Em Mon, Apr 25, 2016 at 05:44:00PM -0700, Alexei Starovoitov escreveu:
> On Mon, Apr 25, 2016 at 09:29:28PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Mon, Apr 25, 2016 at 05:07:26PM -0700, Alexei Starovoitov escreveu:
> > > > + {
> > > > + .procname = "perf_event_max_stack",
> > > > + .data = NULL, /* filled in by handler */
> > > > + .maxlen = sizeof(sysctl_perf_event_max_stack),
> > > > + .mode = 0644,
> > > > + .proc_handler = perf_event_max_stack_handler,
> > > > + .extra1 = &zero,
> > > > + },
> >
> > > you need to define a max value otherwise perf_callchain_entry__sizeof
> > > will overflow. Sure it's root only facility, but still not nice.
> > > 1M? Anything above 1M stack frames would be insane anyway.
> > > The rest looks good. Thanks!
> >
> > Something else? ;-)
>
> all looks good to me. Thanks a bunch!
Thanks for checking!
> > Because we only allocate the callchain percpu data structures when there
> > is a user, which allows for changing the max easily, its just a matter
> > of having no callchain users at that point.
> >
> > Reported-and-Tested-by: Brendan Gregg <brendan.d.gr...@gmail.com>
> > Acked-by: Alexei Starovoitov <a...@kernel.org>
>
> yep :)
> hopefully Brendan can give it another spin.
Agreed, and I'm calling it a day anyway, Brendan, please consider
retesting, thanks,
- Arnaldo
