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Fri, 9 Apr 2021 20:53:20 +0000 From: Mike Kravetz To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton Cc: Roman Gushchin , Michal Hocko , Shakeel Butt , Oscar Salvador , David Hildenbrand , Muchun Song , David Rientjes , Miaohe Lin , Peter Zijlstra , Matthew Wilcox , HORIGUCHI NAOYA , "Aneesh Kumar K . V" , Waiman Long , Peter Xu , Mina Almasry , Hillf Danton , Joonsoo Kim , Barry Song , Will Deacon , Mike Kravetz Subject: [PATCH v5 5/8] hugetlb: call update_and_free_page without hugetlb_lock Date: Fri, 9 Apr 2021 13:52:51 -0700 Message-Id: <20210409205254.242291-6-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210409205254.242291-1-mike.kravetz@oracle.com> References: <20210409205254.242291-1-mike.kravetz@oracle.com> Content-Type: text/plain X-Originating-IP: [50.38.35.18] X-ClientProxiedBy: CO1PR15CA0050.namprd15.prod.outlook.com (2603:10b6:101:1f::18) 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 CO1PR15CA0050.namprd15.prod.outlook.com (2603:10b6:101:1f::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4020.16 via Frontend Transport; Fri, 9 Apr 2021 20:53:18 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 40c6e501-ec51-4749-b8cd-08d8fb9981df X-MS-TrafficTypeDiagnostic: BY5PR10MB3972: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:3826; 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identity=mailfrom; envelope-from=""; helo=userp2120.oracle.com; client-ip=156.151.31.85 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1618001616-634283 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: With the introduction of remove_hugetlb_page(), there is no need for update_and_free_page to hold the hugetlb lock. 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 Acked-by: Michal Hocko Reviewed-by: Muchun Song Reviewed-by: Miaohe Lin Reviewed-by: Oscar Salvador --- mm/hugetlb.c | 31 ++++++++++++++++++++++++++----- 1 file changed, 26 insertions(+), 5 deletions(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 773081709916..d3e5e49bf687 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1444,16 +1444,18 @@ static void __free_huge_page(struct page *page) =20 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); } =20 /* @@ -1734,7 +1736,13 @@ static int free_pool_huge_page(struct hstate *h, n= odemask_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 =3D 1; break; } @@ -1803,8 +1811,9 @@ 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 =3D 0; + return 0; } out: spin_unlock(&hugetlb_lock); @@ -2557,22 +2566,34 @@ static void try_to_free_low(struct hstate *h, uns= igned long count, nodemask_t *nodes_allowed) { int i; + struct page *page, *next; + LIST_HEAD(page_list); =20 if (hstate_is_gigantic(h)) return; =20 + /* + * Collect pages to be freed on a list, and free after dropping lock + */ for_each_node_mask(i, *nodes_allowed) { - struct page *page, *next; struct list_head *freel =3D &h->hugepage_freelists[i]; list_for_each_entry_safe(page, next, freel, lru) { if (count >=3D h->nr_huge_pages) - return; + goto out; if (PageHighMem(page)) continue; remove_hugetlb_page(h, page, false); - update_and_free_page(h, page); + list_add(&page->lru, &page_list); } } + +out: + spin_unlock(&hugetlb_lock); + list_for_each_entry_safe(page, next, &page_list, lru) { + update_and_free_page(h, page); + cond_resched(); + } + spin_lock(&hugetlb_lock); } #else static inline void try_to_free_low(struct hstate *h, unsigned long count= , --=20 2.30.2