[tip: sched/core] sched/numa: Allow runtime enabling/disabling of NUMA balance without SCHED_DEBUG

tip-bot2 for Mel Gorman
2021-04-16T15:54:33Z

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@suse.de>
AuthorDate: Wed, 24 Mar 2021 13:39:16
Committer: Peter Zijlstra <peterz@infradead.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@suse.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Valentin Schneider <valentin.schneider@arm.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,