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Re: [Qemu-devel] Should we auto-generate IDs?
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] Should we auto-generate IDs? |
Date: |
Tue, 1 Sep 2015 16:43:32 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Am 01.09.2015 um 16:18 hat Programmingkid geschrieben:
>
> On Sep 1, 2015, at 8:34 AM, Kevin Wolf wrote:
>
> > Am 27.08.2015 um 14:32 hat Jeff Cody geschrieben:
> >> I'm not married to the ID generation scheme I proposed.
> >>
> >> What I am trying to do, however, is have a technical discussion on
> >> generating an ID in a well-formed manner. And hopefully, in a way
> >> that is useful to all interested subsystems, if possible.
> >>
> >> Do you disagree with the requirements I listed above? If so, it would
> >> be useful to begin the discussion around that. For ease of
> >> discussion, I'll list them again:
> >>
> >> * Reserved namespaces
> >> * Uniqueness
> >> * Non-predictable (to avoid inadvertently creating a de facto ABI)
> >>
> >>
> >> . . .
> >>
> >> On the generation scheme proposed above:
> >>
> >> I understand that something you desire is an ID that is easier to
> >> type.
> >>
> >> If we wanted to make it shorter, perhaps we could have the number
> >> counter be variable length:
> >>
> >> qemu#ss#D#XY
> >> | | | |
> >> qemu reserved - | | |
> >> | | |
> >> subsystem name ---| | |
> >> | |
> >> counter --------| |
> >> |
> >> 2-digit random ---|
> >
> > Even with keeping all of the information in there we can shorten the ID
> > a bit more: # at the start is enough to mark it as autogenerated, the
> > subsystem seems nice to have in there anyway, and the # separators can
> > be removed without making the ID less unique (assuming that subsystems
> > never end in a digit). This results in an ID that looks like a three (or
> > more) digit number for the subsystem, where the last two digits are
> > random, like this:
> >
> > #block150
> > #block219
> > #block344
> > ...
> >
> > That seems easy to type and still fulfills all of the criteria.
> >
> > Kevin
>
> I do know that some really want an indicator that shows that an ID is
> auto-generated. But we could still do this and keep the ID short. What if the
> auto-generated ID just started with a character the user could never use at
> the beginning of the ID. I suggest we use an underscore to indicate
> machine-generated ID's. Something like this _1. It is very simple and
> effective.
That's what I already did. # is a reserved character. I don't think
something like #block150 is unreasonably long, it's a bit more
descriptive than _1, and it fulfills all of Jeff's criteria, which _1
clearly doesn't.
Kevin