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    Subject[PATCH 2/8] cgroups: new resource counter inheritance API
    Date
    Provide an API to inherit a counter value from a parent.  This can be
    useful to implement cgroup.clone_children on a resource counter.

    Still the resources of the children are limited by those of the parent, so
    this is only to provide a default setting behaviour when clone_children is
    set.

    Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Paul Menage <paul@paulmenage.org>
    Cc: Li Zefan <lizf@cn.fujitsu.com>
    Cc: Johannes Weiner <hannes@cmpxchg.org>
    Cc: Aditya Kali <adityakali@google.com>
    Cc: Oleg Nesterov <oleg@redhat.com>
    Cc: Kay Sievers <kay.sievers@vrfy.org>
    Cc: Tim Hockin <thockin@hockin.org>
    Cc: Tejun Heo <htejun@gmail.com>
    Acked-by: Kirill A. Shutemov <kirill@shutemov.name>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    ---
    include/linux/res_counter.h | 2 ++
    kernel/res_counter.c | 18 ++++++++++++++++++
    2 files changed, 20 insertions(+), 0 deletions(-)

    diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
    index 1b3fe05..109d118 100644
    --- a/include/linux/res_counter.h
    +++ b/include/linux/res_counter.h
    @@ -84,6 +84,8 @@ int res_counter_write(struct res_counter *counter, int member,

    void res_counter_write_u64(struct res_counter *counter, int member, u64 val);

    +void res_counter_inherit(struct res_counter *counter, int member);
    +
    /*
    * the field descriptors. one for each member of res_counter
    */
    diff --git a/kernel/res_counter.c b/kernel/res_counter.c
    index 58ae85e..016b4d4 100644
    --- a/kernel/res_counter.c
    +++ b/kernel/res_counter.c
    @@ -201,3 +201,21 @@ int res_counter_write(struct res_counter *counter, int member,

    return 0;
    }
    +
    +/*
    + * Simple inheritance implementation to get the same value
    + * than a parent. However this doesn't enforce the child value
    + * to be always below the one of the parent. But the child is
    + * subject to its parent limitation anyway.
    + */
    +void res_counter_inherit(struct res_counter *counter, int member)
    +{
    + struct res_counter *parent;
    + unsigned long long val;
    +
    + parent = counter->parent;
    + if (parent) {
    + val = res_counter_read_u64(parent, member);
    + res_counter_write_u64(counter, member, val);
    + }
    +}
    --
    1.7.5.4


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