Subject: Re: [PATCH v2 0/7] Share events between metrics

From: Arnaldo Carvalho de Melo <[email-masked]>
Date: Thu, 21 May 2020 14:22:35 -0300

Em Thu, May 21, 2020 at 01:43:25PM +0200, Jiri Olsa escreveu:
> On Wed, May 20, 2020 at 11:20:04AM -0700, Ian Rogers wrote:
> 
> SNIP
> 
> > There are 5 out of 12 metric groups where no events are shared, such
> > as Power, however, disabling grouping of events always reduces the
> > number of events.
> > 
> > The result for Memory_BW needs explanation:
> > 
> > Metric group: Memory_BW
> >  - No merging (old default, now --metric-no-merge): 9
> >  - Merging over metrics (new default)             : 5
> >  - No event groups and merging (--metric-no-group): 11
> > 
> > Both with and without merging the groups fail to be set up and so the
> > event counts here are for broken metrics. The --metric-no-group number
> > is accurate as all the events are scheduled. Ideally a constraint
> > would be added for these metrics in the json code to avoid grouping.
> > 
> > v2. rebases on kernel/git/acme/linux.git branch tmp.perf/core, fixes a
> > missing comma with metric lists (reported-by Jiri Olsa
> > <[email-masked]>) and adds early returns to metricgroup__add_metric
> > (suggested-by Jiri Olsa).
> 
> Acked-by: Jiri Olsa <[email-masked]>

Applied and pushed to tmp.perf/core, will move to perf/core as soon as
testing finishes,

- Arnaldo