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Subject[PATCH v2 2/4] mm/compaction: merge end_pfn boundary check in isolate_freepages_range
Date
From: Kemeng Shi <shikemeng@huawei.com>

Merge the end_pfn boundary check for single page block forward and multiple
page blocks forward to avoid do twice boundary check for multiple page
blocks forward.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
---
mm/compaction.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index 61f56cee3715..b7a05b9843ed 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -735,8 +735,6 @@ isolate_freepages_range(struct compact_control *cc,
/* Protect pfn from changing by isolate_freepages_block */
unsigned long isolate_start_pfn = pfn;

- block_end_pfn = min(block_end_pfn, end_pfn);
-
/*
* pfn could pass the block_end_pfn if isolated freepage
* is more than pageblock order. In this case, we adjust
@@ -745,9 +743,10 @@ isolate_freepages_range(struct compact_control *cc,
if (pfn >= block_end_pfn) {
block_start_pfn = pageblock_start_pfn(pfn);
block_end_pfn = pageblock_end_pfn(pfn);
- block_end_pfn = min(block_end_pfn, end_pfn);
}

+ block_end_pfn = min(block_end_pfn, end_pfn);
+
if (!pageblock_pfn_to_page(block_start_pfn,
block_end_pfn, cc->zone))
break;
--
2.30.0
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