Re: [PATCH] perf parse-events: Move slots only with topdown

[Arnaldo Carvalho de Melo]

Em Tue, Mar 22, 2022 at 07:48:48AM -0400, Liang, Kan escreveu:
> On 3/21/2022 6:33 PM, Ian Rogers wrote:
> > If slots isn't with a topdown event then moving it is unnecessary. For
> > example {instructions, slots} is re-ordered:
> > 
> > $ perf stat -e '{instructions,slots}' -a sleep 1
> > 
> >   Performance counter stats for 'system wide':
> > 
> >         936,600,825      slots
> >         144,440,968      instructions
> > 
> >         1.006061423 seconds time elapsed
> > 
> > Which can break tools expecting the command line order to match the
> > printed order. It is necessary to move the slots event first when it
> > appears with topdown events. Add extra checking so that the slots event
> > is only moved in the case of there being a topdown event like:
> > 
> > $ perf stat -e '{instructions,slots,topdown-fe-bound}' -a sleep 1
> > 
> >   Performance counter stats for 'system wide':
> > 
> >          2427568570      slots
> >           300927614      instructions
> >           551021649      topdown-fe-bound
> > 
> >         1.001771803 seconds time elapsed
> > 
> > Fixes: 94dbfd6781a0 ("perf parse-events: Architecture specific leader override")
> > Reported-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
> > Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
> 
> Thanks Ian. The patch works well.
> 
> Tested-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>

Thanks, applied.

- Arnaldo