From: Greg KH <gregkh@suse.de>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>, Mark Lord <lkml@rtr.ca>,
Jens Axboe <axboe@kernel.dk>, Jeff Garzik <jgarzik@pobox.com>,
Tejun Heo <htejun@gmail.com>, Linus Torvalds <torvalds@osdl.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linux Kernel <linux-kernel@vger.kernel.org>,
IDE/ATA development list <linux-ide@vger.kernel.org>,
linux-scsi <linux-scsi@vger.kernel.org>
Subject: Re: What to do about the 2TB limit on HDIO_GETGEO ?
Date: Tue, 25 Mar 2008 14:20:32 -0700 [thread overview]
Message-ID: <20080325212032.GA24495@suse.de> (raw)
In-Reply-To: <47E96263.9000808@zytor.com>
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?
thanks,
greg k-h
next prev parent reply other threads:[~2008-03-25 21:22 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <47E875AD.1000901@rtr.ca>
2008-03-25 4:02 ` What to do about the 2TB limit on HDIO_GETGEO ? Mark Lord
2008-03-25 4:19 ` Andrew Morton
2008-03-25 5:13 ` H. Peter Anvin
2008-03-25 13:37 ` Mark Lord
2008-03-25 13:55 ` H. Peter Anvin
2008-03-25 17:37 ` Mark Lord
2008-03-25 19:25 ` Greg KH
2008-03-25 19:34 ` Randy Dunlap
2008-03-25 20:36 ` H. Peter Anvin
2008-03-25 21:20 ` Greg KH [this message]
2008-03-25 21:26 ` H. Peter Anvin
2008-03-25 23:00 ` Greg KH
2008-03-25 23:05 ` H. Peter Anvin
2008-03-25 23:22 ` Greg KH
2008-03-27 19:05 ` Matthew Wilcox
2008-03-26 0:34 ` Mark Lord
2008-03-26 0:54 ` Tejun Heo
2008-03-26 3:38 ` Greg KH
2008-03-26 4:24 ` Tejun Heo
2008-03-26 6:04 ` H. Peter Anvin
2008-03-27 19:29 ` Kay Sievers
2008-03-27 19:38 ` H. Peter Anvin
2008-04-11 23:25 ` Dan Williams
2008-04-15 7:18 ` Andrew Morton
2008-04-15 13:47 ` Mark Lord
2008-04-15 14:20 ` James Bottomley
2008-04-15 18:16 ` H. Peter Anvin
2008-04-15 23:43 ` Dan Williams
2008-04-16 20:55 ` patch sysfs-add-sys-dev-char-block-to-lookup-sysfs-path-by-major-minor.patch added to gregkh-2.6 tree gregkh
2008-04-16 20:55 ` gregkh
2008-04-16 20:55 ` gregkh
2008-03-27 18:51 ` What to do about the 2TB limit on HDIO_GETGEO ? Kay Sievers
2008-03-27 18:55 ` H. Peter Anvin
2008-03-27 19:03 ` Kay Sievers
2008-03-25 15:17 ` James Bottomley
2008-03-25 17:31 ` Mark Lord
2008-03-25 19:32 ` James Bottomley
2008-03-25 17:45 ` Greg Freemyer
2008-03-25 17:52 ` Randy Dunlap
2008-03-25 18:09 ` Matthew Wilcox
2008-03-26 9:58 ` Boaz Harrosh
2008-03-30 4:28 ` Matt Domsch
[not found] ` <alpine.LFD.1.00.0803242254020.2775@woody.linux-foundation.org>
2008-03-25 13:34 ` Mark Lord
2008-03-25 13:51 ` Greg Freemyer
2008-03-25 14:31 ` Ric Wheeler
2008-03-25 15:25 ` Andrew Paprocki
2008-03-25 15:34 ` Matthew Wilcox
2008-03-25 15:48 ` Ric Wheeler
2008-03-25 16:47 ` Theodore Tso
2008-03-25 20:51 ` Theodore Tso
2008-03-25 20:51 ` Theodore Tso
2008-03-25 20:51 ` Theodore Tso
[not found] <abhxL-xC-7@gated-at.bofh.it>
[not found] ` <abhRd-1bf-15@gated-at.bofh.it>
[not found] ` <ablib-2zv-65@gated-at.bofh.it>
[not found] ` <abn0B-735-35@gated-at.bofh.it>
[not found] ` <abna7-7jK-3@gated-at.bofh.it>
[not found] ` <abo6b-11J-9@gated-at.bofh.it>
[not found] ` <aboSP-2Wf-29@gated-at.bofh.it>
[not found] ` <aboSP-2Wf-27@gated-at.bofh.it>
[not found] ` <abqrq-6eX-29@gated-at.bofh.it>
[not found] ` <abqrq-6eX-27@gated-at.bofh.it>
[not found] ` <abqKM-6Ka-13@gated-at.bofh.it>
2008-03-26 11:30 ` Bodo Eggert
2008-03-26 11:30 ` Bodo Eggert
2008-03-26 11:30 ` Bodo Eggert
2008-03-27 3:52 ` Greg KH
2008-03-27 4:57 ` H. Peter Anvin
2008-03-27 14:45 ` Mark Lord
2008-03-27 15:15 ` Greg KH
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