Re: [PATCH] mm: thp: remove use_zero_page sysfs knob

[Matthew Wilcox]

On Fri, Jul 20, 2018 at 02:05:52PM -0700, David Rientjes wrote:
> The huge zero page can be reclaimed under memory pressure and, if it is, 
> it is attempted to be allocted again with gfp flags that attempt memory 
> compaction that can become expensive.  If we are constantly under memory 
> pressure, it gets freed and reallocated millions of times always trying to 
> compact memory both directly and by kicking kcompactd in the background.
> 
> It likely should also be per node.

Have you benchmarked making the non-huge zero page per-node?