From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
"David S. Ahern" <daahern@cisco.com>,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 1/2] perf tools: Add reference timestamp to perf header
Date: Mon, 13 Dec 2010 19:10:24 +0100 [thread overview]
Message-ID: <1292263824.6803.391.camel@twins> (raw)
In-Reply-To: <20101213180548.GF1691@nowhere>
On Mon, 2010-12-13 at 19:05 +0100, Frederic Weisbecker wrote:
>
> There is one writer per cpu and a (stupid) multiplexing at report time.
> It was working. Just the sorting on report time was (stupidly) slow.
>
> I should perhaps rebase that branch and try to make something with it.
Right, so we need to have a small ~16 events sort window per file [*],
and then a merge-sort over all files, simply consumer the most recent
event across all files.
We can have out-of-order events on a single cpu due to nesting and
taking the time-stamp _before_ we reserve the buffer. We could cure some
of this by moving the perf_clock() call from
__perf_event_header__init_id()/perf_prepare_sample() to
__perf_event_output_id_sample()/perf_output_sample().
next prev parent reply other threads:[~2010-12-13 18:10 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-08 1:54 [PATCH 0/2] perf tools: add reference timestamp and use it in time history dump David Ahern
2010-12-08 1:54 ` [PATCH 1/2] perf tools: Add reference timestamp to perf header David Ahern
2010-12-12 20:16 ` Frederic Weisbecker
2010-12-13 13:15 ` Arnaldo Carvalho de Melo
2010-12-13 16:58 ` Arnaldo Carvalho de Melo
2010-12-13 14:39 ` David S. Ahern
2010-12-13 15:54 ` Frederic Weisbecker
2010-12-13 16:48 ` Arnaldo Carvalho de Melo
2010-12-13 17:09 ` Frederic Weisbecker
2010-12-13 17:11 ` Peter Zijlstra
2010-12-13 17:13 ` Peter Zijlstra
2010-12-13 17:23 ` Frederic Weisbecker
2010-12-13 17:37 ` Peter Zijlstra
2010-12-13 17:50 ` Frederic Weisbecker
2010-12-13 17:15 ` Frederic Weisbecker
2010-12-13 17:18 ` Peter Zijlstra
2010-12-13 17:22 ` Arnaldo Carvalho de Melo
2010-12-13 17:35 ` Peter Zijlstra
2010-12-13 17:43 ` Arnaldo Carvalho de Melo
2010-12-13 17:51 ` Peter Zijlstra
2010-12-13 18:05 ` Frederic Weisbecker
2010-12-13 18:10 ` Peter Zijlstra [this message]
2010-12-13 17:47 ` Peter Zijlstra
2010-12-13 17:49 ` David S. Ahern
2010-12-13 17:57 ` Peter Zijlstra
2010-12-13 18:01 ` David S. Ahern
2010-12-13 18:06 ` Peter Zijlstra
2010-12-13 18:20 ` David S. Ahern
2010-12-13 19:08 ` Arnaldo Carvalho de Melo
2010-12-13 19:15 ` David S. Ahern
2010-12-13 19:22 ` Peter Zijlstra
2010-12-13 19:17 ` Peter Zijlstra
2010-12-13 17:48 ` Peter Zijlstra
2010-12-13 17:14 ` Arnaldo Carvalho de Melo
2010-12-13 17:36 ` David S. Ahern
2010-12-13 17:51 ` Arnaldo Carvalho de Melo
2010-12-08 1:54 ` [PATCH 2/2] perf tools: Add option to show time history of event samples David Ahern
2010-12-08 21:06 ` Arnaldo Carvalho de Melo
2010-12-12 21:32 ` Frederic Weisbecker
2010-12-09 17:18 ` [PATCH 0/2] perf tools: add reference timestamp and use it in time history dump Arnaldo Carvalho de Melo
2010-12-12 21:39 ` Frederic Weisbecker
-- strict thread matches above, loose matches on Subject: below --
2010-11-29 23:07 [PATCH 0/2] perf tools: reference timestamp and " David Ahern
2010-11-29 23:07 ` [PATCH 1/2] perf tools: add reference timestamp to perf header David Ahern
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