linux-kernel - Re: [PATCH v2 14/16] perf tools: add new mem command for memory access profiling

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Message-ID: <20121106165119.GC13629@infradead.org>
Date:	Tue, 6 Nov 2012 13:51:19 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH v2 14/16] perf tools: add new mem command for memory
 access profiling

Em Tue, Nov 06, 2012 at 04:49:26PM +0100, Stephane Eranian escreveu:
> On Tue, Nov 6, 2012 at 4:44 PM, Arnaldo Carvalho de Melo
> <acme@...hat.com> wrote:
> > Em Mon, Nov 05, 2012 at 02:51:01PM +0100, Stephane Eranian escreveu:
> >> +
> >> +     if (strcmp(mem_operation, MEM_OPERATION_LOAD))
> >> +             sprintf(event, "cpu/mem-stores/pp");
> >> +     else
> >> +             sprintf(event, "cpu/mem-loads/pp");

> > Fails for me on a Sandy Bridge notebook:

> That's because you need to update the microcode.

> $ sudo modprobe microcode
> $ cat /proc/cpuinfo
> 
> Line with microcode needs to say:
> microcode : 0x28

Here it says:

microcode	: 0x25
 
> update the microcode package or install directly from
> intel download center.

Thanks for the info, will do. And they will add "microcode hints for
selected processors should give that info to the user" to my TODO list
:-)

- Arnaldo
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