linux-kernel - [RFC PATCH 2/7] sched/topology: Introduce nr_groups in sched

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Message-Id: <d4bb3b7f8911ef38e60138ec7b0a629062ae7c34.1690273854.git.yu.c.chen@intel.com>
Date:   Thu, 27 Jul 2023 22:34:36 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
        Tim Chen <tim.c.chen@...el.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        "Gautham R . Shenoy" <gautham.shenoy@....com>,
        Chen Yu <yu.chen.surf@...il.com>,
        Aaron Lu <aaron.lu@...el.com>, linux-kernel@...r.kernel.org,
        Chen Yu <yu.c.chen@...el.com>
Subject: [RFC PATCH 2/7] sched/topology: Introduce nr_groups in sched_domain to indicate the number of groups

Record the number of sched groups within each sched domain. Prepare for
newidle_balance() scan depth calculation introduced by ILB_UTIL.

Signed-off-by: Chen Yu <yu.c.chen@...el.com>
---
 include/linux/sched/topology.h |  1 +
 kernel/sched/topology.c        | 10 ++++++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/include/linux/sched/topology.h b/include/linux/sched/topology.h
index 67b573d5bf28..c07f2f00317a 100644
--- a/include/linux/sched/topology.h
+++ b/include/linux/sched/topology.h
@@ -152,6 +152,7 @@ struct sched_domain {
 	struct sched_domain_shared *shared;
 
 	unsigned int span_weight;
+	unsigned int nr_groups;
 	/*
 	 * Span of all CPUs in this domain.
 	 *
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 64212f514765..56dc564fc9a3 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -1023,7 +1023,7 @@ build_overlap_sched_groups(struct sched_domain *sd, int cpu)
 	struct cpumask *covered = sched_domains_tmpmask;
 	struct sd_data *sdd = sd->private;
 	struct sched_domain *sibling;
-	int i;
+	int i, nr_groups = 0;
 
 	cpumask_clear(covered);
 
@@ -1087,6 +1087,8 @@ build_overlap_sched_groups(struct sched_domain *sd, int cpu)
 		if (!sg)
 			goto fail;
 
+		nr_groups++;
+
 		sg_span = sched_group_span(sg);
 		cpumask_or(covered, covered, sg_span);
 
@@ -1100,6 +1102,7 @@ build_overlap_sched_groups(struct sched_domain *sd, int cpu)
 		last->next = first;
 	}
 	sd->groups = first;
+	sd->nr_groups = nr_groups;
 
 	return 0;
 
@@ -1233,7 +1236,7 @@ build_sched_groups(struct sched_domain *sd, int cpu)
 	struct sd_data *sdd = sd->private;
 	const struct cpumask *span = sched_domain_span(sd);
 	struct cpumask *covered;
-	int i;
+	int i, nr_groups = 0;
 
 	lockdep_assert_held(&sched_domains_mutex);
 	covered = sched_domains_tmpmask;
@@ -1248,6 +1251,8 @@ build_sched_groups(struct sched_domain *sd, int cpu)
 
 		sg = get_group(i, sdd);
 
+		nr_groups++;
+
 		cpumask_or(covered, covered, sched_group_span(sg));
 
 		if (!first)
@@ -1258,6 +1263,7 @@ build_sched_groups(struct sched_domain *sd, int cpu)
 	}
 	last->next = first;
 	sd->groups = first;
+	sd->nr_groups = nr_groups;
 
 	return 0;
 }
-- 
2.25.1