The patch titled
Subject: mm/page_isolation: unset migratetype directly for non Buddy page
has been added to the -mm tree. Its filename is
mm-page_isolation-unset-migratetype-directly-for-non-buddy-page.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-page_isolation-unset-migratetype-directly-for-non-buddy-page.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-page_isolation-unset-migratetype-directly-for-non-buddy-page.patch
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------------------------------------------------------
From: Chen Wandun <chenwandun@xxxxxxxxxx>
Subject: mm/page_isolation: unset migratetype directly for non Buddy page
In unset_migratetype_isolate(), we can bypass the call to
move_freepages_block() for non-buddy pages.
It will save a few cpu cycles for some situations such as cma and hugetlb
when allocating continue pages, in these situation function
alloc_contig_pages will be called.
alloc_contig_pages
__alloc_contig_migrate_range
isolate_freepages_range ==> pages has been remove from buddy
undo_isolate_page_range
unset_migratetype_isolate ==> can directly set migratetype
[osalvador@xxxxxxx: changelog tweak]
Link: https://lkml.kernel.org/r/20211229033649.2760586-1-chenwandun@xxxxxxxxxx
Fixes: 3c605096d315 ("mm/page_alloc: restrict max order of merging on isolated pageblock")
Signed-off-by: Chen Wandun <chenwandun@xxxxxxxxxx>
Reviewed-by: Oscar Salvador <osalvador@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Wang Kefeng <wangkefeng.wang@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_isolation.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/page_isolation.c~mm-page_isolation-unset-migratetype-directly-for-non-buddy-page
+++ a/mm/page_isolation.c
@@ -115,7 +115,7 @@ static void unset_migratetype_isolate(st
* onlining - just onlined memory won't immediately be considered for
* allocation.
*/
- if (!isolated_page) {
+ if (!isolated_page && PageBuddy(page)) {
nr_pages = move_freepages_block(zone, page, migratetype, NULL);
__mod_zone_freepage_state(zone, nr_pages, migratetype);
}
_
Patches currently in -mm which might be from chenwandun@xxxxxxxxxx are
mm-page_isolation-unset-migratetype-directly-for-non-buddy-page.patch
