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Message-ID: <20211229033649.2760586-1-chenwandun@huawei.com>
Date: Wed, 29 Dec 2021 11:36:49 +0800
From: Chen Wandun <chenwandun@...wei.com>
To: <akpm@...ux-foundation.org>, <vbabka@...e.cz>,
<iamjoonsoo.kim@....com>, <linux-mm@...ck.org>,
<linux-kernel@...r.kernel.org>
CC: <wangkefeng.wang@...wei.com>
Subject: [PATCH] mm/page_isolation: unset migratetype directly for non Buddy page
There is no need to try to move_freepages_block for pages that is not
in buddy in function unset_migratetype_isolate, it can directly set
migrate type.
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
Fixes: 3c605096d315 ("mm/page_alloc: restrict max order of merging on isolated pageblock")
Signed-off-by: Chen Wandun <chenwandun@...wei.com>
---
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 f67c4c70f17f..6a0ddda6b3c5 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);
}
--
2.18.0.huawei.25
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