linux-kernel - using SDT events

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Date:   Tue, 27 Sep 2016 10:55:38 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     wang@...radead.org, Jiri Olsa <jolsa@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: using SDT events

Masami,

	Testing something else (event aliases/JSON) I saw the many sdt
events available via 'perf list', decided to use the usual workflow,
failed, what am I doing wrong?


[root@...et ~]# perf list sdt_qemu:pci*

List of pre-defined events (to be used in -e):

  sdt_qemu:pci_cfg_read                              [SDT event]
  sdt_qemu:pci_cfg_write                             [SDT event]
  sdt_qemu:pci_update_mappings_add                   [SDT event]
  sdt_qemu:pci_update_mappings_del                   [SDT event]
[root@...et ~]# perf record -e sdt_qemu:pci* -a
event syntax error: 'sdt_qemu:pci*'
                     \___ unknown tracepoint

Error:	File /sys/kernel/debug/tracing/events/sdt_qemu/pci* not found.
Hint:	Perhaps this kernel misses some CONFIG_ setting to enable this
feature?.

Run 'perf list' for a list of valid events

 Usage: perf record [<options>] [<command>]
    or: perf record [<options>] -- <command> [<options>]

    -e, --event <event>   event selector. use 'perf list' to list
available events
[root@...et ~]#