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); } _
