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V" , Waiman Long , Peter Xu , Mina Almasry , Hillf Danton , Joonsoo Kim , Barry Song , Will Deacon , Andrew Morton , Mike Kravetz Subject: [PATCH v3 5/8] hugetlb: call update_and_free_page without hugetlb_lock Date: Tue, 30 Mar 2021 20:41:45 -0700 Message-Id: <20210331034148.112624-6-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210331034148.112624-1-mike.kravetz@oracle.com> References: <20210331034148.112624-1-mike.kravetz@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [50.38.35.18] X-ClientProxiedBy: CO2PR04CA0202.namprd04.prod.outlook.com (2603:10b6:104:5::32) 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 CO2PR04CA0202.namprd04.prod.outlook.com (2603:10b6:104:5::32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3977.26 via Frontend Transport; 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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 Acked-by: Michal Hocko Reviewed-by: Muchun Song Reviewed-by: Miaohe Lin --- mm/hugetlb.c | 31 ++++++++++++++++++++++++++----- 1 file changed, 26 insertions(+), 5 deletions(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 16beabbbbe49..ac4be941a3e5 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1451,16 +1451,18 @@ 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); } /* @@ -1741,7 +1743,13 @@ 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; } @@ -1810,8 +1818,9 @@ 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); @@ -2674,22 +2683,34 @@ static void try_to_free_low(struct hstate *h, unsigned long count, nodemask_t *nodes_allowed) { int i; + struct page *page, *next; + LIST_HEAD(page_list); if (hstate_is_gigantic(h)) return; + /* + * 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 = &h->hugepage_freelists[i]; list_for_each_entry_safe(page, next, freel, lru) { if (count >= 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, -- 2.30.2