linux-kernel - Re: [PATCH v1 2/4] perf trace: Migrate BPF augmentation to use a skeleton

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Message-ID: <ZN0EC+26K0K9DlWb@kernel.org>
Date:   Wed, 16 Aug 2023 14:14:51 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, Fangrui Song <maskray@...gle.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Andi Kleen <ak@...ux.intel.com>, Leo Yan <leo.yan@...aro.org>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Carsten Haitzler <carsten.haitzler@....com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        James Clark <james.clark@....com>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Eduard Zingerman <eddyz87@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Yonghong Song <yhs@...com>, Rob Herring <robh@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, llvm@...ts.linux.dev,
        Wang Nan <wangnan0@...wei.com>,
        Wang ShaoBo <bobo.shaobowang@...wei.com>,
        YueHaibing <yuehaibing@...wei.com>,
        He Kuang <hekuang@...wei.com>,
        Brendan Gregg <brendan.d.gregg@...il.com>
Subject: Re: [PATCH v1 2/4] perf trace: Migrate BPF augmentation to use a
 skeleton

Em Wed, Aug 16, 2023 at 01:08:14PM -0300, Arnaldo Carvalho de Melo escreveu:
> [acme@...e ~]$ getcap ~/bin/perf
> /var/home/acme/bin/perf cap_perfmon,cap_bpf=ep
> [acme@...e ~]$ cat /proc/sys/kernel/unprivileged_bpf_disabled
> 2
> [acme@...e ~]$ cat /proc/sys/kernel/perf_event_paranoid
> -1

This last one can remain at 2:

[acme@...e ~]$ cat /proc/sys/kernel/perf_event_paranoid
2
[acme@...e ~]$ perf trace -e bpf*,perf*,openat,connect* --max-events=10
     0.000 ( 0.031 ms): systemd-oomd/1151 openat(dfd: CWD, filename: "/proc/meminfo", flags: RDONLY|CLOEXEC)    = 11
    25.532 (         ): gnome-terminal/3223 openat(dfd: CWD, filename: "/proc/1244100/cmdline")                ...
   249.996 ( 0.031 ms): systemd-oomd/1151 openat(dfd: CWD, filename: "/proc/meminfo", flags: RDONLY|CLOEXEC)    = 11
   423.853 ( 0.036 ms): pool/2490 connect(fd: 7, uservaddr: { .family: LOCAL, path: /var/run/.heim_org.h5l.kcm-socket }, addrlen: 110) = 0
   423.929 ( 0.021 ms): sssd_kcm/2514 openat(dfd: CWD, filename: "/proc/2486/cmdline")                      = 16
   499.988 ( 0.030 ms): systemd-oomd/1151 openat(dfd: CWD, filename: "/proc/meminfo", flags: RDONLY|CLOEXEC)    = 11
   749.981 ( 0.032 ms): systemd-oomd/1151 openat(dfd: CWD, filename: "/proc/meminfo", flags: RDONLY|CLOEXEC)    = 11
   775.441 (         ): gnome-terminal/3223 openat(dfd: CWD, filename: "/proc/1244100/cmdline")                ...
   999.988 ( 0.044 ms): systemd-oomd/1151 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1001.slice/user@...1.service/memory.pressure", flags: RDONLY|CLOEXEC) = 11
  1000.091 ( 0.010 ms): systemd-oomd/1151 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1001.slice/user@...1.service/memory.current", flags: RDONLY|CLOEXEC) = 11
[acme@...e ~]$