Re: [PATCH v2] mm: add access/dirty bit on numa page fault

[maobibo]

On 03/18/2022 09:46 AM, Matthew Wilcox wrote:
> On Fri, Mar 18, 2022 at 09:01:32AM +0800, maobibo wrote:
>>> Is this a correctness problem, in which case this will need to be
>>> backported, or is this a performance problem, in which case can you
>>> share some numbers?
>> It is only performance issue, and there is no obvious performance
>> improvement for general workloads on my hand, but I do not test
>> it on microbenchmark.
> 
> ... if there's no performance improvement, why should we apply this
> patch?  Confused.
> 
It is not obvious from workload view, it actually reduces one tlb miss
on platforms without hw page walk.