linux-kernel - Re: [PATCH 3/6] mm: hugetlb_vmemmap: introduce the name HVO

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Date:   Tue, 14 Jun 2022 11:17:51 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     david@...hat.com, akpm@...ux-foundation.org, corbet@....net,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH 3/6] mm: hugetlb_vmemmap: introduce the name HVO

On Mon, Jun 13, 2022 at 02:19:45PM -0700, Mike Kravetz wrote:
> On Mon, Jun 13, 2022 at 02:35:09PM +0800”, Muchun Song wrote:
> > It it inconvenient to mention the feature of optimizing vmemmap pages associated
> > with HugeTLB pages when communicating with others since there is no specific or
> > abbreviated name for it when it is first introduced.  Let us give it a name HVO
> > (HugeTLB Vmemmap Optimization) from now.
> > 
> > This commit also updates the document about "hugetlb_free_vmemmap" by the way
> > discussed in thread [1].
> > 
> > Link: https://lore.kernel.org/all/21aae898-d54d-cc4b-a11f-1bb7fddcfffa@redhat.com/ [1]
> > Signed-off-by: Muchun Song <songmuchun@...edance.com>
> > ---
> 
> > diff --git a/Documentation/admin-guide/mm/hugetlbpage.rst b/Documentation/admin-guide/mm/hugetlbpage.rst
> > index a90330d0a837..64e0d5c512e7 100644
> > --- a/Documentation/admin-guide/mm/hugetlbpage.rst
> > +++ b/Documentation/admin-guide/mm/hugetlbpage.rst
> > @@ -164,8 +164,7 @@ default_hugepagesz
> >  	will all result in 256 2M huge pages being allocated.  Valid default
> >  	huge page size is architecture dependent.
> >  hugetlb_free_vmemmap
> > -	When CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP is set, this enables optimizing
> > -	unused vmemmap pages associated with each HugeTLB page.
> > +	When CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP is set, this enables HVO.
> 
> I think we need to define HVO before using it here.  Readers may be able
> to determine the meaning, but to be sure I would suggest:
>

Agree.
 
> When CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP is set this enables
> HugeTLB Vmemmap Optimization (HVO).
> 

I would use this. Thanks.

> Everything else looks good to me.
> Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>

Thanks for your review.