On Mon, Jun 20, 2016 at 12:16:22PM -0700, Andy Lutomirski wrote: > On Mon, Jun 20, 2016 at 11:00 AM, Josh Poimboeuf <jpoim...@redhat.com> wrote: > > > > > From: Josh Poimboeuf <jpoim...@redhat.com> > > Subject: [PATCH] perf: add 'perf bench syscall' > > > > Add a basic 'perf bench syscall' benchmark which does a getppid() system > > call in a tight loop. > > > > My one suggestion would be to use a different syscall than getppid(), > as getppid() can have unusual performance characteristics on kernels > with pid namespaces enabled. I'm a fan of prctl(-1, 0, 0, 0, 0).
Hm, can you elaborate on the unusual performance characteristics of getppid()? The code seems pretty minimal. prctl() actually seems much worse to me, because of all the security module cruft. -- Josh
