Le 21/08/2020 à 06:44, Nicholas Piggin a écrit :
I made this powerpc-only for the time being. It shouldn't be too hard to add support for other archs that define HUGE_VMAP. I have booted x86 with it enabled, just may not have audited everything.
I like this series, but if I understand correctly it enables huge vmalloc mappings only for hugepages sizes matching a page directory levels, ie on a PPC32 it would work only for 4M hugepages.
On the 8xx, we only have 8M and 512k hugepages. Any change that it can support these as well one day ?
Christophe
Hi Andrew, would you care to put this in your tree? Thanks, Nick Since v4: - Fixed an off-by-page-order bug in v4 - Several minor cleanups. - Added page order to /proc/vmallocinfo - Added hugepage to alloc_large_system_hage output. - Made an architecture config option, powerpc only for now. Since v3: - Fixed an off-by-one bug in a loop - Fix !CONFIG_HAVE_ARCH_HUGE_VMAP build fail - Hopefully this time fix the arm64 vmap stack bug, thanks Jonathan Cameron for debugging the cause of this (hopefully). Since v2: - Rebased on vmalloc cleanups, split series into simpler pieces. - Fixed several compile errors and warnings - Keep the page array and accounting in small page units because struct vm_struct is an interface (this should fix x86 vmap stack debug assert). [Thanks Zefan] Nicholas Piggin (8): mm/vmalloc: fix vmalloc_to_page for huge vmap mappings mm: apply_to_pte_range warn and fail if a large pte is encountered mm/vmalloc: rename vmap_*_range vmap_pages_*_range lib/ioremap: rename ioremap_*_range to vmap_*_range mm: HUGE_VMAP arch support cleanup mm: Move vmap_range from lib/ioremap.c to mm/vmalloc.c mm/vmalloc: add vmap_range_noflush variant mm/vmalloc: Hugepage vmalloc mappings .../admin-guide/kernel-parameters.txt | 2 + arch/Kconfig | 4 + arch/arm64/mm/mmu.c | 12 +- arch/powerpc/Kconfig | 1 + arch/powerpc/mm/book3s64/radix_pgtable.c | 10 +- arch/x86/mm/ioremap.c | 12 +- include/linux/io.h | 9 - include/linux/vmalloc.h | 13 + init/main.c | 1 - mm/ioremap.c | 231 +-------- mm/memory.c | 60 ++- mm/page_alloc.c | 4 +- mm/vmalloc.c | 456 +++++++++++++++--- 13 files changed, 476 insertions(+), 339 deletions(-)
