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SubjectRe: [PATCH 01/22] tools lib traceevent: Add plugin support
On Thu, 21 Nov 2013 12:00:59 +0100
Jiri Olsa <jolsa@redhat.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@redhat.com>
> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
> Cc: Frederic Weisbecker <fweisbec@gmail.com>
> Cc: Ingo Molnar <mingo@elte.hu>
> Cc: Namhyung Kim <namhyung@kernel.org>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
> Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
> Cc: Steven Rostedt <rostedt@goodmis.org>

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

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

-- Steve

> Cc: David Ahern <dsahern@gmail.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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