linux-kernel - Re: [PATCH v2] perf/sdt: Show proper hint

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Message-ID: <20170203151826.GA2712@redhat.com>
Date:   Fri, 3 Feb 2017 13:18:26 -0200
From:   Arnaldo Carvalho de Melo <acme@...hat.com>
To:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...hat.com,
        alexis.berlemont@...il.com, peterz@...radead.org,
        alexander.shishkin@...ux.intel.com, mpe@...erman.id.au,
        naveen.n.rao@...ux.vnet.ibm.com, mhiramat@...nel.org,
        maddy@...ux.vnet.ibm.com
Subject: Re: [PATCH v2] perf/sdt: Show proper hint

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?

- Arnaldo