linux-kernel - Re: [PATCH v1 07/11] x86: perf: intel

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Date:	Mon, 17 Feb 2014 15:46:17 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH v1 07/11] x86: perf: intel_pt: Intel PT PMU driver

On Thu, Feb 06, 2014 at 12:50:30PM +0200, Alexander Shishkin wrote:
> Add support for Intel Processor Trace (PT) to kernel's perf/itrace events.
> PT is an extension of Intel Architecture that collects information about
> software execuction such as control flow, execution modes and timings and
> formats it into highly compressed binary packets. Even being compressed,
> these packets are generated at hundreds of megabytes per second per core,
> which makes it impractical to decode them on the fly in the kernel. Thus,
> buffers containing this binary stream are zero-copy mapped to the debug
> tools in userspace for subsequent decoding and analysis.
> 
> Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> ---
>  arch/x86/include/uapi/asm/msr-index.h     |  18 +
>  arch/x86/kernel/cpu/Makefile              |   1 +
>  arch/x86/kernel/cpu/intel_pt.h            | 127 ++++
>  arch/x86/kernel/cpu/perf_event.c          |   4 +
>  arch/x86/kernel/cpu/perf_event_intel.c    |  10 +
>  arch/x86/kernel/cpu/perf_event_intel_pt.c | 991 ++++++++++++++++++++++++++++++
>  6 files changed, 1151 insertions(+)
>  create mode 100644 arch/x86/kernel/cpu/intel_pt.h
>  create mode 100644 arch/x86/kernel/cpu/perf_event_intel_pt.c

Andi said that when itrace is enabled the LBR is wrecked; this patch
seems to fail to deal with that.
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