Hi Adrian, On Tue, Nov 17, 2020 at 06:24:51AM +0100, John Paul Adrian Glaubitz wrote: > 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? There were minor differences only for m68k between the versions. I've verified them on ARAnyM but if you have a real machine a run there would be nice. > Adrian > > -- > .''`. John Paul Adrian Glaubitz > : :' : Debian Developer - glaubitz@xxxxxxxxxx > `. `' Freie Universitaet Berlin - glaubitz@xxxxxxxxxxxxxxxxxxx > `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913 > > -- Sincerely yours, Mike.
