Messages in this thread Patch in this message | | | From | Frederic Weisbecker <> | Subject | [PATCH 06/11] cgroups: Add res counter common ancestor searching | Date | Tue, 13 Sep 2011 01:11:26 +0200 |
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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> Acked-by: 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: Andrew Morton <akpm@linux-foundation.org> Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Tim Hockin <thockin@hockin.org> Cc: Tejun Heo <tj@kernel.org> --- include/linux/res_counter.h | 3 +++ kernel/res_counter.c | 22 ++++++++++++++++++++++ 2 files changed, 25 insertions(+), 0 deletions(-)
diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h index de4ba29..558f39b 100644 --- a/include/linux/res_counter.h +++ b/include/linux/res_counter.h @@ -147,6 +147,9 @@ static inline void res_counter_uncharge(struct res_counter *counter, res_counter_uncharge_until(counter, NULL, 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 0cc9c7e..22f07cc 100644 --- a/kernel/res_counter.c +++ b/kernel/res_counter.c @@ -91,6 +91,28 @@ void res_counter_uncharge_until(struct res_counter *counter, local_irq_restore(flags); } +/* + * Walk through r1 and r2 parents and try to find the closest common one + * between both. If none is found, it returns NULL. + */ +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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