linux-kernel - Re: [PATCH v2 05/12] mm/hugetlb: unify hugetlb migration callback function

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Date:   Wed, 10 Jun 2020 12:11:35 +0900
From:   Joonsoo Kim <js1304@...il.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>, kernel-team@....com,
        Vlastimil Babka <vbabka@...e.cz>,
        Christoph Hellwig <hch@...radead.org>,
        Roman Gushchin <guro@...com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v2 05/12] mm/hugetlb: unify hugetlb migration callback function

2020년 6월 9일 (화) 오후 10:43, Michal Hocko <mhocko@...nel.org>님이 작성:
>
> On Wed 27-05-20 15:44:56, Joonsoo Kim wrote:
> [...]
> > -/* page migration callback function */
> >  struct page *alloc_huge_page_nodemask(struct hstate *h,
> >                               struct alloc_control *ac)
> >  {
> >       ac->gfp_mask |= htlb_alloc_mask(h);
> > +     if (ac->nid == NUMA_NO_NODE)
> > +             ac->gfp_mask &= ~__GFP_THISNODE;
>
> Is this really needed? alloc_huge_page_node is currently only called
> from numa migration code and the target node should be always defined.

Thanks! When I read the code, I was not sure that the target node is always
defined so I left this code. However, if it's true, this code isn't
needed at all.
I will consider your suggestion in the next version.

Thanks.