linux-kernel - [PATCH v1 0/4] perf: Fix uncore metric issue

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Date:   Wed, 28 Aug 2019 13:59:28 +0800
From:   Jin Yao <yao.jin@...ux.intel.com>
To:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com
Cc:     Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com,
        Jin Yao <yao.jin@...ux.intel.com>
Subject: [PATCH v1 0/4] perf: Fix uncore metric issue

Some uncore metrics don't work as expected. For example, on cascadelakex,

root@...-csl-2sp2:~# perf stat -M UNC_M_PMM_BANDWIDTH.TOTAL -a -- sleep 1

 Performance counter stats for 'system wide':

           1841092      unc_m_pmm_rpq_inserts
           3680816      unc_m_pmm_wpq_inserts

       1.001775055 seconds time elapsed

root@...-csl-2sp2:~# perf stat -M UNC_M_PMM_READ_LATENCY -a -- sleep 1

 Performance counter stats for 'system wide':

         860649746      unc_m_pmm_rpq_occupancy.all
           1840557      unc_m_pmm_rpq_inserts
       12790627455      unc_m_clockticks

       1.001773348 seconds time elapsed

No metrics 'UNC_M_PMM_BANDWIDTH.TOTAL' or 'UNC_M_PMM_READ_LATENCY' are
reported.

The issue is, the case of an alias expanding to mulitple events is
not supported, typically the uncore events.
(see comments in find_evsel_group()). For detail, please check the
description in patch 'perf util: Support multiple events for metricgroup'.

With this patch set,

root@...-csl-2sp2:~# perf stat -M UNC_M_PMM_BANDWIDTH.TOTAL -a -- sleep 1

 Performance counter stats for 'system wide':

           1842108      unc_m_pmm_rpq_inserts     #    337.2 MB/sec  UNC_M_PMM_BANDWIDTH.TOTAL
           3682209      unc_m_pmm_wpq_inserts

       1.001819706 seconds time elapsed

root@...-csl-2sp2:~# perf stat -M UNC_M_PMM_READ_LATENCY -a -- sleep 1

 Performance counter stats for 'system wide':

         861970685      unc_m_pmm_rpq_occupancy.all #    219.4 ns  UNC_M_PMM_READ_LATENCY
           1842772      unc_m_pmm_rpq_inserts
       12790196356      unc_m_clockticks

       1.001749103 seconds time elapsed

Now we can see the correct metrics 'UNC_M_PMM_BANDWIDTH.TOTAL' and
'UNC_M_PMM_READ_LATENCY'.

Haiyan Song (1):
  perf vendor events intel: Update cascadelakex uncore events to v1.04

Jin Yao (3):
  perf util: Change convert_scale from static to global
  perf util: Scale the metric result
  perf util: Support multiple events for metricgroup

 .../arch/x86/cascadelakex/uncore-memory.json  |  191 ++
 .../arch/x86/cascadelakex/uncore-other.json   | 1809 ++++++++++++++++-
 tools/perf/util/evsel.h                       |    1 +
 tools/perf/util/metricgroup.c                 |   87 +-
 tools/perf/util/metricgroup.h                 |    1 +
 tools/perf/util/pmu.c                         |    6 +-
 tools/perf/util/pmu.h                         |    2 +
 tools/perf/util/stat-shadow.c                 |   65 +-
 8 files changed, 2075 insertions(+), 87 deletions(-)

-- 
2.17.1