linux-kernel - Re: [PATCH v2 00/40] tracing: Inter-event (e.g. latency) support

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Date:   Tue, 12 Sep 2017 09:14:41 -0500
From:   Tom Zanussi <tom.zanussi@...ux.intel.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     rostedt@...dmis.org, tglx@...utronix.de, namhyung@...nel.org,
        vedang.patel@...el.com, bigeasy@...utronix.de,
        joel.opensrc@...il.com, joelaf@...gle.com,
        mathieu.desnoyers@...icios.com, baohong.liu@...el.com,
        linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: [PATCH v2 00/40] tracing: Inter-event (e.g. latency) support

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 <tom.zanussi@...ux.intel.com> wrote:
> 
> > 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):
> [..]
> 
> > 
> >  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