Re: Devfs, was Re: Migrating to larger numbers
Richard Gooch (rgooch@atnf.csiro.au)
Wed, 9 Jun 1999 17:26:02 +1000
Guest section writes:
> From: Richard Gooch <rgooch@atnf.csiro.au>
>
> However, with devfs you can definately avoid the lookups into the
> major tables. Right now that's fast because they're simple arrays. If
> we go to 12 bit majors (or more), we're going to want to set them up
> as lists of some kind. And that means some kind of searching/hashing.
> And that's all for the benefit of finding our fops. Devfs completely
> avoids this overhead.
>
> No. A kdev_t is a pointer to a structure that has various fields.
> Not:
> blksize[MAJOR(dev)]
> but
> dev->major->blksize
Cute. All, right, if you want to define kdev_t that way, go ahead. It
now has no relation to i_rdev. So once again we go through a lookup.
Regards,
Richard....
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/