linux-kernel - [PATCH 0/3] ipc: Further updates to sysv/mqueue limits

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Date:	Tue, 12 Aug 2014 09:29:14 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Rafael Aquini <aquini@...hat.com>,
	Rik van Riel <riel@...hat.com>, 1vier1@....de,
	Manfred Spraul <manfred@...orfullife.com>
Subject: [PATCH 0/3] ipc: Further updates to sysv/mqueue limits

Hi Andrew,

I got some positive and no negative feedback on my patches, thus:
Could you add the patches to -mm and push them towards Linus?

0001-ipc-msg-increase-MSGMNI-remove-scaling.patch
	- increase MSGMNI to 32000
	- as a bonus, this removes around 300 lines

0002-ipc-sem.c-increase-SEMMSL-SEMMNI-SEMOPM.patch
	- increase all limits
	- update the documentation, it was stale

   Note: Redhat/Oracle recommend values that exceed what I would recommend
   as safe upper limits.
 
https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Tuning_and_Optimizing_Red_Hat_Enterprise_Linux_for_Oracle_9i_and_10g_Databases/sect-Oracle_9i_and_10g_Tuning_Guide-Setting_Semaphores-An_Example_of_Semaphore_Settings.html 

   Unfortunately I didn't get any replies, thus I don't know how to proceed.

   One option would be to switch from kmalloc to ipc_alloc, then the risk of
   failing due to memory fragmentation would be resolved.

0003-ipc-namespace-copy-settings-from-parent-namespace.patch
	Change the namespace code so that a new namespace inherits the values
	from it's parent instead of the boot time defaults.

	Serge Hallyn and Michael Kerrisk also consider the new approach as better.
	One thing that is a bit surprising is that clone(CLONE_NEWIPC)k

I've tested the changes both with unshare -i and with my own test apps.
Unfortunately I didn't manage to get lxc to run on my busybox test setup :-(

--
	Manfred
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