linux-kernel - Re: [PATCH 1/2] perf-events: Add support for supplementary event registers v2

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: <20101113101148.GB6418@gargoyle.fritz.box>
Date:	Sat, 13 Nov 2010 11:13:03 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	eranian@...gle.com, linux-kernel@...r.kernel.org,
	cjashfor@...ux.vnet.ibm.com, mingo@...e.hu, fweisbec@...il.com,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/2] perf-events: Add support for supplementary event
 registers v2

> Hrmm,. this doesn't really scale right wrt multiple extra_regs.
> 
> You made the extra_regs thing fairly extensible, but the above doesn't
> really work well if there's multiple extra regs (say OFFCORE and
> LBR_CONFIG -- possibly even the two OFFCORE regs present on westmere).
> 
> It basically needs a per-core state for each extra_reg possible.

It shouldn't be too hard to extend it to use a table. I didn't want
to do that for the first iteration. I guess it could be done as followons
once LBR is implemented.

-Andi
--
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/