From: Peter Zijlstra <peterz@infradead.org>
To: Stephane Eranian <eranian@google.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>,
Ingo Molnar <mingo@redhat.com>, Namhyung Kim <namhyung@gmail.com>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
Paul Mackerras <paulus@samba.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] perf, x86: Make cycles:p working on SNB
Date: Thu, 24 May 2012 10:07:53 +0200 [thread overview]
Message-ID: <1337846873.9783.66.camel@laptop> (raw)
In-Reply-To: <CABPqkBQDpoQChAB_GmhuGStPEdjGUVkAg5cE=zH143L9u8pN-A@mail.gmail.com>
On Thu, 2012-05-24 at 10:00 +0200, Stephane Eranian wrote:
> On Thu, May 24, 2012 at 9:57 AM, Peter Zijlstra <peterz@infradead.org> wrote:
> > On Thu, 2012-05-24 at 09:52 +0200, Peter Zijlstra wrote:
> >>
> >> OK, so how about I queue the below and if the u-code updates gets
> >> released before this hits Linus' tree we'll make it all go away ;-)
> >>
> > Also, I suspect the u-code update might make INST_RETIRED.ANY_P
> > available on SNB again voiding the need to use a different encoding. But
> > we'll cross that bridge when we'll get to it.
>
> The PREC_DIST is by design, it is not a work-around of any sort.
> It is an attempt at getting a better distribution of samples when sampling
> with inst_retired.
Oh completely agreed, note that my patch used UOPS_RETIRED.ALL. Only
Namhyung used PREC_DIST, mostly I suspect because he's not stared at all
these manuals for long yet ;-)
next prev parent reply other threads:[~2012-05-24 8:08 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-24 3:02 [PATCH] perf, x86: Make cycles:p working on SNB Namhyung Kim
2012-05-24 7:27 ` Peter Zijlstra
2012-05-24 7:41 ` Stephane Eranian
2012-05-24 7:52 ` Peter Zijlstra
2012-05-24 7:57 ` Peter Zijlstra
2012-05-24 8:00 ` Stephane Eranian
2012-05-24 8:07 ` Peter Zijlstra [this message]
2012-05-24 8:59 ` Stephane Eranian
2012-05-24 9:01 ` Namhyung Kim
2012-05-24 7:58 ` Stephane Eranian
2012-05-30 12:16 ` Peter Zijlstra
2012-06-01 7:44 ` Stephane Eranian
2012-05-24 8:59 ` Namhyung Kim
2012-05-24 9:06 ` Stephane Eranian
2012-05-24 8:53 ` Namhyung Kim
2012-05-24 8:59 ` Stephane Eranian
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