linux-kernel - Re: [PATCH v3 4/7] perf probe: Generate event name with line number

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Message-ID: <20191118220304.GE20465@kernel.org>
Date:   Mon, 18 Nov 2019 19:03:04 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH v3 4/7] perf probe: Generate event name with line number

Em Mon, Nov 18, 2019 at 05:12:20PM +0900, Masami Hiramatsu escreveu:
> Generate event name from function name with line number
> as <function>_L<line_number>. Note that this is only for
> the new event which is defined by the line number of
> function (except for line 0).
> 
> If there is another event on same line, you have to use
> "-f" option. In that case, the new event has "_1" suffix.
> 
>  e.g.
>   # perf probe -a kernel_read:2
>   Added new event:
>     probe:kernel_read_L2 (on kernel_read:2)
> 
>   You can now use it in all perf tools, such as:
> 
>   	perf record -e probe:kernel_read_L2 -aR sleep 1
> 
> 
> But if we omit the line number or 0th line, it will
> have no suffix.
> 
>   # perf probe -a kernel_read:0
>   Added new event:
>     probe:kernel_read (on kernel_read)
> 
>   You can now use it in all perf tools, such as:
> 
>   	perf record -e probe:kernel_read -aR sleep 1
> 
> # perf probe -l
>   probe:kernel_read    (on kernel_read@...ux-5.0.0/fs/read_write.c)
>   probe:kernel_read_L2 (on kernel_read:2@...ux-5.0.0/fs/read_write.c)

Thanks, tested and applied.

- Arnaldo