From: Peter Zijlstra <peterz@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Alexander Shishkin <virtuoso@slind.org>,
lkml@vger.kernel.org, "Kirill A. Shutemov" <kirill@shutemov.name>,
Thomas Gleixner <tglx@linutronix.de>,
John Stultz <johnstul@us.ibm.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Jon Hunter <jon-hunter@ti.com>, Ingo Molnar <mingo@elte.hu>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
David Howells <dhowells@redhat.com>, Avi Kivity <avi@redhat.com>,
John Kacur <jkacur@redhat.com>,
Chris Friesen <chris.friesen@genband.com>,
Kay Sievers <kay.sievers@vrfy.org>, Greg KH <gregkh@suse.de>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [RFCv2] notify userspace about time changes
Date: Thu, 19 Aug 2010 11:50:46 +0200 [thread overview]
Message-ID: <1282211446.1926.4609.camel@laptop> (raw)
In-Reply-To: <20100818165303.dd52695a.akpm@linux-foundation.org>
On Wed, 2010-08-18 at 16:53 -0700, Andrew Morton wrote:
>
>
> Such applications might be better served via a wake-me-at-this-time
> syscall instead of a sleep-me-for-this-long syscall. Although such a
> thing is less general.
>
We have timer_create(.clockid = CLOCK_REALTIME) for such things, no?
> > + fd = open("/sys/kernel/time_notify", O_WRONLY);
> > + fdprintf(fd, "%d 1 0 1 1", efd);
>
> why not
>
> sys_time_notify(efd, 1, 0, 1, 1);
And then there is the /dev/time proposal from Plan9:
http://lkml.org/lkml/2009/3/11/363
Their proposal was to add a poll() method to the device which would wake
on every change in time.
next prev parent reply other threads:[~2010-08-19 9:51 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-18 13:55 [PATCH] [RFCv2] notify userspace about time changes Alexander Shishkin
2010-08-18 14:26 ` Greg KH
2010-08-18 22:57 ` Andrew Morton
2010-08-18 23:43 ` H. Peter Anvin
2010-08-18 23:53 ` Andrew Morton
2010-08-19 4:09 ` Greg KH
2010-08-19 4:39 ` Andrew Morton
2010-08-19 8:21 ` Alexander Shishkin
2010-08-19 8:36 ` Kirill A. Shutemov
2010-08-19 8:39 ` Kay Sievers
2010-08-19 15:31 ` Greg KH
2010-08-20 8:37 ` Kirill A. Shutemov
2010-08-20 15:33 ` Greg KH
2010-08-20 15:38 ` Alexander Shishkin
2010-08-19 9:50 ` Peter Zijlstra [this message]
2010-08-19 10:53 ` Kay Sievers
2010-08-19 11:14 ` Alexander Shishkin
2010-08-18 23:50 ` Chris Friesen
2010-08-18 23:09 ` john stultz
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