linux-kernel - [RFC PATCH 08/16 v3] Write CPU topology info for Workload Consolidation fields in sched

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Date:	Fri, 30 May 2014 14:36:04 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	mingo@...hat.com, peterz@...radead.org, rafael.j.wysocki@...el.com,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:	arjan.van.de.ven@...el.com, len.brown@...el.com,
	alan.cox@...el.com, mark.gross@...el.com, pjt@...gle.com,
	bsegall@...gle.com, morten.rasmussen@....com,
	vincent.guittot@...aro.org, rajeev.d.muralidhar@...el.com,
	vishwesh.m.rudramuni@...el.com, nicole.chalhoub@...el.com,
	ajaya.durg@...el.com, harinarayanan.seshadri@...el.com,
	jacob.jun.pan@...ux.intel.com, fengguang.wu@...el.com,
	yuyang.du@...el.com
Subject: [RFC PATCH 08/16 v3] Write CPU topology info for Workload Consolidation fields in sched_domain

Write additional CPU topology info in sched_domain for our use in cpu_attach_domain()

Signed-off-by: Yuyang Du <yuyang.du@...el.com>
---
 kernel/sched/core.c |   27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 1cb7402..9df01d5 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5496,6 +5496,31 @@ static void update_top_cache_domain(int cpu)
 	rcu_assign_pointer(per_cpu(sd_asym, cpu), sd);
 }
 
+static void update_cpu_position_info(struct sched_domain *sd)
+{
+	while (sd) {
+		int i = 0, j = 0, first, min = INT_MAX;
+		struct sched_group *group;
+
+		group = sd->groups;
+		first = group_first_cpu(group);
+		do {
+			int k = group_first_cpu(group);
+			i += 1;
+			if (k < first)
+				j += 1;
+			if (k < min) {
+				sd->first_group = group;
+				min = k;
+			}
+		} while (group = group->next, group != sd->groups);
+
+		sd->total_groups = i;
+		sd->group_number = j;
+		sd = sd->parent;
+	}
+}
+
 /*
  * Attach the domain 'sd' to 'cpu' as its base domain. Callers must
  * hold the hotplug lock.
@@ -5544,6 +5569,8 @@ cpu_attach_domain(struct sched_domain *sd, struct root_domain *rd, int cpu)
 	destroy_sched_domains(tmp, cpu);
 
 	update_top_cache_domain(cpu);
+
+	update_cpu_position_info(sd);
 }
 
 /* cpus with isolated domains */
-- 
1.7.9.5

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