linux-kernel - [tip: sched/core] sched/numa: Allow runtime enabling/disabling of NUMA balance without SCHED

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Message-ID: <161858842405.29796.3492604972677273238.tip-bot2@tip-bot2>
Date:   Fri, 16 Apr 2021 15:53:44 -0000
From:   "tip-bot2 for Mel Gorman" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Mel Gorman <mgorman@...e.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Valentin Schneider <valentin.schneider@....com>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/numa: Allow runtime enabling/disabling of
 NUMA balance without SCHED_DEBUG

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

Commit-ID:     b7cc6ec744b307db59568c654a8904a5928aa855
Gitweb:        https://git.kernel.org/tip/b7cc6ec744b307db59568c654a8904a5928aa855
Author:        Mel Gorman <mgorman@...e.de>
AuthorDate:    Wed, 24 Mar 2021 13:39:16 
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 16 Apr 2021 17:06:33 +02:00

sched/numa: Allow runtime enabling/disabling of NUMA balance without SCHED_DEBUG

The ability to enable/disable NUMA balancing is not a debugging feature
and should not depend on CONFIG_SCHED_DEBUG.  For example, machines within
a HPC cluster may disable NUMA balancing temporarily for some jobs and
re-enable it for other jobs without needing to reboot.

This patch removes the dependency on CONFIG_SCHED_DEBUG for
kernel.numa_balancing sysctl. The other numa balancing related sysctls
are left as-is because if they need to be tuned then it is more likely
that NUMA balancing needs to be fixed instead.

Signed-off-by: Mel Gorman <mgorman@...e.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Tested-by: Valentin Schneider <valentin.schneider@....com>
Link: https://lkml.kernel.org/r/20210324133916.GQ15768@suse.de
---
 kernel/sysctl.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 62fbd09..8042098 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1753,6 +1753,9 @@ static struct ctl_table kern_table[] = {
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= SYSCTL_ONE,
 	},
+#endif /* CONFIG_NUMA_BALANCING */
+#endif /* CONFIG_SCHED_DEBUG */
+#ifdef CONFIG_NUMA_BALANCING
 	{
 		.procname	= "numa_balancing",
 		.data		= NULL, /* filled in by handler */
@@ -1763,7 +1766,6 @@ static struct ctl_table kern_table[] = {
 		.extra2		= SYSCTL_ONE,
 	},
 #endif /* CONFIG_NUMA_BALANCING */
-#endif /* CONFIG_SCHED_DEBUG */
 	{
 		.procname	= "sched_rt_period_us",
 		.data		= &sysctl_sched_rt_period,