Re: [PATCH v3 0/5] mm/memcg: Reduce kmemcache memory accounting overhead

Matthew Wilcox
2021-04-15T17:11:38Z

On Tue, Apr 13, 2021 at 09:20:22PM -0400, Waiman Long wrote:
> With memory accounting disable, the run time was 2.848s. With memory
> accounting enabled, the run times with the application of various
> patches in the patchset were:
>
> Applied patches Run time Accounting overhead Overhead %age
> --------------- -------- ------------------- -------------
> None 10.800s 7.952s 100.0%
> 1-2 9.140s 6.292s 79.1%
> 1-3 7.641s 4.793s 60.3%
> 1-5 6.801s 3.953s 49.7%

I think this is a misleading way to report the overhead. I would have said:

10.800s 7.952s 279.2%
9.140s 6.292s 220.9%
7.641s 4.793s 168.3%
6.801s 3.953s 138.8%