On 1/21/21 1:26 PM, Will Deacon wrote: > On Wed, 20 Jan 2021 21:29:12 -0800, Sudarshan Rajagopalan wrote: >> This patch is the follow-up from the discussions in the thread [1]. >> Reducing the section size has the merit of reducing wastage of reserved memory >> for vmmemmap mappings for sections with large memory holes. Also with smaller >> section size gives more grunularity and agility for memory hot(un)plugging. >> >> But there are also constraints in reducing SECTION_SIZE_BIT: >> >> [...] > > Applied to arm64 (for-next/misc), thanks! We have been using 128M for 4K pages for a while, using patch [1] without issues. One thing that needs to be also modified is makedumpfile [2]- line 76, must update it SECTIONS_SIZE_BITS based on the PAGESIZE. [1] https://lore.kernel.org/lkml/20190423203843.2898-1-pasha.tatashin@xxxxxxxxxx/ [2] https://sourceforge.net/p/makedumpfile/code/ci/master/tree/arch/arm64.c > > [1/1] arm64/sparsemem: reduce SECTION_SIZE_BITS > https://git.kernel.org/arm64/c/f0b13ee23241 > > Cheers, >
