tree 93a95edab3edcd01ac77eb658f62c8c62f663fcb
parent d8811b70869ca9cd9836757d56263cc9e80f11b7
author Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com> 1636973142 +0200
committer Steven Rostedt (VMware) <rostedt@goodmis.org> 1637530500 -0500

libtracefs: New APIs for dynamic events

Ftrace supports dynamic events, created by the user - kprobes, uprobes,
eprobes and synthetic events. There are two interfaces for managing
these events - new common "dynamic_events" file and event specific
"kprobe_events", "uprobe_events", "synthetic_events" files. The
configuration syntax for all dynamic events is almost the same.
To simplify support of dynamic events in the tracefs library, new
APIs are introduced. They handle both configuration interfaces -
the common "dynamic_events" file is preferred, if available.
On the old kernels, where this file is missing, the event
specific files are used. The new APIs can be used to create,
delete and get ftrace dynamic events from any type:

 enum tracefs_dynevent_type;
 tracefs_dynevent_create();
 tracefs_dynevent_destroy();
 tracefs_dynevent_destroy_all();
 tracefs_dynevent_free();
 tracefs_dynevent_list_free();
 tracefs_dynevent_get_all();

There is no public API for allocation of a new dynamic event, as that
logic is specific for each dynamic event type.

Link: https://lore.kernel.org/linux-trace-devel/20211115104556.121359-2-tz.stoyanov@gmail.com

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>