# \[PATCH v2 7/7\] Display current tcp memory allocation in kmem cgroup - From: Glauber Costa \ - Date: 2011-09-15 01:49:06 - List: netdev - Page: https://ratatoskr.run/netdev/2011/09/3763748 - Thread: https://ratatoskr.run/netdev/2011/09/3763743/t.md ```text 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 CC: David S. Miller CC: Hiroyouki Kamezawa CC: Eric W. Biederman --- 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 ce825ee..59d9416 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 b48e517..dd0121f 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -482,12 +482,29 @@ 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org ```