On Wed, Jan 19, 2022 at 02:06:17PM -0500, Zi Yan wrote: > From: Zi Yan <z...@nvidia.com> > > This is done in addition to MIGRATE_ISOLATE pageblock merge avoidance. > It prepares for the upcoming removal of the MAX_ORDER-1 alignment > requirement for CMA and alloc_contig_range(). > > MIGRARTE_HIGHATOMIC should not merge with other migratetypes like > MIGRATE_ISOLATE and MIGRARTE_CMA[1], so this commit prevents that too. > Also add MIGRARTE_HIGHATOMIC to fallbacks array for completeness. > > [1] > https://lore.kernel.org/linux-mm/20211130100853.gp3...@techsingularity.net/ > > Signed-off-by: Zi Yan <z...@nvidia.com> > > <SNIP> > > @@ -2484,6 +2483,7 @@ static int fallbacks[MIGRATE_TYPES][3] = { > [MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE, > MIGRATE_TYPES }, > [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, > MIGRATE_TYPES }, > [MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, > MIGRATE_TYPES }, > + [MIGRATE_HIGHATOMIC] = { MIGRATE_TYPES }, /* Never used */ > #ifdef CONFIG_CMA > [MIGRATE_CMA] = { MIGRATE_TYPES }, /* Never used */ > #endif
If it's never used, why is it added? Otherwise looks fine so Acked-by: Mel Gorman <mgor...@techsingularity.net> -- Mel Gorman SUSE Labs
