linux-kernel - [PATCH 4/5] cpusets: add fundamental functions for recording

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Date:	Tue, 17 Jul 2012 17:04:09 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	LKML <linux-kernel@...r.kernel.org>
CC:	mingo@...hat.com, Peter Zijlstra <peterz@...radead.org>,
	paul@...lmenage.org
Subject: [PATCH 4/5] cpusets: add fundamental functions for recording

From: Michael Wang <wangyun@...ux.vnet.ibm.com>

Add the fundamental functions which will help to record the status of
dynamical domain flags for cpuset.

Signed-off-by: Michael Wang <wangyun@...ux.vnet.ibm.com>
---
 kernel/cpuset.c |   31 +++++++++++++++++++++++++++++++
 1 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index def8080..066c61c 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1189,6 +1189,37 @@ static int update_relax_domain_level(struct cpuset *cs, s64 val)
 }
 
 /*
+ * update the ddf of cs according to level and rebuild domain
+ * if ddf enabled.
+ */
+static int update_ddf(int level, struct cpuset *cs, u64 val)
+{
+	if (!is_sched_load_balance(cs))
+		return -EINVAL;
+
+	cs->ddf[level] = val;
+	if (cs->enable_ddf)
+		async_rebuild_sched_domains();
+
+	return 0;
+}
+
+/* enable or disable ddf supporting and rebuild domain */
+static int enable_ddf(struct cpuset *cs, u64 val)
+{
+	if (!is_sched_load_balance(cs))
+		return -EINVAL;
+
+	if ((val != 0 && val != 1) || cs->enable_ddf == val)
+		return -EINVAL;
+
+	cs->enable_ddf = val;
+	async_rebuild_sched_domains();
+
+	return 0;
+}
+
+/*
  * cpuset_change_flag - make a task's spread flags the same as its cpuset's
  * @tsk: task to be updated
  * @scan: struct cgroup_scanner containing the cgroup of the task
-- 
1.7.4.1

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