linux-kernel - Re: [PATCH 1/2] perf: Add persistent events

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Message-ID: <1274757078.22648.202.camel@gandalf.stny.rr.com>
Date:	Mon, 24 May 2010 23:11:18 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Borislav Petkov <bp@...64.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Lin Ming <ming.m.lin@...el.com>, linux-kernel@...r.kernel.org,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 1/2] perf: Add persistent events

On Sat, 2010-05-22 at 21:04 +0200, Borislav Petkov wrote:
> From: Borislav Petkov <bp@...en8.de>
> 
> Register and enable events marked as persistent right after perf events
> has initialized.
> 
> Not-yet-signed-off-by: Borislav Petkov <bp@...en8.de>
> ---
>  include/linux/ftrace_event.h |   10 +++++++
>  include/linux/perf_event.h   |    1 +
>  kernel/perf_event.c          |   59 +++++++++++++++++++++++++++++++++++++----
>  kernel/trace/trace.h         |    1 -
>  4 files changed, 64 insertions(+), 7 deletions(-)
> 
> diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
> index c0f4b36..b40d637 100644
> --- a/include/linux/ftrace_event.h
> +++ b/include/linux/ftrace_event.h
> @@ -13,6 +13,8 @@ struct dentry;
>  
>  DECLARE_PER_CPU(struct trace_seq, ftrace_event_seq);
>  
> +extern struct list_head ftrace_events;
> +
>  struct trace_print_flags {
>  	unsigned long		mask;
>  	const char		*name;
> @@ -134,6 +136,7 @@ struct ftrace_event_call {
>  	int			perf_refcount;
>  	int			(*perf_event_enable)(struct ftrace_event_call *);
>  	void			(*perf_event_disable)(struct ftrace_event_call *);
> +	unsigned int		type;
>  };

If you look at lastest tip/perf/core, can you add this to the
ftrace_event_class instead. Or if it must be per event, can we find a
way to include it into the flags field. Changes to flags must have the
event_mutex held.

-- Steve

>  
>  #define PERF_MAX_TRACE_SIZE	2048
> @@ -155,6 +158,13 @@ enum {
>  	FILTER_PTR_STRING,
>  };



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