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sched: wrap sched_group and sched_domain cpumask accesses.

Browse source 
Impact: trivial wrap of member accesses

This eases the transition in the next patch.

We also get rid of a temporary cpumask in find_idlest_cpu() thanks to
for_each_cpu_and, and sched_balance_self() due to getting weight before
setting sd to NULL.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Rusty Russell 2008-11-25 02:35:04 +10:30 committed by Ingo Molnar
parent 1e5ce4f4a7
commit 758b2cdc6f
5 changed files with 73 additions and 67 deletions
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10
include/linux/sched.h
View file

@ -786,6 +786,11 @@ struct sched_group {
u32 reciprocal_cpu_power;
};
static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
{
return &sg->cpumask;
}
enum sched_domain_level {
SD_LV_NONE = 0,
SD_LV_SIBLING,
@ -866,6 +871,11 @@ struct sched_domain {
#endif
};
static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
{
return &sd->span;
}
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);

114
kernel/sched.c
View file

@ -1501,7 +1501,7 @@ static int tg_shares_up(struct task_group *tg, void *data)
struct sched_domain *sd = data;
int i;
for_each_cpu_mask(i, sd->span) {
for_each_cpu(i, sched_domain_span(sd)) {
/*
* If there are currently no tasks on the cpu pretend there
* is one of average load so that when a new task gets to
@ -1522,7 +1522,7 @@ static int tg_shares_up(struct task_group *tg, void *data)
if (!sd->parent || !(sd->parent->flags & SD_LOAD_BALANCE))
shares = tg->shares;
for_each_cpu_mask(i, sd->span)
for_each_cpu(i, sched_domain_span(sd))
update_group_shares_cpu(tg, i, shares, rq_weight);
return 0;
@ -2053,15 +2053,17 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p, int this_cpu)
int i;
/* Skip over this group if it has no CPUs allowed */
if (!cpus_intersects(group->cpumask, p->cpus_allowed))
if (!cpumask_intersects(sched_group_cpus(group),
&p->cpus_allowed))
continue;
local_group = cpu_isset(this_cpu, group->cpumask);
local_group = cpumask_test_cpu(this_cpu,
sched_group_cpus(group));
/* Tally up the load of all CPUs in the group */
avg_load = 0;
for_each_cpu(i, &group->cpumask) {
for_each_cpu(i, sched_group_cpus(group)) {
/* Bias balancing toward cpus of our domain */
if (local_group)
load = source_load(i, load_idx);
@ -2093,17 +2095,14 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p, int this_cpu)
* find_idlest_cpu - find the idlest cpu among the cpus in group.
*/
static int
find_idlest_cpu(struct sched_group *group, struct task_struct *p, int this_cpu,
cpumask_t *tmp)
find_idlest_cpu(struct sched_group *group, struct task_struct *p, int this_cpu)
{
unsigned long load, min_load = ULONG_MAX;
int idlest = -1;
int i;
/* Traverse only the allowed CPUs */
cpus_and(*tmp, group->cpumask, p->cpus_allowed);
for_each_cpu(i, tmp) {
for_each_cpu_and(i, sched_group_cpus(group), &p->cpus_allowed) {
load = weighted_cpuload(i);
if (load < min_load || (load == min_load && i == this_cpu)) {
@ -2145,7 +2144,6 @@ static int sched_balance_self(int cpu, int flag)
update_shares(sd);
while (sd) {
cpumask_t span, tmpmask;
struct sched_group *group;
int new_cpu, weight;
@ -2154,14 +2152,13 @@ static int sched_balance_self(int cpu, int flag)
continue;
}
span = sd->span;
group = find_idlest_group(sd, t, cpu);
if (!group) {
sd = sd->child;
continue;
}
new_cpu = find_idlest_cpu(group, t, cpu, &tmpmask);
new_cpu = find_idlest_cpu(group, t, cpu);
if (new_cpu == -1 || new_cpu == cpu) {
/* Now try balancing at a lower domain level of cpu */
sd = sd->child;
@ -2170,10 +2167,10 @@ static int sched_balance_self(int cpu, int flag)
/* Now try balancing at a lower domain level of new_cpu */
cpu = new_cpu;
weight = cpumask_weight(sched_domain_span(sd));
sd = NULL;
weight = cpus_weight(span);
for_each_domain(cpu, tmp) {
if (weight <= cpus_weight(tmp->span))
if (weight <= cpumask_weight(sched_domain_span(tmp)))
break;
if (tmp->flags & flag)
sd = tmp;
@ -2218,7 +2215,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
cpu = task_cpu(p);
for_each_domain(this_cpu, sd) {
if (cpu_isset(cpu, sd->span)) {
if (cpumask_test_cpu(cpu, sched_domain_span(sd))) {
update_shares(sd);
break;
}
@ -2266,7 +2263,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
else {
struct sched_domain *sd;
for_each_domain(this_cpu, sd) {
if (cpu_isset(cpu, sd->span)) {
if (cpumask_test_cpu(cpu, sched_domain_span(sd))) {
schedstat_inc(sd, ttwu_wake_remote);
break;
}
@ -3109,10 +3106,11 @@ find_busiest_group(struct sched_domain *sd, int this_cpu,
unsigned long sum_avg_load_per_task;
unsigned long avg_load_per_task;
local_group = cpu_isset(this_cpu, group->cpumask);
local_group = cpumask_test_cpu(this_cpu,
sched_group_cpus(group));
if (local_group)
balance_cpu = first_cpu(group->cpumask);
balance_cpu = cpumask_first(sched_group_cpus(group));
/* Tally up the load of all CPUs in the group */
sum_weighted_load = sum_nr_running = avg_load = 0;
@ -3121,13 +3119,8 @@ find_busiest_group(struct sched_domain *sd, int this_cpu,
max_cpu_load = 0;
min_cpu_load = ~0UL;
for_each_cpu(i, &group->cpumask) {
struct rq *rq;
if (!cpu_isset(i, *cpus))
continue;
rq = cpu_rq(i);
for_each_cpu_and(i, sched_group_cpus(group), cpus) {
struct rq *rq = cpu_rq(i);
if (*sd_idle && rq->nr_running)
*sd_idle = 0;
@ -3238,8 +3231,8 @@ find_busiest_group(struct sched_domain *sd, int this_cpu,
*/
if ((sum_nr_running < min_nr_running) ||
(sum_nr_running == min_nr_running &&
first_cpu(group->cpumask) <
first_cpu(group_min->cpumask))) {
cpumask_first(sched_group_cpus(group)) <
cpumask_first(sched_group_cpus(group_min)))) {
group_min = group;
min_nr_running = sum_nr_running;
min_load_per_task = sum_weighted_load /
@ -3254,8 +3247,8 @@ find_busiest_group(struct sched_domain *sd, int this_cpu,
if (sum_nr_running <= group_capacity - 1) {
if (sum_nr_running > leader_nr_running ||
(sum_nr_running == leader_nr_running &&
first_cpu(group->cpumask) >
first_cpu(group_leader->cpumask))) {
cpumask_first(sched_group_cpus(group)) >
cpumask_first(sched_group_cpus(group_leader)))) {
group_leader = group;
leader_nr_running = sum_nr_running;
}
@ -3400,7 +3393,7 @@ find_busiest_queue(struct sched_group *group, enum cpu_idle_type idle,
unsigned long max_load = 0;
int i;
for_each_cpu(i, &group->cpumask) {
for_each_cpu(i, sched_group_cpus(group)) {
unsigned long wl;
if (!cpu_isset(i, *cpus))
@ -3746,7 +3739,7 @@ static void active_load_balance(struct rq *busiest_rq, int busiest_cpu)
/* Search for an sd spanning us and the target CPU. */
for_each_domain(target_cpu, sd) {
if ((sd->flags & SD_LOAD_BALANCE) &&
cpu_isset(busiest_cpu, sd->span))
cpumask_test_cpu(busiest_cpu, sched_domain_span(sd)))
break;
}
@ -6618,7 +6611,7 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
struct sched_group *group = sd->groups;
char str[256];
cpulist_scnprintf(str, sizeof(str), sd->span);
cpulist_scnprintf(str, sizeof(str), *sched_domain_span(sd));
cpus_clear(*groupmask);
printk(KERN_DEBUG "%*s domain %d: ", level, "", level);
@ -6633,11 +6626,11 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
printk(KERN_CONT "span %s level %s\n", str, sd->name);
if (!cpu_isset(cpu, sd->span)) {
if (!cpumask_test_cpu(cpu, sched_domain_span(sd))) {
printk(KERN_ERR "ERROR: domain->span does not contain "
"CPU%d\n", cpu);
}
if (!cpu_isset(cpu, group->cpumask)) {
if (!cpumask_test_cpu(cpu, sched_group_cpus(group))) {
printk(KERN_ERR "ERROR: domain->groups does not contain"
" CPU%d\n", cpu);
}
@ -6657,31 +6650,32 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
break;
}
if (!cpus_weight(group->cpumask)) {
if (!cpumask_weight(sched_group_cpus(group))) {
printk(KERN_CONT "\n");
printk(KERN_ERR "ERROR: empty group\n");
break;
}
if (cpus_intersects(*groupmask, group->cpumask)) {
if (cpumask_intersects(groupmask, sched_group_cpus(group))) {
printk(KERN_CONT "\n");
printk(KERN_ERR "ERROR: repeated CPUs\n");
break;
}
cpus_or(*groupmask, *groupmask, group->cpumask);
cpumask_or(groupmask, groupmask, sched_group_cpus(group));
cpulist_scnprintf(str, sizeof(str), group->cpumask);
cpulist_scnprintf(str, sizeof(str), *sched_group_cpus(group));
printk(KERN_CONT " %s", str);
group = group->next;
} while (group != sd->groups);
printk(KERN_CONT "\n");
if (!cpus_equal(sd->span, *groupmask))
if (!cpumask_equal(sched_domain_span(sd), groupmask))
printk(KERN_ERR "ERROR: groups don't span domain->span\n");
if (sd->parent && !cpus_subset(*groupmask, sd->parent->span))
if (sd->parent &&
!cpumask_subset(groupmask, sched_domain_span(sd->parent)))
printk(KERN_ERR "ERROR: parent span is not a superset "
"of domain->span\n");
return 0;
@ -6721,7 +6715,7 @@ static void sched_domain_debug(struct sched_domain *sd, int cpu)
static int sd_degenerate(struct sched_domain *sd)
{
if (cpus_weight(sd->span) == 1)
if (cpumask_weight(sched_domain_span(sd)) == 1)
return 1;
/* Following flags need at least 2 groups */
@ -6752,7 +6746,7 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
if (sd_degenerate(parent))
return 1;
if (!cpus_equal(sd->span, parent->span))
if (!cpumask_equal(sched_domain_span(sd), sched_domain_span(parent)))
return 0;
/* Does parent contain flags not in child? */
@ -6913,10 +6907,10 @@ init_sched_build_groups(const cpumask_t *span, const cpumask_t *cpu_map,
int group = group_fn(i, cpu_map, &sg, tmpmask);
int j;
if (cpu_isset(i, *covered))
if (cpumask_test_cpu(i, covered))
continue;
cpus_clear(sg->cpumask);
cpumask_clear(sched_group_cpus(sg));
sg->__cpu_power = 0;
for_each_cpu(j, span) {
@ -6924,7 +6918,7 @@ init_sched_build_groups(const cpumask_t *span, const cpumask_t *cpu_map,
continue;
cpu_set(j, *covered);
cpu_set(j, sg->cpumask);
cpumask_set_cpu(j, sched_group_cpus(sg));
}
if (!first)
first = sg;
@ -7119,11 +7113,11 @@ static void init_numa_sched_groups_power(struct sched_group *group_head)
if (!sg)
return;
do {
for_each_cpu(j, &sg->cpumask) {
for_each_cpu(j, sched_group_cpus(sg)) {
struct sched_domain *sd;
sd = &per_cpu(phys_domains, j);
if (j != first_cpu(sd->groups->cpumask)) {
if (j != cpumask_first(sched_group_cpus(sd->groups))) {
/*
* Only add "power" once for each
* physical package.
@ -7200,7 +7194,7 @@ static void init_sched_groups_power(int cpu, struct sched_domain *sd)
WARN_ON(!sd || !sd->groups);
if (cpu != first_cpu(sd->groups->cpumask))
if (cpu != cpumask_first(sched_group_cpus(sd->groups)))
return;
child = sd->child;
@ -7372,7 +7366,7 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
sd = &per_cpu(allnodes_domains, i);
SD_INIT(sd, ALLNODES);
set_domain_attribute(sd, attr);
sd->span = *cpu_map;
cpumask_copy(sched_domain_span(sd), cpu_map);
cpu_to_allnodes_group(i, cpu_map, &sd->groups, tmpmask);
p = sd;
sd_allnodes = 1;
@ -7382,18 +7376,19 @@ 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);
sched_domain_node_span(cpu_to_node(i), sched_domain_span(sd));
sd->parent = p;
if (p)
p->child = sd;
cpus_and(sd->span, sd->span, *cpu_map);
cpumask_and(sched_domain_span(sd),
sched_domain_span(sd), cpu_map);
#endif
p = sd;
sd = &per_cpu(phys_domains, i);
SD_INIT(sd, CPU);
set_domain_attribute(sd, attr);
sd->span = *nodemask;
cpumask_copy(sched_domain_span(sd), nodemask);
sd->parent = p;
if (p)
p->child = sd;
@ -7404,8 +7399,9 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
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);
*sched_domain_span(sd) = cpu_coregroup_map(i);
cpumask_and(sched_domain_span(sd),
sched_domain_span(sd), cpu_map);
sd->parent = p;
p->child = sd;
cpu_to_core_group(i, cpu_map, &sd->groups, tmpmask);
@ -7416,8 +7412,8 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
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);
cpumask_and(sched_domain_span(sd),
&per_cpu(cpu_sibling_map, i), cpu_map);
sd->parent = p;
p->child = sd;
cpu_to_cpu_group(i, cpu_map, &sd->groups, tmpmask);
@ -7503,7 +7499,7 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
sd->groups = sg;
}
sg->__cpu_power = 0;
sg->cpumask = *nodemask;
cpumask_copy(sched_group_cpus(sg), nodemask);
sg->next = sg;
cpus_or(*covered, *covered, *nodemask);
prev = sg;
@ -7530,7 +7526,7 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
goto error;
}
sg->__cpu_power = 0;
sg->cpumask = *tmpmask;
cpumask_copy(sched_group_cpus(sg), tmpmask);
sg->next = prev->next;
cpus_or(*covered, *covered, *tmpmask);
prev->next = sg;

10
kernel/sched_fair.c
View file

@ -1024,7 +1024,6 @@ static void yield_task_fair(struct rq *rq)
#if defined(ARCH_HAS_SCHED_WAKE_IDLE)
static int wake_idle(int cpu, struct task_struct *p)
{
cpumask_t tmp;
struct sched_domain *sd;
int i;
@ -1044,10 +1043,9 @@ static int wake_idle(int cpu, struct task_struct *p)
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);
cpus_and(tmp, tmp, cpu_active_map);
for_each_cpu_mask_nr(i, tmp) {
if (idle_cpu(i)) {
for_each_cpu_and(i, sched_domain_span(sd),
&p->cpus_allowed) {
if (cpu_active(i) && idle_cpu(i)) {
if (i != task_cpu(p)) {
schedstat_inc(p,
se.nr_wakeups_idle);
@ -1240,7 +1238,7 @@ static int select_task_rq_fair(struct task_struct *p, int sync)
* this_cpu and prev_cpu are present in:
*/
for_each_domain(this_cpu, sd) {
if (cpu_isset(prev_cpu, sd->span)) {
if (cpumask_test_cpu(prev_cpu, sched_domain_span(sd))) {
this_sd = sd;
break;
}

3
kernel/sched_rt.c
View file

@ -1017,7 +1017,8 @@ static int find_lowest_rq(struct task_struct *task)
cpumask_t domain_mask;
int best_cpu;
cpus_and(domain_mask, sd->span, *lowest_mask);
cpumask_and(&domain_mask, sched_domain_span(sd),
lowest_mask);
best_cpu = pick_optimal_cpu(this_cpu,
&domain_mask);

3
kernel/sched_stats.h
View file

@ -42,7 +42,8 @@ static int show_schedstat(struct seq_file *seq, void *v)
for_each_domain(cpu, sd) {
enum cpu_idle_type itype;
cpumask_scnprintf(mask_str, mask_len, sd->span);
cpumask_scnprintf(mask_str, mask_len,
*sched_domain_span(sd));
seq_printf(seq, "domain%d %s", dcount++, mask_str);
for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;
itype++) {