From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Will Deacon <will.deacon@arm.com>
Cc: "mingo@elte.hu" <mingo@elte.hu>,
William Cohen <wcohen@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Michael Cree <mcree@orcon.net.nz>,
Deng-Cheng Zhu <dengcheng.zhu@gmail.com>,
Anton Blanchard <anton@samba.org>,
Eric B Munson <emunson@mgebm.net>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Paul Mundt <lethal@linux-sh.org>,
"David S. Miller" <davem@davemloft.net>,
Richard Kuo <rkuo@codeaurora.org>,
Stephane Eranian <eranian@google.com>,
Arun Sharma <asharma@fb.com>, Vince Weaver <vince@deater.net>
Subject: Re: [RFC][PATCH 2/6] perf, arch: Rework perf_event_index()
Date: Mon, 21 Nov 2011 21:35:55 +0100 [thread overview]
Message-ID: <1321907755.28118.30.camel@twins> (raw)
In-Reply-To: <20111121203145.GA7301@mudshark.cambridge.arm.com>
On Mon, 2011-11-21 at 20:31 +0000, Will Deacon wrote:
> On Mon, Nov 21, 2011 at 07:18:10PM +0000, Peter Zijlstra wrote:
> > But does ARM have a read PMU counter from userspace
> > instruction/capability?
>
> In ARMv7, you can enable user access to the performance counters but the
> access is R/W so I don't think it's something we want to do (could interfere
> with another task doing system-wide profiling).
Yeah, write access is pushing it a bit..
> > Lacking that its all moot of course. If it does, it would be nice to
> > have an ARM version of patch 6.
>
> Well we'd need a way to get around the all-or-nothing user access to the PMU
> and also the fact that we don't always have a user-readable clocksource.
>
> Either way, the event counters are indexed from 0 on ARMv7 so we should
> use perf_event_idx_default.
Ok, done. Thanks!
next prev parent reply other threads:[~2011-11-21 20:36 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-21 14:51 [RFC][PATCH 0/6] perf: x86 RDPMC and RDTSC support Peter Zijlstra
2011-11-21 14:51 ` [RFC][PATCH 1/6] perf: Update the mmap control page on mmap() Peter Zijlstra
2011-11-21 14:51 ` [RFC][PATCH 2/6] perf, arch: Rework perf_event_index() Peter Zijlstra
2011-11-21 16:22 ` Eric B Munson
2011-11-21 17:23 ` Will Deacon
2011-11-21 19:18 ` Peter Zijlstra
2011-11-21 20:31 ` Will Deacon
2011-11-21 20:35 ` Peter Zijlstra [this message]
2011-11-21 22:43 ` Will Deacon
2011-11-22 11:26 ` Peter Zijlstra
2011-11-22 11:47 ` Will Deacon
2011-11-22 11:49 ` Oleg Strikov
2011-11-22 11:52 ` Will Deacon
2011-11-22 11:56 ` Oleg Strikov
2011-11-22 12:00 ` Oleg Strikov
2011-11-22 12:14 ` Will Deacon
2011-11-22 12:25 ` Oleg Strikov
2011-11-22 11:51 ` Peter Zijlstra
2011-11-22 11:54 ` Will Deacon
2011-11-22 11:48 ` Oleg Strikov
2011-11-21 14:51 ` [RFC][PATCH 3/6] perf, x86: Implement userspace RDPMC Peter Zijlstra
2011-11-21 14:51 ` [RFC][PATCH 4/6] perf, x86: Provide means of disabling " Peter Zijlstra
2011-11-21 14:51 ` [RFC][PATCH 5/6] perf: Extend the mmap control page with time (TSC) fields Peter Zijlstra
2011-12-28 17:55 ` Stephane Eranian
2011-11-21 14:51 ` [RFC][PATCH 6/6] perf, tools: X86 RDPMC, RDTSC test Peter Zijlstra
2011-11-21 15:29 ` Stephane Eranian
2011-11-21 15:37 ` Peter Zijlstra
2011-11-21 16:59 ` Peter Zijlstra
2011-11-21 17:42 ` Stephane Eranian
2011-11-21 15:02 ` [RFC][PATCH 0/6] perf: x86 RDPMC and RDTSC support Vince Weaver
2011-11-21 16:05 ` William Cohen
2011-11-21 16:08 ` William Cohen
2011-12-02 19:26 ` Arun Sharma
2011-12-02 22:22 ` Stephane Eranian
2011-12-05 20:16 ` Arun Sharma
2011-12-05 23:17 ` Arun Sharma
2011-12-06 1:38 ` Stephane Eranian
2011-12-06 9:42 ` Peter Zijlstra
2011-12-06 21:53 ` Arun Sharma
2011-12-16 22:36 ` Vince Weaver
2011-12-21 12:58 ` Peter Zijlstra
2011-12-21 13:15 ` Ingo Molnar
2011-12-23 20:12 ` Vince Weaver
2011-12-21 15:04 ` Vince Weaver
2011-12-21 21:32 ` Vince Weaver
2011-12-21 21:41 ` Peter Zijlstra
2011-12-21 22:19 ` Vince Weaver
2011-12-21 22:32 ` Peter Zijlstra
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