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Re: [PATCH RFC 3/4] mm/page_alloc: always move pages to the tail of the freelist in unset_migratetype_isolate()


  • To: Wei Yang <richard.weiyang@xxxxxxxxxxxxxxxxx>
  • From: David Hildenbrand <david@xxxxxxxxxx>
  • Date: Fri, 18 Sep 2020 09:30:54 +0200
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  • Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-acpi@xxxxxxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx>, Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Oscar Salvador <osalvador@xxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxx>, Scott Cheloha <cheloha@xxxxxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>
  • Delivery-date: Fri, 18 Sep 2020 07:31:06 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 18.09.20 04:29, Wei Yang wrote:
> On Wed, Sep 16, 2020 at 08:34:10PM +0200, David Hildenbrand wrote:
>> Page isolation doesn't actually touch the pages, it simply isolates
>> pageblocks and moves all free pages to the MIGRATE_ISOLATE freelist.
>>
>> We already place pages to the tail of the freelists when undoing
>> isolation via __putback_isolated_page(), let's do it in any case
>> (e.g., if order == pageblock_order) and document the behavior.
>>
>> This change results in all pages getting onlined via online_pages() to
>> be placed to the tail of the freelist.
> 
> I am sorry to not follow again. unset_migratetype_isolate() is used in
> __offline_pages if my understanding is correct. How does it contribute on
> online_pages? 

See -next / -mm, that should make it clearer.

-- 
Thanks,

David / dhildenb




 


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