Re: [RFC-PATCH 1/2] mm: Add __GFP_NO_LOCKS flag

Uladzislau Rezki
2020-08-18T16:01:34Z

Hello, Michal.

You mentioned somewhere in the thread to show figures regarding hitting
a fast path and "fallback one". We follow fallback when a page allocation fails.

Please see below the plot. I hope it is easy to understand:

wget ftp://vps418301.ovh.net/incoming/1000000_kfree_rcu_fast_hit_vs_fallback_hit.png

to summarize. When i tight loop is applied, i.e. flood simulation the fallback hit
is negligible. It is a noise, out of 1 000 000 we have 1% or %2 of fallback hitting.

Thanks!

--
Vlad Rezki