Re: [PATCH 00/10] perf/uprobe: Optimize uprobes

[Peter Zijlstra]

On Mon, Jul 08, 2024 at 05:25:14PM -0700, Andrii Nakryiko wrote:

> Ramping this up to 16 threads shows that mmap_rwsem is getting more
> costly, up to 45% of CPU. SRCU is also growing a bit slower to 19% of
> CPU. Is this expected? (I'm not familiar with the implementation
> details)

SRCU getting more expensive is a bit unexpected, it's just a per-cpu
inc/dec and a full barrier.

> P.S. Would you be able to rebase your patches on top of latest
> probes/for-next, which include Jiri's sys_uretprobe changes. Right now
> uretprobe benchmarks are quite unrepresentative because of that.

What branch is that? kernel/events/ stuff usually goes through tip, no?