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


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