linux-kernel - Re: [RFC][PATCH 2/6] perf, arch: Rework perf_event

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: <20111122121422.GN20518@mudshark.cambridge.arm.com>
Date:	Tue, 22 Nov 2011 12:14:22 +0000
From:	Will Deacon <will.deacon@....com>
To:	Oleg Strikov <OSTRIKOV@...dia.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"mingo@...e.hu" <mingo@...e.hu>, William Cohen <wcohen@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Michael Cree <mcree@...on.net.nz>,
	Deng-Cheng Zhu <dengcheng.zhu@...il.com>,
	Anton Blanchard <anton@...ba.org>,
	Eric B Munson <emunson@...bm.net>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	"David S. Miller" <davem@...emloft.net>,
	Richard Kuo <rkuo@...eaurora.org>,
	Stephane Eranian <eranian@...gle.com>,
	Arun Sharma <asharma@...com>, Vince Weaver <vince@...ter.net>
Subject: Re: [RFC][PATCH 2/6] perf, arch: Rework perf_event_index()

On Tue, Nov 22, 2011 at 12:00:33PM +0000, Oleg Strikov wrote:
> Also, please do not forget that enabling the userspace access to the counters may not only create some problems
> to the profilers like Perf/OProfile but could also trash the kernel with the interrupts.

Actually, the registers for controlling interrupts aren't visible to
userspace with ARMv7. On ARMv6, this is a different story, which is why I
didn't mention doing this for older platforms earlier :)

Anyway, this thread has digressed now so you can always jump onto the ARM
list (linux-arm-kernel) if you want to discuss this more.

Cheers,

Will
--
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/