+ mm-page_isolation-unset-migratetype-directly-for-non-buddy-page.patch added to -mm tree

[akpm@linux-foundation.org]

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@huawei.com>
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@suse.de: changelog tweak]
Link: https://lkml.kernel.org/r/20211229033649.2760586-1-chenwandun@huawei.com
Fixes: 3c605096d315 ("mm/page_alloc: restrict max order of merging on isolated pageblock")
Signed-off-by: Chen Wandun <chenwandun@huawei.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Wang Kefeng <wangkefeng.wang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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@huawei.com are

mm-page_isolation-unset-migratetype-directly-for-non-buddy-page.patch