linux-kernel - Re: [PATCH 3/4] perf-events: Add support for supplementary event registers v3

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: <AANLkTin3K_ffY8SeCo6JK570eDx_zHXzQ6ANA_ixy3tP@mail.gmail.com>
Date:	Mon, 22 Nov 2010 13:47:59 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	Lin Ming <lin@...g.vg>
Cc:	Andi Kleen <andi@...stfloor.org>, a.p.zijlstra@...llo.nl,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 3/4] perf-events: Add support for supplementary event
 registers v3

On Mon, Nov 22, 2010 at 1:23 PM, Lin Ming <lin@...g.vg> wrote:
> On Thu, Nov 18, 2010 at 6:47 PM, Andi Kleen <andi@...stfloor.org> wrote:
>> From: Andi Kleen <ak@...ux.intel.com>
>>
>> Intel Nehalem/Westmere have a special OFFCORE_RESPONSE event
>> that can be used to monitor any offcore accesses from a core.
>> This is a very useful event for various tunings, and it's
>> also needed to implement the generic LLC-* events correctly.
>>
>> Unfortunately this event requires programming a mask in a separate
>> register. And worse this separate register is per core, not per
>> CPU thread.
>
> This "separate register" is MSR_OFFCORE_RSP_0, right?
> But from the SDM,  MSR_OFFCORE_RSP_0 is "thread" scope,
> see SDM 3b, Appendix B.4 MSRS IN THE INTEL® MICROARCHITECTURE CODENAME NEHALEM
>
> Or am I missing some obvious thing?
>
The manual is wrong on this.

> Thanks,
> Lin Ming
>
--
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/