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    SubjectRe: [PATCH v8 00/12] Introduce CAP_PERFMON to secure system performance monitoring and observability
    Em Tue, Apr 07, 2020 at 11:30:14AM -0300, Arnaldo Carvalho de Melo escreveu:
    > [perf@five ~]$ type perf
    > perf is hashed (/home/perf/bin/perf)
    > [perf@five ~]$ getcap /home/perf/bin/perf
    > /home/perf/bin/perf = cap_sys_ptrace,cap_syslog,38+ep
    > [perf@five ~]$ groups
    > perf perf_users
    > [perf@five ~]$ id
    > uid=1002(perf) gid=1002(perf) groups=1002(perf),1003(perf_users) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
    > [perf@five ~]$ perf top --stdio
    > Error:
    > Failed to mmap with 1 (Operation not permitted)
    > [perf@five ~]$ perf record -a
    > ^C[ perf record: Woken up 1 times to write data ]
    > [ perf record: Captured and wrote 1.177 MB perf.data (1552 samples) ]
    >
    > [perf@five ~]$ perf evlist
    > cycles:u
    > [perf@five ~]$

    Humm, perf record falls back to cycles:u after initially trying cycles
    (i.e. kernel and userspace), lemme see trying 'perf top -e cycles:u',
    lemme test, humm not really:

    [perf@five ~]$ perf top --stdio -e cycles:u
    Error:
    Failed to mmap with 1 (Operation not permitted)
    [perf@five ~]$ perf record -e cycles:u -a sleep 1
    [ perf record: Woken up 1 times to write data ]
    [ perf record: Captured and wrote 1.123 MB perf.data (132 samples) ]
    [perf@five ~]$

    Back to debugging this.

    - Arnaldo

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