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Thu, 25 Mar 2021 00:28:49 +0000 From: Mike Kravetz To: linux-mm@kvack.org, linux-kernel@vger.kernel.org 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 , Andrew Morton , Mike Kravetz Subject: [PATCH 0/8] make hugetlb put_page safe for all calling contexts Date: Wed, 24 Mar 2021 17:28:27 -0700 Message-Id: <20210325002835.216118-1-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.30.2 Content-Type: text/plain X-Originating-IP: [50.38.35.18] X-ClientProxiedBy: MWHPR15CA0042.namprd15.prod.outlook.com (2603:10b6:300:ad::28) 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 MWHPR15CA0042.namprd15.prod.outlook.com (2603:10b6:300:ad::28) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3977.24 via Frontend Transport; Thu, 25 Mar 2021 00:28:48 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 06a5e629-3656-452c-7129-08d8ef24f5c0 X-MS-TrafficTypeDiagnostic: SJ0PR10MB4462: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:9508; 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In subsequent discussions [2], it was deemed necessary to properly fix the hugetlb put_page path (free_huge_page). This RFC provides a possible way to address the issue. Comments are welcome/encouraged as several attempts at this have been made in the past. This series is based on v5.12-rc3-mmotm-2021-03-17-22-24. At a high level, the series provides: - Patches 1 & 2 from Roman Gushchin provide cma_release_nowait() - Patches 4, 5 & 6 are aimed at reducing lock hold times. To be clear the goal is to eliminate single lock hold times of a long duration. Overall lock hold time is not addressed. - Patch 7 makes hugetlb_lock and subpool lock IRQ safe. It also reverts the code which defers calls to a workqueue if !in_task. - Patch 8 adds some lockdep_assert_held() calls [1] https://lore.kernel.org/linux-mm/000000000000f1c03b05bc43aadc@google.= com/ [2] http://lkml.kernel.org/r/20210311021321.127500-1-mike.kravetz@oracle.= com RFC -> v1 - Add Roman's cma_release_nowait() patches. This eliminated the need to do a workqueue handoff in hugetlb code. - Use Michal's suggestion to batch pages for freeing. This eliminated the need to recalculate loop control variables when dropping the lock. - Added lockdep_assert_held() calls - Rebased to v5.12-rc3-mmotm-2021-03-17-22-24 Mike Kravetz (6): hugetlb: add per-hstate mutex to synchronize user adjustments hugetlb: create remove_hugetlb_page() to separate functionality hugetlb: call update_and_free_page without hugetlb_lock hugetlb: change free_pool_huge_page to remove_pool_huge_page hugetlb: make free_huge_page irq safe hugetlb: add lockdep_assert_held() calls for hugetlb_lock Roman Gushchin (2): mm: cma: introduce cma_release_nowait() mm: hugetlb: don't drop hugetlb_lock around cma_release() call include/linux/cma.h | 2 + include/linux/hugetlb.h | 1 + mm/cma.c | 93 +++++++++++ mm/cma.h | 5 + mm/hugetlb.c | 354 +++++++++++++++++++++------------------- mm/hugetlb_cgroup.c | 8 +- 6 files changed, 294 insertions(+), 169 deletions(-) --=20 2.30.2