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

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Date:	Sat, 27 Feb 2016 00:13:11 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH 4/5] perf report: Fix dynamic entry display in hierarchy

On Sat, Feb 27, 2016 at 12:12:08AM +0100, Jiri Olsa wrote:
> 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@...nel.org> 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

heh, wrong thread.. sry ;-)

jirka