linux-kernel - Re: [PATCHv2 00/18] perf tools: Factor ordered samples queue

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Message-ID: <20140620071549.GA1218@krava.brq.redhat.com>
Date:	Fri, 20 Jun 2014 09:15:49 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	David Ahern <dsahern@...il.com>
Cc:	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...nel.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: [PATCHv2 00/18] perf tools: Factor ordered samples queue

On Thu, Jun 19, 2014 at 11:54:40AM -0600, David Ahern wrote:
> On 6/19/14, 4:34 AM, Jiri Olsa wrote:
> >>I've skimmed through the patches. What happens if you are in the middle of a
> >>round and the max queue size is reached?
> >
> >half of the queue (time half) is flushed to make some free space
> 
> right, I believe there will be scenarios where that will cause failures with
> out of order timestamps.

yep, but I did not hit any so far.. thats why I added
patch 18 - not to drop out of seq. event if it's found
after this flush

jirka
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