Re: [PATCH v3 1/4] LoongArch: Move CONFIG_HAVE_SETUP_PER_CPU_AREA related code to smp.c

[Tiezhu Yang]

On 04/12/2024 12:12 PM, Huacai Chen wrote:
> On Thu, Apr 11, 2024 at 9:05 AM Tiezhu Yang <yangtiezhu@xxxxxxxxxxx> wrote:
> > Currently, if CONFIG_NUMA is not set but CONFIG_SMP is set, the arch
> > specified setup_per_cpu_areas() in arch/loongarch/kernel/numa.c will
> > not be built and the generic setup_per_cpu_areas() in mm/percpu.c is
> > actually used, this is not reasonable and does not work as intended.
> Why is the generic version not reasonable? We need a custom version
> just because it can put the percpu variable in the best node. If NUMA
> disabled, software can only see one node, how to optimize?

The initial aim is to use the arch specific setup_per_cpu_areas()
in any case under CONFIG_SMP, this patch can be dropped if it is
meaningless for the case of !CONFIG_NUMA and CONFIG_SMP.

Thanks,
Tiezhu