From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yk0-f171.google.com (mail-yk0-f171.google.com [209.85.160.171]) by kanga.kvack.org (Postfix) with ESMTP id 562B66B0031 for ; Tue, 28 Jan 2014 13:35:09 -0500 (EST) Received: by mail-yk0-f171.google.com with SMTP id 142so3369772ykq.2 for ; Tue, 28 Jan 2014 10:35:09 -0800 (PST) Received: from e37.co.us.ibm.com (e37.co.us.ibm.com. [32.97.110.158]) by mx.google.com with ESMTPS id f25si12384768yho.178.2014.01.28.10.35.07 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Tue, 28 Jan 2014 10:35:08 -0800 (PST) Received: from /spool/local by e37.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 28 Jan 2014 11:35:07 -0700 Received: from b03cxnp08025.gho.boulder.ibm.com (b03cxnp08025.gho.boulder.ibm.com [9.17.130.17]) by d03dlp01.boulder.ibm.com (Postfix) with ESMTP id 89EDFC40002 for ; Tue, 28 Jan 2014 11:35:03 -0700 (MST) Received: from d03av02.boulder.ibm.com (d03av02.boulder.ibm.com [9.17.195.168]) by b03cxnp08025.gho.boulder.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id s0SIZ3eL3604790 for ; Tue, 28 Jan 2014 19:35:03 +0100 Received: from d03av02.boulder.ibm.com (localhost [127.0.0.1]) by d03av02.boulder.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id s0SIZ2io022993 for ; Tue, 28 Jan 2014 11:35:03 -0700 Date: Tue, 28 Jan 2014 10:34:57 -0800 From: Nishanth Aravamudan Subject: [PATCH] powerpc: enable CONFIG_HAVE_MEMORYLESS_NODES Message-ID: <20140128183457.GA9315@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: owner-linux-mm@kvack.org List-ID: To: Christoph Lameter Cc: Anton Blanchard , Wanpeng Li , David Rientjes , Joonsoo Kim , Pekka Enberg , Matt Mackall , Ben Herrenschmidt , Paul Mackerras , linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org Anton Blanchard found an issue with an LPAR that had no memory in Node 0. Christoph Lameter recommended, as one possible solution, to use numa_mem_id() for locality of the nearest memory node-wise. However, numa_mem_id() [and the other related APIs] are only useful if CONFIG_HAVE_MEMORYLESS_NODES is set. This is only the case for ia64 currently, but clearly we can have memoryless nodes on ppc64. Add the Kconfig option and define it to be the same value as CONFIG_NUMA. On the LPAR in question, which was very inefficiently using slabs, this took the slab consumption at boot from roughly 7GB to roughly 4GB. --- Ben, the only question I have wrt this change is if it's appropriate to change it for all powerpc configs (that have NUMA on)? diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 25493a0..bb2d5fe 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -447,6 +447,9 @@ config NODES_SHIFT default "4" depends on NEED_MULTIPLE_NODES +config HAVE_MEMORYLESS_NODES + def_bool NUMA + config ARCH_SELECT_MEMORY_MODEL def_bool y depends on PPC64 -- 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