linux-kernel - Re: Add top down metrics to perf stat

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Message-ID: <20160327112759.GE4015@krava.sund.root.ku.dk>
Date:	Sun, 27 Mar 2016 13:27:59 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, peterz@...radead.org, jolsa@...nel.org,
	eranian@...gle.com, mingo@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: Add top down metrics to perf stat

On Tue, Mar 22, 2016 at 04:08:46PM -0700, Andi Kleen wrote:

SNIP

> In this case perf stat automatically enables --per-core mode and also requires
> global mode (-a) and avoiding other filters (no cgroup mode)
> 
> When Hyper Threading is off this can be overriden with the --single-thread
> option. When Hyper Threading is on it is enforced, the only way to
> not require -a here is to off line the logical CPUs of the second
> threads.
> 
> One side effect is that this may require root rights or a
> kernel.perf_event_paranoid=-1 setting. 
> 
> Full tree available in 
> git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc perf/top-down-16
> 

can't see this one (-16):

[jolsa@...va perf]$ git remote update ak
Fetching ak
[jolsa@...va perf]$ git branch -r | grep top-down
  ak/perf/top-down-10
  ak/perf/top-down-11
  ak/perf/top-down-13
  ak/perf/top-down-2

thanks,
jirka