From: Arnd Bergmann <arnd@arndb.de>
To: Pekka Enberg <penberg@kernel.org>
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
Rik van Riel <riel@redhat.com>, Minchan Kim <minchan@kernel.org>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
leonid.moiseichuk@nokia.com, kamezawa.hiroyu@jp.fujitsu.com,
mel@csn.ul.ie, rientjes@google.com,
KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Andrew Morton <akpm@linux-foundation.org>,
Ronen Hod <rhod@redhat.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Subject: Re: [RFC 1/3] /dev/low_mem_notify
Date: Tue, 24 Jan 2012 16:25:55 +0000 [thread overview]
Message-ID: <201201241625.55295.arnd@arndb.de> (raw)
In-Reply-To: <1327420880.13624.24.camel@jaguar>
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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WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: Pekka Enberg <penberg@kernel.org>
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
Rik van Riel <riel@redhat.com>, Minchan Kim <minchan@kernel.org>,
"linux-mm" <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
leonid.moiseichuk@nokia.com, kamezawa.hiroyu@jp.fujitsu.com,
mel@csn.ul.ie, rientjes@google.com,
KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Andrew Morton <akpm@linux-foundation.org>,
Ronen Hod <rhod@redhat.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Subject: Re: [RFC 1/3] /dev/low_mem_notify
Date: Tue, 24 Jan 2012 16:25:55 +0000 [thread overview]
Message-ID: <201201241625.55295.arnd@arndb.de> (raw)
In-Reply-To: <1327420880.13624.24.camel@jaguar>
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
next prev parent reply other threads:[~2012-01-24 16:25 UTC|newest]
Thread overview: 124+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-17 8:13 [RFC 0/3] low memory notify Minchan Kim
2012-01-17 8:13 ` Minchan Kim
2012-01-17 8:13 ` [RFC 1/3] /dev/low_mem_notify Minchan Kim
2012-01-17 8:13 ` Minchan Kim
2012-01-17 9:27 ` Pekka Enberg
2012-01-17 9:27 ` Pekka Enberg
2012-01-17 16:35 ` Rik van Riel
2012-01-17 16:35 ` Rik van Riel
2012-01-17 18:51 ` Pekka Enberg
2012-01-17 18:51 ` Pekka Enberg
2012-01-17 19:30 ` Rik van Riel
2012-01-17 19:30 ` Rik van Riel
2012-01-17 19:49 ` Pekka Enberg
2012-01-17 19:49 ` Pekka Enberg
2012-01-17 19:54 ` Pekka Enberg
2012-01-17 19:54 ` Pekka Enberg
2012-01-17 19:57 ` Pekka Enberg
2012-01-17 19:57 ` Pekka Enberg
2012-01-17 23:20 ` Minchan Kim
2012-01-17 23:20 ` Minchan Kim
2012-01-18 7:16 ` Pekka Enberg
2012-01-18 7:16 ` Pekka Enberg
2012-01-18 7:49 ` Minchan Kim
2012-01-18 7:49 ` Minchan Kim
2012-01-18 9:06 ` leonid.moiseichuk
2012-01-18 9:06 ` leonid.moiseichuk
2012-01-18 9:15 ` Pekka Enberg
2012-01-18 9:15 ` Pekka Enberg
2012-01-18 9:41 ` leonid.moiseichuk
2012-01-18 9:41 ` leonid.moiseichuk
2012-01-18 10:40 ` Pekka Enberg
2012-01-18 10:40 ` Pekka Enberg
2012-01-18 10:44 ` leonid.moiseichuk
2012-01-18 10:44 ` leonid.moiseichuk
2012-01-18 23:34 ` Ronen Hod
2012-01-18 23:34 ` Ronen Hod
2012-01-19 7:25 ` Pekka Enberg
2012-01-19 7:25 ` Pekka Enberg
2012-01-19 9:05 ` Ronen Hod
2012-01-19 9:05 ` Ronen Hod
2012-01-19 9:10 ` Pekka Enberg
2012-01-19 9:10 ` Pekka Enberg
2012-01-19 9:20 ` Ronen Hod
2012-01-19 9:20 ` Ronen Hod
2012-01-19 10:53 ` leonid.moiseichuk
2012-01-19 10:53 ` leonid.moiseichuk
2012-01-19 11:07 ` Pekka Enberg
2012-01-19 11:07 ` Pekka Enberg
2012-01-19 11:54 ` leonid.moiseichuk
2012-01-19 11:54 ` leonid.moiseichuk
2012-01-19 11:59 ` Pekka Enberg
2012-01-19 11:59 ` Pekka Enberg
2012-01-19 12:06 ` Pekka Enberg
2012-01-19 12:06 ` Pekka Enberg
2012-01-24 15:38 ` Marcelo Tosatti
2012-01-24 15:38 ` Marcelo Tosatti
2012-01-24 16:08 ` Ronen Hod
2012-01-24 16:08 ` Ronen Hod
2012-01-24 18:10 ` Marcelo Tosatti
2012-01-24 18:10 ` Marcelo Tosatti
2012-01-25 8:52 ` Ronen Hod
2012-01-25 8:52 ` Ronen Hod
2012-01-25 10:12 ` Marcelo Tosatti
2012-01-25 10:12 ` Marcelo Tosatti
2012-01-25 10:48 ` Ronen Hod
2012-01-25 10:48 ` Ronen Hod
2012-01-26 16:17 ` Marcelo Tosatti
2012-01-26 16:17 ` Marcelo Tosatti
2012-01-24 16:10 ` Pekka Enberg
2012-01-24 16:10 ` Pekka Enberg
2012-01-24 18:29 ` Marcelo Tosatti
2012-01-24 18:29 ` Marcelo Tosatti
2012-01-25 8:19 ` leonid.moiseichuk
2012-01-25 8:19 ` leonid.moiseichuk
2012-01-19 7:34 ` Pekka Enberg
2012-01-19 7:34 ` Pekka Enberg
2012-01-24 16:22 ` Arnd Bergmann
2012-01-24 16:22 ` Arnd Bergmann
2012-01-18 14:30 ` Rik van Riel
2012-01-18 14:30 ` Rik van Riel
2012-01-18 15:29 ` Pekka Enberg
2012-01-18 15:29 ` Pekka Enberg
2012-01-24 15:40 ` Marcelo Tosatti
2012-01-24 15:40 ` Marcelo Tosatti
2012-01-24 16:01 ` Pekka Enberg
2012-01-24 16:01 ` Pekka Enberg
2012-01-24 16:25 ` Arnd Bergmann [this message]
2012-01-24 16:25 ` Arnd Bergmann
2012-01-24 18:32 ` Marcelo Tosatti
2012-01-24 18:32 ` Marcelo Tosatti
2012-01-24 21:57 ` Jonathan Corbet
2012-01-24 21:57 ` Jonathan Corbet
2012-01-17 9:45 ` Pekka Enberg
2012-01-17 9:45 ` Pekka Enberg
2012-01-17 8:13 ` [RFC 2/3] vmscan hook Minchan Kim
2012-01-17 8:13 ` Minchan Kim
2012-01-17 8:39 ` KAMEZAWA Hiroyuki
2012-01-17 8:39 ` KAMEZAWA Hiroyuki
2012-01-17 9:13 ` Minchan Kim
2012-01-17 9:13 ` Minchan Kim
2012-01-17 10:05 ` KAMEZAWA Hiroyuki
2012-01-17 10:05 ` KAMEZAWA Hiroyuki
2012-01-17 23:08 ` Minchan Kim
2012-01-17 23:08 ` Minchan Kim
2012-01-18 0:18 ` KAMEZAWA Hiroyuki
2012-01-18 0:18 ` KAMEZAWA Hiroyuki
2012-01-18 14:17 ` Rik van Riel
2012-01-18 14:17 ` Rik van Riel
2012-01-19 2:25 ` KAMEZAWA Hiroyuki
2012-01-19 2:25 ` KAMEZAWA Hiroyuki
2012-01-19 14:42 ` Rik van Riel
2012-01-19 14:42 ` Rik van Riel
2012-01-20 0:24 ` KAMEZAWA Hiroyuki
2012-01-20 0:24 ` KAMEZAWA Hiroyuki
2012-01-17 8:13 ` [RFC 3/3] test program Minchan Kim
2012-01-17 8:13 ` Minchan Kim
2012-01-17 14:38 ` [RFC 0/3] low memory notify Colin Walters
2012-01-17 14:38 ` Colin Walters
2012-01-17 15:04 ` Pekka Enberg
2012-01-17 15:04 ` Pekka Enberg
2012-01-17 16:44 ` Rik van Riel
2012-01-17 16:44 ` Rik van Riel
2012-01-17 17:16 ` Olof Johansson
2012-01-17 17:16 ` Olof Johansson
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