Messages in this thread |  | | | Date | Tue, 25 Mar 2008 14:26:45 -0700 | | From | "H. Peter Anvin" <> | | Subject | Re: What to do about the 2TB limit on HDIO_GETGEO ? |
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Greg KH wrote: > On Tue, Mar 25, 2008 at 01:36:51PM -0700, H. Peter Anvin wrote: >> Randy Dunlap wrote: >>>> Come on people, adding symlinks for device major:minor numbers in sysfs >>>> to save a few 10s of lines of userspace code? Can things get sillier? >>>> >>>> You can add a single udev rule to probably build these in a tree in /dev >>>> if you really need such a thing... >>>> >>>> And what's wrong with your new ioctl recomendation? >>> Ah, there's some sanity. :) >> It's not so much an issue of a few tens of lines of user space code, but >> rather the fact that something that should be O(1) is currently O(n). > > "should"? why? Is this some new requirement that everyone needs? I've > _never_ seen anyone ask for the ability to find sysfs devices by > major:minor number in O(1) time. Is this somehow a place where such > optimization is warranted?
Well, when dealing with shell scripts a O(n) very easily becomes O(n^2). For the stuff that I, personally, do, it's not a big deal, but people with large number of disks have serious gripes with our boot times.
-hpa
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