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Date:   Thu, 12 Jul 2018 10:21:58 +0800
From:   Wei Wang <>
To:     Linus Torvalds <>,
        Michal Hocko <>
        Linux Kernel Mailing List <>,
        virtualization <>,
        KVM list <>, linux-mm <>,
        "Michael S. Tsirkin" <>,
        Andrew Morton <>,
        Paolo Bonzini <>,,,,,
        Rik van Riel <>,
Subject: Re: [PATCH v35 1/5] mm: support to get hints of free page blocks

On 07/12/2018 12:23 AM, Linus Torvalds wrote:
> On Wed, Jul 11, 2018 at 2:21 AM Michal Hocko <> 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

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


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