linux-kernel - Re: [PATCH] perf session: Add option to copy events when queueing

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Message-ID: <20131024122748.GC6539@ghostprotocols.net>
Date:	Thu, 24 Oct 2013 09:27:48 -0300
From:	Arnaldo Melo <acme@...stprotocols.net>
To:	David Ahern <dsahern@...il.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
	Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf session: Add option to copy events when queueing

Em Thu, Oct 24, 2013 at 11:23:32AM +0100, David Ahern escreveu:
> On 10/24/13 10:30 AM, Frederic Weisbecker wrote:
> >Bah, checking that again, there don't seem to be a bug there. Actually
> >the sample buffer is reset after we pick the last entry. So it looks
> >all fine. I got confused as usual. Nevermind.
> 
> Ok. I had not come back to this thread since I decided on a
> different route for the event copying. I'll take it out of my to-do
> list.

Can you elaborate on that?

I had this feeling that perhaps we could defer copying the event till it
would be overwritten, something like making a range read only and then
when the event would be _really_ consumed the tooling would mark it as
so... Have to think about it more tho :-\

- Arnaldo
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