From d3ec7b6e09e512ba902b86bcca2c512fb06d492f Mon Sep 17 00:00:00 2001
From: Wei Yang <richard.weiyang@linux.alibaba.com>
Date: Tue, 13 Oct 2020 16:56:27 -0700
Subject: [PATCH] mm/hugetlb: use list_splice to merge two list at once
Instead of add allocated file_region one by one to region_cache, we could
use list_splice to merge two list at once.
Also we know the number of entries in the list, increase the number
directly.
Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Link: https://lkml.kernel.org/r/20200831022351.20916-4-richard.weiyang@linux.alibaba.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
mm/hugetlb.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 39f86bbcb07e1..13dc0a4554004 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -443,11 +443,8 @@ static int allocate_file_region_entries(struct resv_map *resv,
spin_lock(&resv->lock);
- list_for_each_entry_safe(rg, trg, &allocated_regions, link) {
- list_del(&rg->link);
- list_add(&rg->link, &resv->region_cache);
- resv->region_cache_count++;
- }
+ list_splice(&allocated_regions, &resv->region_cache);
+ resv->region_cache_count += to_allocate;
}
return 0;
--
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