iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

mm: page_alloc: batch vmstat updates in expand()

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
mm/page_alloc.c
View File

@ -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)