Re: [Xen-devel] [PATCH v2 06/16] xen: sched: tracing: enable TSC tracing for all events

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On Tue, 2016-02-16 at 13:21 -0500, Meng Xu wrote:
> Hi Dario,
> 
> Since this patch did some obvious change, I will reply with
> reviewed-by, although my reviewed-by does not count much. ;-)
> 
That can't be less true. First of all, you're the original author of
this code, and you and, although I'm the maintainer, your group are the
one doing active development on it, so your opinion does have a weight.

But even if that wasn't the case, every reviewed-by is important, and
helps the project. It will be maintainers' and committer's job to
properly take each one into account in the most appropriate way, but
that does not mean it's not worthwhile for you (or anyone else) to
review the patches and express your acknowledgment, or send in your
comments. :-)

Actually, do feel free to do as much review (and, in case it applies,
send in your reviewed-by tag) as you like and can, either on RTDS or
anywhere else... The project is in great need of that!!

> On Tue, Feb 16, 2016 at 1:11 PM, Dario Faggioli
> <dario.faggioli@xxxxxxxxxx> wrote:
> >Â
> > Note that this was not really a problem if looking
> > at the traces with xenalyze, but it was if using
> > xentrace_format.
> 
> I just have a quick (and perhaps naive) question: :-)
> If xenanlyze works better than xentrace_format, why shouldn't we
> stick
> to xenanlyze?
> Is there some functionality xentrace_format can but xenalyze cannot?
> 
> (I have to confess that I only used xenalyze but didn't use
> xentrace_format before. :-()
>
xenalyze is indeed more advanced, but I don't think this means we
should ignore or neglect xentrace_format: we've got it in tree, so we
should not let it bitrot. I'm not in all our users' heads, so I don't
know whether --and if yes why-- people may prefer the latter over the
former, but I see room for someone wanting something basic and simple,
in some cases.

Actually, I've been in a couple of situations myself, where the raw
output of xentrace_format is easier to consume and, quick-&-dirtily,
post-process, than the much more elaborated one of xenalyze.

For instance, the thing that you can just change on the fly the way a
trace is shown (by tweaking the format file) looks an interesting
feature to me, even considering all the limitations of "pure" xentrace.
And if one want to change the formats for her own purposes, I feel like
it is important that the one that we ship is updated, and can be used
as a decent base for that.

Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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