On Tue, Jul 09, 2024 at 12:01:03PM +0200, Jiri Olsa wrote: > On Tue, Jul 09, 2024 at 11:03:04AM +0200, Peter Zijlstra 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? > > it went through the trace tree: > > https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git probes/for-next > > and it's in linux-next/master already FFS :-/ That touches all sorts and doesn't have any perf ack on. Masami what gives?
