linux-kernel - Re: [PATCH 1/3] perf: add a dummy software event to keep tracking

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Date:	Mon, 26 Aug 2013 16:15:34 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 1/3] perf: add a dummy software event to keep tracking

On 07/08/13 16:30, Adrian Hunter wrote:
> When an event is disabled the "tracking" events
> selected by the 'mmap', 'comm' and 'task' bits of
> struct perf_event_attr, are also disabled.  However,
> the information those events provide is necessary to
> resolve symbols for when the main event is re-enabled.
> 
> The "tracking" events can be kept enabled by putting
> them on another event, but that requires an event
> that otherwise does nothing.  A new software event
> PERF_COUNT_SW_DUMMY is added for that purpose.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>

Any comments?

> ---
>  include/uapi/linux/perf_event.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
> index 62c25a2..9e28422 100644
> --- a/include/uapi/linux/perf_event.h
> +++ b/include/uapi/linux/perf_event.h
> @@ -109,6 +109,7 @@ enum perf_sw_ids {
>  	PERF_COUNT_SW_PAGE_FAULTS_MAJ		= 6,
>  	PERF_COUNT_SW_ALIGNMENT_FAULTS		= 7,
>  	PERF_COUNT_SW_EMULATION_FAULTS		= 8,
> +	PERF_COUNT_SW_DUMMY			= 9,
>  
>  	PERF_COUNT_SW_MAX,			/* non-ABI */
>  };
> 

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