From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-f200.google.com (mail-qt0-f200.google.com [209.85.216.200]) by kanga.kvack.org (Postfix) with ESMTP id 35A686B0006 for ; Sun, 1 Jul 2018 22:04:32 -0400 (EDT) Received: by mail-qt0-f200.google.com with SMTP id n23-v6so3940995qtl.4 for ; Sun, 01 Jul 2018 19:04:32 -0700 (PDT) Received: from userp2120.oracle.com (userp2120.oracle.com. [156.151.31.85]) by mx.google.com with ESMTPS id p15-v6si9011392qve.62.2018.07.01.19.04.31 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 01 Jul 2018 19:04:31 -0700 (PDT) From: Pavel Tatashin Subject: [PATCH v3 0/2] sparse_init rewrite Date: Sun, 1 Jul 2018 22:04:15 -0400 Message-Id: <20180702020417.21281-1-pasha.tatashin@oracle.com> Sender: owner-linux-mm@kvack.org List-ID: To: steven.sistare@oracle.com, daniel.m.jordan@oracle.com, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, mhocko@suse.com, linux-mm@kvack.org, dan.j.williams@intel.com, jack@suse.cz, jglisse@redhat.com, jrdr.linux@gmail.com, bhe@redhat.com, gregkh@linuxfoundation.org, vbabka@suse.cz, richard.weiyang@gmail.com, dave.hansen@intel.com, rientjes@google.com, mingo@kernel.org, osalvador@techadventures.net, pasha.tatashin@oracle.com Changelog: v3 - v1 - Fixed two issues found by Baoquan He v1 - v2 - Addressed comments from Oscar Salvador In sparse_init() we allocate two large buffers to temporary hold usemap and memmap for the whole machine. However, we can avoid doing that if we changed sparse_init() to operated on per-node bases instead of doing it on the whole machine beforehand. As shown by Baoquan http://lkml.kernel.org/r/20180628062857.29658-1-bhe@redhat.com The buffers are large enough to cause machine stop to boot on small memory systems. These patches should be applied on top of Baoquan's work, as CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER is removed in that work. For the ease of review, I split this work so the first patch only adds new interfaces, the second patch enables them, and removes the old ones. Pavel Tatashin (2): mm/sparse: add sparse_init_nid() mm/sparse: start using sparse_init_nid(), and remove old code include/linux/mm.h | 9 +- mm/sparse-vmemmap.c | 44 ++++--- mm/sparse.c | 279 +++++++++++++++----------------------------- 3 files changed, 125 insertions(+), 207 deletions(-) -- 2.18.0