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mm: cma: use pageblock_order as the single alignment

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Now alloc_contig_range() works at pageblock granularity.  Change CMA
allocation, which uses alloc_contig_range(), to use pageblock_nr_pages
alignment.

Link: https://lkml.kernel.org/r/20220425143118.2850746-6-zi.yan@sent.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: David Hildenbrand <david@redhat.com>
Cc: Eric Ren <renzhengeek@gmail.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Zi Yan 2022-05-12 20:22:58 -07:00 committed by Andrew Morton
parent 6e263fff1d
commit 11ac3e87ce
3 changed files with 5 additions and 8 deletions
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4
include/linux/cma.h
View file

@ -17,11 +17,11 @@
#define CMA_MAX_NAME 64
/*
* TODO: once the buddy -- especially pageblock merging and alloc_contig_range()
* the buddy -- especially pageblock merging and alloc_contig_range()
* -- can deal with only some pageblocks of a higher-order page being
* MIGRATE_CMA, we can use pageblock_nr_pages.
*/
#define CMA_MIN_ALIGNMENT_PAGES MAX_ORDER_NR_PAGES
#define CMA_MIN_ALIGNMENT_PAGES pageblock_nr_pages
#define CMA_MIN_ALIGNMENT_BYTES (PAGE_SIZE * CMA_MIN_ALIGNMENT_PAGES)
struct cma;

5
include/linux/mmzone.h
View file

@ -54,10 +54,7 @@ enum migratetype {
*
* The way to use it is to change migratetype of a range of
* pageblocks to MIGRATE_CMA which can be done by
* __free_pageblock_cma() function. What is important though
* is that a range of pageblocks must be aligned to
* MAX_ORDER_NR_PAGES should biggest page be bigger than
* a single pageblock.
* __free_pageblock_cma() function.
*/
MIGRATE_CMA,
#endif

4
mm/page_alloc.c
View file

@ -9046,8 +9046,8 @@ int __alloc_contig_migrate_range(struct compact_control *cc,
* be either of the two.
* @gfp_mask: GFP mask to use during compaction
*
* The PFN range does not have to be pageblock or MAX_ORDER_NR_PAGES
* aligned. The PFN range must belong to a single zone.
* The PFN range does not have to be pageblock aligned. The PFN range must
* belong to a single zone.
*
* The first thing this routine does is attempt to MIGRATE_ISOLATE all
* pageblocks in the range. Once isolated, the pageblocks should not