[PATCH v3 7/7] Display current tcp memory allocation in kmem cgroup
From: Glauber Costa <hidden>
Date: 2011-09-19 00:59:10
Also in:
lkml, netdev
Subsystem:
control group - memory resource controller (memcg), documentation, memory management, the rest · Maintainers:
Johannes Weiner, Michal Hocko, Roman Gushchin, Shakeel Butt, Jonathan Corbet, Andrew Morton, Linus Torvalds
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 <redacted> CC: David S. Miller <davem@davemloft.net> CC: Hiroyouki Kamezawa <redacted> CC: Eric W. Biederman <redacted> --- Documentation/cgroups/memory.txt | 1 + mm/memcontrol.c | 17 +++++++++++++++++ 2 files changed, 18 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 be5ab89..8c015b0 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c@@ -514,12 +514,29 @@ static u64 tcp_read_maxmem(struct cgroup *cgrp, struct cftype *cft) return ret; } +static u64 tcp_read_curmem(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 = atomic_long_read(&sg->tcp_memory_allocated); + + cgroup_unlock(); + return ret; +} + 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, + }, }; /*
--
1.7.6
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