linux-kernel - Re: [PATCH v3 1/4] perf: Add a 'percore' event qualifier

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Date:   Wed, 10 Apr 2019 09:54:31 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     jolsa@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, Linux-kernel@...r.kernel.org,
        ak@...ux.intel.com, kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v3 1/4] perf: Add a 'percore' event qualifier

Em Wed, Apr 10, 2019 at 09:36:41AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Tue, Mar 19, 2019 at 04:56:53PM +0800, Jin Yao escreveu:
> > Add a 'percore' event qualifier, like cpu/event=0,umask=0x3,percore=1/,
> > that sums up the event counts for both hardware threads in a core.
> > 
> > We can already do this with --per-core, but it's often useful to do
> > this together with other metrics that are collected per hardware thread.
> > So we need to support this per-core counting on a event level.
> > 
> > This can be implemented in only the user tool, no kernel support needed.
> > 
> >  v3:
> >  ---
> >  Simplify the code according to Jiri's comments.
> >  Before:
> >    "return term->val.percore ? true : false;"
> >  Now:
> >    "return term->val.percore;"
> > 
> >  v2:
> >  ---
> >  Change the qualifier name from 'coresum' to 'percore' according to
> >  comments from Jiri and Andi.
> 
> I'm applying this, but please, don't forget to, when adding a new
> qualifier, to update the documentation... I'm doing this for you this
> time.

The first patch didn't apply with 'git am', I did it manually, and added
the patch below

But then the second doesn't apply to my perf/core branch as well, please
refresh and resend a v4, thanks.

- Arnaldo

diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentation/perf-list.txt
index 138fb6e94b3c..18ed1b0fceb3 100644
--- a/tools/perf/Documentation/perf-list.txt
+++ b/tools/perf/Documentation/perf-list.txt
@@ -199,6 +199,18 @@ also be supplied. For example:
 
   perf stat -C 0 -e 'hv_gpci/dtbp_ptitc,phys_processor_idx=0x2/' ...
 
+EVENT QUALIFIERS:
+
+It is also possible to add extra qualifiers to an event:
+
+percore:
+
+Sums up the event counts for all hardware threads in a core, e.g.:
+
+
+  perf stat -e cpu/event=0,umask=0x3,percore=1/
+
+
 EVENT GROUPS
 ------------