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

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 62fbd09..8042098 100644 (file)
--- 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,