linux-kernel - Re: [PATCH] perf stat: update POWER9 metrics to utilize other metrics

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Date:   Wed, 26 Aug 2020 22:37:01 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     "Paul A. Clarke" <pc@...ibm.com>
Cc:     kajoljain <kjain@...ux.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        Jiri Olsa <jolsa@...hat.com>, maddy@...ux.ibm.com,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [PATCH] perf stat: update POWER9 metrics to utilize other metrics

On Wed, Aug 26, 2020 at 7:06 PM Paul A. Clarke <pc@...ibm.com> wrote:
>
> On Wed, Aug 26, 2020 at 09:26:40AM -0700, Ian Rogers wrote:
> > On Fri, Aug 14, 2020 at 5:43 AM Arnaldo Carvalho de Melo
> > <acme@...nel.org> wrote:
> > > Em Fri, Aug 14, 2020 at 11:20:42AM +0530, kajoljain escreveu:
> > > > On 8/14/20 9:13 AM, Ian Rogers wrote:
> > > > > On Thu, Aug 13, 2020 at 3:21 PM Paul A. Clarke <pc@...ibm.com> wrote:
> > > > >> These changes take advantage of the new capability added in
> > > > >> merge commit 00e4db51259a5f936fec1424b884f029479d3981
> > > > >> "Allow using computed metrics in calculating other metrics".
> > > > >>
> > > > >> The net is a simplification of the expressions for a handful
> > > > >> of metrics, but no functional change.
> > > > >>
> > > > >> Signed-off-by: Paul A. Clarke <pc@...ibm.com>
> > > >
> > > >   The patch looks good to me.
> > > >
> > > > Reviewed-by: Kajol Jain<kjain@...ux.ibm.com>
> > >
> > > Thanks, applied. Added Ian's Acked-by as well.
> >
> > I've synced perf and testing on a remote machine (not easy for me to
> > log into) I see failures in perf test "10.3: Parsing of PMU event
> > table metrics" like:
> > ...
> > parsing metric: dfu_stall_cpi - dflong_stall_cpi
> > Parse event failed metric 'dfu_other_stall_cpi' id 'dflong_stall_cpi'
> > expr 'dfu_stall_cpi - dflong_stall_cpi'
> > Error string 'parser error' help '(null)'
> > Parse event failed metric 'dfu_other_stall_cpi' id 'dfu_stall_cpi'
> > expr 'dfu_stall_cpi - dflong_stall_cpi'
> > Error string 'parser error' help '(null)'
> > ...
> >
> > This may be that the test doesn't handle the metric in terms of metric
> > addition and so I'll look for a fix. I thought I'd send a heads up in
> > case you had already seen/addressed this. Is perf test on PowerPC
> > clean for you at the moment?
>
> I see these errors as well (on 5.9-rc2).  Each error seems to be for the
> newer metrics that take advantage of the newer functionality, including
> the metrics I changed recently, and Kajol's 24x7 and nest metrics.
>
> Thanks for the heads up!  I confess I had not seen the errors only because
> I wasn't looking.  :-/

No worries, if we create a similar Intel metric it will likely exhibit
a similar issue in the test. Arnaldo and I have wondered about having
an all architectures mode for jevents to make it easier to test cases
like this. As my PowerPC set up is a bit special it is great that
you've confirmed this isn't at fault :-) I'll try to get time to dig a
little further.

Thanks,
Ian

> PC