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

[Matthew Wilcox]

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%