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migrate: optimise alloc_migration_target()

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Extract the zone number directly from the folio instead of using the
folio's zone number to look up the zone and asking the zone what its
number is.

[ziy@nvidia.com: fix folio_zonenum() return type]
  Link: https://lkml.kernel.org/r/26E8FF35-503E-4F14-98F7-7B4FA25FBD37@nvidia.com
Link: https://lkml.kernel.org/r/20251106201452.2292631-2-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Zi Yan <ziy@nvidia.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Joshua Hahn <joshua.hahnjy@gmail.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Byungchul Park <byungchul@sk.com>
Cc: Gregory Price <gourry@gourry.net>
Cc: Ying Huang <ying.huang@linux.alibaba.com>
Cc: Alistair Popple <apopple@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle)
2025-11-06 20:14:49 +00:00
committed by Andrew Morton
parent e24f66e87b
commit c537f0dd30
1 changed files with 2 additions and 2 deletions
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4
mm/migrate.c
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@@ -2164,7 +2164,7 @@ struct folio *alloc_migration_target(struct folio *src, unsigned long private)
gfp_t gfp_mask;
unsigned int order = 0;
int nid;
int zidx;
enum zone_type zidx;
mtc = (struct migration_target_control *)private;
gfp_mask = mtc->gfp_mask;
@@ -2190,7 +2190,7 @@ struct folio *alloc_migration_target(struct folio *src, unsigned long private)
gfp_mask |= GFP_TRANSHUGE;
order = folio_order(src);
}
zidx = zone_idx(folio_zone(src));
zidx = folio_zonenum(src);
if (is_highmem_idx(zidx) || zidx == ZONE_MOVABLE)
gfp_mask |= __GFP_HIGHMEM;