linux-kernel - [PATCH 3/5] cpusets: enable the dynamical domain flags

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Date:	Tue, 17 Jul 2012 17:04:05 +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 3/5] cpusets: enable the dynamical domain flags

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

We will record the domain flags for cpuset in update_domain_attr and
use it to replace the static domain flags in set_domain_attribute.

Signed-off-by: Michael Wang <wangyun@...ux.vnet.ibm.com>
---
 kernel/cpuset.c     |    7 +++++++
 kernel/sched/core.c |   10 +++++++++-
 2 files changed, 16 insertions(+), 1 deletions(-)

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 67ee111..def8080 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -476,8 +476,15 @@ static int cpusets_overlap(struct cpuset *a, struct cpuset *b)
 static void
 update_domain_attr(struct sched_domain_attr *dattr, struct cpuset *c)
 {
+	int i;
 	if (dattr->relax_domain_level < c->relax_domain_level)
 		dattr->relax_domain_level = c->relax_domain_level;
+	/* record all the domain flags if cpuset want to use them */
+	if (c->enable_ddf) {
+		dattr->enable_ddf = 1;
+		for (i = 0; i < MAX_DDF; i++)
+			dattr->ddf[i] = c->ddf[i];
+	}
 	return;
 }
 
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 3f9d368..7a1c886 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6461,7 +6461,15 @@ static void set_domain_attribute(struct sched_domain *sd,
 {
 	int request;
 
-	if (!attr || attr->relax_domain_level < 0) {
+	if (!attr)
+		return;
+
+	if (attr->enable_ddf) {
+		/* replace domain flags with ddf according to level */
+		sd->flags = attr->ddf[sd->level];
+	}
+
+	if (attr->relax_domain_level < 0) {
 		if (default_relax_domain_level < 0)
 			return;
 		else
-- 
1.7.4.1

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