linux-kernel - [tip: sched/core] sched/numa: Initialise numa_migrate

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Date:   Mon, 13 Jun 2022 08:43:32 -0000
From:   "tip-bot2 for Mel Gorman" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Mel Gorman <mgorman@...hsingularity.net>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        K Prateek Nayak <kprateek.nayak@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/numa: Initialise numa_migrate_retry

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     70ce3ea9aa4ed901c8a90de667df5ef307766e71
Gitweb:        https://git.kernel.org/tip/70ce3ea9aa4ed901c8a90de667df5ef307766e71
Author:        Mel Gorman <mgorman@...hsingularity.net>
AuthorDate:    Fri, 20 May 2022 11:35:16 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 13 Jun 2022 10:29:59 +02:00

sched/numa: Initialise numa_migrate_retry

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
---
 kernel/sched/fair.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 77b2048..51836ef 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;