linux-kernel - Re: [PATCH v0 04/71] itrace: Infrastructure for instruction flow tracing units

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Message-ID: <87a9f6ellg.fsf@ashishki-desk.ger.corp.intel.com>
Date:	Wed, 08 Jan 2014 13:53:15 +0200
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v0 04/71] itrace: Infrastructure for instruction flow tracing units

Andi Kleen <andi@...stfloor.org> writes:

>> So create two events, one for the PT stuff and one to track the
>> side-band stuff. We have a NOP event for just this purpose.
>
> Ok I guess that could work.
>
> Essentially replace the magic mmap offset with a second fd.
>
> Alex, what do you think?

Yes, that's what I suggested some time ago in [1]. A second buffer
(through another fd or otherwise) is an essential thing from my point of
view.

[1] http://marc.info/?l=linux-kernel&m=138737306725663

Regards,
--
Alex
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