On Tue, 9 Jul 2024 11:03:04 +0200 Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > 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? I'm handling uprobe patches in linux-trace tree, because it's a kind of probes in the kernel. Actually that is not clarified that the uprobe is handled by which tree. I had asked to handle kprobes in linux-trace, but uprobes might not be clear. Is that OK for you to handle uprobes on linux-trace? Thank you, -- Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
