linux-kernel - Re: [PATCH 7/4] ipc/mqueue: separate mqueue default value from maximum value

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Date:	Wed, 26 Oct 2011 13:31:47 -0400 (EDT)
From:	Doug Ledford <dledford@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
Cc:	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, joe korty <joe.korty@...r.com>,
	amwang@...hat.com
Subject: Re: [PATCH 7/4] ipc/mqueue: separate mqueue default value from maximum value

----- Original Message -----
> commit b231cca438 (message queues: increase range limits)
> changed mqueue default value when attr parameter is specified NULL
> from hard coded value to fs.mqueue.{msg,msgsize}_max sysctl value.
> 
> This made large side effect. When user need to use two mqueue
> applications 1) using !NULL attr parameter and it require big
> message size and 2) using NULL attr parameter and only need small
> size message, app (1) require to raise fs.mqueue.msgsize_max and
> app (2) consume large memory size even though it doesn't need.
> 
> Doug Ledford propsed to switch back it to static hard coded value.
> However it also has a compatibility problem. Some applications might
> started depend on the default value is tunable.
> 
> The solution is to separate default value from maximum value.
> 
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...il.com>
> Cc: Doug Ledford <dledford@...hat.com>
> Cc: Amerigo Wang <amwang@...hat.com>
> Cc: Serge E. Hallyn <serue@...ibm.com>
> Cc: Jiri Slaby <jslaby@...e.cz>
> Cc: Joe Korty <joe.korty@...r.com>

Acked-by: Doug Ledford <dledford@...hat.com>

> ---
>  Documentation/sysctl/fs.txt   |    7 +++++++
>  include/linux/ipc_namespace.h |    3 +++
>  ipc/mq_sysctl.c               |   18 ++++++++++++++++++
>  ipc/mqueue.c                  |    9 ++++++---
>  ipc/msgutil.c                 |    2 ++
>  5 files changed, 36 insertions(+), 3 deletions(-)

-- 
Doug Ledford <dledford@...hat.com>
              GPG KeyID: 0E572FDD
	      http://people.redhat.com/dledford

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