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    SubjectRe: [PATCH 2/5] ftrace perf: Move exclude_kernel tracepoint check to init event
    On Wed, 16 Mar 2016 15:34:30 +0100
    Jiri Olsa <jolsa@kernel.org> wrote:

    > We suppress events with attr::exclude_kernel set when
    > the event is generated, so following capture will
    > give no warning but won't produce any data:
    >
    > $ sudo perf record -e sched:sched_switch:u ls
    > $ sudo /perf script | wc -l
    > 0
    >
    > Checking the attr::exclude_(kernel|user) at the event
    > init time and failing right away for tracepoints from
    > uprobes/kprobes and native ones:
    >
    > $ sudo perf record -e sched:sched_switch:u ls
    > Error:
    > The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (sched:sched_switch).
    > /bin/dmesg may provide additional information.
    > No CONFIG_PERF_EVENTS=y kernel support configured?
    >
    > $ sudo perf record -e probe:sys_read:u ls
    > Error:
    > The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (probe:sys_read).
    > /bin/dmesg may provide additional information.
    > No CONFIG_PERF_EVENTS=y kernel support configured?
    >
    > $ ./perf record -e probe_ex:main:k ./ex
    > Error:
    > The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (probe_ex:main).
    > /bin/dmesg may provide additional information.
    > No CONFIG_PERF_EVENTS=y kernel support configured?
    >
    > Acked-by: Namhyung Kim <namhyung@kernel.org>
    > Signed-off-by: Jiri Olsa <jolsa@kernel.org>

    Acked-by: Steven Rostedt <rostedt@goodmis.org>

    -- Steve

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