The patch titled
Subject: mm: page_alloc: batch vmstat updates in expand()
has been added to the -mm mm-unstable branch. Its filename is
mm-page_alloc-batch-vmstat-updates-in-expand.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_alloc-batch-vmstat-updates-in-expand.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: mm: page_alloc: batch vmstat updates in expand()
Date: Wed, 27 Mar 2024 15:01:11 -0400
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@xxxxxxxxxxx
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Suggested-by: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/mm/page_alloc.c~mm-page_alloc-batch-vmstat-updates-in-expand
+++ a/mm/page_alloc.c
@@ -1341,6 +1341,7 @@ static inline void expand(struct zone *z
int low, int high, int migratetype)
{
unsigned long size = 1 << high;
+ unsigned long nr_added = 0;
while (high > low) {
high--;
@@ -1356,9 +1357,11 @@ static inline void expand(struct zone *z
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)
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
mm-zswap-optimize-zswap-pool-size-tracking.patch
mm-zpool-return-pool-size-in-pages.patch
mm-page_alloc-remove-pcppage-migratetype-caching.patch
mm-page_alloc-optimize-free_unref_folios.patch
mm-page_alloc-fix-up-block-types-when-merging-compatible-blocks.patch
mm-page_alloc-move-free-pages-when-converting-block-during-isolation.patch
mm-page_alloc-fix-move_freepages_block-range-error.patch
mm-page_alloc-fix-freelist-movement-during-block-conversion.patch
mm-page_alloc-close-migratetype-race-between-freeing-and-stealing.patch
mm-page_isolation-prepare-for-hygienic-freelists.patch
mm-page_isolation-prepare-for-hygienic-freelists-fix.patch
mm-page_alloc-consolidate-free-page-accounting.patch
mm-page_alloc-consolidate-free-page-accounting-fix.patch
mm-page_alloc-consolidate-free-page-accounting-fix-2.patch
mm-page_alloc-batch-vmstat-updates-in-expand.patch
