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

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Message-ID: <20201026155351.GS20115@casper.infradead.org>
Date:   Mon, 26 Oct 2020 15:53:51 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     corbet@....net, mike.kravetz@...cle.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        viro@...iv.linux.org.uk, akpm@...ux-foundation.org,
        paulmck@...nel.org, mchehab+huawei@...nel.org,
        pawan.kumar.gupta@...ux.intel.com, rdunlap@...radead.org,
        oneukum@...e.com, anshuman.khandual@....com, jroedel@...e.de,
        almasrymina@...gle.com, rientjes@...gle.com,
        duanxiongchun@...edance.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2 00/19] Free some vmemmap pages of hugetlb page

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.