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>

diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index 1b3fe058fcb15b8cf21629ca2d5de3b31a3a469c..109d1183ebf29bba4b90e49ce302a59a601894ab 100644 (file)
--- 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 0faafccbb80ec60d0d46785965ffcc2d98b0edd2..37abf4eda9adf5f31908cad494a3197d5554e219 100644 (file)
--- 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);
+       }
+}