Re: [lkp-robot] [mm, vmscan] 5e56dfbd83: fsmark.files_per_sec -11.1% regression

[Michal Hocko]

On Mon 23-01-17 09:26:44, kernel test robot wrote:
> 
> Greeting,
> 
> FYI, we noticed a -11.1% regression of fsmark.files_per_sec due to commit:
> 
> 
> commit: 5e56dfbd837421b7fa3c6c06018c6701e2704917 ("mm, vmscan: consider eligible zones in get_scan_count")
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master

This is more than unexpected. This patch should be basically noop for
anything but CONFIG_HIGHMEM systems. And your config says this is 64b
kernel. Are those results reproducible? And could you try to compare
perf profiles before and after the patch.
-- 
Michal Hocko
SUSE Labs