Re: Inlining migrate_disable/enable. Was: [PATCH bpf-next v2 02/18] x86,bpf: add bpf_global_caller for global trampoline

[Menglong Dong <menglong8.dong@gmail.com>]

On Fri, Aug 8, 2025 at 8:58 AM Alexei Starovoitov
<alexei.starovoitov@gmail.com> wrote:
>
[......]
> > +{
> > +    DEFINE(RQ_nr_pinned, offsetof(struct rq, nr_pinned));
>
> This part looks nice and sweet. Not sure what you were concerned about.
>
> Respin it as a proper patch targeting tip tree.
>
> And explain the motivation in commit log with detailed
> 'perf report' before/after along with 111M/s to 121M/s speed up,
>
> I suspect with my other __set_cpus_allowed_ptr() suggestion
> the speed up should be even bigger.

Much better.

Before:
fentry         :  113.030 ± 0.149M/s
fentry         :  112.501 ± 0.187M/s
fentry         :  112.828 ± 0.267M/s
fentry         :  115.287 ± 0.241M/s

After:
fentry         :  143.644 ± 0.670M/s
fentry         :  149.764 ± 0.362M/s
fentry         :  149.642 ± 0.156M/s
fentry         :  145.263 ± 0.221M/s
fentry         :  145.558 ± 0.145M/s

>
> > +    return 0;
> > +}