Re: [PATCH v9 07/20] mm/lru: introduce TestClearPageLRU

[Alex Shi]

å 2020/3/4 äå8:46, Andrew Morton åé:
> 
> Well, any difference would be small and the numbers did get a bit
> lower, albeit probably within the margin of error.
> 
> But you know, if someone were to send a patch which micro-optimized
> some code by replacing 'TestClearXXX()' with `if PageXXX()
> ClearPageXXX()', I would happily merge it!
> 
> Is this change essential to the overall patchset?  If not, I'd be
> inclined to skip it?
> 

Hi Andrew,

Thanks a lot for comments!
Yes, this patch is essential for all next.

Consider the normal memory testing would focus on user page, that probabably with PageLRU. 

Fengguang's vm-scalibicase-small-allocs which used a lots vm_area_struct slab, which may
got some impact. 0day/Cheng Rong is working on the test. In my roughly testing, it may drop 5% on my
96threads/394GB machine.

Thanks
Alex