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V" , Waiman Long , Peter Xu , Mina Almasry , Andrew Morton , Mike Kravetz Subject: [RFC PATCH 4/8] hugetlb: call update_and_free_page without hugetlb_lock Date: Fri, 19 Mar 2021 15:42:05 -0700 Message-Id: <20210319224209.150047-5-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210319224209.150047-1-mike.kravetz@oracle.com> References: <20210319224209.150047-1-mike.kravetz@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [50.38.35.18] X-ClientProxiedBy: MWHPR07CA0013.namprd07.prod.outlook.com (2603:10b6:300:116::23) To BY5PR10MB4196.namprd10.prod.outlook.com (2603:10b6:a03:20d::23) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from monkey.oracle.com (50.38.35.18) by MWHPR07CA0013.namprd07.prod.outlook.com (2603:10b6:300:116::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3955.18 via Frontend Transport; Fri, 19 Mar 2021 22:42:32 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 3585576b-7cb5-4aee-63f8-08d8eb284908 X-MS-TrafficTypeDiagnostic: BYAPR10MB3160: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:5236; 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Change all callers to drop the lock before calling. With additional code modifications, this will allow loops which decrease the huge page pool to drop the hugetlb_lock with each page to reduce long hold times. The ugly unlock/lock cycle in free_pool_huge_page will be removed in a subsequent patch which restructures free_pool_huge_page. Signed-off-by: Mike Kravetz --- mm/hugetlb.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index ae185d3315e0..3028cf10d504 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1362,14 +1362,8 @@ static void update_and_free_page(struct hstate *h, struct page *page) 1 << PG_writeback); } if (hstate_is_gigantic(h)) { - /* - * Temporarily drop the hugetlb_lock, because - * we might block in free_gigantic_page(). - */ - spin_unlock(&hugetlb_lock); destroy_compound_gigantic_page(page, huge_page_order(h)); free_gigantic_page(page, huge_page_order(h)); - spin_lock(&hugetlb_lock); } else { __free_pages(page, huge_page_order(h)); } @@ -1435,16 +1429,18 @@ static void __free_huge_page(struct page *page) if (HPageTemporary(page)) { remove_hugetlb_page(h, page, false); + spin_unlock(&hugetlb_lock); update_and_free_page(h, page); } else if (h->surplus_huge_pages_node[nid]) { /* remove the page from active list */ remove_hugetlb_page(h, page, true); + spin_unlock(&hugetlb_lock); update_and_free_page(h, page); } else { arch_clear_hugepage_flags(page); enqueue_huge_page(h, page); + spin_unlock(&hugetlb_lock); } - spin_unlock(&hugetlb_lock); } /* @@ -1725,7 +1721,13 @@ static int free_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed, list_entry(h->hugepage_freelists[node].next, struct page, lru); remove_hugetlb_page(h, page, acct_surplus); + /* + * unlock/lock around update_and_free_page is temporary + * and will be removed with subsequent patch. + */ + spin_unlock(&hugetlb_lock); update_and_free_page(h, page); + spin_lock(&hugetlb_lock); ret = 1; break; } @@ -1794,8 +1796,9 @@ int dissolve_free_huge_page(struct page *page) } remove_hugetlb_page(h, page, false); h->max_huge_pages--; + spin_unlock(&hugetlb_lock); update_and_free_page(h, head); - rc = 0; + return 0; } out: spin_unlock(&hugetlb_lock); @@ -2572,7 +2575,9 @@ static void try_to_free_low(struct hstate *h, unsigned long count, remove_hugetlb_page(h, page, false); h->free_huge_pages--; h->free_huge_pages_node[page_to_nid(page)]--; + spin_unlock(&hugetlb_lock); update_and_free_page(h, page); + spin_lock(&hugetlb_lock); /* * update_and_free_page could have dropped lock so -- 2.30.2