linux-kernel - [PATCH 1/4] sched,numa: override part of migrate_degrades

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Date:   Fri, 23 Jun 2017 12:55:27 -0400
From:   riel@...hat.com
To:     linux-kernel@...r.kernel.org
Cc:     jhladky@...hat.com, mingo@...nel.org, mgorman@...e.de,
        peterz@...radead.org
Subject: [PATCH 1/4] sched,numa: override part of migrate_degrades_locality when idle balancing

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

Several tests in the NAS benchmark seem to run a lot slower with
NUMA balancing enabled, than with NUMA balancing disabled. The
slower run time corresponds with increased idle time.

Overriding the final test of migrate_degrades_locality (but still
doing the other NUMA tests first) seems to improve performance
of those benchmarks.

Reported-by: Jirka Hladky <jhladky@...hat.com>
Signed-off-by: Rik van Riel <riel@...riel.com>
Signed-off-by: Rik van Riel <riel@...hat.com>
---
 kernel/sched/fair.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 2a0e71034e36..2180c8591e16 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6635,6 +6635,10 @@ static int migrate_degrades_locality(struct task_struct *p, struct lb_env *env)
 	if (dst_nid == p->numa_preferred_nid)
 		return 0;
 
+	/* Leaving a core idle is often worse than degrading locality. */
+	if (env->idle != CPU_NOT_IDLE)
+		return -1;
+
 	if (numa_group) {
 		src_faults = group_faults(p, src_nid);
 		dst_faults = group_faults(p, dst_nid);
-- 
2.9.4