Re: [PATCH RFC 3/4] mm/page_alloc: always move pages to the tail of the freelist in unset_migratetype_isolate()
From: David Hildenbrand <hidden>
Date: 2020-09-18 07:31:10
Also in:
linux-acpi, linux-mm, lkml, xen-devel
On 18.09.20 04:29, Wei Yang wrote:
On Wed, Sep 16, 2020 at 08:34:10PM +0200, David Hildenbrand wrote:quoted
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