linux-kernel - Re: [PATCH 1/4] perf: Add memory load/store events generic code

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]

Message-ID: <1310138308.3282.708.camel@twins>
Date:	Fri, 08 Jul 2011 17:18:28 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Anton Blanchard <anton@...ba.org>
Cc:	Paul Mackerras <paulus@...ba.org>, Lin Ming <ming.m.lin@...el.com>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] perf: Add memory load/store events generic code

On Fri, 2011-07-08 at 17:18 +1000, Anton Blanchard wrote:
> Hi Peter,
> 
> > The thing we're talking about is Intel PEBS Load Latency/Precise Store
> > and AMD IBS where together with a mem op retired event (mem loads
> > retired for Load-Latency, mem stores retired for Precise Store)
> > provides an additional field describing where the load/store was
> > sourced from.
> > 
> > Such additional data would require the addition of a
> > PERF_SAMPLE_SOURCE field or similar, for some reason or other I was
> > under the impression some of the PPC chips had something similar. But
> > if not, it saves us having to worry about that.
> 
> It does sound a lot like our event vector, where we can have up to
> 64 bits of information that goes with a sample. A lot of the fields
> relate to loads and stores, but there are other fields (eg pipeline
> information at the point the sample was taken).
> 
> So we could definitely use a field to capture this.

Happen to have a ref to some docs about that? We'd want to make sure our
definition is wide enough to also work for ppc.
--
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/