Re: [PATCH v2 0/4] huge vmalloc mappings

David Rientjes
2020-04-14T00:28:03Z

On Mon, 13 Apr 2020, Nicholas Piggin wrote:

> We can get a significant win with larger mappings for some of the big
> global hashes.
>
> Since RFC, relevant architectures have added p?d_leaf accessors so no
> real arch changes required, and I changed it not to allocate huge
> mappings for modules and a bunch of other fixes.
>

Hi Nicholas,

Any performance numbers to share besides the git diff in the last patch in
the series? I'm wondering if anything from mmtests or lkp-tests makes
sense to try?

> Nicholas Piggin (4):
> mm/vmalloc: fix vmalloc_to_page for huge vmap mappings
> mm: Move ioremap page table mapping function to mm/
> mm: HUGE_VMAP arch query functions cleanup
> mm/vmalloc: Hugepage vmalloc mappings
>
> arch/arm64/mm/mmu.c | 8 +-
> arch/powerpc/mm/book3s64/radix_pgtable.c | 6 +-
> arch/x86/mm/ioremap.c | 6 +-
> include/linux/io.h | 3 -
> include/linux/vmalloc.h | 15 +
> lib/ioremap.c | 203 +----------
> mm/vmalloc.c | 413 +++++++++++++++++++----
> 7 files changed, 380 insertions(+), 274 deletions(-)
>
> --
> 2.23.0
>
>
>