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Date: Tue, 17 Nov 2020 06:24:51 +0100 From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de> To: Mike Rapoport <rppt@...nel.org>, Andrew Morton <akpm@...ux-foundation.org> Cc: Alexey Dobriyan <adobriyan@...il.com>, Catalin Marinas <catalin.marinas@....com>, Geert Uytterhoeven <geert@...ux-m68k.org>, Greg Ungerer <gerg@...ux-m68k.org>, Jonathan Corbet <corbet@....net>, Matt Turner <mattst88@...il.com>, Meelis Roos <mroos@...ux.ee>, Michael Schmitz <schmitzmic@...il.com>, Mike Rapoport <rppt@...ux.ibm.com>, Russell King <linux@...linux.org.uk>, Tony Luck <tony.luck@...el.com>, Vineet Gupta <vgupta@...opsys.com>, Will Deacon <will@...nel.org>, linux-alpha@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org, linux-mm@...ck.org, linux-snps-arc@...ts.infradead.org Subject: Re: [PATCH v2 00/13] arch, mm: deprecate DISCONTIGMEM 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@...ian.org `. `' Freie Universitaet Berlin - glaubitz@...sik.fu-berlin.de `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
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