linux-kernel - Re: [PATCH] [RFCv2] notify userspace about time changes

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Message-Id: <20100818213947.360b4ce2.akpm@linux-foundation.org>
Date:	Wed, 18 Aug 2010 21:39:47 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Greg KH <gregkh@...e.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Alexander Shishkin <virtuoso@...nd.org>, lkml@...r.kernel.org,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <johnstul@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Jon Hunter <jon-hunter@...com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Avi Kivity <avi@...hat.com>, John Kacur <jkacur@...hat.com>,
	Chris Friesen <chris.friesen@...band.com>,
	Kay Sievers <kay.sievers@...y.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RFCv2] notify userspace about time changes

On Wed, 18 Aug 2010 21:09:37 -0700 Greg KH <gregkh@...e.de> wrote:

> On Wed, Aug 18, 2010 at 04:53:03PM -0700, Andrew Morton wrote:
> > Is sysfs the right interface for this thing?  Bear in mind that
> > CONFIG_SYSFS does exist.  
> > 
> > > +		     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);
> 
> Yeah, that would be much better than a sysfs file, this is abusing the
> sysfs interface quite a lot.
> 

(time_change_notify would be a better syscall name).


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