On Sun, Nov 18, 2007 at 01:05:03PM -0800, Andrew Morton wrote:
> On Sun, 18 Nov 2007 20:38:21 +0100 Helge Deller <[email protected]> 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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
