linux-kernel - Re: [PATCH] perf, x86: Enabled PEBS event to be exported in a raw format

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Tue, 03 Jul 2012 11:15:05 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Michael Ellerman <michael@...erman.id.au>
Cc:	Feng Tang <feng.tang@...el.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	x86@...nel.org, Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf, x86: Enabled PEBS event to be exported in a raw
 format

On Tue, 2012-07-03 at 17:36 +1000, Michael Ellerman wrote:
> On Fri, 2012-06-29 at 00:00 +0800, Feng Tang wrote:
> > From: Andi Kleen <ak@...ux.intel.com>
> > 
> > Add support for reporting PEBS records in a raw format that can
> > be then parsed by perf script.
> > 
> > This is roughly similar to the existing AMD IBS support.
> > 
> > This is mainly for advanced users and to experiment with
> > new usages. Widespread PEBS usages are expected to get higher
> > level interfaces over time, like the existing "precise ip" support.
> 
> Hi folks,
> 
> Pardon if I slightly hijack this thread, but we'd like to do something
> similar to this on powerpc.

Do expand. What does exact information does it provide?

> I've been telling people not to use PERF_SAMPLE_RAW because it provides
> no way for the consumer to know what data they're getting, and it's not
> extensible in any way.
> 
> So is shovelling things out using PERF_SAMPLE_RAW generally acceptable
> for "advanced usage" scenarios?

No.
--
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/