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SubjectRe: [PATCH v5 0/8] huge vmalloc mappings
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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(-)
>

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