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sched/balancing: Rename find_idlest_group_cpu() => sched_balance_find_dst_group_cpu()

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Standardize scheduler load-balancing function names on the
sched_balance_() prefix.

Also use 'dst' instead of 'idlest': while historically correct,
today it's not really true anymore that we return the 'idlest'
group or CPU, we sort by idle-exit latency and only return the
idlest CPUs from the lowest-latency set of CPUs.

The true 'idlest' CPUs often remain idle for a long time
and are never returned as long as the system is under-loaded.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Link: https://lore.kernel.org/r/20240308111819.1101550-12-mingo@kernel.org
This commit is contained in:
Ingo Molnar 2024-03-08 12:18:17 +01:00
parent 7d058285cd
commit 646ebaf51c
1 changed files with 3 additions and 3 deletions
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6
kernel/sched/fair.c
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@ -7101,10 +7101,10 @@ static struct sched_group *
find_idlest_group(struct sched_domain *sd, struct task_struct *p, int this_cpu);
/*
* find_idlest_group_cpu - find the idlest CPU among the CPUs in the group.
* sched_balance_find_dst_group_cpu - find the idlest CPU among the CPUs in the group.
*/
static int
find_idlest_group_cpu(struct sched_group *group, struct task_struct *p, int this_cpu)
sched_balance_find_dst_group_cpu(struct sched_group *group, struct task_struct *p, int this_cpu)
{
unsigned long load, min_load = ULONG_MAX;
unsigned int min_exit_latency = UINT_MAX;
@ -7191,7 +7191,7 @@ static inline int find_idlest_cpu(struct sched_domain *sd, struct task_struct *p
continue;
}
new_cpu = find_idlest_group_cpu(group, p, cpu);
new_cpu = sched_balance_find_dst_group_cpu(group, p, cpu);
if (new_cpu == cpu) {
/* Now try balancing at a lower domain level of 'cpu': */
sd = sd->child;