On Tue, Feb 25, 2025 at 09:24:27PM -0800, Alexei Starovoitov wrote:
> On Fri, Feb 14, 2025 at 12:13 PM Juntong Deng <juntong.deng@xxxxxxxxxxx> wrote:
> > +static int scx_kfunc_ids_ops_context_filter(const struct bpf_prog *prog, u32 kfunc_id)
> > +{
> > + u32 moff, flags;
> > +
> > + if (!btf_id_set8_contains(&scx_kfunc_ids_ops_context, kfunc_id))
> > + return 0;
> > +
> > + if (prog->type == BPF_PROG_TYPE_SYSCALL &&
> > + btf_id_set8_contains(&scx_kfunc_ids_unlocked, kfunc_id))
> > + return 0;
> > +
> > + if (prog->type == BPF_PROG_TYPE_STRUCT_OPS &&
> > + prog->aux->st_ops != &bpf_sched_ext_ops)
> > + return 0;
> > +
> > + /* prog->type == BPF_PROG_TYPE_STRUCT_OPS && prog->aux->st_ops == &bpf_sched_ext_ops*/
> > +
> > + moff = prog->aux->attach_st_ops_member_off;
> > + flags = scx_ops_context_flags[SCX_MOFF_IDX(moff)];
> > +
> > + if ((flags & SCX_OPS_KF_UNLOCKED) &&
> > + btf_id_set8_contains(&scx_kfunc_ids_unlocked, kfunc_id))
> > + return 0;
> > +
> > + if ((flags & SCX_OPS_KF_CPU_RELEASE) &&
> > + btf_id_set8_contains(&scx_kfunc_ids_cpu_release, kfunc_id))
> > + return 0;
> > +
> > + if ((flags & SCX_OPS_KF_DISPATCH) &&
> > + btf_id_set8_contains(&scx_kfunc_ids_dispatch, kfunc_id))
> > + return 0;
> > +
> > + if ((flags & SCX_OPS_KF_ENQUEUE) &&
> > + btf_id_set8_contains(&scx_kfunc_ids_enqueue_dispatch, kfunc_id))
> > + return 0;
> > +
> > + if ((flags & SCX_OPS_KF_SELECT_CPU) &&
> > + btf_id_set8_contains(&scx_kfunc_ids_select_cpu, kfunc_id))
> > + return 0;
> > +
> > + return -EACCES;
> > +}
>
> This looks great.
> Very good cleanup and run-time speed up.
> Please resend without RFC tag, so sched-ext folks can review.
>
> From bpf pov, pls add my Ack to patch 1 when you respin.
> The set can probably target sched-ext tree too.
Thanks for this work Juntong! I'll do a more detailed review later (with
this one or the next patch set without the RFC).
Just a heads up, if you decide to target the sched-ext tree, you may want
to consider sched_ext/for-6.15, since we moved some code around (no big
changes, but some functions are now in ext_idle.c):
https://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git/log/?h=for-6.15
Thanks!
-Andrea
