Hi,
This is an RFC series of unifying dynamic event interface on ftrace.
Currently ftrace has 3 dynamic event interfaces, kprobes, uprobes
and synthetic. This series unifies kprobes and uprobes event
interface on "dynamic_events". This enables us to add new dynamic
events easily on same interface, e.g. function events.
The older interfaces are left on the tracefs for backward
compatibility at this moment.
dynamic_events syntax has no different from kprobe_events and
uprobe_events. You can use same syntax for dynamic_events interface.
I think we can integrate synthetic events to this dynamic_events
interface but it will requires new syntax. e.g.
echo "s:<event-name> <args>" >> dynamic_events
If it is OK, I'll add it in next version.
BTW, since this dynamic_events interface derived from *probe_events,
it inherits "all clear when truncate file open" behavior. But if you
think this is too aggressive, I can drop it. (even in that case,
kprobe_events/uprobe_events behavior is not changed)
I also introduced a widely used way to erase entries in other
interfaces of ftrace, that is '!'. So you can now use '!event-name'
or '!group/event' to erase an entry in dynamic_events.
(Wait... it has to be '!p:event' as others do??)
Any thought?
Thank you,
---
Masami Hiramatsu (5):
tracing/uprobes: Add busy check when cleanup all uprobes
tracing: Add a unified dynamic event framework
tracing/kprobes: Use dyn_event framework for kprobe events
tracing/uprobes: Use dyn_event framework for uprobe events
tracing: Add generic event-name based remove event method
Documentation/trace/kprobetrace.rst | 3 +
Documentation/trace/uprobetracer.rst | 4 +
kernel/trace/Kconfig | 4 +
kernel/trace/Makefile | 1
kernel/trace/trace.c | 4 +
kernel/trace/trace_dynevent.c | 183 +++++++++++++++++++++++++++++++++
kernel/trace/trace_dynevent.h | 89 ++++++++++++++++
kernel/trace/trace_kprobe.c | 191 +++++++++++++++++++++++-----------
kernel/trace/trace_uprobe.c | 175 +++++++++++++++++++++++--------
9 files changed, 547 insertions(+), 107 deletions(-)
create mode 100644 kernel/trace/trace_dynevent.c
create mode 100644 kernel/trace/trace_dynevent.h
--
Masami Hiramatsu (Linaro) <mhira...@kernel.org>
