linux-kernel - Re: [PATCH 3/7] ftrace, perf: Add open/close tracepoint perf registration actions

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Date:	Thu, 2 Feb 2012 18:35:06 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	rostedt@...dmis.org, mingo@...hat.com, paulus@...ba.org,
	acme@...stprotocols.net, a.p.zijlstra@...llo.nl,
	linux-kernel@...r.kernel.org, aarapov@...hat.com
Subject: Re: [PATCH 3/7] ftrace, perf: Add open/close tracepoint perf
 registration actions

On Sat, Jan 28, 2012 at 07:43:25PM +0100, Jiri Olsa wrote:
> Adding TRACE_REG_PERF_OPEN and TRACE_REG_PERF_CLOSE to differentiate
> register/unregister from open/close actions.
> 
> The register/unregister actions are invoked for the first/last
> tracepoint user when opening/closing the event.
> 
> The open/close actions are invoked for each tracepoint user when
> opening/closing the event.
> 
> Signed-off-by: Jiri Olsa <jolsa@...hat.com>
> ---
>  include/linux/ftrace_event.h    |    6 +-
>  kernel/trace/trace.h            |    5 ++
>  kernel/trace/trace_event_perf.c |  116 +++++++++++++++++++++++++--------------
>  kernel/trace/trace_events.c     |   10 ++-
>  kernel/trace/trace_kprobe.c     |    6 ++-
>  kernel/trace/trace_syscalls.c   |   14 +++-
>  6 files changed, 106 insertions(+), 51 deletions(-)
> 
> diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
> index c3da42d..195e360 100644
> --- a/include/linux/ftrace_event.h
> +++ b/include/linux/ftrace_event.h
> @@ -146,6 +146,8 @@ enum trace_reg {
>  	TRACE_REG_UNREGISTER,
>  	TRACE_REG_PERF_REGISTER,
>  	TRACE_REG_PERF_UNREGISTER,
> +	TRACE_REG_PERF_OPEN,
> +	TRACE_REG_PERF_CLOSE,
>  };
>  
>  struct ftrace_event_call;
> @@ -157,7 +159,7 @@ struct ftrace_event_class {
>  	void			*perf_probe;
>  #endif
>  	int			(*reg)(struct ftrace_event_call *event,
> -				       enum trace_reg type);
> +				       enum trace_reg type, void *data);
>  	int			(*define_fields)(struct ftrace_event_call *);
>  	struct list_head	*(*get_fields)(struct ftrace_event_call *);
>  	struct list_head	fields;
> @@ -165,7 +167,7 @@ struct ftrace_event_class {
>  };
>  
>  extern int ftrace_event_reg(struct ftrace_event_call *event,
> -			    enum trace_reg type);
> +			    enum trace_reg type, void *data);
>  
>  enum {
>  	TRACE_EVENT_FL_ENABLED_BIT,
> diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
> index 55c6ea0..0eaf077 100644
> --- a/kernel/trace/trace.h
> +++ b/kernel/trace/trace.h
> @@ -828,4 +828,9 @@ extern const char *__stop___trace_bprintk_fmt[];
>  	FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
>  #include "trace_entries.h"
>  
> +#ifdef CONFIG_PERF_EVENTS
> +int perf_ftrace_event_register(struct ftrace_event_call *call,
> +			       enum trace_reg type, void *data);
> +#endif

Seem to belong to a further patch. Nevermind.

Acked-by: Frederic Weisbecker <fweisbec@...il.com>
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