sched: Move sched domain name out of CONFIG_SCHED_DEBUG

JIRA: https://issues.redhat.com/browse/RHEL-23495

commit 1c055a0
Author: Swapnil Sapkal <swapnil.sapkal@amd.com>
Date:   Fri Dec 20 06:32:22 2024 +0000

    sched: Move sched domain name out of CONFIG_SCHED_DEBUG

    /proc/schedstat file shows cpu and sched domain level scheduler
    statistics. It does not show domain name instead shows domain level.
    It will be very useful for tools like `perf sched stats`[1] to
    aggragate domain level stats if domain names are shown in /proc/schedstat.
    But sched domain name is guarded by CONFIG_SCHED_DEBUG. As per the
    discussion[2], move sched domain name out of CONFIG_SCHED_DEBUG.

    [1] https://lore.kernel.org/lkml/20241122084452.1064968-1-swapnil.sapkal@amd.com/
    [2] https://lore.kernel.org/lkml/fcefeb4d-3acb-462d-9c9b-3df8d927e522@amd.com/

    Suggested-by: "Gautham R. Shenoy" <gautham.shenoy@amd.com>
    Signed-off-by: Swapnil Sapkal <swapnil.sapkal@amd.com>
    Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
    Link: https://lore.kernel.org/r/20241220063224.17767-5-swapnil.sapkal@amd.com

Signed-off-by: Phil Auld <pauld@redhat.com>

Author: auldp

include/linux/sched/topology.h

@@ -140,9 +140,7 @@ struct sched_domain {
 	unsigned int ttwu_move_affine;
 	unsigned int ttwu_move_balance;
 #endif
-#ifdef CONFIG_SCHED_DEBUG
 	char *name;
-#endif
 	union {
 		void *private;		/* used during construction */
 		struct rcu_head rcu;	/* used during destruction */
@@ -202,18 +200,12 @@ struct sched_domain_topology_level {
 	int		    flags;
 	int		    numa_level;
 	struct sd_data      data;
-#ifdef CONFIG_SCHED_DEBUG
 	char                *name;
-#endif
 };
 
 extern void __init set_sched_topology(struct sched_domain_topology_level *tl);
 
-#ifdef CONFIG_SCHED_DEBUG
 # define SD_INIT_NAME(type)		.name = #type
-#else
-# define SD_INIT_NAME(type)
-#endif
 
 #else /* CONFIG_SMP */
 

kernel/sched/topology.c

@@ -1628,9 +1628,7 @@ sd_init(struct sched_domain_topology_level *tl,
 		.max_newidle_lb_cost	= 0,
 		.last_decay_max_lb_cost	= jiffies,
 		.child			= child,
-#ifdef CONFIG_SCHED_DEBUG
 		.name			= tl->name,
-#endif
 	};
 
 	sd_span = sched_domain_span(sd);
@@ -2331,10 +2329,8 @@ static struct sched_domain *build_sched_domain(struct sched_domain_topology_leve
 		if (!cpumask_subset(sched_domain_span(child),
 				    sched_domain_span(sd))) {
 			pr_err("BUG: arch topology borken\n");
-#ifdef CONFIG_SCHED_DEBUG
 			pr_err("     the %s domain not a subset of the %s domain\n",
 					child->name, sd->name);
-#endif
 			/* Fixup, ensure @sd has at least @child CPUs. */
 			cpumask_or(sched_domain_span(sd),
 				   sched_domain_span(sd),