Re: [memcg] 0f12156dff: will-it-scale.per_process_ops -33.6% regression

[Jens Axboe]

On 9/7/21 9:07 AM, kernel test robot wrote:
> 
> 
> Greeting,
> 
> FYI, we noticed a -33.6% regression of will-it-scale.per_process_ops due to commit:
> 
> 
> commit: 0f12156dff2862ac54235fc72703f18770769042 ("memcg: enable accounting for file lock caches")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

Are we at all worried about these? There's been a number of them
reported, basically for all the accounting enablements that have been
done in this merge window.

When io_uring was switched to use accounted memory, we did a bunch of
work to ameliorate the inevitable slowdowns that happen if you do
repeated allocs and/or frees and have memcg accounting enabled.

-- 
Jens Axboe