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[PATCH v8 7/9] Display current tcp memory allocation in kmem cgroup [message #44394 is a reply to message #44388]

Mon, 05 December 2011 21:35

Glauber Costa
Messages: 916
Registered: October 2011

Senior Member

This patch introduces kmem.tcp.usage_in_bytes file, living in the
kmem_cgroup filesystem. It is a simple read-only file that displays the
amount of kernel memory currently consumed by the cgroup.

Signed-off-by: Glauber Costa <glommer@parallels.com>
Reviewed-by: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: David S. Miller <davem@davemloft.net>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
Documentation/cgroups/memory.txt | 1 +
net/ipv4/tcp_memcontrol.c | 21 +++++++++++++++++++++
2 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index 1c9779a..6922b6c 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -79,6 +79,7 @@ Brief summary of control files.
memory.independent_kmem_limit # select whether or not kernel memory limits are
independent of user limits
memory.kmem.tcp.limit_in_bytes # set/show hard limit for tcp buf memory
+ memory.kmem.tcp.usage_in_bytes # show current tcp buf memory allocation

1. History

diff --git a/net/ipv4/tcp_memcontrol.c b/net/ipv4/tcp_memcontrol.c
index e353390..9481f23 100644
--- a/net/ipv4/tcp_memcontrol.c
+++ b/net/ipv4/tcp_memcontrol.c
@@ -17,6 +17,11 @@ static struct cftype tcp_files[] = {
.read_u64 = tcp_cgroup_read,
.private = RES_LIMIT,
},
+ {
+ .name = "kmem.tcp.usage_in_bytes",
+ .read_u64 = tcp_cgroup_read,
+ .private = RES_USAGE,
+ },
};

static inline struct tcp_memcontrol *tcp_from_cgproto(struct cg_proto *cg_proto)
@@ -167,6 +172,19 @@ static u64 tcp_read_stat(struct mem_cgroup *memcg, int type, u64 default_val)
return res_counter_read_u64(&tcp->tcp_memory_allocated, type);
}

+static u64 tcp_read_usage(struct mem_cgroup *memcg)
+{
+ struct tcp_memcontrol *tcp;
+ struct cg_proto *cg_proto;
+
+ cg_proto = tcp_prot.proto_cgroup(memcg);
+ if (!cg_proto)
+ return atomic_long_read(&tcp_memory_allocated) << PAGE_SHIFT;
+
+ tcp = tcp_from_cgproto(cg_proto);
+ return res_counter_read_u64(&tcp->tcp_memory_allocated, RES_USAGE);
+}
+
static u64 tcp_cgroup_read(struct cgroup *cont, struct cftype *cft)
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
@@ -176,6 +194,9 @@ static u64 tcp_cgroup_read(struct cgroup *cont, struct cftype *cft)
case RES_LIMIT:
val = tcp_read_stat(memcg, RES_LIMIT, RESOURCE_MAX);
break;
+ case RES_USAGE:
+ val = tcp_read_usage(memcg);
+ break;
default:
BUG();
}
--
1.7.6.4

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[Message index]

		[PATCH v8 0/9] per-cgroup tcp memory pressure controls By: Glauber Costa on Mon, 05 December 2011 21:34
		[PATCH v8 2/9] foundations of per-cgroup memory pressure controlling. By: Glauber Costa on Mon, 05 December 2011 21:34
		Re: [PATCH v8 2/9] foundations of per-cgroup memory pressure controlling. By: KAMEZAWA Hiroyuki on Fri, 09 December 2011 01:24
		Re: [PATCH v8 2/9] foundations of per-cgroup memory pressure controlling. By: Glauber Costa on Fri, 09 December 2011 12:41
		[PATCH v8 1/9] Basic kernel memory functionality for the Memory Controller By: Glauber Costa on Mon, 05 December 2011 21:34
		Re: [PATCH v8 1/9] Basic kernel memory functionality for the Memory Controller By: KAMEZAWA Hiroyuki on Fri, 09 December 2011 01:21
		Re: [PATCH v8 1/9] Basic kernel memory functionality for the Memory Controller By: Glauber Costa on Fri, 09 December 2011 12:40
		Re: [PATCH v8 1/9] Basic kernel memory functionality for the Memory Controller By: Glauber Costa on Fri, 09 December 2011 14:37
		Re: [PATCH v8 1/9] Basic kernel memory functionality for the Memory Controller By: KAMEZAWA Hiroyuki on Mon, 12 December 2011 00:34
		RE: [PATCH v8 1/9] Basic kernel memory functionality for the Memory Controller By: David Laight on Fri, 09 December 2011 14:44
		Re: [PATCH v8 1/9] Basic kernel memory functionality for the Memory Controller By: Glauber Costa on Fri, 09 December 2011 14:48
		[PATCH v8 3/9] socket: initial cgroup code. By: Glauber Costa on Mon, 05 December 2011 21:34
		Re: [PATCH v8 3/9] socket: initial cgroup code. By: KAMEZAWA Hiroyuki on Fri, 09 December 2011 01:49
		Re: [PATCH v8 3/9] socket: initial cgroup code. By: KAMEZAWA Hiroyuki on Fri, 09 December 2011 02:05
		Re: [PATCH v8 3/9] socket: initial cgroup code. By: Glauber Costa on Fri, 09 December 2011 12:43
		Re: [PATCH v8 3/9] socket: initial cgroup code. By: KAMEZAWA Hiroyuki on Mon, 12 December 2011 00:33
		[PATCH v8 5/9] per-netns ipv4 sysctl_tcp_mem By: Glauber Costa on Mon, 05 December 2011 21:34
		Re: [PATCH v8 5/9] per-netns ipv4 sysctl_tcp_mem By: KAMEZAWA Hiroyuki on Fri, 09 December 2011 01:54
		[PATCH v8 6/9] tcp buffer limitation: per-cgroup limit By: Glauber Costa on Mon, 05 December 2011 21:35
		Re: [PATCH v8 6/9] tcp buffer limitation: per-cgroup limit By: KAMEZAWA Hiroyuki on Fri, 09 December 2011 01:55
		[PATCH v8 7/9] Display current tcp memory allocation in kmem cgroup By: Glauber Costa on Mon, 05 December 2011 21:35
		Re: [PATCH v8 7/9] Display current tcp memory allocation in kmem cgroup By: KAMEZAWA Hiroyuki on Fri, 09 December 2011 01:56
		[PATCH v8 8/9] Display current tcp failcnt in kmem cgroup By: Glauber Costa on Mon, 05 December 2011 21:35
		[PATCH v8 9/9] Display maximum tcp memory allocation in kmem cgroup By: Glauber Costa on Mon, 05 December 2011 21:35
		Re: [PATCH v8 9/9] Display maximum tcp memory allocation in kmem cgroup By: KAMEZAWA Hiroyuki on Fri, 09 December 2011 01:57
		[PATCH v8 4/9] tcp memory pressure controls By: Glauber Costa on Mon, 05 December 2011 21:34
		Re: [PATCH v8 4/9] tcp memory pressure controls By: KAMEZAWA Hiroyuki on Fri, 09 December 2011 01:51
		Re: [PATCH v8 0/9] per-cgroup tcp memory pressure controls By: Glauber Costa on Wed, 07 December 2011 11:06
		Re: [PATCH v8 0/9] per-cgroup tcp memory pressure controls By: KAMEZAWA Hiroyuki on Fri, 09 December 2011 01:04

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