2018-03-20 21:53 GMT-07:00 Aaron Lu <aaron.lu@intel.com>:

> On Tue, Mar 20, 2018 at 09:21:33PM -0700, Figo.zhang wrote:
> > suppose that in free_one_page() will try to merge to high order anytime ,
> > but now in your patch,
> > those merge has postponed when system in low memory status, it is very
> easy
> > let system trigger
> > low memory state and get poor performance.
>
> Merge or not merge, the size of free memory is not affected.
>

yes, the total free memory is not impact, but will influence the higher
order allocation.