Hi Masami,

On Tue, 2017-09-12 at 10:50 +0900, Masami Hiramatsu wrote:

On Tue,  5 Sep 2017 16:57:12 -0500
Tom Zanussi [off-list ref] wrote:

quoted

Hi,

This is V2 of the inter-event tracing patchset.

There are too many changes to list in detail, most of them directly
addressing input from V1, but here are the major changes from V1
(thanks to everyone who reviewed V1 and thanks to both Vedang Patel
and Baohong Liu for their contributions and included patches):

[..]

quoted

 Documentation/trace/events.txt      |  431 ++++
 include/linux/ring_buffer.h         |   17 +-
 include/linux/trace_events.h        |   24 +-
 include/linux/tracepoint-defs.h     |    1 +
 kernel/trace/ring_buffer.c          |  126 +-
 kernel/trace/trace.c                |  205 +-
 kernel/trace/trace.h                |   25 +-
 kernel/trace/trace_events.c         |   51 +-
 kernel/trace/trace_events_hist.c    | 4472 +++++++++++++++++++++++++++++++----
 kernel/trace/trace_events_trigger.c |   53 +-
 kernel/trace/trace_kprobe.c         |   18 +-
 kernel/trace/trace_probe.c          |   86 -
 kernel/trace/trace_probe.h          |    7 -
 kernel/trace/trace_uprobe.c         |    2 +-
 kernel/trace/tracing_map.c          |  229 +-
 kernel/trace/tracing_map.h          |   20 +-
 kernel/tracepoint.c                 |   18 +-
 17 files changed, 5073 insertions(+), 712 deletions(-)

There seems no Makefile and Kconfig changes. Would this mean
we just need CONFIG_HIST_TRIGGERS=y to enable it?

Yes - I didn't see a need for a separate config for this.

I think you'd better update the HIST_TRIGGER's description
so that user can notice which should be enabled for inter-event
tracing.

Good point, will do.

Thanks,

Tom