linux-kernel - [PATCH 5.19 0291/1157] sched/numa: Initialise numa_migrate

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Message-Id: <20220815180451.263889074@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 19:54:07 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mel Gorman <mgorman@...hsingularity.net>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 0291/1157] sched/numa: Initialise numa_migrate_retry

From: Mel Gorman <mgorman@...hsingularity.net>

[ Upstream commit 70ce3ea9aa4ed901c8a90de667df5ef307766e71 ]

On clone, numa_migrate_retry is inherited from the parent which means
that the first NUMA placement of a task is non-deterministic. This
affects when load balancing recognises numa tasks and whether to
migrate "regular", "remote" or "all" tasks between NUMA scheduler
domains.

Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Tested-by: K Prateek Nayak <kprateek.nayak@....com>
Link: https://lore.kernel.org/r/20220520103519.1863-2-mgorman@techsingularity.net
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/sched/fair.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 9d6058b0a3d4..0cba1b2e295b 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2885,6 +2885,7 @@ void init_numa_balancing(unsigned long clone_flags, struct task_struct *p)
 	p->node_stamp			= 0;
 	p->numa_scan_seq		= mm ? mm->numa_scan_seq : 0;
 	p->numa_scan_period		= sysctl_numa_balancing_scan_delay;
+	p->numa_migrate_retry		= 0;
 	/* Protect against double add, see task_tick_numa and task_numa_work */
 	p->numa_work.next		= &p->numa_work;
 	p->numa_faults			= NULL;
-- 
2.35.1