Commit d24cb0d9 authored by Tim C Chen's avatar Tim C Chen Committed by Peter Zijlstra
Browse files

sched/topology: Record number of cores in sched group 



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: default avatarTim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/04641eeb0e95c21224352f5743ecb93dfac44654.1688770494.git.tim.c.chen@linux.intel.com
parent fee1759e

kernel/sched/sched.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

kernel/sched/topology.c

+11 −1
Original line number Diff line number Diff line
@@ -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;