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    Subject[PATCH v2 8/9] Display current tcp memory allocation in kmem cgroup
    Date
    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>
    ---
    net/ipv4/tcp.c | 17 +++++++++++++++++
    1 files changed, 17 insertions(+), 0 deletions(-)

    diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
    index e1918fa..ff5c0e0 100644
    --- a/net/ipv4/tcp.c
    +++ b/net/ipv4/tcp.c
    @@ -365,12 +365,29 @@ 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 kmem_cgroup *sg = kcg_from_cgroup(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 = "tcp_maxmem",
    .write_u64 = tcp_write_maxmem,
    .read_u64 = tcp_read_maxmem,
    },
    + {
    + .name = "tcp_current_memory",
    + .read_u64 = tcp_read_curmem,
    + },
    };

    int tcp_init_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss)
    --
    1.7.6


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