Re: [RFC PATCH 2/4] tracing/probes: Compile all fetchargs into a single BPF program per event

[Steven Rostedt]

On Wed, 01 Jul 2026 11:41:26 -0700
"Alexei Starovoitov" <alexei.starovoitov@xxxxxxxxx> wrote:

> Nack.
> I really don't like it.

So the nack is mostly your opinion and not technical?

> There were days in the past when the kernel generating bpf directly was appealing.
> These days are gone. Performance improvements for fetchargs is not a good reason

Why is performance *not* a good reason?

> to add all this complexity and bypass verifier checks.

The code lives in the kernel. What reason is there to add verification
checks? The point of verification is because we don't trust user space. Why
do we not trust the kernel?

> bpf insns should come from user space.

Why?

-- Steve