linux-kernel - Re: [RFCv2] perf: proposed perf_event

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Message-ID: <20121106231519.GH3430@ghostprotocols.net>
Date:	Tue, 6 Nov 2012 20:15:19 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	linux-man@...r.kernel.org, linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Stephane Eranian <eranian@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [RFCv2] perf: proposed perf_event_open() manpage

Em Tue, Nov 06, 2012 at 05:53:27PM -0500, Vince Weaver escreveu:
> .TP
> .IR "mmap"
> The
> .I mmap
> bit enables recording of extra information to a
> mmap'd ring-buffer.
> This is
> described below in subsection MMAP Layout.

Enables the recording of exec mmap events, its counterpart, for data
maps is...

> .IR "mmap_data" " (Since Linux 2.6.36)"
> Include mmap events in the ring_buffer.

That will include mmap events for data maps.
 
> .TP
> .IR "sample_id_all" " (Since Linux 2.6.38)"
> If set, then all sample ID info (TID, TIME, ID, CPU, STREAM_ID)
> will be provided.

No, it will obey sample_type for non SAMPLE PERF_RECORD_ events,
so if you want timestamps in all events so that you can detect
reordering, use it a sample_type with PERF_SAMPLE_TIME and
sample_id_all.
 
I'll read it again tomorrow, thanks for writing it!

- Arnaldo
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