linux-kernel - Re: [External] Re: [PATCH v2 00/19] Free some vmemmap pages of hugetlb page

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Message-ID: <CAMZfGtU4VQ08dnxNBsFfxVEnuOZauOhGSLQpi++3fngc_qNqXQ@mail.gmail.com>
Date:   Tue, 27 Oct 2020 10:54:18 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Matthew Wilcox <willy@...radead.org>
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>,
        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 v2 00/19] Free some vmemmap pages of
 hugetlb page

On Mon, Oct 26, 2020 at 11:53 PM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Mon, Oct 26, 2020 at 10:50:55PM +0800, Muchun Song wrote:
> > For tail pages, the value of compound_dtor is the same. So we can reuse
>
> compound_dtor is only set on the first tail page.  compound_head is
> what you mean here, I think.
>

Yes, that's right.  Sorry for the confusion. Thanks.

-- 
Yours,
Muchun