* using SDT events
@ 2016-09-27 13:55 Arnaldo Carvalho de Melo
2016-09-27 18:40 ` Masami Hiramatsu
0 siblings, 1 reply; 3+ messages in thread
From: Arnaldo Carvalho de Melo @ 2016-09-27 13:55 UTC (permalink / raw)
To: Masami Hiramatsu
Cc: wang, Jiri Olsa, David Ahern, Namhyung Kim,
Linux Kernel Mailing List
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@jouet ~]# 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@jouet ~]# 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@jouet ~]#
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: using SDT events
2016-09-27 13:55 using SDT events Arnaldo Carvalho de Melo
@ 2016-09-27 18:40 ` Masami Hiramatsu
2016-09-28 13:34 ` Arnaldo Carvalho de Melo
0 siblings, 1 reply; 3+ messages in thread
From: Masami Hiramatsu @ 2016-09-27 18:40 UTC (permalink / raw)
To: Arnaldo Carvalho de Melo
Cc: wang, Jiri Olsa, David Ahern, Namhyung Kim,
Linux Kernel Mailing List
On Tue, 27 Sep 2016 10:55:38 -0300
Arnaldo Carvalho de Melo <acme@kernel.org> wrote:
> 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?
No, that is not supported yet. So I dropped perf-list support from
the latest series...
https://lkml.org/lkml/2016/7/1/133
The unresolved problems are
- how we treat sdt events after recorded? remove or leave it as tracepoint?
- what should be done if we found the tracepoint which has same name of the
SDT. (we can not reserve tracepoint name beforehand)
- Sometimes SDT name can be conflict, even on same binary.
>
>
> [root@jouet ~]# 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@jouet ~]# 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@jouet ~]#
--
Masami Hiramatsu <mhiramat@kernel.org>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: using SDT events
2016-09-27 18:40 ` Masami Hiramatsu
@ 2016-09-28 13:34 ` Arnaldo Carvalho de Melo
0 siblings, 0 replies; 3+ messages in thread
From: Arnaldo Carvalho de Melo @ 2016-09-28 13:34 UTC (permalink / raw)
To: Masami Hiramatsu
Cc: Wang Nan, Jiri Olsa, David Ahern, Namhyung Kim,
Linux Kernel Mailing List
Em Tue, Sep 27, 2016 at 11:40:26AM -0700, Masami Hiramatsu escreveu:
> On Tue, 27 Sep 2016 10:55:38 -0300
> Arnaldo Carvalho de Melo <acme@kernel.org> wrote:
>
> > 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?
>
> No, that is not supported yet. So I dropped perf-list support from
> the latest series...
Ok, I guess I recall that discussion, will add some warning about that
in the 'perf list' output.
- Arnaldo
> https://lkml.org/lkml/2016/7/1/133
>
> The unresolved problems are
> - how we treat sdt events after recorded? remove or leave it as tracepoint?
> - what should be done if we found the tracepoint which has same name of the
> SDT. (we can not reserve tracepoint name beforehand)
> - Sometimes SDT name can be conflict, even on same binary.
>
>
> >
> >
> > [root@jouet ~]# 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@jouet ~]# 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@jouet ~]#
>
>
> --
> Masami Hiramatsu <mhiramat@kernel.org>
^ permalink raw reply [flat|nested] 3+ messages in thread
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