From: Mike Rapoport <rppt@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Greg Ungerer <gerg@linux-m68k.org>,
John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
Jonathan Corbet <corbet@lwn.net>,
Matt Turner <mattst88@gmail.com>, Meelis Roos <mroos@linux.ee>,
Michael Schmitz <schmitzmic@gmail.com>,
Mike Rapoport <rppt@kernel.org>,
Mike Rapoport <rppt@linux.ibm.com>,
Russell King <linux@armlinux.org.uk>,
Tony Luck <tony.luck@intel.com>,
Vineet Gupta <vgupta@synopsys.com>, Will Deacon <will@kernel.org>,
linux-alpha@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-ia64@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org,
linux-mm@kvack.org, linux-snps-arc@lists.infradead.org
Subject: [PATCH v2 00/13] arch, mm: deprecate DISCONTIGMEM
Date: Sun, 1 Nov 2020 19:04:41 +0200 [thread overview]
Message-ID: <20201101170454.9567-1-rppt@kernel.org> (raw)
From: Mike Rapoport <rppt@linux.ibm.com>
Hi,
It's been a while since DISCONTIGMEM is generally considered deprecated,
but it is still used by four architectures. This set replaces DISCONTIGMEM
with a different way to handle holes in the memory map and marks
DISCONTIGMEM configuration as BROKEN in Kconfigs of these architectures with
the intention to completely remove it in several releases.
While for 64-bit alpha and ia64 the switch to SPARSEMEM is quite obvious
and was a matter of moving some bits around, for smaller 32-bit arc and
m68k SPARSEMEM is not necessarily the best thing to do.
On 32-bit machines SPARSEMEM would require large sections to make section
index fit in the page flags, but larger sections mean that more memory is
wasted for unused memory map.
Besides, pfn_to_page() and page_to_pfn() become less efficient, at least on
arc.
So I've decided to generalize arm's approach for freeing of unused parts of
the memory map with FLATMEM and enable it for both arc and m68k. The
details are in the description of patches 10 (arc) and 13 (m68k).
v2 changes:
- remove additional stale '#ifdef CONFIG_SINGLE_MEMORY_CHUNK' on m68k
- fix bisectability on m68k
v1:
https://lore.kernel.org/lkml/20201027112955.14157-1-rppt@kernel.org
Mike Rapoport (13):
alpha: switch from DISCONTIGMEM to SPARSEMEM
ia64: remove custom __early_pfn_to_nid()
ia64: remove 'ifdef CONFIG_ZONE_DMA32' statements
ia64: discontig: paging_init(): remove local max_pfn calculation
ia64: split virtual map initialization out of paging_init()
ia64: forbid using VIRTUAL_MEM_MAP with FLATMEM
ia64: make SPARSEMEM default and disable DISCONTIGMEM
arm: remove CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
arm, arm64: move free_unused_memmap() to generic mm
arc: use FLATMEM with freeing of unused memory map instead of
DISCONTIGMEM
m68k/mm: make node data and node setup depend on CONFIG_DISCONTIGMEM
m68k/mm: enable use of generic memory_model.h for !DISCONTIGMEM
m68k: deprecate DISCONTIGMEM
Documentation/vm/memory-model.rst | 3 +-
arch/Kconfig | 3 ++
arch/alpha/Kconfig | 8 +++
arch/alpha/include/asm/mmzone.h | 14 +----
arch/alpha/include/asm/page.h | 7 +--
arch/alpha/include/asm/pgtable.h | 12 ++---
arch/alpha/include/asm/sparsemem.h | 18 +++++++
arch/alpha/kernel/setup.c | 1 +
arch/arc/Kconfig | 3 +-
arch/arc/include/asm/page.h | 20 ++++++--
arch/arc/mm/init.c | 29 ++++++++---
arch/arm/Kconfig | 10 +---
arch/arm/mach-bcm/Kconfig | 1 -
arch/arm/mach-davinci/Kconfig | 1 -
arch/arm/mach-exynos/Kconfig | 1 -
arch/arm/mach-highbank/Kconfig | 1 -
arch/arm/mach-omap2/Kconfig | 1 -
arch/arm/mach-s5pv210/Kconfig | 1 -
arch/arm/mach-tango/Kconfig | 1 -
arch/arm/mm/init.c | 78 ----------------------------
arch/arm64/Kconfig | 4 +-
arch/arm64/mm/init.c | 68 ------------------------
arch/ia64/Kconfig | 11 ++--
arch/ia64/include/asm/meminit.h | 2 -
arch/ia64/mm/contig.c | 58 ++++++++++-----------
arch/ia64/mm/discontig.c | 44 ++++++++--------
arch/ia64/mm/init.c | 14 -----
arch/ia64/mm/numa.c | 30 -----------
arch/m68k/Kconfig.cpu | 31 +++++++++--
arch/m68k/include/asm/page.h | 2 +
arch/m68k/include/asm/page_mm.h | 7 ++-
arch/m68k/include/asm/virtconvert.h | 5 --
arch/m68k/mm/init.c | 8 +--
fs/proc/kcore.c | 2 -
include/linux/mm.h | 3 --
include/linux/mmzone.h | 42 ---------------
mm/memblock.c | 80 +++++++++++++++++++++++++++++
mm/mmzone.c | 14 -----
mm/page_alloc.c | 16 ++++--
mm/vmstat.c | 4 --
40 files changed, 270 insertions(+), 388 deletions(-)
create mode 100644 arch/alpha/include/asm/sparsemem.h
base-commit: 3650b228f83adda7e5ee532e2b90429c03f7b9ec
--
2.28.0
next reply other threads:[~2020-11-01 17:05 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-01 17:04 Mike Rapoport [this message]
2020-11-01 17:04 ` [PATCH v2 01/13] alpha: switch from DISCONTIGMEM to SPARSEMEM Mike Rapoport
2020-11-01 17:04 ` [PATCH v2 02/13] ia64: remove custom __early_pfn_to_nid() Mike Rapoport
2020-11-01 17:04 ` [PATCH v2 03/13] ia64: remove 'ifdef CONFIG_ZONE_DMA32' statements Mike Rapoport
2020-11-01 17:04 ` [PATCH v2 04/13] ia64: discontig: paging_init(): remove local max_pfn calculation Mike Rapoport
2020-11-01 17:04 ` [PATCH v2 05/13] ia64: split virtual map initialization out of paging_init() Mike Rapoport
2020-11-01 17:04 ` [PATCH v2 06/13] ia64: forbid using VIRTUAL_MEM_MAP with FLATMEM Mike Rapoport
2020-11-01 17:04 ` [PATCH v2 07/13] ia64: make SPARSEMEM default and disable DISCONTIGMEM Mike Rapoport
2020-11-01 17:04 ` [PATCH v2 08/13] arm: remove CONFIG_ARCH_HAS_HOLES_MEMORYMODEL Mike Rapoport
2020-11-02 9:43 ` David Hildenbrand
2020-11-01 17:04 ` [PATCH v2 09/13] arm, arm64: move free_unused_memmap() to generic mm Mike Rapoport
2020-11-14 12:15 ` Catalin Marinas
2020-11-01 17:04 ` [PATCH v2 10/13] arc: use FLATMEM with freeing of unused memory map instead of DISCONTIGMEM Mike Rapoport
2020-11-17 6:40 ` Vineet Gupta
2020-11-17 6:57 ` Mike Rapoport
2020-11-24 0:26 ` Vineet Gupta
2020-11-01 17:04 ` [PATCH v2 11/13] m68k/mm: make node data and node setup depend on CONFIG_DISCONTIGMEM Mike Rapoport
2020-11-01 17:04 ` [PATCH v2 12/13] m68k/mm: enable use of generic memory_model.h for !DISCONTIGMEM Mike Rapoport
2020-11-01 17:04 ` [PATCH v2 13/13] m68k: deprecate DISCONTIGMEM Mike Rapoport
2020-11-17 5:24 ` [PATCH v2 00/13] arch, mm: " John Paul Adrian Glaubitz
2020-11-17 6:23 ` Mike Rapoport
2020-11-17 8:07 ` John Paul Adrian Glaubitz
2020-11-17 8:14 ` Mike Rapoport
2020-12-01 9:10 ` John Paul Adrian Glaubitz
2020-12-01 10:29 ` Mike Rapoport
2020-12-01 11:35 ` John Paul Adrian Glaubitz
2020-12-01 12:10 ` Mike Rapoport
2020-12-01 12:16 ` John Paul Adrian Glaubitz
2020-12-01 13:56 ` Mike Rapoport
2020-12-01 15:03 ` Jens Axboe
2020-12-01 15:33 ` Geert Uytterhoeven
2020-12-02 8:43 ` Christoph Hellwig
2020-12-02 8:45 ` John Paul Adrian Glaubitz
2020-12-02 8:46 ` Christoph Hellwig
2020-12-02 8:46 ` Mike Rapoport
2020-12-02 8:47 ` Christoph Hellwig
2020-12-01 15:07 ` John Paul Adrian Glaubitz
2020-12-01 19:55 ` John Paul Adrian Glaubitz
2020-12-02 7:14 ` Mike Rapoport
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