linux-kernel - Re: [v3 1/4] mm: hugetlb_vmemmap: Use nid of the head page to reallocate it

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Date:   Mon, 28 Aug 2023 11:25:35 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Muchun Song <muchun.song@...ux.dev>
Cc:     Usama Arif <usama.arif@...edance.com>,
        Linux-MM <linux-mm@...ck.org>, Mike Rapoport <rppt@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Muchun Song <songmuchun@...edance.com>,
        fam.zheng@...edance.com, liangma@...ngbit.com,
        punit.agrawal@...edance.com
Subject: Re: [v3 1/4] mm: hugetlb_vmemmap: Use nid of the head page to
 reallocate it

On 08/28/23 15:15, Muchun Song wrote:
> 
> 
> > On Aug 25, 2023, at 19:18, Usama Arif <usama.arif@...edance.com> wrote:
> > 
> > If tail page prep and initialization is skipped, then the "start"
> > page will not contain the correct nid. Use the nid from first
> > vmemap page.
> > 
> > Signed-off-by: Usama Arif <usama.arif@...edance.com>
> 
> Make sense even if without your optimization. Because the nid is
> used for allocation for "reuse" page, it really should be extracted
> from "reuse" page instead of "start" page.
> 
> Reviewed-by: Muchun Song <songmuchun@...edance.com>

Agree that using reuse is better than start here.  However, IIUC there is no
way start and reuse could be on different nodes today.

Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>
-- 
Mike Kravetz