linux-kernel - Re: [PATCH V3] mm/page_alloc: Add alloc_contig

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Date:   Thu, 17 Oct 2019 22:03:31 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Anshuman Khandual <anshuman.khandual@....com>, <linux-mm@...ck.org>
CC:     Mike Kravetz <mike.kravetz@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>,
        David Rientjes <rientjes@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Oscar Salvador <osalvador@...e.de>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        "Dan Williams" <dan.j.williams@...el.com>,
        Pavel Tatashin <pavel.tatashin@...rosoft.com>,
        Matthew Wilcox <willy@...radead.org>,
        "David Hildenbrand" <david@...hat.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3] mm/page_alloc: Add alloc_contig_pages()

On 10/17/19 8:28 PM, Anshuman Khandual wrote:
> On 10/18/2019 02:44 AM, John Hubbard wrote:
>> On 10/17/19 1:24 AM, Anshuman Khandual wrote:
... 
> Yeah, it is bit non-trivial because v5 of the pgtable tests are still
> on the latest linux-next (20191015 or 20191017). You will need to
> revert the following patches.
> 
> 1. mm/hugetlb: make alloc_gigantic_page() available for general use
> 2. mm/debug: add tests validating architecture page table helpers
> 3. mm-debug-add-tests-validating-architecture-page-table-helpers-fix
> 
> and apply the following patch (https://patchwork.kernel.org/patch/11190213/)
> 
> 1. hugetlbfs: don't access uninitialized memmaps in pfn_range_valid_gigantic()
> 
> After which this particular patch here will apply cleanly. Hope this helps.
> 

Yes, that helps, I wouldn't have worked that out on my own. :)

I'm not sure if I'll have anything to add, but I do want to take a peek,
so I can try to keep up with how huge pages are evolving.

thanks,

John Hubbard
NVIDIA