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

[Wei Wang]

On 07/12/2018 12:23 AM, Linus Torvalds wrote:
> On Wed, Jul 11, 2018 at 2:21 AM Michal Hocko <mhocko@xxxxxxxxxx> wrote:
> > We already have an interface for that. alloc_pages(GFP_NOWAIT, MAX_ORDER -1).
> > So why do we need any array based interface?
> That was actually my original argument in the original thread - that
> the only new interface people might want is one that just tells how
> many of those MAX_ORDER-1 pages there are.
>
> See the thread in v33 with the subject
>
>    "[PATCH v33 1/4] mm: add a function to get free page blocks"
>
> and look for me suggesting just using
>
>      #define GFP_MINFLAGS (__GFP_NORETRY | __GFP_NOWARN |
> __GFP_THISNODE | __GFP_NOMEMALLOC)

Would it be better to remove __GFP_THISNODE? We actually want to get all 
the guest free pages (from all the nodes).

Best,
Wei