From mboxrd@z Thu Jan 1 00:00:00 1970 From: Reza Arbab Subject: [PATCH 0/4] powerpc/mm: movable hotplug memory nodes Date: Mon, 8 Aug 2016 13:27:19 -0500 Message-ID: <1470680843-28702-1-git-send-email-arbab@linux.vnet.ibm.com> Return-path: Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Rob Herring , Mark Rutland , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Jonathan Corbet , Bharata B Rao , Nathan Fontenot , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: devicetree@vger.kernel.org These changes enable onlining memory into ZONE_MOVABLE on power, and the creation of discrete nodes of movable memory. Node hotplug is not supported on power [1]. The approach taken instead is to create a memoryless placeholder node for the designated address range at boot. Hotplug and onlining of the memory are then done in the usual way. The numa code on power currently prevents hotplugging to a memoryless node. This limitation has been questioned before [2], and judging by the response, there doesn't seem to be a reason we can't remove it. No issues have been found in light testing. [1] commit 3af229f ("powerpc/numa: Reset node_possible_map to only node_online_map") [2] http://lkml.kernel.org/r/CAGZKiBrmkSa1yyhbf5hwGxubcjsE5SmkSMY4tpANERMe2UG4bg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org http://lkml.kernel.org/r/20160511215051.GF22115-qNY8G7rN0TWMBe/gKFfDyNwqlRwYtuWJQQ4Iyu8u01E@public.gmane.org Reza Arbab (4): dt-bindings: add doc for ibm,hotplug-aperture powerpc/mm: create numa nodes for hotplug memory powerpc/mm: allow memory hotplug into a memoryless node mm: enable CONFIG_MOVABLE_NODE on powerpc .../bindings/powerpc/opal/hotplug-aperture.txt | 26 ++++++++++++++++++++++ Documentation/kernel-parameters.txt | 2 +- arch/powerpc/mm/numa.c | 23 ++++++++----------- mm/Kconfig | 2 +- 4 files changed, 37 insertions(+), 16 deletions(-) create mode 100644 Documentation/devicetree/bindings/powerpc/opal/hotplug-aperture.txt -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html