[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH v2] Show values and description when using "qom-
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH v2] Show values and description when using "qom-list" |
Date: |
Mon, 25 Jun 2018 16:00:57 +0100 |
User-agent: |
Mutt/1.10.0 (2018-05-17) |
* Markus Armbruster (address@hidden) wrote:
> Markus Armbruster <address@hidden> writes:
>
> > Andreas Färber <address@hidden> writes:
> >
> >> Am 08.06.2018 um 11:41 schrieb Dr. David Alan Gilbert:
> >>> * Andreas Färber (address@hidden) wrote:
> >>>> Am 01.06.2018 um 17:39 schrieb Ricardo Perez Blanco:
> >>>>> For debugging purposes it is very useful to:
> >>>>> - See the description of the field. This information is already filled
> >>>>> in but not shown in "qom-list" command.
> >>>>
> >>>> No objection on this part.
> >>>>
> >>>>> - Display value of the field.
> >>>>
> >>>> That is by definition the qom-get operation, not qom-list. Just like the
> >>>> ls command does not show file contents, there's cat etc. for that. For
> >>>> debugging purposes we had a qom-tree (?) command that would combine
> >>>> both.
> >>>
> >>> I'm not too bothered about distinguishing between the two commands;
> >>> but it would be nice
> >
> > When an HMP and QMP both have a command with the same name, they should
> > do the same.
> >
> > HMP may add convenience features that aren't wanted in QMP, but I feel
> > extending an operation to list objects to also show their contents goes
> > beyond that. If we want an HMP command that does both, it should be
> > named differently. Perhaps that might even be more appropriate for HMP
> > than low-level commands qom-list and qom-get, but I leave that to the
> > HMP maintainer to decide.
> >
> >>> - one reason I'm not too bothered is because we've
> >>> failed to get a qom-get in multiple years of trying.
> >
> > We clearly haven't tried hard enough.
> >
> > If we can figure out how to show values in qom-list, surely we can
> > figure out how to show them in qom-get.
> >
> >>>> There might be unmerged patches on qemu-devel related to display
> >>>> of certain data types.
> >>>
> >>> Which ones?
> >>
> >> My original qom-info series needed StringOutputVisitor changes for enums
> >> (test case: rtc) that did not get accepted immediately and thus some
> >> part of HMP qom-info/qom-get got stuck due to risking assertions for
> >> qom-info / otherwise; QMP was not affected IIRC.
> >
> > Here's the last try I can find:
> > [PATCH v2] qom: Implement qom-get HMP command
> > Message-Id: <address@hidden>
> > https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg01041.html
>
> Stalled on output format and consistency with qom-set. I wrote back
> then "We can take qom-get as is and improve its output later." I'd like
> to encourage you to dust it off. Perfect's the enemy of good.
>
> Wanted improvements include:
>
> * Prettier output format. I'd suggest creating a keyval variant of the
> output visitor.
I'm not too bothered about pretty at first, as long as we don't stop
anyway of making it pretty later; especially if non-compound types work
well.
> * Make qom-set input format consistent by switching to the matching
> input visitor.
>
> > Its v1 tries a different approach:
> > [PATCH 0/2] qom-get [for 2.8]
> > Message-Id: <address@hidden>
> > Unfortunately the mailing list archive doesn't show the full thread, so
> > you get to follow three links:
> > https://lists.gnu.org/archive/html/qemu-devel/2016-08/msg03815.html
> > https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg04261.html
> > https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg04267.html
>
> This one stalled on string visitor limitations. You didn't feel like
> addressing them just to get qom-get working. Understandable.
Have there been any changes in the last 2 years that have helped?
Dave
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- [Qemu-devel] [PATCH v2] Show values and description when using "qom-list", Ricardo Perez Blanco, 2018/06/01
- Re: [Qemu-devel] [PATCH v2] Show values and description when using "qom-list", Eric Blake, 2018/06/01
- Re: [Qemu-devel] [PATCH v2] Show values and description when using "qom-list", Andreas Färber, 2018/06/02
- Re: [Qemu-devel] [PATCH v2] Show values and description when using "qom-list", Dr. David Alan Gilbert, 2018/06/08
- Re: [Qemu-devel] [PATCH v2] Show values and description when using "qom-list", Andreas Färber, 2018/06/08
- Re: [Qemu-devel] [PATCH v2] Show values and description when using "qom-list", Perez Blanco, Ricardo (Nokia - BE/Antwerp), 2018/06/11
- Re: [Qemu-devel] [PATCH v2] Show values and description when using "qom-list", Markus Armbruster, 2018/06/12
- Re: [Qemu-devel] [PATCH v2] Show values and description when using "qom-list", Markus Armbruster, 2018/06/25
- Re: [Qemu-devel] [PATCH v2] Show values and description when using "qom-list",
Dr. David Alan Gilbert <=
- Re: [Qemu-devel] [PATCH v2] Show values and description when using "qom-list", Markus Armbruster, 2018/06/25
- Re: [Qemu-devel] [PATCH v2] Show values and description when using "qom-list", Dr. David Alan Gilbert, 2018/06/29
- Re: [Qemu-devel] [PATCH v2] Show values and description when using "qom-list", Perez Blanco, Ricardo (Nokia - BE/Antwerp), 2018/06/29