Messages in this thread | | | Date | Fri, 25 Sep 2020 15:57:44 +0200 | From | Oscar Salvador <> | Subject | Re: [PATCH RFC 3/4] mm/page_alloc: always move pages to the tail of the freelist in unset_migratetype_isolate() |
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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. > > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com> > Cc: Mel Gorman <mgorman@techsingularity.net> > Cc: Michal Hocko <mhocko@kernel.org> > Cc: Dave Hansen <dave.hansen@intel.com> > Cc: Vlastimil Babka <vbabka@suse.cz> > Cc: Wei Yang <richard.weiyang@linux.alibaba.com> > Cc: Oscar Salvador <osalvador@suse.de> > Cc: Mike Rapoport <rppt@kernel.org> > Cc: Scott Cheloha <cheloha@linux.ibm.com> > Cc: Michael Ellerman <mpe@ellerman.id.au> > Signed-off-by: David Hildenbrand <david@redhat.com>
LGTM. Feel the same way about move_freepages_block_tail/move_freepages_block_tail wrappers, I think we are better off without them.
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Thanks
-- Oscar Salvador SUSE L3
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