linux-kernel - RE: [PATCH v33 1/4] mm: add a function to get free page blocks

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Date:   Sat, 16 Jun 2018 01:19:36 +0000
From:   "Wang, Wei W" <wei.w.wang@...el.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
CC:     "virtio-dev@...ts.oasis-open.org" <virtio-dev@...ts.oasis-open.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        KVM list <kvm@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "liliang.opensource@...il.com" <liliang.opensource@...il.com>,
        "yang.zhang.wz@...il.com" <yang.zhang.wz@...il.com>,
        "quan.xu0@...il.com" <quan.xu0@...il.com>,
        "nilal@...hat.com" <nilal@...hat.com>,
        Rik van Riel <riel@...hat.com>,
        "peterx@...hat.com" <peterx@...hat.com>
Subject: RE: [PATCH v33 1/4] mm: add a function to get free page blocks

On Saturday, June 16, 2018 7:09 AM, Linus Torvalds wrote:
> On Fri, Jun 15, 2018 at 2:08 PM Wei Wang <wei.w.wang@...el.com> wrote:
> >
> > This patch adds a function to get free pages blocks from a free page
> > list. The obtained free page blocks are hints about free pages,
> > because there is no guarantee that they are still on the free page
> > list after the function returns.
> 
> Ack. This is the kind of simple interface where I don't need to worry about
> the MM code calling out to random drivers or subsystems.
> 
> I think that "order" should be checked for validity, but from a MM standpoint
> I think this is fine.
> 

Thanks, will add a validity check for "order".

Best,
Wei