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    SubjectRe: [PATCH v2] perf/sdt: Show proper hint

    * Arnaldo Carvalho de Melo <acme@redhat.com> wrote:

    > Em Fri, Feb 03, 2017 at 03:56:42PM +0530, Ravi Bangoria escreveu:
    > > After patch:
    > > $ perf record -a -e sdt_glib:idle__add
    > > event syntax error: 'sdt_glib:idle__add'
    > > \___ unknown tracepoint
    > >
    > > Error: File /sys/kernel/debug/tracing/events/sdt_glib/idle__add not found.
    > > Hint: SDT event cannot be directly recorded on. Please use 'perf probe sdt_glib:idle__add' before recording it.
    > > ...
    > >
    > > $ perf probe sdt_glib:idle__add
    > > Added new event:
    > > sdt_glib:idle__add (on %idle__add in /usr/lib64/libglib-2.0.so.0.5000.2)
    > >
    > > You can now use it in all perf tools, such as:
    > >
    > > perf record -e sdt_glib:idle__add -aR sleep 1
    > >
    > > $ perf record -a -e sdt_glib:idle__add
    > > [ perf record: Woken up 1 times to write data ]
    > > [ perf record: Captured and wrote 0.175 MB perf.data ]
    >
    > Looks much better! Thanks!
    >
    > Unsure if we should state somewhere that this needs to be done only once
    > per boot.
    >
    > Ingo, are you ok now? Ack?

    Yeah, looks perfect to me!

    Acked-by: Ingo Molnar <mingo@kernel.org>

    Thanks,

    Ingo

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