linux-kernel - [PATCH 1/6] sched,numa: export info needed for NUMA balancing on complex topologies

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Date:	Fri, 17 Oct 2014 03:29:49 -0400
From:	riel@...hat.com
To:	linux-kernel@...r.kernel.org
Cc:	chegu_vinod@...com, peterz@...radead.org, mingo@...hat.com,
	mgorman@...e.de
Subject: [PATCH 1/6] sched,numa: export info needed for NUMA balancing on complex topologies

From: Rik van Riel <riel@...hat.com>

Export some information that is necessary to do placement of
tasks on systems with multi-level NUMA topologies.

Signed-off-by: Rik van Riel <riel@...hat.com>
---
 kernel/sched/core.c  | 4 +++-
 kernel/sched/sched.h | 2 ++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 5a4ad05..ed427f9 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6076,6 +6076,7 @@ static void claim_allocations(int cpu, struct sched_domain *sd)
 #ifdef CONFIG_NUMA
 static int sched_domains_numa_levels;
 static int *sched_domains_numa_distance;
+int sched_max_numa_distance;
 static struct cpumask ***sched_domains_numa_masks;
 static int sched_domains_curr_level;
 #endif
@@ -6247,7 +6248,7 @@ static void sched_numa_warn(const char *str)
 	printk(KERN_WARNING "\n");
 }
 
-static bool find_numa_distance(int distance)
+bool find_numa_distance(int distance)
 {
 	int i;
 
@@ -6394,6 +6395,7 @@ static void sched_init_numa(void)
 	sched_domain_topology = tl;
 
 	sched_domains_numa_levels = level;
+	sched_max_numa_distance = sched_domains_numa_distance[level - 1];
 }
 
 static void sched_domains_numa_masks_set(int cpu)
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 6130251..515402e 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -680,6 +680,8 @@ static inline u64 rq_clock_task(struct rq *rq)
 
 #ifdef CONFIG_NUMA_BALANCING
 extern void sched_setnuma(struct task_struct *p, int node);
+extern int sched_max_numa_distance;
+extern bool find_numa_distance(int distance);
 extern int migrate_task_to(struct task_struct *p, int cpu);
 extern int migrate_swap(struct task_struct *, struct task_struct *);
 #endif /* CONFIG_NUMA_BALANCING */
-- 
1.9.3

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