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

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Message-Id: <201201241625.55295.arnd@arndb.de>
Date:	Tue, 24 Jan 2012 16:25:55 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>,
	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 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
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