From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qg0-f43.google.com (mail-qg0-f43.google.com [209.85.192.43]) by kanga.kvack.org (Postfix) with ESMTP id C71E3828DF for ; Tue, 12 Jan 2016 11:56:26 -0500 (EST) Received: by mail-qg0-f43.google.com with SMTP id 6so354678990qgy.1 for ; Tue, 12 Jan 2016 08:56:26 -0800 (PST) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id a197si43991412qkb.6.2016.01.12.08.56.25 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 12 Jan 2016 08:56:25 -0800 (PST) From: Vitaly Kuznetsov Subject: [PATCH v4 0/2] memory-hotplug: add automatic onlining policy for the newly added memory Date: Tue, 12 Jan 2016 17:56:15 +0100 Message-Id: <1452617777-10598-1-git-send-email-vkuznets@redhat.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: Jonathan Corbet , Greg Kroah-Hartman , Daniel Kiper , Dan Williams , Tang Chen , David Vrabel , David Rientjes , Andrew Morton , Naoya Horiguchi , Xishi Qiu , Mel Gorman , "K. Y. Srinivasan" , Igor Mammedov , Kay Sievers , Konrad Rzeszutek Wilk , Boris Ostrovsky , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org Changes since v3: - Add support for the policy to Xen balloon driver [Daniel Kiper, David Vrabel] - I found an issue with PATCH v3: when memory auto onlining was requested we do nothing to memblocks states so in sysfs they stay 'offline' (while in reality they're online). Modify register_new_memory() (and its only caller, __add_section()) to create memblocks in the proper state. Original description: Currently, all newly added memory blocks remain in 'offline' state unless someone onlines them, some linux distributions carry special udev rules like: SUBSYSTEM=="memory", ACTION=="add", ATTR{state}=="offline", ATTR{state}="online" to make this happen automatically. This is not a great solution for virtual machines where memory hotplug is being used to address high memory pressure situations as such onlining is slow and a userspace process doing this (udev) has a chance of being killed by the OOM killer as it will probably require to allocate some memory. Introduce default policy for the newly added memory blocks in /sys/devices/system/memory/auto_online_blocks file with two possible values: "offline" which preserves the current behavior and "online" which causes all newly added memory blocks to go online as soon as they're added. The default is "offline". Vitaly Kuznetsov (2): memory-hotplug: add automatic onlining policy for the newly added memory xen_balloon: support memory auto onlining policy Documentation/memory-hotplug.txt | 19 +++++++++++++++---- drivers/base/memory.c | 40 ++++++++++++++++++++++++++++++++++++---- drivers/xen/Kconfig | 20 +++++++++++++------- drivers/xen/balloon.c | 30 +++++++++++++++++++----------- include/linux/memory.h | 3 ++- include/linux/memory_hotplug.h | 4 +++- mm/memory_hotplug.c | 18 +++++++++++++++--- 7 files changed, 103 insertions(+), 31 deletions(-) -- 2.5.0 -- 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