On Tue, Feb 02, 2021 at 09:54:36AM +, Nadav Amit wrote:
> > On Feb 2, 2021, at 1:31 AM, Peter Zijlstra wrote:
> >
> > On Tue, Feb 02, 2021 at 07:20:55AM +, Nadav Amit wrote:
> >> Arm does not define tlb_end_vma, and consequently it flushes the TLB after
> >> each VMA. I suspect it is not
> On Feb 2, 2021, at 1:31 AM, Peter Zijlstra wrote:
>
> On Tue, Feb 02, 2021 at 07:20:55AM +, Nadav Amit wrote:
>> Arm does not define tlb_end_vma, and consequently it flushes the TLB after
>> each VMA. I suspect it is not intentional.
>
> ARM is one of those that look at the VM_EXEC bit to
On Tue, Feb 02, 2021 at 07:20:55AM +, Nadav Amit wrote:
> Arm does not define tlb_end_vma, and consequently it flushes the TLB after
> each VMA. I suspect it is not intentional.
ARM is one of those that look at the VM_EXEC bit to explicitly flush
ITLB IIRC, so it has to.
> On Feb 1, 2021, at 10:41 PM, Nicholas Piggin wrote:
>
> Excerpts from Peter Zijlstra's message of February 1, 2021 10:09 pm:
>> I also don't think AGRESSIVE_FLUSH_BATCHING quite captures what it does.
>> How about:
>>
>> CONFIG_MMU_GATHER_NO_PER_VMA_FLUSH
>
> Yes please, have to have
Excerpts from Peter Zijlstra's message of February 1, 2021 10:09 pm:
> On Sat, Jan 30, 2021 at 04:11:23PM -0800, Nadav Amit wrote:
>
>> diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
>> index 427bfcc6cdec..b97136b7010b 100644
>> --- a/include/asm-generic/tlb.h
>> +++
On Sat, Jan 30, 2021 at 04:11:23PM -0800, Nadav Amit wrote:
> diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
> index 427bfcc6cdec..b97136b7010b 100644
> --- a/include/asm-generic/tlb.h
> +++ b/include/asm-generic/tlb.h
> @@ -334,8 +334,8 @@ static inline void
From: Nadav Amit
Architecture-specific tlb_start_vma() and tlb_end_vma() seem
unnecessary. They are currently used for:
1. Avoid per-VMA TLB flushes. This can be determined by introducing
a new config option.
2. Avoid saving information on the vma that is being flushed. Saving
this
