Messages in this thread Patch in this message | | | From | Glauber Costa <> | Subject | [PATCH v3 7/7] Display current tcp memory allocation in kmem cgroup | Date | Sun, 18 Sep 2011 21:56:45 -0300 |
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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@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 + 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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