linux-kernel - Re: [PATCH] hugetlb: simplify hugetlb handling in follow_page

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Message-ID: <362e6361-e2b7-16eb-83c8-203738f7b5d0@redhat.com>
Date:   Mon, 5 Sep 2022 18:09:04 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Mike Kravetz <mike.kravetz@...cle.com>
Cc:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        Michael Ellerman <mpe@...erman.id.au>,
        Muchun Song <songmuchun@...edance.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] hugetlb: simplify hugetlb handling in follow_page_mask

> Yes I think the assumption is correct for user pages hence for GUP.
> 
> By the way the discussion started with PTDUMP. For PTDUMP we need huge
> page directories to be taken into account. And for anything that
> involves kernel pages like VMAP or VMALLOC.

Yes, makes perfect sense to me now that you explained how/where hugepd 
is actually used -- thanks!

-- 
Thanks,

David / dhildenb