lkml.org 
[lkml]   [2022]   [Jan]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v4 1/7] mm: page_alloc: avoid merging non-fallbackable pageblocks with others.
On Wed, Jan 19, 2022 at 02:06:17PM -0500, Zi Yan wrote:
> From: Zi Yan <ziy@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.GP3366@techsingularity.net/
>
> Signed-off-by: Zi Yan <ziy@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 <mgorman@techsingularity.net>

--
Mel Gorman
SUSE Labs

\
 
 \ /
  Last update: 2022-01-24 15:02    [W:0.115 / U:0.248 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site