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Subject[PATCH/RFC 3/5] [PATCH] sched: add book scheduling domain
From: Heiko Carstens <heiko.carstens@de.ibm.com>

On top of the SMT and MC scheduling domains this adds the BOOK scheduling
domain. This is useful for machines that have a four level cache hierarchy
and but do not fall into the NUMA category.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---
arch/s390/defconfig | 1
include/linux/sched.h | 19 +++++++
include/linux/topology.h | 6 ++
kernel/sched.c | 112 ++++++++++++++++++++++++++++++++++++++++++++---
kernel/sched_fair.c | 11 ++--
5 files changed, 137 insertions(+), 12 deletions(-)
diff -urpN linux-2.6/arch/s390/defconfig linux-2.6-patched/arch/s390/defconfig
--- linux-2.6/arch/s390/defconfig 2010-08-02 00:11:14.000000000 +0200
+++ linux-2.6-patched/arch/s390/defconfig 2010-08-11 13:47:23.000000000 +0200
@@ -248,6 +248,7 @@ CONFIG_64BIT=y
CONFIG_SMP=y
CONFIG_NR_CPUS=32
CONFIG_HOTPLUG_CPU=y
+# CONFIG_SCHED_BOOK is not set
CONFIG_COMPAT=y
CONFIG_SYSVIPC_COMPAT=y
CONFIG_AUDIT_ARCH=y
diff -urpN linux-2.6/include/linux/sched.h linux-2.6-patched/include/linux/sched.h
--- linux-2.6/include/linux/sched.h 2010-08-11 13:47:16.000000000 +0200
+++ linux-2.6-patched/include/linux/sched.h 2010-08-11 13:47:23.000000000 +0200
@@ -807,7 +807,9 @@ enum powersavings_balance_level {
MAX_POWERSAVINGS_BALANCE_LEVELS
};

-extern int sched_mc_power_savings, sched_smt_power_savings;
+extern int sched_smt_power_savings;
+extern int sched_mc_power_savings;
+extern int sched_book_power_savings;

static inline int sd_balance_for_mc_power(void)
{
@@ -820,11 +822,23 @@ static inline int sd_balance_for_mc_powe
return 0;
}

-static inline int sd_balance_for_package_power(void)
+static inline int sd_balance_for_book_power(void)
{
if (sched_mc_power_savings | sched_smt_power_savings)
return SD_POWERSAVINGS_BALANCE;

+ if (!sched_book_power_savings)
+ return SD_PREFER_SIBLING;
+
+ return 0;
+}
+
+static inline int sd_balance_for_package_power(void)
+{
+ if (sched_book_power_savings | sched_mc_power_savings |
+ sched_smt_power_savings)
+ return SD_POWERSAVINGS_BALANCE;
+
return SD_PREFER_SIBLING;
}

@@ -875,6 +889,7 @@ enum sched_domain_level {
SD_LV_NONE = 0,
SD_LV_SIBLING,
SD_LV_MC,
+ SD_LV_BOOK,
SD_LV_CPU,
SD_LV_NODE,
SD_LV_ALLNODES,
diff -urpN linux-2.6/include/linux/topology.h linux-2.6-patched/include/linux/topology.h
--- linux-2.6/include/linux/topology.h 2010-08-11 13:47:16.000000000 +0200
+++ linux-2.6-patched/include/linux/topology.h 2010-08-11 13:47:23.000000000 +0200
@@ -201,6 +201,12 @@ int arch_update_cpu_topology(void);
.balance_interval = 64, \
}

+#ifdef CONFIG_SCHED_BOOK
+#ifndef SD_BOOK_INIT
+#error Please define an appropriate SD_BOOK_INIT in include/asm/topology.h!!!
+#endif
+#endif /* CONFIG_SCHED_BOOK */
+
#ifdef CONFIG_NUMA
#ifndef SD_NODE_INIT
#error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
diff -urpN linux-2.6/kernel/sched.c linux-2.6-patched/kernel/sched.c
--- linux-2.6/kernel/sched.c 2010-08-11 13:47:23.000000000 +0200
+++ linux-2.6-patched/kernel/sched.c 2010-08-11 13:47:23.000000000 +0200
@@ -6472,7 +6472,9 @@ static void sched_domain_node_span(int n
}
#endif /* CONFIG_NUMA */

-int sched_smt_power_savings = 0, sched_mc_power_savings = 0;
+int sched_smt_power_savings;
+int sched_mc_power_savings;
+int sched_book_power_savings;

/*
* The cpus mask in sched_group and sched_domain hangs off the end.
@@ -6500,6 +6502,7 @@ struct s_data {
cpumask_var_t nodemask;
cpumask_var_t this_sibling_map;
cpumask_var_t this_core_map;
+ cpumask_var_t this_book_map;
cpumask_var_t send_covered;
cpumask_var_t tmpmask;
struct sched_group **sched_group_nodes;
@@ -6511,6 +6514,7 @@ enum s_alloc {
sa_rootdomain,
sa_tmpmask,
sa_send_covered,
+ sa_this_book_map,
sa_this_core_map,
sa_this_sibling_map,
sa_nodemask,
@@ -6564,6 +6568,31 @@ cpu_to_core_group(int cpu, const struct
}
#endif /* CONFIG_SCHED_MC */

+/*
+ * book sched-domains:
+ */
+#ifdef CONFIG_SCHED_BOOK
+static DEFINE_PER_CPU(struct static_sched_domain, book_domains);
+static DEFINE_PER_CPU(struct static_sched_group, sched_group_book);
+
+static int
+cpu_to_book_group(int cpu, const struct cpumask *cpu_map,
+ struct sched_group **sg, struct cpumask *mask)
+{
+ int group = cpu;
+#ifdef CONFIG_SCHED_MC
+ cpumask_and(mask, cpu_coregroup_mask(cpu), cpu_map);
+ group = cpumask_first(mask);
+#elif defined(CONFIG_SCHED_SMT)
+ cpumask_and(mask, topology_thread_cpumask(cpu), cpu_map);
+ group = cpumask_first(mask);
+#endif
+ if (sg)
+ *sg = &per_cpu(sched_group_book, group).sg;
+ return group;
+}
+#endif /* CONFIG_SCHED_BOOK */
+
static DEFINE_PER_CPU(struct static_sched_domain, phys_domains);
static DEFINE_PER_CPU(struct static_sched_group, sched_group_phys);

@@ -6572,7 +6601,10 @@ cpu_to_phys_group(int cpu, const struct
struct sched_group **sg, struct cpumask *mask)
{
int group;
-#ifdef CONFIG_SCHED_MC
+#ifdef CONFIG_SCHED_BOOK
+ cpumask_and(mask, cpu_book_mask(cpu), cpu_map);
+ group = cpumask_first(mask);
+#elif defined(CONFIG_SCHED_MC)
cpumask_and(mask, cpu_coregroup_mask(cpu), cpu_map);
group = cpumask_first(mask);
#elif defined(CONFIG_SCHED_SMT)
@@ -6833,6 +6865,9 @@ SD_INIT_FUNC(CPU)
#ifdef CONFIG_SCHED_MC
SD_INIT_FUNC(MC)
#endif
+#ifdef CONFIG_SCHED_BOOK
+ SD_INIT_FUNC(BOOK)
+#endif

static int default_relax_domain_level = -1;

@@ -6882,6 +6917,8 @@ static void __free_domain_allocs(struct
free_cpumask_var(d->tmpmask); /* fall through */
case sa_send_covered:
free_cpumask_var(d->send_covered); /* fall through */
+ case sa_this_book_map:
+ free_cpumask_var(d->this_book_map); /* fall through */
case sa_this_core_map:
free_cpumask_var(d->this_core_map); /* fall through */
case sa_this_sibling_map:
@@ -6928,8 +6965,10 @@ static enum s_alloc __visit_domain_alloc
return sa_nodemask;
if (!alloc_cpumask_var(&d->this_core_map, GFP_KERNEL))
return sa_this_sibling_map;
- if (!alloc_cpumask_var(&d->send_covered, GFP_KERNEL))
+ if (!alloc_cpumask_var(&d->this_book_map, GFP_KERNEL))
return sa_this_core_map;
+ if (!alloc_cpumask_var(&d->send_covered, GFP_KERNEL))
+ return sa_this_book_map;
if (!alloc_cpumask_var(&d->tmpmask, GFP_KERNEL))
return sa_send_covered;
d->rd = alloc_rootdomain();
@@ -6987,6 +7026,23 @@ static struct sched_domain *__build_cpu_
return sd;
}

+static struct sched_domain *__build_book_sched_domain(struct s_data *d,
+ const struct cpumask *cpu_map, struct sched_domain_attr *attr,
+ struct sched_domain *parent, int i)
+{
+ struct sched_domain *sd = parent;
+#ifdef CONFIG_SCHED_BOOK
+ sd = &per_cpu(book_domains, i).sd;
+ SD_INIT(sd, BOOK);
+ set_domain_attribute(sd, attr);
+ cpumask_and(sched_domain_span(sd), cpu_map, cpu_book_mask(i));
+ sd->parent = parent;
+ parent->child = sd;
+ cpu_to_book_group(i, cpu_map, &sd->groups, d->tmpmask);
+#endif
+ return sd;
+}
+
static struct sched_domain *__build_mc_sched_domain(struct s_data *d,
const struct cpumask *cpu_map, struct sched_domain_attr *attr,
struct sched_domain *parent, int i)
@@ -7044,6 +7100,15 @@ static void build_sched_groups(struct s_
d->send_covered, d->tmpmask);
break;
#endif
+#ifdef CONFIG_SCHED_BOOK
+ case SD_LV_BOOK: /* set up book groups */
+ cpumask_and(d->this_book_map, cpu_map, cpu_book_mask(cpu));
+ if (cpu == cpumask_first(d->this_book_map))
+ init_sched_build_groups(d->this_book_map, cpu_map,
+ &cpu_to_book_group,
+ d->send_covered, d->tmpmask);
+ break;
+#endif
case SD_LV_CPU: /* set up physical groups */
cpumask_and(d->nodemask, cpumask_of_node(cpu), cpu_map);
if (!cpumask_empty(d->nodemask))
@@ -7091,12 +7156,14 @@ static int __build_sched_domains(const s

sd = __build_numa_sched_domains(&d, cpu_map, attr, i);
sd = __build_cpu_sched_domain(&d, cpu_map, attr, sd, i);
+ sd = __build_book_sched_domain(&d, cpu_map, attr, sd, i);
sd = __build_mc_sched_domain(&d, cpu_map, attr, sd, i);
sd = __build_smt_sched_domain(&d, cpu_map, attr, sd, i);
}

for_each_cpu(i, cpu_map) {
build_sched_groups(&d, SD_LV_SIBLING, cpu_map, i);
+ build_sched_groups(&d, SD_LV_BOOK, cpu_map, i);
build_sched_groups(&d, SD_LV_MC, cpu_map, i);
}

@@ -7127,6 +7194,12 @@ static int __build_sched_domains(const s
init_sched_groups_power(i, sd);
}
#endif
+#ifdef CONFIG_SCHED_BOOK
+ for_each_cpu(i, cpu_map) {
+ sd = &per_cpu(book_domains, i).sd;
+ init_sched_groups_power(i, sd);
+ }
+#endif

for_each_cpu(i, cpu_map) {
sd = &per_cpu(phys_domains, i).sd;
@@ -7152,6 +7225,8 @@ static int __build_sched_domains(const s
sd = &per_cpu(cpu_domains, i).sd;
#elif defined(CONFIG_SCHED_MC)
sd = &per_cpu(core_domains, i).sd;
+#elif defined(CONFIG_SCHED_BOOK)
+ sd = &per_cpu(book_domains, i).sd;
#else
sd = &per_cpu(phys_domains, i).sd;
#endif
@@ -7368,7 +7443,8 @@ match2:
mutex_unlock(&sched_domains_mutex);
}

-#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
+#if defined(CONFIG_SCHED_BOOK) || defined(CONFIG_SCHED_MC) || \
+ defined(CONFIG_SCHED_SMT)
static void arch_reinit_sched_domains(void)
{
get_online_cpus();
@@ -7405,6 +7481,9 @@ static ssize_t sched_power_savings_store
case SD_LV_MC:
sched_mc_power_savings = level;
break;
+ case SD_LV_BOOK:
+ sched_book_power_savings = level;
+ break;
default:
break;
}
@@ -7414,6 +7493,24 @@ static ssize_t sched_power_savings_store
return count;
}

+#ifdef CONFIG_SCHED_BOOK
+static ssize_t sched_book_power_savings_show(struct sysdev_class *class,
+ struct sysdev_class_attribute *attr,
+ char *page)
+{
+ return sprintf(page, "%u\n", sched_book_power_savings);
+}
+static ssize_t sched_book_power_savings_store(struct sysdev_class *class,
+ struct sysdev_class_attribute *attr,
+ const char *buf, size_t count)
+{
+ return sched_power_savings_store(buf, count, SD_LV_BOOK);
+}
+static SYSDEV_CLASS_ATTR(sched_book_power_savings, 0644,
+ sched_book_power_savings_show,
+ sched_book_power_savings_store);
+#endif
+
#ifdef CONFIG_SCHED_MC
static ssize_t sched_mc_power_savings_show(struct sysdev_class *class,
struct sysdev_class_attribute *attr,
@@ -7464,9 +7561,14 @@ int __init sched_create_sysfs_power_savi
err = sysfs_create_file(&cls->kset.kobj,
&attr_sched_mc_power_savings.attr);
#endif
+#ifdef CONFIG_SCHED_BOOK
+ if (!err && book_capable())
+ err = sysfs_create_file(&cls->kset.kobj,
+ &attr_sched_book_power_savings.attr);
+#endif
return err;
}
-#endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
+#endif /* CONFIG_SCHED_BOOK || CONFIG_SCHED_MC || CONFIG_SCHED_SMT */

/*
* Update cpusets according to cpu_active mask. If cpusets are
diff -urpN linux-2.6/kernel/sched_fair.c linux-2.6-patched/kernel/sched_fair.c
--- linux-2.6/kernel/sched_fair.c 2010-08-11 13:47:16.000000000 +0200
+++ linux-2.6-patched/kernel/sched_fair.c 2010-08-11 13:47:23.000000000 +0200
@@ -2039,7 +2039,8 @@ struct sd_lb_stats {
unsigned long busiest_group_capacity;

int group_imb; /* Is there imbalance in this sd */
-#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
+#if defined(CONFIG_SCHED_BOOK) || defined(CONFIG_SCHED_MC) || \
+ defined(CONFIG_SCHED_SMT)
int power_savings_balance; /* Is powersave balance needed for this sd */
struct sched_group *group_min; /* Least loaded group in sd */
struct sched_group *group_leader; /* Group which relieves group_min */
@@ -2096,8 +2097,8 @@ static inline int get_sd_load_idx(struct
return load_idx;
}

-
-#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
+#if defined(CONFIG_SCHED_BOOK) || defined(CONFIG_SCHED_MC) || \
+ defined(CONFIG_SCHED_SMT)
/**
* init_sd_power_savings_stats - Initialize power savings statistics for
* the given sched_domain, during load balancing.
@@ -2217,7 +2218,7 @@ static inline int check_power_save_busie
return 1;

}
-#else /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
+#else /* CONFIG_SCHED_BOOK || CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
static inline void init_sd_power_savings_stats(struct sched_domain *sd,
struct sd_lb_stats *sds, enum cpu_idle_type idle)
{
@@ -2235,7 +2236,7 @@ static inline int check_power_save_busie
{
return 0;
}
-#endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
+#endif /* CONFIG_SCHED_BOOK || CONFIG_SCHED_MC || CONFIG_SCHED_SMT */


unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu)


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