From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Vince Weaver <vince@deater.net>
Cc: Vince Weaver <vweaver1@eecs.utk.edu>,
mingo@elte.hu, William Cohen <wcohen@redhat.com>,
Stephane Eranian <eranian@google.com>,
Arun Sharma <asharma@fb.com>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC][PATCH 0/6] perf: x86 RDPMC and RDTSC support
Date: Wed, 21 Dec 2011 22:41:07 +0100 [thread overview]
Message-ID: <1324503667.17070.7.camel@twins> (raw)
In-Reply-To: <alpine.DEB.2.02.1112211622560.16411@pianoman.cluster.toy>
On Wed, 2011-12-21 at 16:32 -0500, Vince Weaver wrote:
> * One, is it possible to detect at runtime that rdpmc() is supported?
> Maybe a field in the mmap'd buffer that can be read?
Ingo suggested a similar thing, will implement (although Christmas might
interfere with delivery timelines etc..).
> * Second, if I try a start / run 100M instructions / read
> and measure retired instructions I get:
> 281474977711543 instructions
> This is 0x10000000f45b7 which is 1<<48 + 100M. I guess an artifact
> of how the counters are set up? Is it possible to have this start
> at 0?
Its supposed to be 0 based, clearly I messed up something and need to go
figure out what. Thanks for reporting.
next prev parent reply other threads:[~2011-12-21 21:41 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
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 [this message]
2011-12-21 22:19 ` Vince Weaver
2011-12-21 22:32 ` Peter Zijlstra
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