From: Stephane Eranian <eranian@google.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Paul Mackerras <paulus@samba.org>,
mingo@elte.hu, linux-kernel@vger.kernel.org,
robert.richter@amd.com, fweisbec@gmail.com,
Arnaldo Carvalho de Melo <acme@infradead.org>
Subject: Re: [PATCH 06/14] perf, x86: PEBS infrastructure
Date: Fri, 5 Mar 2010 11:51:32 -0800 [thread overview]
Message-ID: <bd4cb8901003051151s795839ddq67640fc9ad73c7bd@mail.gmail.com> (raw)
In-Reply-To: <1267817979.4942.9.camel@laptop>
On Fri, Mar 5, 2010 at 11:39 AM, Peter Zijlstra <peterz@infradead.org> wrote:
> On Fri, 2010-03-05 at 11:11 -0800, Stephane Eranian wrote:
>> By rewinding you get the IP of the instruction that caused the event. But the
>> register state is STILL reflecting the situation at retirement of that
>> instruction.
>
> I'm quite aware of that, but its near impossible to reverse interpret
> instructions such as "mov rdx, $rdx", so until we get fault like PEBS
> we'll just have to live with this.
>
I am sure you are, but that's not necessarily true of everybody.
So this needs to be clearly spelled out in some documentation
about precise + your MISC_EXACT bit.
next prev parent reply other threads:[~2010-03-05 19:51 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-04 14:00 [PATCH 00/14] PEBS and LBR support Peter Zijlstra
2010-03-04 14:00 ` [PATCH 01/14] perf, x86: Remove superfluous arguments to x86_perf_event_set_period() Peter Zijlstra
2010-03-10 13:10 ` [tip:perf/urgent] " tip-bot for Peter Zijlstra
2010-03-04 14:00 ` [PATCH 02/14] perf, x86: Remove superfluous arguments to x86_perf_event_update() Peter Zijlstra
2010-03-10 13:11 ` [tip:perf/urgent] " tip-bot for Peter Zijlstra
2010-03-04 14:00 ` [PATCH 03/14] perf, x86: Change x86_pmu.{enable,disable} calling convention Peter Zijlstra
2010-03-10 13:11 ` [tip:perf/urgent] " tip-bot for Peter Zijlstra
2010-03-04 14:00 ` [PATCH 04/14] perf, x86: Use unlocked bitops Peter Zijlstra
2010-03-10 13:11 ` [tip:perf/urgent] " tip-bot for Peter Zijlstra
2010-03-04 14:00 ` [PATCH 05/14] perf: Generic perf_sample_data initialization Peter Zijlstra
2010-03-10 13:09 ` [tip:perf/urgent] perf: Provide generic " tip-bot for Peter Zijlstra
2010-03-04 14:00 ` [PATCH 06/14] perf, x86: PEBS infrastructure Peter Zijlstra
2010-03-05 6:19 ` Paul Mackerras
2010-03-05 9:20 ` Peter Zijlstra
2010-03-05 19:11 ` Stephane Eranian
2010-03-05 19:39 ` Peter Zijlstra
2010-03-05 19:51 ` Stephane Eranian [this message]
2010-03-10 13:18 ` [tip:perf/pebs] perf, x86: Add " tip-bot for Peter Zijlstra
2010-03-04 14:00 ` [PATCH 07/14] perf: Add attr->precise support to raw event parsing Peter Zijlstra
2010-03-10 13:18 ` [tip:perf/pebs] " tip-bot for Peter Zijlstra
2010-03-04 14:00 ` [PATCH 08/14] perf, x86: Implement simple LBR support Peter Zijlstra
2010-03-10 13:19 ` [tip:perf/pebs] " tip-bot for Peter Zijlstra
2010-03-04 14:00 ` [PATCH 09/14] perf, x86: use LBR for PEBS IP+1 fixup Peter Zijlstra
2010-03-04 16:21 ` Masami Hiramatsu
2010-03-04 17:54 ` Peter Zijlstra
2010-03-04 20:54 ` Masami Hiramatsu
2010-03-04 20:58 ` Masami Hiramatsu
2010-03-04 21:08 ` Peter Zijlstra
2010-03-10 13:19 ` [tip:perf/pebs] " tip-bot for Peter Zijlstra
2010-03-04 14:00 ` [PATCH 10/14] perf-top: Show the percentage of successfull PEBS-fixups Peter Zijlstra
2010-03-10 13:19 ` [tip:perf/pebs] " tip-bot for Peter Zijlstra
2010-03-04 14:00 ` [PATCH 11/14] perf, x86: Clean up IA32_PERF_CAPABILITIES usage Peter Zijlstra
2010-03-10 13:20 ` [tip:perf/pebs] " tip-bot for Peter Zijlstra
2010-03-04 14:00 ` [PATCH 12/14] perf, x86: Expose the full PEBS record using PERF_SAMPLE_RAW Peter Zijlstra
2010-03-10 13:20 ` [tip:perf/pebs] " tip-bot for Peter Zijlstra
2010-03-04 14:00 ` [PATCH 13/14] x86: Move MAX_INSN_SIZE into asm/insn.h Peter Zijlstra
2010-03-04 15:30 ` Masami Hiramatsu
2010-03-10 13:20 ` [tip:perf/pebs] " tip-bot for Peter Zijlstra
2010-03-04 14:01 ` [PATCH 14/14] perf, x86: Implement PERF_SAMPLE_BRANCH_STACK Peter Zijlstra
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