linux-kernel - Re: [PATCH 1/1] rasd: Use perf_evlist_

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Date:	Fri, 10 Oct 2014 22:28:54 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Jean Pihet <jean.pihet@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Fu Wei <fu.wei@...aro.org>, Robert Richter <rric@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 1/1] rasd: Use perf_evlist__open() instead of open coded

On Fri, Oct 10, 2014 at 05:07:08PM -0300, Arnaldo Carvalho de Melo wrote:
> Ok, so what is now at my perf/hists branch at:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git
> 
> should do the trick, the patch below makes rasd.c use it.

Cool.

> I'll try  lding rasd.c with it and checking if it works.
> 
> Never having tried this, what are the requisites to test it? Some
> specific hardware and a kernel with the right tracepoint? I guess some
> recent 3.17-rc kernel is all that I need?

Well, you'd need the part of Jean's patches which adds the event to evlist:

https://lkml.kernel.org/r/1412933690-25576-1-git-send-email-jean.pihet@linaro.org

AFAICT, you could apply patches 1-5 and replace 6 with yours. Now,
rasd.cfg has the mce:mce_record tracepoint which rasd opens but you
probably want to put a tracepoint which is much easier to exercise,
maybe some syscall or whatever.

I think that should do it but we won't know until we've tried it.

HTH and thanks a lot for doing this!

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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