linux-kernel - [PATCH] mm/hugetlb: avoid unnecessary hugetlb_acct

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Date:   Thu, 14 Jan 2021 06:31:40 -0500
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>, <mike.kravetz@...cle.com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH] mm/hugetlb: avoid unnecessary hugetlb_acct_memory() call

When gbl_reserve is 0, hugetlb_acct_memory() will do nothing except holding
and releasing hugetlb_lock.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/hugetlb.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 737b2dce19e6..fe2da9ad6233 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -5241,7 +5241,8 @@ long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
 	 * reservations to be released may be adjusted.
 	 */
 	gbl_reserve = hugepage_subpool_put_pages(spool, (chg - freed));
-	hugetlb_acct_memory(h, -gbl_reserve);
+	if (gbl_reserve)
+		hugetlb_acct_memory(h, -gbl_reserve);
 
 	return 0;
 }
-- 
2.19.1