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mm: page_alloc: batch vmstat updates in expand() 

expand() currently updates vmstat for every subpage.  This is unnecessary,
since they're all of the same zone and migratetype.

Count added pages locally, then do a single vmstat update.

Link: https://lkml.kernel.org/r/20240327190111.GC7597@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2024-03-27 15:01:11 -04:00 committed by Andrew Morton
parent e1f42a577f
commit 883dd161e9
1 changed files with 4 additions and 1 deletions
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5
mm/page_alloc.c
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@ -1335,6 +1335,7 @@ static inline void expand(struct zone *zone, struct page *page,
int low, int high, int migratetype)
{
unsigned long size = 1 << high;
unsigned long nr_added = 0;
while (high > low) {
high--;
@ -1350,9 +1351,11 @@ static inline void expand(struct zone *zone, struct page *page,
if (set_page_guard(zone, &page[size], high))
continue;
add_to_free_list(&page[size], zone, high, migratetype, false);
__add_to_free_list(&page[size], zone, high, migratetype, false);
set_buddy_order(&page[size], high);
nr_added += size;
}
account_freepages(zone, nr_added, migratetype);
}
static void check_new_page_bad(struct page *page)