Re: [PATCH] mm: reduce tlb flush range when changing vma protection

[maobibo]

yeap, your patch is general and better than mine, it can solve the issue.
please drop my patch.

regards
bibo, mao

On 03/09/2022 12:14 PM, Nadav Amit wrote:
> 
> 
>> On Mar 8, 2022, at 6:57 PM, Bibo Mao <maobibo@xxxxxxxxxxx> wrote:
>>
>> numa worker will periodically change vma prot with PROT_NONE, by
>> default it will scan 256M vma memory size with pmd stepping size.
>> If there are fewer pages changed with PROT_NONE, tlb flush is called
>> with pmd size. This patch will calculate flush range for those
>> pages with pte prot changed, it will reduce size for tlb flush.
>>
>> Signed-off-by: Bibo Mao <maobibo@xxxxxxxxxxx>
> 
> Hi Bibo,
> 
> I finally managed to make v3 of a patchiest, which I think does
> something similar to what you are looking for (without introducing
> yet another TLB batching mechanism).
> 
> Have a look at [1] and let me know if that would satisfy you.
> 
> 
> [1] https://lore.kernel.org/linux-mm/20220309041043.302261-4-namit@xxxxxxxxxx/T/#u
>