linux-kernel - Re: Cycles annotation support for perf tools v2

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Date:	Mon, 1 Jun 2015 11:43:58 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Andi Kleen <andi@...stfloor.org>, namhyung@...nel.org,
	eranian@...gle.com, linux-kernel@...r.kernel.org
Subject: Re: Cycles annotation support for perf tools v2

Em Mon, Jun 01, 2015 at 04:21:36PM +0200, Jiri Olsa escreveu:
> On Wed, May 27, 2015 at 10:51:43AM -0700, Andi Kleen wrote:
> > [v2: Addressed review comments. Fixed display problems and 
> > correctly compute IPC now. See patches for detailed changes.]
> > 
> > The upcoming Skylake CPU has a new timed branch stack feature,
> > that reports cycle counts for individual branches in the
> > last branch record.
> > 
> > This allows to get fine grained cost information for code, and also allows
> > to compute fine grained IPC.
> > 
> > Available from
> > git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc.git perf/skl-tools2
> > 
> > This patchkit adds support for this in the perf tools:
> > - Basic support for the cycles field like other branch fields
> > - Show cycles in the standard branch sort view (no IPC here,
> >   as IPC needs the instruction counts from annotation)
> > - Annotate cycles and IPC in the assembler annotate view
> > - Add branch support to top, so we can do live annotation.
> > - Misc support, like dumping it in perf report -D
> 
> v2 seems ok to me.. all my comments were addressed,
> and I posted one more comment
> 
> anyway, I dont touch annotate code that much to ack annotate
> core patches.. acking only portion of the patchset

I took and pushed two of those patches already, will try to look at the
annotation bits later today...

- Arnaldo
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