tracepoint: Use struct pointer instead of name hash for reg/unreg tracepoints
authorMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Tue, 8 Apr 2014 21:26:21 +0000 (17:26 -0400)
committerSteven Rostedt <rostedt@goodmis.org>
Wed, 9 Apr 2014 00:43:28 +0000 (20:43 -0400)
commitde7b2973903c6cc50b31ee5682a69b2219b9919d
treea5b9d78102854b0073f5893cafb29920f8fb55e1
parent68114e5eb862ad0a7a261b91497281b026102715
tracepoint: Use struct pointer instead of name hash for reg/unreg tracepoints

Register/unregister tracepoint probes with struct tracepoint pointer
rather than tracepoint name.

This change, which vastly simplifies tracepoint.c, has been proposed by
Steven Rostedt. It also removes 8.8kB (mostly of text) to the vmlinux
size.

From this point on, the tracers need to pass a struct tracepoint pointer
to probe register/unregister. A probe can now only be connected to a
tracepoint that exists. Moreover, tracers are responsible for
unregistering the probe before the module containing its associated
tracepoint is unloaded.

   text    data     bss     dec     hex filename
10443444        4282528 10391552        25117524        17f4354 vmlinux.orig
10434930        4282848 10391552        25109330        17f2352 vmlinux

Link: http://lkml.kernel.org/r/1396992381-23785-2-git-send-email-mathieu.desnoyers@efficios.com
CC: Ingo Molnar <mingo@kernel.org>
CC: Frederic Weisbecker <fweisbec@gmail.com>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Frank Ch. Eigler <fche@redhat.com>
CC: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
[ SDR - fixed return val in void func in tracepoint_module_going() ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
include/linux/ftrace_event.h
include/linux/tracepoint.h
include/trace/ftrace.h
kernel/trace/trace_events.c
kernel/trace/trace_events_trigger.c
kernel/trace/trace_kprobe.c
kernel/trace/trace_output.c
kernel/trace/trace_uprobe.c
kernel/tracepoint.c