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mm/page_alloc: avoid unneeded alike_pages calculation 

When free_pages is 0, alike_pages is not used.  So alike_pages calculation
can be avoided by checking free_pages early to save cpu cycles.  Also fix
typo 'comparable'.  It should be 'compatible' here.

Link: https://lkml.kernel.org/r/20230801123723.2225543-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2023-08-01 20:37:23 +08:00 committed by Andrew Morton
parent 549f5c771e
commit ebddd111fc
1 changed files with 5 additions and 6 deletions
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11
mm/page_alloc.c
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@ -1833,6 +1833,10 @@ static void steal_suitable_fallback(struct zone *zone, struct page *page,
free_pages = move_freepages_block(zone, page, start_type,
&movable_pages);
/* moving whole block can fail due to zone boundary conditions */
if (!free_pages)
goto single_page;
/*
* Determine how many pages are compatible with our allocation.
* For movable allocation, it's the number of movable pages which
@ -1854,14 +1858,9 @@ static void steal_suitable_fallback(struct zone *zone, struct page *page,
else
alike_pages = 0;
}
/* moving whole block can fail due to zone boundary conditions */
if (!free_pages)
goto single_page;
/*
* If a sufficient number of pages in the block are either free or of
* comparable migratability as our allocation, claim the whole block.
* compatible migratability as our allocation, claim the whole block.
*/
if (free_pages + alike_pages >= (1 << (pageblock_order-1)) ||
page_group_by_mobility_disabled)