Re: [PATCH 4/5] perf report: Fix dynamic entry display in hierarchy

[Jiri Olsa]

On Fri, Feb 26, 2016 at 07:37:05PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Fri, Feb 26, 2016 at 05:26:02PM -0500, Steven Rostedt escreveu:
> > On Fri, 26 Feb 2016 19:08:19 -0300
> > Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> wrote:
> > 
> > 
> > > It is exploding at this depth, not liking how gfp_flags is described, problem
> > > seems to be in this function, this __print_flags() long thing.
> > > 
> > > Steven, does this look familiar?
> > > 
> > >
> > 
> > Hmm, trace-cmd has the same issue. I just having noticed.
> > 
> > I'll see if I can fix it.
> 
> Ok, this works well with an RHEL kernel being tested with tons of perf
> backports by Jiri, its just with 4.5-rc kernels that this is exploding.

thanks, I isolated this down to the:
  156174999dd1 perf/intel/x86: Enlarge the PEBS buffer

it's related to the FREERUNNING PEBS patchset that allows
store more than 1 event in PEBS buffer

seems like Core CPU doesn't like the default setup and
delays in msr access, which makes the watchdog scream

jirka