linux-kernel - Re: [External] Re: [PATCH v10 09/11] mm/hugetlb: Introduce nr_free_vmemmap

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Message-ID: <CAMZfGtUr5NhScQDVF+DzsUHxYVD6vEs+2wEz6SOi-Y84+PXK2A@mail.gmail.com>
Date:   Mon, 21 Dec 2020 17:33:47 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Oscar Salvador <osalvador@...e.de>
Cc:     Jonathan Corbet <corbet@....net>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org,
        Peter Zijlstra <peterz@...radead.org>, viro@...iv.linux.org.uk,
        Andrew Morton <akpm@...ux-foundation.org>, paulmck@...nel.org,
        mchehab+huawei@...nel.org, pawan.kumar.gupta@...ux.intel.com,
        Randy Dunlap <rdunlap@...radead.org>, oneukum@...e.com,
        anshuman.khandual@....com, jroedel@...e.de,
        Mina Almasry <almasrymina@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...e.com>,
        "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>,
        David Hildenbrand <david@...hat.com>, naoya.horiguchi@....com,
        Xiongchun duan <duanxiongchun@...edance.com>,
        linux-doc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [External] Re: [PATCH v10 09/11] mm/hugetlb: Introduce
 nr_free_vmemmap_pages in the struct hstate

On Mon, Dec 21, 2020 at 4:17 PM Oscar Salvador <osalvador@...e.de> wrote:
>
> On Thu, Dec 17, 2020 at 08:13:01PM +0800, Muchun Song wrote:
> > @@ -182,6 +184,12 @@ bool hugetlb_free_vmemmap_enabled;
> >
> >  static int __init early_hugetlb_free_vmemmap_param(char *buf)
> >  {
> > +     /* We cannot optimize if a "struct page" crosses page boundaries. */
> > +     if ((!is_power_of_2(sizeof(struct page)))) {
> > +             pr_warn("cannot free vmemmap pages because \"struct page\" crosses page boundaries\n");
> > +             return 0;
> > +     }
>
> Unless there is a strong reason behind, I would move this to the previous patch,
> where early_hugetlb_free_vmemmap_param is introduced.

OK. Will do. Thanks.

>
> --
> Oscar Salvador
> SUSE L3



-- 
Yours,
Muchun