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From: Ingo Molnar <mingo@elte.hu>
To: David Miller <davem@davemloft.net>,
	Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: eranian@google.com, peterz@infradead.org,
	linux-kernel@vger.kernel.org, paulus@samba.org,
	robert.richter@amd.com, fweisbec@gmail.com
Subject: Re: [RFC][PATCH 07/11] perf: Provide PERF_SAMPLE_REGS
Date: Thu, 4 Mar 2010 03:59:08 +0100	[thread overview]
Message-ID: <20100304025908.GC23633@elte.hu> (raw)
In-Reply-To: <20100303.095553.105186917.davem@davemloft.net>


* David Miller <davem@davemloft.net> wrote:

> And more generally aren't we supposed to be able to eventually analyze perf 
> dumps on any platform not just the one 'perf' was built under?

A aidenote: in this cycle Arnaldo improved this aspect of perf (and those 
changes are now upstream). In theory you should be able to do a 'perf record' 
+ 'perf archive' on your Sparc box and then analyze it via 'perf report' on an 
x86 box - and vice versa.

( Note, it was not tested in that specific combination - another combination
  was tested by Arnaldo: 32-bit PA-RISC profile interpreted on 64-bit x86. )

So yes, i agree that at minimum perf should be able to tell apart the nature 
of any recording and flag combinations it cannot handle (yet).

Btw, i think the most popular use of PEBS is its precise nature, not the 
register dumping aspect per se. If the kernel can provide that transparently 
then that's a usecase that does not need a register dump (in user-space that 
is). It's borderline doable on x86 ...

Thanks,

	Ingo

  parent reply	other threads:[~2010-03-04  2:59 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-03-03 16:39 [RFC][PATCH 00/11] Another stab at PEBS and LBR support Peter Zijlstra
2010-03-03 16:39 ` [RFC][PATCH 01/11] perf, x86: Remove superfluous arguments to x86_perf_event_set_period() Peter Zijlstra
2010-03-03 16:39 ` [RFC][PATCH 02/11] perf, x86: Remove superfluous arguments to x86_perf_event_update() Peter Zijlstra
2010-03-03 16:39 ` [RFC][PATCH 03/11] perf, x86: Change x86_pmu.{enable,disable} calling convention Peter Zijlstra
2010-03-03 16:39 ` [RFC][PATCH 04/11] perf, x86: Use unlocked bitops Peter Zijlstra
2010-03-03 16:39 ` [RFC][PATCH 05/11] perf: Generic perf_sample_data initialization Peter Zijlstra
2010-03-03 16:49   ` David Miller
2010-03-03 21:14   ` Frederic Weisbecker
2010-03-05  8:44   ` Jean Pihet
2010-03-03 16:39 ` [RFC][PATCH 06/11] perf, x86: PEBS infrastructure Peter Zijlstra
2010-03-03 17:38   ` Robert Richter
2010-03-03 17:42     ` Peter Zijlstra
2010-03-04  8:50       ` Robert Richter
2010-03-03 16:39 ` [RFC][PATCH 07/11] perf: Provide PERF_SAMPLE_REGS Peter Zijlstra
2010-03-03 17:30   ` Stephane Eranian
2010-03-03 17:39     ` Peter Zijlstra
2010-03-03 17:49       ` Stephane Eranian
2010-03-03 17:55         ` David Miller
2010-03-03 18:18           ` Stephane Eranian
2010-03-03 19:18           ` Peter Zijlstra
2010-03-04  2:59           ` Ingo Molnar [this message]
2010-03-04 12:58             ` Arnaldo Carvalho de Melo
2010-03-03 22:02   ` Frederic Weisbecker
2010-03-04  8:58     ` Peter Zijlstra
2010-03-04 11:04       ` Ingo Molnar
2010-03-03 16:39 ` [RFC][PATCH 08/11] perf, x86: Implement simple LBR support Peter Zijlstra
2010-03-03 21:52   ` Stephane Eranian
2010-03-04  8:58     ` Peter Zijlstra
2010-03-03 21:57   ` Stephane Eranian
2010-03-04  8:58     ` Peter Zijlstra
2010-03-04 17:54       ` Stephane Eranian
2010-03-04 18:18         ` Peter Zijlstra
2010-03-04 20:23           ` Peter Zijlstra
2010-03-04 20:57             ` Stephane Eranian
2010-03-03 16:39 ` [RFC][PATCH 09/11] perf, x86: Implement PERF_SAMPLE_BRANCH_STACK Peter Zijlstra
2010-03-03 21:08   ` Frederic Weisbecker
2010-03-03 16:39 ` [RFC][PATCH 10/11] perf, x86: use LBR for PEBS IP+1 fixup Peter Zijlstra
2010-03-03 18:05   ` Masami Hiramatsu
2010-03-03 19:37     ` Peter Zijlstra
2010-03-03 21:11       ` Masami Hiramatsu
2010-03-03 21:50         ` Stephane Eranian
2010-03-04  8:57           ` Peter Zijlstra
2010-03-09  1:41             ` Stephane Eranian
2010-03-03 16:39 ` [RFC][PATCH 11/11] perf, x86: Clean up IA32_PERF_CAPABILITIES usage Peter Zijlstra

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