linux-kernel - Re: [PATCHv3 00/19] perf tools: Factor ordered samples queue

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Date:	Thu, 24 Jul 2014 17:20:56 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	David Ahern <dsahern@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Andi Kleen <andi@...stfloor.org>, Jiri Olsa <jolsa@...nel.org>,
	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Jean Pihet <jean.pihet@...aro.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCHv3 00/19] perf tools: Factor ordered samples queue

On Thu, Jul 24, 2014 at 12:10:09PM -0300, Arnaldo Carvalho de Melo wrote:

SNIP

> > 
> > should be good to go..
> > 
> > Namhyung pointed out performance implications for patch 17:
> >   perf tools: Always force PERF_RECORD_FINISHED_ROUND event
> 
> I haven't seen this comment, just saw David, IIUC, having problems using
> the whole patchkit, David?
> 
> My tests were more to counter what he said, i.e. that:
> 
> <quote David Ahern>
> No overload condition, no dropped chunks message - yet can't process
> events
> </>
> 
> I see no overload condition, no dropped chunks message, I was pounding
> the machine with a big load and could process the events, so all seems
> well.
> 
> And from the discussion I understood that patch 17 is the most important
> one, agreed by you and Adrian, right?

yes, it drives the flush (in report) to happen

Namhyung pointed out, that now we store extra event for
non-tracepoint events sessions.. which might have performance
implications:

  http://marc.info/?l=linux-kernel&m=140266032913387&w=2


> 
> I.e. the other ones are refactorings to make it have better naming and
> to allow it being used elsewhere (builtin-trace.c, whee), but still need
> some more polishing/testing, is that right?

correct.. I plan to polish the debug output patchset,
I dont think I've got comments for the rest

jirka
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