Re: [PATCH v35 1/5] mm: support to get hints of free page blocks

[Wei Wang <wei.w.wang@intel.com>]

On 07/11/2018 05:21 PM, Michal Hocko wrote:
> On Tue 10-07-18 18:44:34, Linus Torvalds wrote:
> [...]
> > That was what I tried to encourage with actually removing the pages
> > form the page list. That would be an _incremental_ interface. You can
> > remove MAX_ORDER-1 pages one by one (or a hundred at a time), and mark
> > them free for ballooning that way. And if you still feel you have tons
> > of free memory, just continue removing more pages from the free list.
> We already have an interface for that. alloc_pages(GFP_NOWAIT, MAX_ORDER -1).
> So why do we need any array based interface?

Yes, I'm trying to get free pages directly via alloc_pages, so there 
will be no new mm APIs.
I plan to let free page allocation stop when the remaining system free 
memory becomes close to min_free_kbytes (prevent swapping).


Best,
Wei