Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.16 0832/1039] mm/page_isolation: unset migratetype directly for non Buddy page | Date | Mon, 24 Jan 2022 19:43:41 +0100 |
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From: Chen Wandun <chenwandun@huawei.com>
[ Upstream commit 721fb891ad0b3956d5c168b2931e3e5e4fb7ca40 ]
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> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- mm/page_isolation.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/page_isolation.c b/mm/page_isolation.c index f67c4c70f17f6..6a0ddda6b3c53 100644 --- a/mm/page_isolation.c +++ b/mm/page_isolation.c @@ -115,7 +115,7 @@ static void unset_migratetype_isolate(struct page *page, unsigned migratetype) * 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); } -- 2.34.1
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