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sched: Add a new function to compare if two cpus have the same capacity

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The new helper function is needed to help blk-mq check if it needs to
dispatch the softirq on another CPU to match the performance level the
IO requester is running at. This is important on HMP systems where not
all CPUs have the same compute capacity.

Signed-off-by: Qais Yousef <qyousef@layalina.io>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240223155749.2958009-2-qyousef@layalina.io
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Qais Yousef 2024-02-23 15:57:48 +00:00 committed by Jens Axboe
parent 8a08c5fd89
commit b361c9027b
2 changed files with 17 additions and 0 deletions
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6
include/linux/sched/topology.h
View File

@ -176,6 +176,7 @@ extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
bool cpus_equal_capacity(int this_cpu, int that_cpu);
bool cpus_share_cache(int this_cpu, int that_cpu);
bool cpus_share_resources(int this_cpu, int that_cpu);
@ -226,6 +227,11 @@ partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
{
}
static inline bool cpus_equal_capacity(int this_cpu, int that_cpu)
{
return true;
}
static inline bool cpus_share_cache(int this_cpu, int that_cpu)
{
return true;

11
kernel/sched/core.c
View File

@ -3955,6 +3955,17 @@ void wake_up_if_idle(int cpu)
}
}
bool cpus_equal_capacity(int this_cpu, int that_cpu)
{
if (!sched_asym_cpucap_active())
return true;
if (this_cpu == that_cpu)
return true;
return arch_scale_cpu_capacity(this_cpu) == arch_scale_cpu_capacity(that_cpu);
}
bool cpus_share_cache(int this_cpu, int that_cpu)
{
if (this_cpu == that_cpu)