netdev - [PATCH v4 7/8] Display current tcp memory allocation in kmem cgroup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1317637123-18306-8-git-send-email-glommer@parallels.com>
Date:	Mon,  3 Oct 2011 14:18:42 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	linux-kernel@...r.kernel.org
Cc:	paul@...lmenage.org, lizf@...fujitsu.com,
	kamezawa.hiroyu@...fujitsu.com, ebiederm@...ssion.com,
	davem@...emloft.net, gthelen@...gle.com, netdev@...r.kernel.org,
	linux-mm@...ck.org, kirill@...temov.name, avagin@...allels.com,
	Glauber Costa <glommer@...allels.com>
Subject: [PATCH v4 7/8] Display current tcp memory allocation in kmem cgroup

This patch introduces kmem.tcp_current_memory 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@...allels.com>
CC: David S. Miller <davem@...emloft.net>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@...fujitsu.com>
CC: Eric W. Biederman <ebiederm@...ssion.com>
---
 Documentation/cgroups/memory.txt |    1 +
 mm/memcontrol.c                  |   11 +++++++++++
 2 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index 1ffde3e..f5a539d 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.max_memory      # set/show hard limit for tcp buf memory
+ memory.kmem.tcp.current_memory  # show current tcp buf memory allocation
 
 1. History
 
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 38b66e9..3b38d0a 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -496,12 +496,23 @@ static u64 tcp_read_maxmem(struct cgroup *cgrp, struct cftype *cft)
 	return memcg->tcp.tcp_max_memory;
 }
 
+static u64 tcp_read_curmem(struct cgroup *cgrp, struct cftype *cft)
+{
+	struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+
+	return atomic_long_read(&memcg->tcp.tcp_memory_allocated);
+}
+
 static struct cftype tcp_files[] = {
 	{
 		.name = "kmem.tcp.max_memory",
 		.write_u64 = tcp_write_maxmem,
 		.read_u64 = tcp_read_maxmem,
 	},
+	{
+		.name = "kmem.tcp.current_memory",
+		.read_u64 = tcp_read_curmem,
+	},
 };
 
 static void tcp_create_cgroup(struct mem_cgroup *cg, struct cgroup_subsys *ss)
-- 
1.7.6

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html