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>
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index b0c870b..8b35fbd 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -98,6 +98,9 @@
/* 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 @@
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 @@
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 @@
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 @@
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 @@
}
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
.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 @@
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 @@
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 @@
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)