linux-kernel - Re: [PATCH 06/12] perf/x86-ibs: Precise event sampling with IBS for AMD CPUs

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: <1335177409.28150.115.camel@twins>
Date:	Mon, 23 Apr 2012 12:36:49 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Robert Richter <robert.richter@....com>
Cc:	Ingo Molnar <mingo@...e.hu>, Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/12] perf/x86-ibs: Precise event sampling with IBS for
 AMD CPUs

On Mon, 2012-04-23 at 10:41 +0200, Robert Richter wrote:
> On 14.04.12 12:22:10, Peter Zijlstra wrote:
> > On Mon, 2012-04-02 at 20:19 +0200, Robert Richter wrote:
> > > + * IbsOpCntCtl (bit 19) of IBS Execution Control Register (IbsOpCtl,
> > > + * MSRC001_1033) is used to select either cycle or micro-ops counting
> > > + * mode. 
> > 
> > Ah is that what it does.. the BKDG doesn't appear to say this.
> 
> "19 IbsOpCntCtl: periodic op counter count control. Revision B:
>     Reserved. Revision C: Read-write. Reset 0b. 1=Count dispatched ops
>     0=Count clock cycles."
> 
> It's here:
> 
>  MSRC001_1033 IBS Execution Control Register (IbsOpCtl)
>  http://support.amd.com/us/Processor_TechDocs/31116.pdf
> 
> Ok, it might not be quite clear that "dispatched ops" is related to
> EventSelect 0C1h Retired uops, but there is an exact mapping.

Ah, looks like my docs are stale.. my fam10 doc didn't have it specified
at all and my fam12 doc just listed the bit 19 as "periodic op counter
count control. Read-write." Which isn't very helpful.

Thanks!
--
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/