linux-kernel - Re: [RFC PATCHv3] perf tools: add event grouping capability to "perf stat"

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1290666760.2072.539.camel@laptop>
Date:	Thu, 25 Nov 2010 07:32:40 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc:	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Julia Lawall <julia@...u.dk>, Tom Zanussi <tzanussi@...il.com>,
	linux-kernel@...r.kernel.org, Matt Fleming <matt@...sole-pimps.org>
Subject: Re: [RFC PATCHv3] perf tools: add event grouping capability to
 "perf stat"

On Wed, 2010-11-24 at 17:54 -0800, Corey Ashford wrote:
> Add the ability to create multiple event groups, each with their own leader
> using the existing "-e <event>[,<event> ...] [-e <event>[,<event>]]"
> syntax.  Each additional -e switch creates a new group, and each event
> listed within a -e switch is within that group.
> 
> Changes since v1:
> - Because of a flub, v2 did not contain the changes I had intended to make,
> and instead, v2 had the same patch contents as v1.
> - When perf stat is not supplied any events on the command line, put
> each default event in its own group.

I like this, but could you also extend this to perf-record? its a bit
odd to diverge between the two.

Using Stephane's latest syntax changes you could actually do something
like:

perf record -e task-clock:freq=1000,cycles:period=0

Which would create a group with 1 sampling counter and a counting
counter (at which point we should probably start flipping
PERF_SAMPLE_READ).

Matt was working on supporting that (although not through cmdline
syntax) and teaching perf-report to cope with such output.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/