linux-kernel - Re: [RFC][PATCH] syctl for selecting global zonelist[] order

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 25 Apr 2007 12:17:15 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	LKML <linux-kernel@...r.kernel.org>, Linux-MM <linux-mm@...ck.org>,
	GOTO <y-goto@...fujitsu.com>
Subject: Re: [RFC][PATCH] syctl for selecting global zonelist[] order

On Wed, 25 Apr 2007, KAMEZAWA Hiroyuki wrote:

> Make zonelist policy selectable from sysctl.
> 
> Assume 2 node NUMA, only node(0) has ZONE_DMA (ZONE_DMA32).
> 
> In this case, default (node0's) zonelist order is
> 
> Node(0)'s NORMAL -> Node(0)'s DMA -> Node(1)"s NORMAL.
> 
> This means Node(0)'s DMA is used before Node(1)'s NORMAL.

So a IA64 platform with i386 sicknesses? And pretty bad case of it since I 
assume that the memory sizes per node are equal. Your solution of taking 
4G off node 0 and then going to node 1 first must hurt some 
processes running on node 0. But there is no easy solution since 
the hardware is badly screwed up with 32 bit I/O. Whatever you do the 
memory balance between the two nodes is making the system behave in
an unsymmetric way.

> In some server, some application uses large memory allcation.
> This exhaust memory in the above order.

Could we add a boot time option instead that changes the zonelist build 
behavior? Maybe an arch hook that can deal with it?
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/