linux-kernel - Re: [PATCH v20 7/9] mm: hugetlb: add a kernel parameter hugetlb_free

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Message-ID: <c1a3e914-e7f0-c92f-efd0-bdded6a412d8@oracle.com>
Date:   Mon, 19 Apr 2021 16:41:24 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Muchun Song <songmuchun@...edance.com>, corbet@....net,
        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,
        pawan.kumar.gupta@...ux.intel.com, rdunlap@...radead.org,
        oneukum@...e.com, anshuman.khandual@....com, jroedel@...e.de,
        almasrymina@...gle.com, rientjes@...gle.com, willy@...radead.org,
        osalvador@...e.de, mhocko@...e.com, song.bao.hua@...ilicon.com,
        david@...hat.com, naoya.horiguchi@....com,
        joao.m.martins@...cle.com
Cc:     duanxiongchun@...edance.com, fam.zheng@...edance.com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        Miaohe Lin <linmiaohe@...wei.com>,
        Chen Huang <chenhuang5@...wei.com>,
        Bodeddula Balasubramaniam <bodeddub@...zon.com>
Subject: Re: [PATCH v20 7/9] mm: hugetlb: add a kernel parameter
 hugetlb_free_vmemmap

On 4/15/21 1:40 AM, Muchun Song wrote:
> Add a kernel parameter hugetlb_free_vmemmap to enable the feature of
> freeing unused vmemmap pages associated with each hugetlb page on boot.
> 
> We disables PMD mapping of vmemmap pages for x86-64 arch when this
> feature is enabled. Because vmemmap_remap_free() depends on vmemmap
> being base page mapped.
> 
> Signed-off-by: Muchun Song <songmuchun@...edance.com>
> Reviewed-by: Oscar Salvador <osalvador@...e.de>
> Reviewed-by: Barry Song <song.bao.hua@...ilicon.com>
> Reviewed-by: Miaohe Lin <linmiaohe@...wei.com>
> Tested-by: Chen Huang <chenhuang5@...wei.com>
> Tested-by: Bodeddula Balasubramaniam <bodeddub@...zon.com>
> ---
>  Documentation/admin-guide/kernel-parameters.txt | 17 +++++++++++++++++
>  Documentation/admin-guide/mm/hugetlbpage.rst    |  3 +++
>  arch/x86/mm/init_64.c                           |  8 ++++++--
>  include/linux/hugetlb.h                         | 19 +++++++++++++++++++
>  mm/hugetlb_vmemmap.c                            | 24 ++++++++++++++++++++++++
>  5 files changed, 69 insertions(+), 2 deletions(-)

Thanks,

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