Re: [PATCH v2 0/5] Fix lazy mmu mode

[Jürgen Groß <jgross@xxxxxxxx>]

On 03.03.25 15:15, Ryan Roberts wrote:
> Hi All,
>
> I'm planning to implement lazy mmu mode for arm64 to optimize vmalloc. As part
> of that, I will extend lazy mmu mode to cover kernel mappings in vmalloc table
> walkers. While lazy mmu mode is already used for kernel mappings in a few
> places, this will extend it's use significantly.
>
> Having reviewed the existing lazy mmu implementations in powerpc, sparc and x86,
> it looks like there are a bunch of bugs, some of which may be more likely to
> trigger once I extend the use of lazy mmu. So this series attempts to clarify
> the requirements and fix all the bugs in advance of that series. See patch #1
> commit log for all the details.
>
> Note that I have only been able to compile test these changes but I think they
> are in good enough shape for some linux-next testing.
>
> Applies on Friday's mm-unstable (5f089a9aa987), as I assume this would be
> preferred via that tree.
>
> Changes since v1
> ================
>    - split v1 patch #1 into v2 patch #1 and #2; per David
>    - Added Acked-by tags from David and Andreas; Thanks!
>    - Refined the patches which are truely fixes and added to stable to cc
>
> Thanks,
> Ryan
>
> Ryan Roberts (5):
>    mm: Fix lazy mmu docs and usage
>    fs/proc/task_mmu: Reduce scope of lazy mmu region
>    sparc/mm: Disable preemption in lazy mmu mode
>    sparc/mm: Avoid calling arch_enter/leave_lazy_mmu() in set_ptes
>    Revert "x86/xen: allow nesting of same lazy mode"
>
>   arch/sparc/include/asm/pgtable_64.h   |  2 --
>   arch/sparc/mm/tlb.c                   |  5 ++++-
>   arch/x86/include/asm/xen/hypervisor.h | 15 ++-------------
>   arch/x86/xen/enlighten_pv.c           |  1 -
>   fs/proc/task_mmu.c                    | 11 ++++-------
>   include/linux/pgtable.h               | 14 ++++++++------
>   6 files changed, 18 insertions(+), 30 deletions(-)
For the series:

Acked-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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