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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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