linux-kernel - Re: [GIT PULL 0/8] perf/pt -> Intel PT/BTS

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Date:	Thu, 2 Jul 2015 11:28:23 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...hat.com>,
	David Ahern <dsahern@...il.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [GIT PULL 0/8] perf/pt -> Intel PT/BTS


* Adrian Hunter <adrian.hunter@...el.com> wrote:

> I am going to need to know what hardware it is and cpu feature flags i.e.
> /proc/cpuinfo
> 
> Also ls /sys/bus/event_source/devices

Sorry about the delay, the merge window is busier than usual ...

So I tried it on:

  1) Intel box, old kernel, new tools: threw an error
  2)   AMD box, new kernel, new tools: threw an error
  3)   AMD box, old kernel, new tools: threw an error

failure was expected in all 3 cases, but it threw the exact same error with no 
real indication about what the problem was, while the real problem was different 
for each case:

  1)  good CPU,  bad kernel
  2)   bad CPU, good kernel
  3)   bad CPU,  bad kernel

I'd expect the 'good CPU, good kernel' combination to work:

  4) Intel box, new kernel, new tools

... but haven't tried it yet.

Thanks,

	Ingo
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