[PATCH v2 0/1] perf: Add --pmu-filter option for filtering PMUs

[Qinxin Xia]

This patch adds a new --pmu-filter option to perf-stat command to allow
filtering events on specific PMUs. This is useful when there are
multiple PMUs with same type (e.g. hisi_sicl2_cpa0 and hisi_sicl0_cpa0).

[root@localhost tmp]# perf stat -M cpa_p0_avg_bw
 Performance counter stats for 'system wide':

    19,417,779,115      hisi_sicl0_cpa0/cpa_cycles/      #     0.00 cpa_p0_avg_bw
                 0      hisi_sicl0_cpa0/cpa_p0_wr_dat/
                 0      hisi_sicl0_cpa0/cpa_p0_rd_dat_64b/
                 0      hisi_sicl0_cpa0/cpa_p0_rd_dat_32b/
    19,417,751,103      hisi_sicl10_cpa0/cpa_cycles/     #     0.00 cpa_p0_avg_bw
                 0      hisi_sicl10_cpa0/cpa_p0_wr_dat/
                 0      hisi_sicl10_cpa0/cpa_p0_rd_dat_64b/
                 0      hisi_sicl10_cpa0/cpa_p0_rd_dat_32b/
    19,417,730,679      hisi_sicl2_cpa0/cpa_cycles/      #     0.31 cpa_p0_avg_bw
        75,635,749      hisi_sicl2_cpa0/cpa_p0_wr_dat/
        18,520,640      hisi_sicl2_cpa0/cpa_p0_rd_dat_64b/
                 0      hisi_sicl2_cpa0/cpa_p0_rd_dat_32b/
    19,417,674,227      hisi_sicl8_cpa0/cpa_cycles/      #     0.00 cpa_p0_avg_bw
                 0      hisi_sicl8_cpa0/cpa_p0_wr_dat/
                 0      hisi_sicl8_cpa0/cpa_p0_rd_dat_64b/
                 0      hisi_sicl8_cpa0/cpa_p0_rd_dat_32b/

      19.417734480 seconds time elapsed

[root@localhost tmp]# perf stat --pmu-filter hisi_sicl2_cpa0 -M cpa_p0_avg_bw
 Performance counter stats for 'system wide':

     6,234,093,559      cpa_cycles                       #     0.60 cpa_p0_avg_bw
        50,548,465      cpa_p0_wr_dat
         7,552,182      cpa_p0_rd_dat_64b
                 0      cpa_p0_rd_dat_32b

       6.234139320 seconds time elapsed

wildcard match:
[root@localhost ~]# ./perf stat --pmu-filter hisi_sicl[2,8]_cpa0 -M cpa_p0_avg_bw
 Performance counter stats for 'system wide':

    18,505,025,031      hisi_sicl2_cpa0/cpa_cycles/      #     0.42 cpa_p0_avg_bw
        80,007,944      hisi_sicl2_cpa0/cpa_p0_wr_dat/
        42,014,906      hisi_sicl2_cpa0/cpa_p0_rd_dat_64b/
                 0      hisi_sicl2_cpa0/cpa_p0_rd_dat_32b/
    18,504,957,351      hisi_sicl8_cpa0/cpa_cycles/      #     0.00 cpa_p0_avg_bw
                 0      hisi_sicl8_cpa0/cpa_p0_wr_dat/
                 0      hisi_sicl8_cpa0/cpa_p0_rd_dat_64b/
                 0      hisi_sicl8_cpa0/cpa_p0_rd_dat_32b/

      18.504994880 seconds time elapsed

Changes since V1:
- Address the comments from Namhyung, the description of the event filter in commit
  info is omitted, and wildcard matching is supported for pmu-filter.
- Link: https://lore.kernel.org/all/20260225034125.2157622-2-xiaqinxin@xxxxxxxxxx/

Changes since RFC:
- Address the comments from Ian, replace '--uncorepmu'  with '--pmu-filter'.
- Link: https://lore.kernel.org/linux-perf-users/20260120095058.2778834-1-xiaqinxin@xxxxxxxxxx/

Qinxin Xia (1):
  perf: Add --pmu-filter option for filtering PMUs

 tools/perf/Documentation/perf-stat.txt |  4 ++++
 tools/perf/builtin-stat.c              | 19 +++++++++++++++++++
 tools/perf/util/metricgroup.c          | 18 +++++++++++++-----
 tools/perf/util/parse-events.c         |  2 +-
 4 files changed, 37 insertions(+), 6 deletions(-)

-- 
2.33.0