From: "H. Peter Anvin" <hpa@zytor.com>
To: Kay Sievers <kay.sievers@vrfy.org>
Cc: Greg KH <gregkh@suse.de>, john stultz <johnstul@us.ibm.com>,
Alexander Shishkin <virtuoso@slind.org>,
lkml@vger.kernel.org, "Kirill A. Shutemov" <kirill@shutemov.name>,
Thomas Gleixner <tglx@linutronix.de>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Jon Hunter <jon-hunter@ti.com>, Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
David Howells <dhowells@redhat.com>, Avi Kivity <avi@redhat.com>,
John Kacur <jkacur@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [RFC] notify userspace about time changes
Date: Thu, 05 Aug 2010 15:34:13 -0700 [thread overview]
Message-ID: <4C5B3C65.8060703@zytor.com> (raw)
In-Reply-To: <AANLkTimYmtXZe1Ue-z2D_5512RXz3xUSRWPiUUUY6rrz@mail.gmail.com>
On 08/05/2010 03:22 PM, Kay Sievers wrote:
>
> I think that's really awkward interface, to pass file descriptor
> numbers around and write them to magic sysfs files.
>
> I would very much prefer a file that contains the current time, and
> wakes up possible users with a POLL_ERR on changes caused by some
> other process. That works very well for things like /proc/mounts, is
> easy to get, and does not need a full page of weird instructions to
> get stuff done. :)
>
Okay, what's wrong with having a file descriptor that gets *written to*
on a notification? Why POLL_ERR?
-hpa
next prev parent reply other threads:[~2010-08-05 22:35 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-04 12:48 [PATCH] [RFC] notify userspace about time changes Alexander Shishkin
2010-08-04 12:54 ` Bastien ROUCARIES
2010-08-04 15:49 ` Alexander Shishkin
[not found] ` <1280926108-24668-1-git-send-email-virtuoso-0lOfPCoBze7YtjvyW6yDsg@public.gmane.org>
2010-08-04 15:32 ` Kirill A. Shutemov
2010-08-04 15:32 ` Kirill A. Shutemov
2010-08-04 15:46 ` Alexander Shishkin
2010-08-05 10:05 ` Kirill A. Shutemov
2010-08-04 15:58 ` john stultz
2010-08-04 18:48 ` Chris Friesen
2010-08-05 0:52 ` john stultz
2010-08-05 12:39 ` Alexander Shishkin
2010-08-05 14:10 ` Chris Friesen
2010-08-05 12:33 ` Alexander Shishkin
2010-08-05 21:11 ` john stultz
2010-08-05 21:38 ` Greg KH
2010-08-05 22:22 ` Kay Sievers
2010-08-05 22:34 ` H. Peter Anvin [this message]
2010-08-05 22:39 ` Kay Sievers
2010-08-05 22:43 ` H. Peter Anvin
2010-08-05 22:38 ` Greg KH
2010-08-06 7:21 ` Alexander Shishkin
2010-08-06 23:44 ` Greg KH
2010-08-06 7:11 ` Alexander Shishkin
2010-08-06 7:43 ` Bastien ROUCARIES
2010-08-05 22:17 ` Kay Sievers
2010-08-05 22:29 ` john stultz
2010-08-05 22:30 ` john stultz
2010-08-05 23:50 ` Kay Sievers
2010-08-06 0:16 ` john stultz
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