From fa55866e125d5cc59f0a8b17d00fa3e80e93a9a1 Mon Sep 17 00:00:00 2001
From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Tue, 8 Nov 2011 11:20:19 +1100
Subject: [PATCH] cgroups: new resource counter inheritance API

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(+)

diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index 1b3fe058fcb1..109d1183ebf2 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 0faafccbb80e..37abf4eda9ad 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -202,3 +202,21 @@ 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);
+	}
+}
-- 
2.39.2