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

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Message-ID: <alpine.DEB.2.21.2004131727150.260270@chino.kir.corp.google.com>
Date:   Mon, 13 Apr 2020 17:27:58 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Nicholas Piggin <npiggin@...il.com>
cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v2 0/4] huge vmalloc mappings

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
> 
> 
>