linux-kernel - Re: [PATCH 03/11] mm/hugetlb: introduce alloc_control structure to simplify migration target allocation APIs

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Message-ID: <CAAmzW4PomH2nL9M1G9A3g0fkMUtsizhZ6w-x4909z=NOx23iWw@mail.gmail.com>
Date:   Thu, 21 May 2020 10:20:41 +0900
From:   Joonsoo Kim <js1304@...il.com>
To:     Roman Gushchin <guro@...com>
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>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Michal Hocko <mhocko@...e.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH 03/11] mm/hugetlb: introduce alloc_control structure to
 simplify migration target allocation APIs

2020년 5월 21일 (목) 오전 9:43, Roman Gushchin <guro@...com>님이 작성:
>
> On Mon, May 18, 2020 at 10:20:49AM +0900, js1304@...il.com wrote:
> > From: Joonsoo Kim <iamjoonsoo.kim@....com>
> >
> > Currently, page allocation functions for migration requires some arguments.
> > More worse, in the following patch, more argument will be needed to unify
> > the similar functions. To simplify them, in this patch, unified data
> > structure that controls allocation behaviour is introduced.
>
> Is it all about huge pages only? If so, maybe adding huge_page suffix/prefix
> to struct alloc_control? E.g. huge_alloc_control or something like this.

No, it will be used for other migration target allocation functions. You can
see it on following patches.

> >
> > For clean-up, function declarations are re-ordered.
> >
> > Note that, gfp_mask handling on alloc_huge_page_(node|nodemask) is
> > slightly changed, from ASSIGN to OR. It's safe since caller of these
> > functions doesn't pass extra gfp_mask except htlb_alloc_mask().
>
> Changes make sense to me, but it feels like this patch is doing several
> thing simultaneously. Do you mind splitting it into few?

I will try to split it on next spin.

Thanks.