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Message-Id: <1311956010-32076-3-git-send-email-fweisbec@gmail.com>
Date: Fri, 29 Jul 2011 18:13:24 +0200
From: Frederic Weisbecker <fweisbec@...il.com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Paul Menage <menage@...gle.com>,
Li Zefan <lizf@...fujitsu.com>,
Johannes Weiner <hannes@...xchg.org>,
Aditya Kali <adityakali@...gle.com>,
Oleg Nesterov <oleg@...hat.com>
Subject: [PATCH 2/8] 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@...il.com>
Cc: Paul Menage <menage@...gle.com>
Cc: Li Zefan <lizf@...fujitsu.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Aditya Kali <adityakali@...gle.com>
Cc: Oleg Nesterov <oleg@...hat.com>
---
include/linux/res_counter.h | 2 ++
kernel/res_counter.c | 12 ++++++++++++
2 files changed, 14 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 806d041..10a901b 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -198,3 +198,15 @@ int res_counter_write(struct res_counter *counter, int member,
return 0;
}
+
+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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