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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>
This commit is contained in:
Wei Yang 2020-10-13 16:56:27 -07:00 committed by Linus Torvalds
parent a1ddc2e825
commit d3ec7b6e09
1 changed files with 2 additions and 5 deletions
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7
mm/hugetlb.c
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@ -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;