linux-kernel - Re: [RFC 1/3] /dev/low_mem

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Message-ID: <20120124183247.GA19853@amt.cnet>
Date:	Tue, 24 Jan 2012 16:32:47 -0200
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Pekka Enberg <penberg@...nel.org>, Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan@...nel.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, leonid.moiseichuk@...ia.com,
	kamezawa.hiroyu@...fujitsu.com, mel@....ul.ie, rientjes@...gle.com,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ronen Hod <rhod@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [RFC 1/3] /dev/low_mem_notify

On Tue, Jan 24, 2012 at 04:25:55PM +0000, Arnd Bergmann wrote:
> On Tuesday 24 January 2012, Pekka Enberg wrote:
> > On Tue, 2012-01-24 at 13:40 -0200, Marcelo Tosatti wrote:
> > > What is the practical advantage of a syscall, again?
> > 
> > Why do you ask? The advantage for this particular case is not needing to
> > add ioctls() for configuration and keeping the file read/write ABI
> > simple.
> 
> The two are obviously equivalent and there is no reason to avoid
> ioctl in general. However I agree that the syscall would be better
> in this case, because that is what we tend to use for core kernel
> functionality, while character devices tend to be used for I/O device
> drivers that need stuff like enumeration and permission management.
> 
> 	Arnd

Makes sense.

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