linux-kernel - Re: [PATCH V2] mm/page_alloc: Add alloc_contig

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Date:   Wed, 16 Oct 2019 16:43:57 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     David Hildenbrand <david@...hat.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>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] mm/page_alloc: Add alloc_contig_pages()



On 10/16/2019 04:39 PM, David Hildenbrand wrote:
> On 16.10.19 13:02, Anshuman Khandual wrote:
>> HugeTLB helper alloc_gigantic_page() implements fairly generic allocation
>> method where it scans over various zones looking for a large contiguous pfn
>> range before trying to allocate it with alloc_contig_range(). Other than
>> deriving the requested order from 'struct hstate', there is nothing HugeTLB
>> specific in there. This can be made available for general use to allocate
>> contiguous memory which could not have been allocated through the buddy
>> allocator.
>>
>> alloc_gigantic_page() has been split carving out actual allocation method
>> which is then made available via new alloc_contig_pages() helper wrapped
>> under CONFIG_CONTIG_ALLOC. All references to 'gigantic' have been replaced
>> with more generic term 'contig'. Allocated pages here should be freed with
>> free_contig_range() or by calling __free_page() on each allocated page.
>>
>> Cc: Mike Kravetz <mike.kravetz@...cle.com>
>> Cc: Andrew Morton <akpm@...ux-foundation.org>
>> Cc: Vlastimil Babka <vbabka@...e.cz>
>> Cc: Michal Hocko <mhocko@...e.com>
>> Cc: David Rientjes <rientjes@...gle.com>
>> Cc: Andrea Arcangeli <aarcange@...hat.com>
>> Cc: Oscar Salvador <osalvador@...e.de>
>> Cc: Mel Gorman <mgorman@...hsingularity.net>
>> Cc: Mike Rapoport <rppt@...ux.ibm.com>
>> Cc: Dan Williams <dan.j.williams@...el.com>
>> Cc: Pavel Tatashin <pavel.tatashin@...rosoft.com>
>> Cc: Matthew Wilcox <willy@...radead.org>
>> Cc: David Hildenbrand <david@...hat.com>
>> Cc: linux-kernel@...r.kernel.org
>> Acked-by: Michal Hocko <mhocko@...e.com>
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
>> ---
>> This is based on https://patchwork.kernel.org/patch/11190213/
>>
>> Changes in V2:
>>
>> - Rephrased patch subject per David
>> - Fixed all typos per David
>> - s/order/contiguous
> 
> Just to make sure, you ignored my comment regarding alignment although I explicitly mentioned it a second time? Thanks.

I had asked Michal explicitly what to be included for the respin. Anyways
seems like the previous thread is active again. I am happy to incorporate
anything new getting agreed on there.

- Anshuman