sched: Dynamic sched_domain::level

Remove the SD_LV_ enum and use dynamic level assignments.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20110407122942.969433965@chello.nl
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/linux/sched.h

@@ -892,25 +892,6 @@ static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
 	return to_cpumask(sg->cpumask);
 }
 
-enum sched_domain_level {
-	SD_LV_NONE = 0,
-#ifdef CONFIG_SCHED_SMT
-	SD_LV_SIBLING,
-#endif
-#ifdef CONFIG_SCHED_MC
-	SD_LV_MC,
-#endif
-#ifdef CONFIG_SCHED_BOOK
-	SD_LV_BOOK,
-#endif
-	SD_LV_CPU,
-#ifdef CONFIG_NUMA
-	SD_LV_NODE,
-	SD_LV_ALLNODES,
-#endif
-	SD_LV_MAX
-};
-
 struct sched_domain_attr {
 	int relax_domain_level;
 };
@@ -919,6 +900,8 @@ struct sched_domain_attr {
 	.relax_domain_level = -1,			\
 }
 
+extern int sched_domain_level_max;
+
 struct sched_domain {
 	/* These fields must be setup */
 	struct sched_domain *parent;	/* top domain must be null terminated */
@@ -936,7 +919,7 @@ struct sched_domain {
 	unsigned int forkexec_idx;
 	unsigned int smt_gain;
 	int flags;			/* See SD_* */
-	enum sched_domain_level level;
+	int level;
 
 	/* Runtime fields. */
 	unsigned long last_balance;	/* init to jiffies. units in jiffies */

kernel/cpuset.c

@@ -1159,7 +1159,7 @@ int current_cpuset_is_being_rebound(void)
 static int update_relax_domain_level(struct cpuset *cs, s64 val)
 {
 #ifdef CONFIG_SMP
-	if (val < -1 || val >= SD_LV_MAX)
+	if (val < -1 || val >= sched_domain_level_max)
 		return -EINVAL;
 #endif
 

kernel/sched.c

@@ -6966,7 +6966,6 @@ sd_init_##type(struct sched_domain_topology_level *tl, int cpu) 	\
 {									\
 	struct sched_domain *sd = *per_cpu_ptr(tl->data.sd, cpu);	\
 	*sd = SD_##type##_INIT;						\
-	sd->level = SD_LV_##type;					\
 	SD_INIT_NAME(sd, type);						\
 	sd->private = &tl->data;					\
 	return sd;							\
@@ -6988,13 +6987,14 @@ SD_INIT_FUNC(CPU)
 #endif
 
 static int default_relax_domain_level = -1;
+int sched_domain_level_max;
 
 static int __init setup_relax_domain_level(char *str)
 {
 	unsigned long val;
 
 	val = simple_strtoul(str, NULL, 0);
-	if (val < SD_LV_MAX)
+	if (val < sched_domain_level_max)
 		default_relax_domain_level = val;
 
 	return 1;
@@ -7173,8 +7173,11 @@ struct sched_domain *build_sched_domain(struct sched_domain_topology_level *tl,
 
 	set_domain_attribute(sd, attr);
 	cpumask_and(sched_domain_span(sd), cpu_map, tl->mask(cpu));
-	if (child)
+	if (child) {
+		sd->level = child->level + 1;
+		sched_domain_level_max = max(sched_domain_level_max, sd->level);
 		child->parent = sd;
+	}
 	sd->child = child;
 
 	return sd;