linux-kernel - Re: [PATCH 01/22] tools lib traceevent: Add plugin support

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Message-ID: <20131121065820.7e9855c5@gandalf.local.home>
Date:	Thu, 21 Nov 2013 06:58:20 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 01/22] tools lib traceevent: Add plugin support

On Thu, 21 Nov 2013 12:00:59 +0100
Jiri Olsa <jolsa@...hat.com> wrote:

> Backporting plugin support for traceevent lib.
> 
> Backported from Steven Rostedt's trace-cmd repo (HEAD 0f2c2fb):
> git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git
> 
> It's now possible to use following interface to load plugins
> (shared objects) to enahnce pevent object functionality.
> 
> The plugin interface/hooks are as follows:
> (taken from event-parse.h comments)
> 
> - 'pevent_plugin_loader' (required)
>     The function name to initialized the plugin.
> 
>     int pevent_plugin_loader(struct pevent *pevent)
> 
> - 'pevent_plugin_unloader' (optional)
>     The function called just before unloading
> 
>     int pevent_plugin_unloader(void)
> 
> - 'pevent_plugin_options'  (optional)
>     Plugin options that can be set before loading
> 
>     struct plugin_option pevent_plugin_options[] = {
>        {
>                .name = "option-name",
>                .plugin_alias = "overide-file-name", (optional)
>                .description = "description of option to show users",
>        },
>        {
>                .name = NULL,
>        },
>     };
> 
>     Array must end with .name = NULL;
> 
>     The plugin_alias (below) can be used to give a shorter
>     name to access the vairable. Useful if a plugin handles
>     more than one event.
> 
>     NOTE options support is not backported yet.
> 
> - 'pevent_plugin_alias' (optional)
>     The name to use for finding options (uses filename if not defined)
> 
> New traceevent functions are added to search and load
> available plugins:
> 
>   struct plugin_list*
>   traceevent_load_plugins(struct pevent *pevent)
>     - loads plusing for 'struct pevent' object and returns
>       loaded plugins list
> 
>   void traceevent_unload_plugins(struct plugin_list *plugin_list);
>     - unload plugin list
> 
> Signed-off-by: Jiri Olsa <jolsa@...hat.com>
> Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>

As I authored the original code, you can add my:

Signed-off-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve

> Cc: David Ahern <dsahern@...il.com>
> ---
>  tools/lib/traceevent/Makefile       |   6 +-
>  tools/lib/traceevent/event-parse.h  |   5 +
>  tools/lib/traceevent/event-plugin.c | 202 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 212 insertions(+), 1 deletion(-)
>  create mode 100644 tools/lib/traceevent/event-plugin.c
> 
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