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sched, cpuset: customize sched domains, core 

[rebased for sched-devel/latest]

 - Add a new cpuset file, having levels:
     sched_relax_domain_level

 - Modify partition_sched_domains() and build_sched_domains()
   to take attributes parameter passed from cpuset.

 - Fill newidle_idx for node domains which currently unused but
   might be required if sched_relax_domain_level become higher.

 - We can change the default level by boot option 'relax_domain_level='.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Hidetoshi Seto 2008-04-15 14:04:23 +09:00 committed by Ingo Molnar
parent 4d5f35533f
commit 1d3504fcf5
7 changed files with 161 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/asm-ia64/topology.h
View File

@ -93,7 +93,7 @@ void build_cpu_to_node_map(void);
.cache_nice_tries = 2, \
.busy_idx = 3, \
.idle_idx = 2, \
.newidle_idx = 0, /* unused */ \
.newidle_idx = 2, \
.wake_idx = 1, \
.forkexec_idx = 1, \
.flags = SD_LOAD_BALANCE \

2
include/asm-sh/topology.h
View File

@ -16,7 +16,7 @@
.cache_nice_tries = 2, \
.busy_idx = 3, \
.idle_idx = 2, \
.newidle_idx = 0, \
.newidle_idx = 2, \
.wake_idx = 1, \
.forkexec_idx = 1, \
.flags = SD_LOAD_BALANCE \

2
include/asm-x86/topology.h
View File

@ -147,7 +147,7 @@ extern unsigned long node_remap_size[];
# define SD_CACHE_NICE_TRIES 2
# define SD_IDLE_IDX 2
# define SD_NEWIDLE_IDX 0
# define SD_NEWIDLE_IDX 2
# define SD_FORKEXEC_IDX 1
#endif

23
include/linux/sched.h
View File

@ -704,6 +704,7 @@ enum cpu_idle_type {
#define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
#define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
#define SD_SERIALIZE 1024 /* Only a single load balancing instance */
#define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
#define BALANCE_FOR_MC_POWER \
(sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
@ -733,6 +734,24 @@ struct sched_group {
u32 reciprocal_cpu_power;
};
enum sched_domain_level {
SD_LV_NONE = 0,
SD_LV_SIBLING,
SD_LV_MC,
SD_LV_CPU,
SD_LV_NODE,
SD_LV_ALLNODES,
SD_LV_MAX
};
struct sched_domain_attr {
int relax_domain_level;
};
#define SD_ATTR_INIT (struct sched_domain_attr) { \
.relax_domain_level = -1, \
}
struct sched_domain {
/* These fields must be setup */
struct sched_domain *parent; /* top domain must be null terminated */
@ -750,6 +769,7 @@ struct sched_domain {
unsigned int wake_idx;
unsigned int forkexec_idx;
int flags; /* See SD_* */
enum sched_domain_level level;
/* Runtime fields. */
unsigned long last_balance; /* init to jiffies. units in jiffies */
@ -789,7 +809,8 @@ struct sched_domain {
#endif
};
extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new);
extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
struct sched_domain_attr *dattr_new);
extern int arch_reinit_sched_domains(void);
#endif /* CONFIG_SMP */

61
kernel/cpuset.c
View File

@ -98,6 +98,9 @@ struct cpuset {
/* partition number for rebuild_sched_domains() */
int pn;
/* for custom sched domain */
int relax_domain_level;
/* used for walking a cpuset heirarchy */
struct list_head stack_list;
};
@ -478,6 +481,16 @@ static int cpusets_overlap(struct cpuset *a, struct cpuset *b)
return cpus_intersects(a->cpus_allowed, b->cpus_allowed);
}
static void
update_domain_attr(struct sched_domain_attr *dattr, struct cpuset *c)
{
if (!dattr)
return;
if (dattr->relax_domain_level < c->relax_domain_level)
dattr->relax_domain_level = c->relax_domain_level;
return;
}
/*
* rebuild_sched_domains()
*
@ -553,12 +566,14 @@ static void rebuild_sched_domains(void)
int csn; /* how many cpuset ptrs in csa so far */
int i, j, k; /* indices for partition finding loops */
cpumask_t *doms; /* resulting partition; i.e. sched domains */
struct sched_domain_attr *dattr; /* attributes for custom domains */
int ndoms; /* number of sched domains in result */
int nslot; /* next empty doms[] cpumask_t slot */
q = NULL;
csa = NULL;
doms = NULL;
dattr = NULL;
/* Special case for the 99% of systems with one, full, sched domain */
if (is_sched_load_balance(&top_cpuset)) {
@ -566,6 +581,11 @@ static void rebuild_sched_domains(void)
doms = kmalloc(sizeof(cpumask_t), GFP_KERNEL);
if (!doms)
goto rebuild;
dattr = kmalloc(sizeof(struct sched_domain_attr), GFP_KERNEL);
if (dattr) {
*dattr = SD_ATTR_INIT;
update_domain_attr(dattr, &top_cpuset);
}
*doms = top_cpuset.cpus_allowed;
goto rebuild;
}
@ -622,6 +642,7 @@ restart:
doms = kmalloc(ndoms * sizeof(cpumask_t), GFP_KERNEL);
if (!doms)
goto rebuild;
dattr = kmalloc(ndoms * sizeof(struct sched_domain_attr), GFP_KERNEL);
for (nslot = 0, i = 0; i < csn; i++) {
struct cpuset *a = csa[i];
@ -644,12 +665,15 @@ restart:
}
cpus_clear(*dp);
if (dattr)
*(dattr + nslot) = SD_ATTR_INIT;
for (j = i; j < csn; j++) {
struct cpuset *b = csa[j];
if (apn == b->pn) {
cpus_or(*dp, *dp, b->cpus_allowed);
b->pn = -1;
update_domain_attr(dattr, b);
}
}
nslot++;
@ -660,7 +684,7 @@ restart:
rebuild:
/* Have scheduler rebuild sched domains */
get_online_cpus();
partition_sched_domains(ndoms, doms);
partition_sched_domains(ndoms, doms, dattr);
put_online_cpus();
done:
@ -668,6 +692,7 @@ done:
kfifo_free(q);
kfree(csa);
/* Don't kfree(doms) -- partition_sched_domains() does that. */
/* Don't kfree(dattr) -- partition_sched_domains() does that. */
}
static inline int started_after_time(struct task_struct *t1,
@ -1011,6 +1036,21 @@ static int update_memory_pressure_enabled(struct cpuset *cs, char *buf)
return 0;
}
static int update_relax_domain_level(struct cpuset *cs, char *buf)
{
int val = simple_strtol(buf, NULL, 10);
if (val < 0)
val = -1;
if (val != cs->relax_domain_level) {
cs->relax_domain_level = val;
rebuild_sched_domains();
}
return 0;
}
/*
* update_flag - read a 0 or a 1 in a file and update associated flag
* bit: the bit to update (CS_CPU_EXCLUSIVE, CS_MEM_EXCLUSIVE,
@ -1202,6 +1242,7 @@ typedef enum {
FILE_CPU_EXCLUSIVE,
FILE_MEM_EXCLUSIVE,
FILE_SCHED_LOAD_BALANCE,
FILE_SCHED_RELAX_DOMAIN_LEVEL,
FILE_MEMORY_PRESSURE_ENABLED,
FILE_MEMORY_PRESSURE,
FILE_SPREAD_PAGE,
@ -1256,6 +1297,9 @@ static ssize_t cpuset_common_file_write(struct cgroup *cont,
case FILE_SCHED_LOAD_BALANCE:
retval = update_flag(CS_SCHED_LOAD_BALANCE, cs, buffer);
break;
case FILE_SCHED_RELAX_DOMAIN_LEVEL:
retval = update_relax_domain_level(cs, buffer);
break;
case FILE_MEMORY_MIGRATE:
retval = update_flag(CS_MEMORY_MIGRATE, cs, buffer);
break;
@ -1354,6 +1398,9 @@ static ssize_t cpuset_common_file_read(struct cgroup *cont,
case FILE_SCHED_LOAD_BALANCE:
*s++ = is_sched_load_balance(cs) ? '1' : '0';
break;
case FILE_SCHED_RELAX_DOMAIN_LEVEL:
s += sprintf(s, "%d", cs->relax_domain_level);
break;
case FILE_MEMORY_MIGRATE:
*s++ = is_memory_migrate(cs) ? '1' : '0';
break;
@ -1424,6 +1471,13 @@ static struct cftype cft_sched_load_balance = {
.private = FILE_SCHED_LOAD_BALANCE,
};
static struct cftype cft_sched_relax_domain_level = {
.name = "sched_relax_domain_level",
.read = cpuset_common_file_read,
.write = cpuset_common_file_write,
.private = FILE_SCHED_RELAX_DOMAIN_LEVEL,
};
static struct cftype cft_memory_migrate = {
.name = "memory_migrate",
.read = cpuset_common_file_read,
@ -1475,6 +1529,9 @@ static int cpuset_populate(struct cgroup_subsys *ss, struct cgroup *cont)
return err;
if ((err = cgroup_add_file(cont, ss, &cft_sched_load_balance)) < 0)
return err;
if ((err = cgroup_add_file(cont, ss,
&cft_sched_relax_domain_level)) < 0)
return err;
if ((err = cgroup_add_file(cont, ss, &cft_memory_pressure)) < 0)
return err;
if ((err = cgroup_add_file(cont, ss, &cft_spread_page)) < 0)
@ -1559,6 +1616,7 @@ static struct cgroup_subsys_state *cpuset_create(
nodes_clear(cs->mems_allowed);
cs->mems_generation = cpuset_mems_generation++;
fmeter_init(&cs->fmeter);
cs->relax_domain_level = -1;
cs->parent = parent;
number_of_cpusets++;
@ -1631,6 +1689,7 @@ int __init cpuset_init(void)
fmeter_init(&top_cpuset.fmeter);
top_cpuset.mems_generation = cpuset_mems_generation++;
set_bit(CS_SCHED_LOAD_BALANCE, &top_cpuset.flags);
top_cpuset.relax_domain_level = -1;
err = register_filesystem(&cpuset_fs_type);
if (err < 0)

78
kernel/sched.c
View File

@ -6771,6 +6771,7 @@ static noinline void sd_init_##type(struct sched_domain *sd) \
{ \
memset(sd, 0, sizeof(*sd)); \
*sd = SD_##type##_INIT; \
sd->level = SD_LV_##type; \
}
SD_INIT_FUNC(CPU)
@ -6819,11 +6820,42 @@ struct allmasks {
#define SCHED_CPUMASK_VAR(v, a) cpumask_t *v = (cpumask_t *) \
((unsigned long)(a) + offsetof(struct allmasks, v))
static int default_relax_domain_level = -1;
static int __init setup_relax_domain_level(char *str)
{
default_relax_domain_level = simple_strtoul(str, NULL, 0);
return 1;
}
__setup("relax_domain_level=", setup_relax_domain_level);
static void set_domain_attribute(struct sched_domain *sd,
struct sched_domain_attr *attr)
{
int request;
if (!attr || attr->relax_domain_level < 0) {
if (default_relax_domain_level < 0)
return;
else
request = default_relax_domain_level;
} else
request = attr->relax_domain_level;
if (request < sd->level) {
/* turn off idle balance on this domain */
sd->flags &= ~(SD_WAKE_IDLE|SD_BALANCE_NEWIDLE);
} else {
/* turn on idle balance on this domain */
sd->flags |= (SD_WAKE_IDLE_FAR|SD_BALANCE_NEWIDLE);
}
}
/*
* Build sched domains for a given set of cpus and attach the sched domains
* to the individual cpus
*/
static int build_sched_domains(const cpumask_t *cpu_map)
static int __build_sched_domains(const cpumask_t *cpu_map,
struct sched_domain_attr *attr)
{
int i;
struct root_domain *rd;
@ -6887,6 +6919,7 @@ static int build_sched_domains(const cpumask_t *cpu_map)
SD_NODES_PER_DOMAIN*cpus_weight(*nodemask)) {
sd = &per_cpu(allnodes_domains, i);
SD_INIT(sd, ALLNODES);
set_domain_attribute(sd, attr);
sd->span = *cpu_map;
cpu_to_allnodes_group(i, cpu_map, &sd->groups, tmpmask);
p = sd;
@ -6896,6 +6929,7 @@ static int build_sched_domains(const cpumask_t *cpu_map)
sd = &per_cpu(node_domains, i);
SD_INIT(sd, NODE);
set_domain_attribute(sd, attr);
sched_domain_node_span(cpu_to_node(i), &sd->span);
sd->parent = p;
if (p)
@ -6906,6 +6940,7 @@ static int build_sched_domains(const cpumask_t *cpu_map)
p = sd;
sd = &per_cpu(phys_domains, i);
SD_INIT(sd, CPU);
set_domain_attribute(sd, attr);
sd->span = *nodemask;
sd->parent = p;
if (p)
@ -6916,6 +6951,7 @@ static int build_sched_domains(const cpumask_t *cpu_map)
p = sd;
sd = &per_cpu(core_domains, i);
SD_INIT(sd, MC);
set_domain_attribute(sd, attr);
sd->span = cpu_coregroup_map(i);
cpus_and(sd->span, sd->span, *cpu_map);
sd->parent = p;
@ -6927,6 +6963,7 @@ static int build_sched_domains(const cpumask_t *cpu_map)
p = sd;
sd = &per_cpu(cpu_domains, i);
SD_INIT(sd, SIBLING);
set_domain_attribute(sd, attr);
sd->span = per_cpu(cpu_sibling_map, i);
cpus_and(sd->span, sd->span, *cpu_map);
sd->parent = p;
@ -7124,8 +7161,15 @@ error:
#endif
}
static int build_sched_domains(const cpumask_t *cpu_map)
{
return __build_sched_domains(cpu_map, NULL);
}
static cpumask_t *doms_cur; /* current sched domains */
static int ndoms_cur; /* number of sched domains in 'doms_cur' */
static struct sched_domain_attr *dattr_cur; /* attribues of custom domains
in 'doms_cur' */
/*
* Special case: If a kmalloc of a doms_cur partition (array of
@ -7153,6 +7197,7 @@ static int arch_init_sched_domains(const cpumask_t *cpu_map)
if (!doms_cur)
doms_cur = &fallback_doms;
cpus_andnot(*doms_cur, *cpu_map, cpu_isolated_map);
dattr_cur = NULL;
err = build_sched_domains(doms_cur);
register_sched_domain_sysctl();
@ -7182,6 +7227,22 @@ static void detach_destroy_domains(const cpumask_t *cpu_map)
arch_destroy_sched_domains(cpu_map, &tmpmask);
}
/* handle null as "default" */
static int dattrs_equal(struct sched_domain_attr *cur, int idx_cur,
struct sched_domain_attr *new, int idx_new)
{
struct sched_domain_attr tmp;
/* fast path */
if (!new && !cur)
return 1;
tmp = SD_ATTR_INIT;
return !memcmp(cur ? (cur + idx_cur) : &tmp,
new ? (new + idx_new) : &tmp,
sizeof(struct sched_domain_attr));
}
/*
* Partition sched domains as specified by the 'ndoms_new'
* cpumasks in the array doms_new[] of cpumasks. This compares
@ -7203,7 +7264,8 @@ static void detach_destroy_domains(const cpumask_t *cpu_map)
*
* Call with hotplug lock held
*/
void partition_sched_domains(int ndoms_new, cpumask_t *doms_new)
void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
struct sched_domain_attr *dattr_new)
{
int i, j;
@ -7216,12 +7278,14 @@ void partition_sched_domains(int ndoms_new, cpumask_t *doms_new)
ndoms_new = 1;
doms_new = &fallback_doms;
cpus_andnot(doms_new[0], cpu_online_map, cpu_isolated_map);
dattr_new = NULL;
}
/* Destroy deleted domains */
for (i = 0; i < ndoms_cur; i++) {
for (j = 0; j < ndoms_new; j++) {
if (cpus_equal(doms_cur[i], doms_new[j]))
if (cpus_equal(doms_cur[i], doms_new[j])
&& dattrs_equal(dattr_cur, i, dattr_new, j))
goto match1;
}
/* no match - a current sched domain not in new doms_new[] */
@ -7233,11 +7297,13 @@ match1:
/* Build new domains */
for (i = 0; i < ndoms_new; i++) {
for (j = 0; j < ndoms_cur; j++) {
if (cpus_equal(doms_new[i], doms_cur[j]))
if (cpus_equal(doms_new[i], doms_cur[j])
&& dattrs_equal(dattr_new, i, dattr_cur, j))
goto match2;
}
/* no match - add a new doms_new */
build_sched_domains(doms_new + i);
__build_sched_domains(doms_new + i,
dattr_new ? dattr_new + i : NULL);
match2:
;
}
@ -7245,7 +7311,9 @@ match2:
/* Remember the new sched domains */
if (doms_cur != &fallback_doms)
kfree(doms_cur);
kfree(dattr_cur); /* kfree(NULL) is safe */
doms_cur = doms_new;
dattr_cur = dattr_new;
ndoms_cur = ndoms_new;
register_sched_domain_sysctl();

4
kernel/sched_fair.c
View File

@ -940,7 +940,9 @@ static int wake_idle(int cpu, struct task_struct *p)
return cpu;
for_each_domain(cpu, sd) {
if (sd->flags & SD_WAKE_IDLE) {
if ((sd->flags & SD_WAKE_IDLE)
|| ((sd->flags & SD_WAKE_IDLE_FAR)
&& !task_hot(p, task_rq(p)->clock, sd))) {
cpus_and(tmp, sd->span, p->cpus_allowed);
for_each_cpu_mask(i, tmp) {
if (idle_cpu(i)) {