[PATCH] sched: introduce child field in sched_domain

Introduce the child field in sched_domain struct and use it in
sched_balance_self().

We will also use this field in cleaning up the sched group cpu_power
setup(done in a different patch) code.

Signed-off-by: Suresh Siddha <[e-mail]>
Acked-by: Ingo Molnar <[e-mail]>
Acked-by: Nick Piggin <[e-mail]>
Cc: Paul Jackson <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

include/asm-i386/topology.h

···
 #define SD_NODE_INIT (struct sched_domain) {		\
 	.span			= CPU_MASK_NONE,	\
 	.parent			= NULL,			\
+	.child			= NULL,			\
 	.groups			= NULL,			\
 	.min_interval		= 8,			\
 	.max_interval		= 32,			\

include/asm-ia64/topology.h

···
 #define SD_CPU_INIT (struct sched_domain) {		\
 	.span			= CPU_MASK_NONE,	\
 	.parent			= NULL,			\
+	.child			= NULL,			\
 	.groups			= NULL,			\
 	.min_interval		= 1,			\
 	.max_interval		= 4,			\
···
 #define SD_NODE_INIT (struct sched_domain) {		\
 	.span			= CPU_MASK_NONE,	\
 	.parent			= NULL,			\
+	.child			= NULL,			\
 	.groups			= NULL,			\
 	.min_interval		= 8,			\
 	.max_interval		= 8*(min(num_online_cpus(), 32)), \

include/asm-mips/mach-ip27/topology.h

···
 #define SD_NODE_INIT (struct sched_domain) {		\
 	.span			= CPU_MASK_NONE,	\
 	.parent			= NULL,			\
+	.child			= NULL,			\
 	.groups			= NULL,			\
 	.min_interval		= 8,			\
 	.max_interval		= 32,			\

include/asm-powerpc/topology.h

···
 #define SD_NODE_INIT (struct sched_domain) {		\
 	.span			= CPU_MASK_NONE,	\
 	.parent			= NULL,			\
+	.child			= NULL,			\
 	.groups			= NULL,			\
 	.min_interval		= 8,			\
 	.max_interval		= 32,			\

include/asm-x86_64/topology.h

···
 #define SD_NODE_INIT (struct sched_domain) {		\
 	.span			= CPU_MASK_NONE,	\
 	.parent			= NULL,			\
+	.child			= NULL,			\
 	.groups			= NULL,			\
 	.min_interval		= 8,			\
 	.max_interval		= 32,			\

include/linux/sched.h

···
 struct sched_domain {
 	/* These fields must be setup */
 	struct sched_domain *parent;	/* top domain must be null terminated */
+	struct sched_domain *child;	/* bottom domain must be null terminated */
 	struct sched_group *groups;	/* the balancing groups of the domain */
 	cpumask_t span;			/* span of all CPUs in this domain */
 	unsigned long min_interval;	/* Minimum balance interval ms */

include/linux/topology.h

···
 #define SD_SIBLING_INIT (struct sched_domain) {		\
 	.span			= CPU_MASK_NONE,	\
 	.parent			= NULL,			\
+	.child			= NULL,			\
 	.groups			= NULL,			\
 	.min_interval		= 1,			\
 	.max_interval		= 2,			\
···
 #define SD_CPU_INIT (struct sched_domain) {		\
 	.span			= CPU_MASK_NONE,	\
 	.parent			= NULL,			\
+	.child			= NULL,			\
 	.groups			= NULL,			\
 	.min_interval		= 1,			\
 	.max_interval		= 4,			\
···
 #define SD_ALLNODES_INIT (struct sched_domain) {	\
 	.span			= CPU_MASK_NONE,	\
 	.parent			= NULL,			\
+	.child			= NULL,			\
 	.groups			= NULL,			\
 	.min_interval		= 64,			\
 	.max_interval		= 64*num_online_cpus(),	\

kernel/sched.c

···
 	while (sd) {
 		cpumask_t span;
 		struct sched_group *group;
-		int new_cpu;
-		int weight;
+		int new_cpu, weight;
+
+		if (!(sd->flags & flag)) {
+			sd = sd->child;
+			continue;
+		}
 
 		span = sd->span;
 		group = find_idlest_group(sd, t, cpu);
-		if (!group)
-			goto nextlevel;
+		if (!group) {
+			sd = sd->child;
+			continue;
+		}
 
 		new_cpu = find_idlest_cpu(group, t, cpu);
-		if (new_cpu == -1 || new_cpu == cpu)
-			goto nextlevel;
+		if (new_cpu == -1 || new_cpu == cpu) {
+			/* Now try balancing at a lower domain level of cpu */
+			sd = sd->child;
+			continue;
+		}
 
-		/* Now try balancing at a lower domain level */
+		/* Now try balancing at a lower domain level of new_cpu */
 		cpu = new_cpu;
-nextlevel:
 		sd = NULL;
 		weight = cpus_weight(span);
 		for_each_domain(cpu, tmp) {
···
 		struct sched_domain *parent = tmp->parent;
 		if (!parent)
 			break;
-		if (sd_parent_degenerate(tmp, parent))
+		if (sd_parent_degenerate(tmp, parent)) {
 			tmp->parent = parent->parent;
+			if (parent->parent)
+				parent->parent->child = tmp;
+		}
 	}
 
-	if (sd && sd_degenerate(sd))
+	if (sd && sd_degenerate(sd)) {
 		sd = sd->parent;
+		if (sd)
+			sd->child = NULL;
+	}
 
 	sched_domain_debug(sd, cpu);
 
···
 		*sd = SD_NODE_INIT;
 		sd->span = sched_domain_node_span(cpu_to_node(i));
 		sd->parent = p;
+		if (p)
+			p->child = sd;
 		cpus_and(sd->span, sd->span, *cpu_map);
 #endif
 
···
 		*sd = SD_CPU_INIT;
 		sd->span = nodemask;
 		sd->parent = p;
+		if (p)
+			p->child = sd;
 		sd->groups = &sched_group_phys[group];
 
 #ifdef CONFIG_SCHED_MC
···
 		sd->span = cpu_coregroup_map(i);
 		cpus_and(sd->span, sd->span, *cpu_map);
 		sd->parent = p;
+		p->child = sd;
 		sd->groups = &sched_group_core[group];
 #endif
 
···
 		sd->span = cpu_sibling_map[i];
 		cpus_and(sd->span, sd->span, *cpu_map);
 		sd->parent = p;
+		p->child = sd;
 		sd->groups = &sched_group_cpus[group];
 #endif
 	}