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Date: Fri, 28 Jul 2023 11:29:33 -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>,
Eduard Zingerman <eddyz87@...il.com>,
Kan Liang <kan.liang@...ux.intel.com>,
Rob Herring <robh@...nel.org>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
bpf@...r.kernel.org, Wang Nan <wangnan0@...wei.com>,
Wang ShaoBo <bobo.shaobowang@...wei.com>,
YueHaibing <yuehaibing@...wei.com>, He Kuang <hekuang@...wei.com>
Subject: Re: [PATCH v1 0/3] Remove BPF arrays from perf event parsing
Em Thu, Jul 27, 2023 at 05:12:09PM -0700, Ian Rogers escreveu:
> Event parsing was recently refactored:
> https://lore.kernel.org/all/20230502223851.2234828-1-irogers@google.com/
>
> During these changes I wanted to get coverage of all parts of the
> parse-events.y and found that I couldn't test the array code.
>
> The first patch fixes a BPF testing issue.
> The 2nd and 3rd patch remove the BPF array event parsing code so that
> it isn't adding complexity to event parsing.
Thanks, applied and tested that 'perf trace' using the old BPF perf
integration continues to work modulo the sockaddr collectors, but that
is a problem with a newer kernel BPF verifier or clang, will
investigate.
With those commented out:
diff --git a/tools/perf/examples/bpf/augmented_raw_syscalls.c b/tools/perf/examples/bpf/augmented_raw_syscalls.c
index 9a03189d33d3816a..97871e2bd3a47bdf 100644
--- a/tools/perf/examples/bpf/augmented_raw_syscalls.c
+++ b/tools/perf/examples/bpf/augmented_raw_syscalls.c
@@ -176,6 +176,7 @@ int syscall_unaugmented(struct syscall_enter_args *args)
return 1;
}
+#if 0
/*
* These will be tail_called from SEC("raw_syscalls:sys_enter"), so will find in
* augmented_args_tmp what was read by that raw_syscalls:sys_enter and go
@@ -219,6 +220,7 @@ int sys_enter_sendto(struct syscall_enter_args *args)
return augmented__output(args, augmented_args, len + socklen);
}
+#endif
SEC("!syscalls:sys_enter_open")
int sys_enter_open(struct syscall_enter_args *args)
# perf trace -e /home/acme/git/perf-tools-next/tools/perf/examples/bpf/augmented_raw_syscalls.c,open*
0.000 systemd-oomd/952 openat(dfd: CWD, filename: "/proc/meminfo", flags: RDONLY|CLOEXEC) = 12
95.302 thermald/1231 openat(dfd: CWD, filename: "/sys/class/powercap/intel-rapl/intel-rapl:0/intel-rapl:0:2/energy_uj") = 13
95.586 thermald/1231 openat(dfd: CWD, filename: "/sys/class/powercap/intel-rapl/intel-rapl:0/energy_uj") = 13
95.857 thermald/1231 openat(dfd: CWD, filename: "/sys/class/thermal/thermal_zone2/temp") = 13
250.064 systemd-oomd/952 openat(dfd: CWD, filename: "/proc/meminfo", flags: RDONLY|CLOEXEC) = 12
500.054 systemd-oomd/952 openat(dfd: CWD, filename: "/proc/meminfo", flags: RDONLY|CLOEXEC) = 12
500.472 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/session.slice/memory.pressure", flags: RDONLY|CLOEXEC) = 12
500.669 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/session.slice/memory.current", flags: RDONLY|CLOEXEC) = 12
500.777 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/session.slice/memory.min", flags: RDONLY|CLOEXEC) = 12
500.873 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/session.slice/memory.low", flags: RDONLY|CLOEXEC) = 12
500.968 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/session.slice/memory.swap.current", flags: RDONLY|CLOEXEC) = 12
501.062 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/session.slice/memory.stat", flags: RDONLY|CLOEXEC) = 12
501.435 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/memory.pressure", flags: RDONLY|CLOEXEC) = 12
501.585 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/memory.current", flags: RDONLY|CLOEXEC) = 12
501.676 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/memory.min", flags: RDONLY|CLOEXEC) = 12
501.761 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/memory.low", flags: RDONLY|CLOEXEC) = 12
501.845 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/memory.swap.current", flags: RDONLY|CLOEXEC) = 12
501.929 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/memory.stat", flags: RDONLY|CLOEXEC) = 12
502.118 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/app-gnome\x2dsession\x2dmanager.slice/memory.pressure", flags: RDONLY|CLOEXEC) = 12
502.272 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/app-gnome\x2dsession\x2dmanager.slice/memory.current", flags: RDONLY|CLOEXEC) = 12
502.367 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/app-gnome\x2dsession\x2dmanager.slice/memory.min", flags: RDONLY|CLOEXEC) = 12
502.454 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/app-gnome\x2dsession\x2dmanager.slice/memory.low", flags: RDONLY|CLOEXEC) = 12
502.542 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/app-gnome\x2dsession\x2dmanager.slice/memory.swap.current", flags: RDONLY|CLOEXEC) = 12
502.628 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/app-gnome\x2dsession\x2dmanager.slice/memory.stat", flags: RDONLY|CLOEXEC) = 12
502.796 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/app-org.gnome.Terminal.slice/memory.pressure", flags: RDONLY|CLOEXEC) = 12
502.928 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/app-org.gnome.Terminal.slice/memory.current", flags: RDONLY|CLOEXEC) = 12
503.037 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/app-org.gnome.Terminal.slice/memory.min", flags: RDONLY|CLOEXEC) = 12
503.162 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/app-org.gnome.Terminal.slice/memory.low", flags: RDONLY|CLOEXEC) = 12
503.255 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/app-org.gnome.Terminal.slice/memory.swap.current", flags: RDONLY|CLOEXEC) = 12
503.341 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1000.slice/user@...0.service/app.slice/app-org.gnome.Terminal.slice/memory.stat", flags: RDONLY|CLOEXEC) = 12
503.495 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/system.slice/memory.pressure", flags: RDONLY|CLOEXEC) = 12
503.620 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/system.slice/memory.current", flags: RDONLY|CLOEXEC) = 12
503.703 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/system.slice/memory.min", flags: RDONLY|CLOEXEC) = 12
503.782 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/system.slice/memory.low", flags: RDONLY|CLOEXEC) = 12
503.861 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/system.slice/memory.swap.current", flags: RDONLY|CLOEXEC) = 12
503.939 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/system.slice/memory.stat", flags: RDONLY|CLOEXEC) = 12
504.079 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1001.slice/user@...1.service/app.slice/memory.pressure", flags: RDONLY|CLOEXEC) = 12
504.240 systemd-oomd/952 openat(dfd: CWD, filename: "/sys/fs/cgroup/user.slice/user-1001.slice/user@...1.service/app.slice/memory.current", flags: RDONLY|CLOEXEC) = 12
^C
- Arnaldo
> Ian Rogers (3):
> perf parse-event: Avoid BPF test segv
> perf tools: Revert enable indices setting syntax for BPF map
> perf parse-events: Remove array remnants
>
> tools/perf/util/bpf-loader.c | 101 ---------------------------
> tools/perf/util/parse-events.c | 18 +----
> tools/perf/util/parse-events.h | 10 ---
> tools/perf/util/parse-events.l | 11 ---
> tools/perf/util/parse-events.y | 122 ---------------------------------
> 5 files changed, 2 insertions(+), 260 deletions(-)
>
> --
> 2.41.0.487.g6d72f3e995-goog
>
--
- Arnaldo
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