From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from d01relay04.pok.ibm.com (d01relay04.pok.ibm.com [9.56.227.236]) by e5.ny.us.ibm.com (8.13.8/8.13.8) with ESMTP id l6PFrZZF006488 for ; Wed, 25 Jul 2007 11:53:35 -0400 Received: from d01av03.pok.ibm.com (d01av03.pok.ibm.com [9.56.224.217]) by d01relay04.pok.ibm.com (8.13.8/8.13.8/NCO v8.4) with ESMTP id l6PFrXfg526316 for ; Wed, 25 Jul 2007 11:53:33 -0400 Received: from d01av03.pok.ibm.com (loopback [127.0.0.1]) by d01av03.pok.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id l6PFrXoP012096 for ; Wed, 25 Jul 2007 11:53:33 -0400 Date: Wed, 25 Jul 2007 08:53:32 -0700 From: Nishanth Aravamudan Subject: Re: [PATCH take3] Memoryless nodes: use "node_memory_map" for cpuset mems_allowed validation Message-ID: <20070725155332.GE18510@us.ibm.com> References: <20070711182219.234782227@sgi.com> <20070711182250.005856256@sgi.com> <1185309019.5649.69.camel@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1185309019.5649.69.camel@localhost> Sender: owner-linux-mm@kvack.org Return-Path: To: Lee Schermerhorn Cc: Christoph Lameter , Paul Jackson , akpm@linux-foundation.org, kxr@sgi.com, linux-mm@kvack.org, KAMEZAWA Hiroyuki List-ID: On 24.07.2007 [16:30:19 -0400], Lee Schermerhorn wrote: > Memoryless Nodes: use "node_memory_map" for cpusets - take 3 > > Against 2.6.22-rc6-mm1 atop Christoph Lameter's memoryless nodes > series > > take 2: > + replaced node_online_map in cpuset_current_mems_allowed() > with node_states[N_MEMORY] > + replaced node_online_map in cpuset_init_smp() with > node_states[N_MEMORY] > > take 3: > + fix up comments and top level cpuset tracking of nodes > with memory [instead of on-line nodes]. > + maybe I got them all this time? Looks like it! :) > cpusets try to ensure that any node added to a cpuset's > mems_allowed is on-line and contains memory. The assumption > was that online nodes contained memory. Thus, it is possible > to add memoryless nodes to a cpuset and then add tasks to this > cpuset. This results in continuous series of oom-kill and > apparent system hang. > > Change cpusets to use node_states[N_MEMORY] [a.k.a. > node_memory_map] in place of node_online_map when vetting > memories. Return error if admin attempts to write a non-empty > mems_allowed node mask containing only memoryless-nodes. > > Signed-off-by: Lee Schermerhorn Tested on 4-node ppc64 with 2 memoryless nodes. Top cpuset (and all subsequent ones) only allow nodes 0 and 1 (the nodes with memory). Tested-by: Nishanth Aravamudan Acked-by: Nishanth Aravamudan -- Nishanth Aravamudan IBM Linux Technology Center -- 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/ . Don't email: email@kvack.org