
+ },
+};
+
/*
* For ipv6, we only need to fill in the function pointers (can't initialize
* things twice). So keep it separated
@@ -471,6 +522,7 @@ int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
struct cgroup_subsys *ss)
{
struct mem_cgroup *cg = mem_cgroup_from_cont(cgrp);
+ struct mem_cgroup *parent = parent_mem_cgroup(cg);
unsigned long limit;
struct net *net = current->nsproxy->net_ns;
@@ -481,12 +533,17 @@ int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
limit = nr_free_buffer_pages() / 8;
limit = max(limit, 128UL);
+ if (parent)
+ cg->tcp_max_memory = parent->tcp_max_memory;
+ else
+ cg->tcp_max_memory = limit * 2;
+
cg->tcp_prot_mem[0] = net->ipv4.sysctl_tcp_mem[0];
cg->tcp_prot_mem[1] = net->ipv4.sysctl_tcp_mem[1];
cg->tcp_prot_mem[2] = net->ipv4.sysctl_tcp_mem[2];
tcp_init_cgroup_fill(prot, cgrp, ss);
- return 0;
+ return cgroup_add_files(cgrp, ss, tcp_files, ARRAY_SIZE(tcp_files));
}
EXPORT_SYMBOL(tcp_init_cgroup);
@@ -499,6 +556,16 @@ void tcp_destroy_cgroup(struct proto *prot, struct cgroup *cgrp,
tcp_destroy_cgroup_fill(prot, cgrp, ss);
}
EXPORT_SYMBOL(tcp_destroy_cgroup);
+
+unsigned long tcp_max_memory(struct mem_cgroup *cg)
+{
+ return cg->tcp_max_memory;
+}
+
+void tcp_prot_mem(struct mem_cgroup *cg, long val, int idx)
+{
+ cg->tcp_prot_mem[idx] = val;
+}
#endif /* CONFIG_INET */
#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
@@ -14,6 +14,7 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/nsproxy.h>
+#include <linux/memcontrol.h>
#include <linux/swap.h>
#include <net/snmp.h>
#include <net/icmp.h>
@@ -182,6 +183,10 @@ static int ipv4_tcp_mem(ctl_table *ctl, int write,
int ret;
unsigned long vec[3];
struct net *net = current->nsproxy->net_ns;
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+ int i;
+ struct mem_cgroup *cg;
+#endif
ctl_table tmp = {
.data = &vec,
@@ -198,6 +203,21 @@ static int ipv4_tcp_mem(ctl_table *ctl, int write,
if (ret)
return ret;
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+ rcu_read_lock();
+ cg = mem_cgroup_from_task(current);
+ for (i = 0; i < 3; i++)
+ if (vec[i] > tcp_max_memory(cg)) {
+ rcu_read_unlock();
+ return -EINVAL;
+ }
+
+ tcp_prot_mem(cg, vec[0], 0);
+ tcp_prot_mem(cg, vec[1], 1);
+ tcp_prot_mem(cg, vec[2], 2);
+ rcu_read_unlock();
+#endif
+
net->ipv4.sysctl_tcp_mem[0] = vec[0];
net->ipv4.sysctl_tcp_mem[1] = vec[1];
net->ipv4.sysctl_tcp_mem[2] = vec[2];
This patch uses the "tcp_max_mem" field of the kmem_cgroup to effectively control the amount of kernel memory pinned by a cgroup. We have to make sure that none of the memory pressure thresholds specified in the namespace are bigger than the current cgroup. Signed-off-by: Glauber Costa <glommer@parallels.com> CC: David S. Miller <davem@davemloft.net> CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com> CC: Eric W. Biederman <ebiederm@xmission.com> --- Documentation/cgroups/memory.txt | 1 + include/linux/memcontrol.h | 11 ++++++ mm/memcontrol.c | 69 +++++++++++++++++++++++++++++++++++++- net/ipv4/sysctl_net_ipv4.c | 20 +++++++++++ 4 files changed, 100 insertions(+), 1 deletions(-)