From: David Ahern <dsahern@gmail.com>
To: Joseph Schuchart <joseph.schuchart@tu-dresden.de>,
Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
thomas.ilsche@tu-dresden.de, linux-kernel@vger.kernel.org,
Fr??d??ric Weisbecker <fweisbec@gmail.com>
Subject: Re: [PATCH] Perf: Correct Assumptions about Sample Timestamps in Passes
Date: Fri, 20 Dec 2013 10:09:53 -0700 [thread overview]
Message-ID: <52B479E1.7020204@gmail.com> (raw)
In-Reply-To: <52B437AA.4090102@tu-dresden.de>
On 12/20/13, 5:27 AM, Joseph Schuchart wrote:
> I know this comes late, but: As far as I can see, your change does not
> preserve the logic of the code I suggested. The idea was to first gather
> all the maximum timestamps of all cpus (that is, the last timestamp seen
> on each cpu) and then determine the minimum of these maxima. These are
> two distinct steps that I think cannot be combined in one update. Your
A number of people have reported similar problems -- timestamps below
last flush time. This approach would solve that problem for data
processed from files, so it would be a good improvement.
David
next prev parent reply other threads:[~2013-12-20 17:09 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-14 8:07 Joseph Schuchart
2013-11-14 8:39 ` Ingo Molnar
2013-11-14 8:59 ` Joseph Schuchart
2013-11-14 10:05 ` Ingo Molnar
2013-11-14 14:26 ` David Ahern
2013-11-14 14:44 ` Peter Zijlstra
2013-11-14 15:02 ` David Ahern
2013-11-14 15:25 ` Peter Zijlstra
2013-11-21 14:55 ` Joseph Schuchart
2013-11-27 13:51 ` Ingo Molnar
2013-12-20 12:27 ` Joseph Schuchart
2013-12-20 17:09 ` David Ahern [this message]
2013-12-23 13:10 ` Frederic Weisbecker
2013-12-23 14:44 ` David Ahern
2013-12-26 15:14 ` Frederic Weisbecker
2013-12-26 15:24 ` David Ahern
2013-12-26 15:30 ` Frederic Weisbecker
2014-01-01 18:37 ` David Ahern
2014-01-03 22:07 ` Frederic Weisbecker
2014-01-03 22:45 ` David Ahern
2014-01-04 15:05 ` Frederic Weisbecker
2014-01-08 21:48 ` David Ahern
2014-01-09 15:19 ` Frederic Weisbecker
2014-01-12 15:46 ` David Ahern
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