From: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
To: Mike Rapoport <rppt@kernel.org>,
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>,
Jonathan Corbet <corbet@lwn.net>,
Matt Turner <mattst88@gmail.com>, Meelis Roos <mroos@linux.ee>,
Michael Schmitz <schmitzmic@gmail.com>,
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: Re: [PATCH v2 00/13] arch, mm: deprecate DISCONTIGMEM
Date: Tue, 17 Nov 2020 06:24:51 +0100 [thread overview]
Message-ID: <43c53597-6267-bdc2-a975-0aab5daa0d37@physik.fu-berlin.de> (raw)
In-Reply-To: <20201101170454.9567-1-rppt@kernel.org>
Hi!
On 11/1/20 6:04 PM, Mike Rapoport wrote:
> 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).
Apologies for the late reply. Is this still relevant for testing?
I have already successfully tested v1 of the patch set, shall I test v2?
Adrian
--
.''`. John Paul Adrian Glaubitz
: :' : Debian Developer - glaubitz@debian.org
`. `' Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
`- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
next prev parent reply other threads:[~2020-11-17 5:32 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-01 17:04 [PATCH v2 00/13] arch, mm: deprecate DISCONTIGMEM Mike Rapoport
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 ` John Paul Adrian Glaubitz [this message]
2020-11-17 6:23 ` [PATCH v2 00/13] arch, mm: " 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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