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mm: remove lru_add_drain_all in alloc_contig_range

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__alloc_contig_migrate_range already has lru_add_drain_all call via
migrate_prep.  It's necessary to move LRU taget pages into LRU list to be
able to isolated.  However, lru_add_drain_all call after
__alloc_contig_migrate_range is pointless since it has changed source page
freeing from putback_lru_pages to put_page[1].

This patch removes it.

[1] c6c919eb90, ("mm: use put_page() to free page instead of putback_lru_page()"

Link: https://lkml.kernel.org/r/20210303204512.2863087-1-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Minchan Kim 2021-04-29 23:01:01 -07:00 committed by Linus Torvalds
parent 77febec206
commit cef4c7d29d
1 changed files with 0 additions and 2 deletions
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2
mm/page_alloc.c
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@ -8649,8 +8649,6 @@ int alloc_contig_range(unsigned long start, unsigned long end,
* isolated thus they won't get removed from buddy.
*/
lru_add_drain_all();
order = 0;
outer_start = start;
while (!PageBuddy(pfn_to_page(outer_start))) {