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mm/page_alloc: reword the comment of buddy_merge_likely()

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For page with order O, we are checking its order (O + 1)'s buddy.  If it
is free, we would like to put it to the tail and expect it would be merged
to a page with order (O + 2).

Reword the comment to reflect it.

Link: https://lkml.kernel.org/r/20240619010612.20740-4-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Wei Yang 2024-06-19 01:06:12 +00:00 committed by Andrew Morton
parent b719efa22d
commit 08af2c12e3
1 changed files with 3 additions and 3 deletions
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6
mm/page_alloc.c
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@ -712,12 +712,12 @@ static inline struct page *get_page_from_free_area(struct free_area *area,
}
/*
* If this is not the largest possible page, check if the buddy
* of the next-highest order is free. If it is, it's possible
* If this is less than the 2nd largest possible page, check if the buddy
* of the next-higher order is free. If it is, it's possible
* that pages are being freed that will coalesce soon. In case,
* that is happening, add the free page to the tail of the list
* so it's less likely to be used soon and more likely to be merged
* as a higher order page
* as a 2-level higher order page
*/
static inline bool
buddy_merge_likely(unsigned long pfn, unsigned long buddy_pfn,