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Date: Thu, 21 Sep 2006 14:39:24 -0700
From: "Siddha, Suresh B" <suresh.b.siddha@...el.com>
To: akpm@...l.org
Cc: mingo@...e.hu, nickpiggin@...oo.com.au, pj@....com,
linux-kernel@...r.kernel.org, suresh.b.siddha@...el.com
Subject: [patch 1/2] sched: introduce child field in sched_domain
Andrew,
Please drop sched-generic-sched_group-cpu-power-setup.patch in your
-mm tree and add these two split up patches instead.
First patch appended and second patch will follow this.
thanks,
suresh
---
From: "Siddha, Suresh B" <suresh.b.siddha@...el.com>
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 <suresh.b.siddha@...el.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Nick Piggin <nickpiggin@...oo.com.au>
Cc: Paul Jackson <pj@....com>
---
diff -pNru linux-2.6.18/include/asm-i386/topology.h linux-child/include/asm-i386/topology.h
--- linux-2.6.18/include/asm-i386/topology.h 2006-09-19 20:42:06.000000000 -0700
+++ linux-child/include/asm-i386/topology.h 2006-09-20 18:45:01.000000000 -0700
@@ -74,6 +74,7 @@ static inline int node_to_first_cpu(int
#define SD_NODE_INIT (struct sched_domain) { \
.span = CPU_MASK_NONE, \
.parent = NULL, \
+ .child = NULL, \
.groups = NULL, \
.min_interval = 8, \
.max_interval = 32, \
diff -pNru linux-2.6.18/include/asm-ia64/topology.h linux-child/include/asm-ia64/topology.h
--- linux-2.6.18/include/asm-ia64/topology.h 2006-09-19 20:42:06.000000000 -0700
+++ linux-child/include/asm-ia64/topology.h 2006-09-20 18:45:01.000000000 -0700
@@ -59,6 +59,7 @@ void build_cpu_to_node_map(void);
#define SD_CPU_INIT (struct sched_domain) { \
.span = CPU_MASK_NONE, \
.parent = NULL, \
+ .child = NULL, \
.groups = NULL, \
.min_interval = 1, \
.max_interval = 4, \
@@ -84,6 +85,7 @@ void build_cpu_to_node_map(void);
#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)), \
diff -pNru linux-2.6.18/include/asm-mips/mach-ip27/topology.h linux-child/include/asm-mips/mach-ip27/topology.h
--- linux-2.6.18/include/asm-mips/mach-ip27/topology.h 2006-09-19 20:42:06.000000000 -0700
+++ linux-child/include/asm-mips/mach-ip27/topology.h 2006-09-20 18:45:01.000000000 -0700
@@ -22,6 +22,7 @@ extern unsigned char __node_distances[MA
#define SD_NODE_INIT (struct sched_domain) { \
.span = CPU_MASK_NONE, \
.parent = NULL, \
+ .child = NULL, \
.groups = NULL, \
.min_interval = 8, \
.max_interval = 32, \
diff -pNru linux-2.6.18/include/asm-powerpc/topology.h linux-child/include/asm-powerpc/topology.h
--- linux-2.6.18/include/asm-powerpc/topology.h 2006-09-19 20:42:06.000000000 -0700
+++ linux-child/include/asm-powerpc/topology.h 2006-09-20 18:45:01.000000000 -0700
@@ -43,6 +43,7 @@ extern int pcibus_to_node(struct pci_bus
#define SD_NODE_INIT (struct sched_domain) { \
.span = CPU_MASK_NONE, \
.parent = NULL, \
+ .child = NULL, \
.groups = NULL, \
.min_interval = 8, \
.max_interval = 32, \
diff -pNru linux-2.6.18/include/asm-x86_64/topology.h linux-child/include/asm-x86_64/topology.h
--- linux-2.6.18/include/asm-x86_64/topology.h 2006-09-19 20:42:06.000000000 -0700
+++ linux-child/include/asm-x86_64/topology.h 2006-09-20 18:45:01.000000000 -0700
@@ -31,6 +31,7 @@ extern int __node_distance(int, int);
#define SD_NODE_INIT (struct sched_domain) { \
.span = CPU_MASK_NONE, \
.parent = NULL, \
+ .child = NULL, \
.groups = NULL, \
.min_interval = 8, \
.max_interval = 32, \
diff -pNru linux-2.6.18/include/linux/sched.h linux-child/include/linux/sched.h
--- linux-2.6.18/include/linux/sched.h 2006-09-19 20:42:06.000000000 -0700
+++ linux-child/include/linux/sched.h 2006-09-20 18:45:01.000000000 -0700
@@ -642,6 +642,7 @@ struct sched_group {
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 */
diff -pNru linux-2.6.18/include/linux/topology.h linux-child/include/linux/topology.h
--- linux-2.6.18/include/linux/topology.h 2006-09-19 20:42:06.000000000 -0700
+++ linux-child/include/linux/topology.h 2006-09-20 18:45:51.000000000 -0700
@@ -89,6 +89,7 @@
#define SD_SIBLING_INIT (struct sched_domain) { \
.span = CPU_MASK_NONE, \
.parent = NULL, \
+ .child = NULL, \
.groups = NULL, \
.min_interval = 1, \
.max_interval = 2, \
@@ -119,6 +120,7 @@
#define SD_CPU_INIT (struct sched_domain) { \
.span = CPU_MASK_NONE, \
.parent = NULL, \
+ .child = NULL, \
.groups = NULL, \
.min_interval = 1, \
.max_interval = 4, \
@@ -146,6 +148,7 @@
#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(), \
diff -pNru linux-2.6.18/kernel/sched.c linux-child/kernel/sched.c
--- linux-2.6.18/kernel/sched.c 2006-09-19 20:42:06.000000000 -0700
+++ linux-child/kernel/sched.c 2006-09-20 18:45:01.000000000 -0700
@@ -1276,21 +1276,29 @@ static int sched_balance_self(int cpu, i
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) {
@@ -5404,12 +5412,18 @@ static void cpu_attach_domain(struct sch
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);
@@ -6248,6 +6262,8 @@ static int build_sched_domains(const 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
@@ -6269,6 +6285,8 @@ static int build_sched_domains(const cpu
*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
@@ -6291,6 +6309,7 @@ static int build_sched_domains(const cpu
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
@@ -6302,6 +6321,7 @@ static int build_sched_domains(const cpu
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
}
-
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