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

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Message-ID: <AANLkTi=svKLEJ546kmP4WEaut=hGeFnHyw8a-uxjBAOt@mail.gmail.com>
Date:	Thu, 19 Aug 2010 10:39:40 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Alexander Shishkin <virtuoso@...nd.org>, lkml@...r.kernel.org,
	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>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RFCv2] notify userspace about time changes

On Thu, Aug 19, 2010 at 10:36, Kirill A. Shutemov <kirill@...temov.name> wrote:
> On Wed, Aug 18, 2010 at 09:09:37PM -0700, Greg KH 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.
>
> Do you really think, that increasing number of syscalls is better then
> fs-based interfaces?

Not necessarily, but adding such, and from the outside scope 'random
stuff', to /sys/kernel/ is really not the way to do such things.

It seems to be new dumping ground for things that don't have an
obvious home, and since proc is out of fashion. :)

Can't timerfd be used, or extended in some way? It really sounds like
the place this should happen.

Kay
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