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SubjectRe: [PATCH] Time-based RFC 4122 UUID generator
On Sun, Nov 18, 2007 at 01:05:03PM -0800, Andrew Morton wrote:
> On Sun, 18 Nov 2007 20:38:21 +0100 Helge Deller <deller@gmx.de> wrote:
>
> > Title: Add time-based RFC 4122 UUID generator
> >
> > The current Linux kernel currently contains the generate_random_uuid()
> > function, which creates - based on RFC 4122 - truly random UUIDs and
> > provides them to userspace through /proc/sys/kernel/random/boot_id and
> > /proc/sys/kernel/random/uuid.
> >
> > This patch additionally adds the "Time-based UUID" variant of RFC 4122,
> > with which userspace applications can easily get real unique time-based
> > UUIDs through /proc/sys/kernel/random/uuid_time.
> > A new /proc/sys/kernel/random/uuid_time_clockseq sysfs entry is available,
> > so that the clock_seq value can be retained across system bootups (which
> > is required by RFC 4122).
> >
> > The attached implementation uses getnstimeofday() to get very fine-grained
> > granularity. This helps, so that userspace tools can get a lot more UUIDs
> > (if needed) per time than before.
> > A mutex takes care of the proper locking against a mistaken double creation
> > of UUIDs for simultanious running processes.
>
> Who will use this feature, and for what?
>
> (In fact, who uses the existing UUID generators, and for what?)

I use libuuid and I assume libuuid uses some uuid generator support
from the kernel. libuuid comes from a package that Ted's maintain IIRC.

I (my company) use uuid to uniquely identify objects in a distributed
database.
[Proprietary closed source stuff].

Sam
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