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    Subject[PATCH 6/7] cgroups: Add res counter common ancestor searching
    Date
    Add a new API to find the common ancestor between two resource
    counters. This includes the passed resource counter themselves.

    Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Paul Menage <menage@google.com>
    Cc: Li Zefan <lizf@cn.fujitsu.com>
    Cc: Johannes Weiner <hannes@cmpxchg.org>
    Cc: Aditya Kali <adityakali@google.com>
    ---
    include/linux/res_counter.h | 2 ++
    kernel/res_counter.c | 19 +++++++++++++++++++
    2 files changed, 21 insertions(+), 0 deletions(-)

    diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
    index 8c421ac..354ed30 100644
    --- a/include/linux/res_counter.h
    +++ b/include/linux/res_counter.h
    @@ -139,6 +139,8 @@ void res_counter_uncharge_until(struct res_counter *counter, struct res_counter
    unsigned long val);
    void res_counter_uncharge(struct res_counter *counter, unsigned long val);

    +struct res_counter *res_counter_common_ancestor(struct res_counter *l, struct res_counter *r);
    +
    /**
    * res_counter_margin - calculate chargeable space of a counter
    * @cnt: the counter
    diff --git a/kernel/res_counter.c b/kernel/res_counter.c
    index 39f2513..1b2efd6 100644
    --- a/kernel/res_counter.c
    +++ b/kernel/res_counter.c
    @@ -102,6 +102,25 @@ void res_counter_uncharge(struct res_counter *counter, unsigned long val)
    res_counter_uncharge_until(counter, NULL, val);
    }

    +struct res_counter *
    +res_counter_common_ancestor(struct res_counter *r1, struct res_counter *r2)
    +{
    + struct res_counter *iter;
    +
    + while (r1) {
    + iter = r2;
    + while (iter) {
    + if (iter == r1)
    + return iter;
    + iter = iter->parent;
    + }
    +
    + r1 = r1->parent;
    + }
    +
    + return NULL;
    +}
    +
    static inline unsigned long long *
    res_counter_member(struct res_counter *counter, int member)
    {
    --
    1.7.5.4


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