linux-kernel - [PATCH v3 0/2] sparse

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Date:   Sun,  1 Jul 2018 22:04:15 -0400
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     steven.sistare@...cle.com, daniel.m.jordan@...cle.com,
        linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        kirill.shutemov@...ux.intel.com, mhocko@...e.com,
        linux-mm@...ck.org, dan.j.williams@...el.com, jack@...e.cz,
        jglisse@...hat.com, jrdr.linux@...il.com, bhe@...hat.com,
        gregkh@...uxfoundation.org, vbabka@...e.cz,
        richard.weiyang@...il.com, dave.hansen@...el.com,
        rientjes@...gle.com, mingo@...nel.org,
        osalvador@...hadventures.net, pasha.tatashin@...cle.com
Subject: [PATCH v3 0/2] sparse_init rewrite

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