public-mirrors/linux
1
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-09-18 22:14:16 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

sched/topology: Record number of cores in sched group

Browse source 
When balancing sibling domains that have different number of cores,
tasks in respective sibling domain should be proportional to the
number of cores in each domain. In preparation of implementing such a
policy, record the number of cores in a scheduling group.

Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/04641eeb0e95c21224352f5743ecb93dfac44654.1688770494.git.tim.c.chen@linux.intel.com
This commit is contained in:
Tim C Chen 2023-07-07 15:57:01 -07:00 • committed by Peter Zijlstra
parent fee1759e4f
commit d24cb0d911
2 changed files with 12 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
kernel/sched/sched.h
View file

@ -1884,6 +1884,7 @@ struct sched_group {
atomic_t ref;
unsigned int group_weight;
unsigned int cores;
struct sched_group_capacity *sgc;
int asym_prefer_cpu; /* CPU of highest priority in group */
int flags;

12
kernel/sched/topology.c
View file

@ -1275,14 +1275,24 @@ build_sched_groups(struct sched_domain *sd, int cpu)
static void init_sched_groups_capacity(int cpu, struct sched_domain *sd)
{
struct sched_group *sg = sd->groups;
struct cpumask *mask = sched_domains_tmpmask2;
WARN_ON(!sg);
do {
int cpu, max_cpu = -1;
int cpu, cores = 0, max_cpu = -1;
sg->group_weight = cpumask_weight(sched_group_span(sg));
cpumask_copy(mask, sched_group_span(sg));
for_each_cpu(cpu, mask) {
cores++;
#ifdef CONFIG_SCHED_SMT
cpumask_andnot(mask, mask, cpu_smt_mask(cpu));
#endif
}
sg->cores = cores;
if (!(sd->flags & SD_ASYM_PACKING))
goto next;