From mboxrd@z Thu Jan  1 00:00:00 1970
From: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Subject: Re: perf top -z not working?
Date: Mon, 22 Oct 2012 07:45:52 -0700
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To: Ryan Johnson <ryan.johnson@cs.utoronto.ca>
Cc: David Ahern <dsahern@gmail.com>, Chulmin Kim <cmkim@core.kaist.ac.kr>, linux-perf-users@vger.kernel.org

Em Mon, Oct 22, 2012 at 10:10:25AM -0400, Ryan Johnson escreveu:
> On 22/10/2012 9:12 AM, David Ahern wrote:
> >The kernel has nothing to do with the feature. From builtin-top.c,
> >this part is either not happening or more likely not happening
> >correctly.
> >
> >    if (top->zero)
> >        symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx);
> >    else
> >        symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx);
> >
> >I recall it working recently - last year or so. Can you try
> >different versions -- say 3.0, 3.2, 3.4 and latest? If you have a
> >copy of Linus' tree or Arnaldo's git tree it should not take much
> >time.
> Chulmin says his 3.0 version works. My 3.2.18 doesn't. I don't have
> a copy of the git tree on that machine, but I'll try building 3.4.x
> and tip when I get a chance. I have never built perf-tools before,
> though, so I'd appreciate tips on what might be different for
> building perf-tools compared to the kernel, and how to avoid
> building the standard kernel along the way. Hopefully it's just
> configure-make-install?

To build just the tools, on a /usr/src/linux or wherever you have the
newer kernel sources:

 make -C tools/perf install

Then make sure you use what is in your ~/bin/ before the standard path:

 export PATH=~/bin:$PATH
 hash -r

Then try perf top -z again.

- Arnaldo