From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx162.postini.com [74.125.245.162]) by kanga.kvack.org (Postfix) with SMTP id 435C66B004F for ; Tue, 24 Jan 2012 13:34:49 -0500 (EST) Date: Tue, 24 Jan 2012 16:32:47 -0200 From: Marcelo Tosatti Subject: Re: [RFC 1/3] /dev/low_mem_notify Message-ID: <20120124183247.GA19853@amt.cnet> References: <1326788038-29141-1-git-send-email-minchan@kernel.org> <20120124154001.GB10990@amt.cnet> <1327420880.13624.24.camel@jaguar> <201201241625.55295.arnd@arndb.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <201201241625.55295.arnd@arndb.de> Sender: owner-linux-mm@kvack.org List-ID: To: Arnd Bergmann Cc: Pekka Enberg , Rik van Riel , Minchan Kim , linux-mm , LKML , leonid.moiseichuk@nokia.com, kamezawa.hiroyu@jp.fujitsu.com, mel@csn.ul.ie, rientjes@google.com, KOSAKI Motohiro , Johannes Weiner , Andrew Morton , Ronen Hod , KOSAKI Motohiro 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org