From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk0-f199.google.com (mail-qk0-f199.google.com [209.85.220.199]) by kanga.kvack.org (Postfix) with ESMTP id 667496B0310 for ; Mon, 9 Jul 2018 13:53:30 -0400 (EDT) Received: by mail-qk0-f199.google.com with SMTP id 17-v6so1142661qkz.15 for ; Mon, 09 Jul 2018 10:53:30 -0700 (PDT) Received: from userp2130.oracle.com (userp2130.oracle.com. [156.151.31.86]) by mx.google.com with ESMTPS id m188-v6si389760qkd.89.2018.07.09.10.53.29 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 09 Jul 2018 10:53:29 -0700 (PDT) From: Pavel Tatashin Subject: [PATCH v4 0/3] sparse_init rewrite Date: Mon, 9 Jul 2018 13:53:09 -0400 Message-Id: <20180709175312.11155-1-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: v4 - v3 - Addressed comments from Dave Hansen 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 (3): mm/sparse: add sparse_init_nid() mm/sparse: start using sparse_init_nid(), and remove old code mm/sparse: refactor sparse vmemmap buffer allocations include/linux/mm.h | 13 +- mm/sparse-vmemmap.c | 111 ++++++++++------- mm/sparse.c | 281 +++++++++++++++----------------------------- 3 files changed, 170 insertions(+), 235 deletions(-) -- 2.18.0