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Mon, 29 Mar 2021 23:24:31 +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 , Joonsoo Kim , Barry Song , Will Deacon , Andrew Morton , Mike Kravetz Subject: [PATCH v2 7/8] hugetlb: make free_huge_page irq safe Date: Mon, 29 Mar 2021 16:24:01 -0700 Message-Id: <20210329232402.575396-8-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210329232402.575396-1-mike.kravetz@oracle.com> References: <20210329232402.575396-1-mike.kravetz@oracle.com> Content-Type: text/plain X-Originating-IP: [50.38.35.18] X-ClientProxiedBy: MWHPR10CA0065.namprd10.prod.outlook.com (2603:10b6:300:2c::27) 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 MWHPR10CA0065.namprd10.prod.outlook.com (2603:10b6:300:2c::27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3977.25 via Frontend Transport; Mon, 29 Mar 2021 23:24:30 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 04329fb2-aae8-45b6-d8de-08d8f309ce82 X-MS-TrafficTypeDiagnostic: BY5PR10MB4148: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:1728; 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identity=mailfrom; envelope-from=""; helo=aserp2130.oracle.com; client-ip=141.146.126.79 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1617060287-141472 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: Commit c77c0a8ac4c5 ("mm/hugetlb: defer freeing of huge pages if in non-task context") was added to address the issue of free_huge_page being called from irq context. That commit hands off free_huge_page processing to a workqueue if !in_task. However, this doesn't cover all the cases as pointed out by 0day bot lockdep report [1]. : Possible interrupt unsafe locking scenario: : : CPU0 CPU1 : ---- ---- : lock(hugetlb_lock); : local_irq_disable(); : lock(slock-AF_INET); : lock(hugetlb_lock); : : lock(slock-AF_INET); Shakeel has later explained that this is very likely TCP TX zerocopy from hugetlb pages scenario when the networking code drops a last reference to hugetlb page while having IRQ disabled. Hugetlb freeing path doesn't disable IRQ while holding hugetlb_lock so a lock dependency chain can lead to a deadlock. This commit addresses the issue by doing the following: - Make hugetlb_lock irq safe. This is mostly a simple process of changing spin_*lock calls to spin_*lock_irq* calls. - Make subpool lock irq safe in a similar manner. - Revert the !in_task check and workqueue handoff. [1] https://lore.kernel.org/linux-mm/000000000000f1c03b05bc43aadc@google.= com/ Signed-off-by: Mike Kravetz Acked-by: Michal Hocko Reviewed-by: Muchun Song --- mm/hugetlb.c | 167 ++++++++++++++++---------------------------- mm/hugetlb_cgroup.c | 8 +-- 2 files changed, 66 insertions(+), 109 deletions(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index d3f3cb8766b8..bf36abc2305a 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -93,9 +93,10 @@ static inline bool subpool_is_free(struct hugepage_sub= pool *spool) return true; } =20 -static inline void unlock_or_release_subpool(struct hugepage_subpool *sp= ool) +static inline void unlock_or_release_subpool(struct hugepage_subpool *sp= ool, + unsigned long irq_flags) { - spin_unlock(&spool->lock); + spin_unlock_irqrestore(&spool->lock, irq_flags); =20 /* If no pages are used, and no other handles to the subpool * remain, give up any reservations based on minimum size and @@ -134,10 +135,12 @@ struct hugepage_subpool *hugepage_new_subpool(struc= t hstate *h, long max_hpages, =20 void hugepage_put_subpool(struct hugepage_subpool *spool) { - spin_lock(&spool->lock); + unsigned long flags; + + spin_lock_irqsave(&spool->lock, flags); BUG_ON(!spool->count); spool->count--; - unlock_or_release_subpool(spool); + unlock_or_release_subpool(spool, flags); } =20 /* @@ -156,7 +159,7 @@ static long hugepage_subpool_get_pages(struct hugepag= e_subpool *spool, if (!spool) return ret; =20 - spin_lock(&spool->lock); + spin_lock_irq(&spool->lock); =20 if (spool->max_hpages !=3D -1) { /* maximum size accounting */ if ((spool->used_hpages + delta) <=3D spool->max_hpages) @@ -183,7 +186,7 @@ static long hugepage_subpool_get_pages(struct hugepag= e_subpool *spool, } =20 unlock_ret: - spin_unlock(&spool->lock); + spin_unlock_irq(&spool->lock); return ret; } =20 @@ -197,11 +200,12 @@ static long hugepage_subpool_put_pages(struct hugep= age_subpool *spool, long delta) { long ret =3D delta; + unsigned long flags; =20 if (!spool) return delta; =20 - spin_lock(&spool->lock); + spin_lock_irqsave(&spool->lock, flags); =20 if (spool->max_hpages !=3D -1) /* maximum size accounting */ spool->used_hpages -=3D delta; @@ -222,7 +226,7 @@ static long hugepage_subpool_put_pages(struct hugepag= e_subpool *spool, * If hugetlbfs_put_super couldn't free spool due to an outstanding * quota reference, free it now. */ - unlock_or_release_subpool(spool); + unlock_or_release_subpool(spool, flags); =20 return ret; } @@ -1412,7 +1416,7 @@ struct hstate *size_to_hstate(unsigned long size) return NULL; } =20 -static void __free_huge_page(struct page *page) +void free_huge_page(struct page *page) { /* * Can't pass hstate in here because it is called from the @@ -1422,6 +1426,7 @@ static void __free_huge_page(struct page *page) int nid =3D page_to_nid(page); struct hugepage_subpool *spool =3D hugetlb_page_subpool(page); bool restore_reserve; + unsigned long flags; =20 VM_BUG_ON_PAGE(page_count(page), page); VM_BUG_ON_PAGE(page_mapcount(page), page); @@ -1450,7 +1455,7 @@ static void __free_huge_page(struct page *page) restore_reserve =3D true; } =20 - spin_lock(&hugetlb_lock); + spin_lock_irqsave(&hugetlb_lock, flags); ClearHPageMigratable(page); hugetlb_cgroup_uncharge_page(hstate_index(h), pages_per_huge_page(h), page); @@ -1461,67 +1466,19 @@ static void __free_huge_page(struct page *page) =20 if (HPageTemporary(page)) { remove_hugetlb_page(h, page, false); - spin_unlock(&hugetlb_lock); + spin_unlock_irqrestore(&hugetlb_lock, flags); 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); + spin_unlock_irqrestore(&hugetlb_lock, flags); update_and_free_page(h, page); } else { arch_clear_hugepage_flags(page); enqueue_huge_page(h, page); - spin_unlock(&hugetlb_lock); - } -} - -/* - * As free_huge_page() can be called from a non-task context, we have - * to defer the actual freeing in a workqueue to prevent potential - * hugetlb_lock deadlock. - * - * free_hpage_workfn() locklessly retrieves the linked list of pages to - * be freed and frees them one-by-one. As the page->mapping pointer is - * going to be cleared in __free_huge_page() anyway, it is reused as the - * llist_node structure of a lockless linked list of huge pages to be fr= eed. - */ -static LLIST_HEAD(hpage_freelist); - -static void free_hpage_workfn(struct work_struct *work) -{ - struct llist_node *node; - struct page *page; - - node =3D llist_del_all(&hpage_freelist); - - while (node) { - page =3D container_of((struct address_space **)node, - struct page, mapping); - node =3D node->next; - __free_huge_page(page); + spin_unlock_irqrestore(&hugetlb_lock, flags); } } -static DECLARE_WORK(free_hpage_work, free_hpage_workfn); - -void free_huge_page(struct page *page) -{ - /* - * Defer freeing if in non-task context to avoid hugetlb_lock deadlock. - */ - if (!in_task()) { - /* - * Only call schedule_work() if hpage_freelist is previously - * empty. Otherwise, schedule_work() had been called but the - * workfn hasn't retrieved the list yet. - */ - if (llist_add((struct llist_node *)&page->mapping, - &hpage_freelist)) - schedule_work(&free_hpage_work); - return; - } - - __free_huge_page(page); -} =20 static void prep_new_huge_page(struct hstate *h, struct page *page, int = nid) { @@ -1530,11 +1487,11 @@ static void prep_new_huge_page(struct hstate *h, = struct page *page, int nid) hugetlb_set_page_subpool(page, NULL); set_hugetlb_cgroup(page, NULL); set_hugetlb_cgroup_rsvd(page, NULL); - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); h->nr_huge_pages++; h->nr_huge_pages_node[nid]++; ClearHPageFreed(page); - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); } =20 static void prep_compound_gigantic_page(struct page *page, unsigned int = order) @@ -1780,7 +1737,7 @@ int dissolve_free_huge_page(struct page *page) if (!PageHuge(page)) return 0; =20 - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); if (!PageHuge(page)) { rc =3D 0; goto out; @@ -1797,7 +1754,7 @@ int dissolve_free_huge_page(struct page *page) * when it is dissolved. */ if (unlikely(!HPageFreed(head))) { - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); cond_resched(); =20 /* @@ -1821,12 +1778,12 @@ int dissolve_free_huge_page(struct page *page) } remove_hugetlb_page(h, page, false); h->max_huge_pages--; - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); update_and_free_page(h, head); return 0; } out: - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); return rc; } =20 @@ -1868,16 +1825,16 @@ static struct page *alloc_surplus_huge_page(struc= t hstate *h, gfp_t gfp_mask, if (hstate_is_gigantic(h)) return NULL; =20 - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); if (h->surplus_huge_pages >=3D h->nr_overcommit_huge_pages) goto out_unlock; - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); =20 page =3D alloc_fresh_huge_page(h, gfp_mask, nid, nmask, NULL); if (!page) return NULL; =20 - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); /* * We could have raced with the pool size change. * Double check that and simply deallocate the new page @@ -1887,7 +1844,7 @@ static struct page *alloc_surplus_huge_page(struct = hstate *h, gfp_t gfp_mask, */ if (h->surplus_huge_pages >=3D h->nr_overcommit_huge_pages) { SetHPageTemporary(page); - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); put_page(page); return NULL; } else { @@ -1896,7 +1853,7 @@ static struct page *alloc_surplus_huge_page(struct = hstate *h, gfp_t gfp_mask, } =20 out_unlock: - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); =20 return page; } @@ -1946,17 +1903,17 @@ struct page *alloc_buddy_huge_page_with_mpol(stru= ct hstate *h, struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_ni= d, nodemask_t *nmask, gfp_t gfp_mask) { - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); if (h->free_huge_pages - h->resv_huge_pages > 0) { struct page *page; =20 page =3D dequeue_huge_page_nodemask(h, gfp_mask, preferred_nid, nmask)= ; if (page) { - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); return page; } } - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); =20 return alloc_migrate_huge_page(h, gfp_mask, preferred_nid, nmask); } @@ -2004,7 +1961,7 @@ static int gather_surplus_pages(struct hstate *h, l= ong delta) =20 ret =3D -ENOMEM; retry: - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); for (i =3D 0; i < needed; i++) { page =3D alloc_surplus_huge_page(h, htlb_alloc_mask(h), NUMA_NO_NODE, NULL); @@ -2021,7 +1978,7 @@ static int gather_surplus_pages(struct hstate *h, l= ong delta) * After retaking hugetlb_lock, we need to recalculate 'needed' * because either resv_huge_pages or free_huge_pages may have changed. */ - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); needed =3D (h->resv_huge_pages + delta) - (h->free_huge_pages + allocated); if (needed > 0) { @@ -2061,12 +2018,12 @@ static int gather_surplus_pages(struct hstate *h,= long delta) enqueue_huge_page(h, page); } free: - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); =20 /* Free unnecessary surplus pages to the buddy allocator */ list_for_each_entry_safe(page, tmp, &surplus_list, lru) put_page(page); - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); =20 return ret; } @@ -2117,9 +2074,9 @@ static void return_unused_surplus_pages(struct hsta= te *h, } =20 out: - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); update_and_free_pages_bulk(h, &page_list); - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); } =20 =20 @@ -2464,7 +2421,7 @@ struct page *alloc_huge_page(struct vm_area_struct = *vma, if (ret) goto out_uncharge_cgroup_reservation; =20 - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); /* * glb_chg is passed to indicate whether or not a page must be taken * from the global free pool (global change). gbl_chg =3D=3D 0 indicat= es @@ -2472,7 +2429,7 @@ struct page *alloc_huge_page(struct vm_area_struct = *vma, */ page =3D dequeue_huge_page_vma(h, vma, addr, avoid_reserve, gbl_chg); if (!page) { - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); page =3D alloc_buddy_huge_page_with_mpol(h, vma, addr); if (!page) goto out_uncharge_cgroup; @@ -2480,7 +2437,7 @@ struct page *alloc_huge_page(struct vm_area_struct = *vma, SetHPageRestoreReserve(page); h->resv_huge_pages--; } - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); list_add(&page->lru, &h->hugepage_activelist); /* Fall through */ } @@ -2493,7 +2450,7 @@ struct page *alloc_huge_page(struct vm_area_struct = *vma, h_cg, page); } =20 - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); =20 hugetlb_set_page_subpool(page, spool); =20 @@ -2706,9 +2663,9 @@ static void try_to_free_low(struct hstate *h, unsig= ned long count, } =20 out: - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); update_and_free_pages_bulk(h, &page_list); - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); } #else static inline void try_to_free_low(struct hstate *h, unsigned long count= , @@ -2804,7 +2761,7 @@ static int set_max_huge_pages(struct hstate *h, uns= igned long count, int nid, */ if (hstate_is_gigantic(h) && !IS_ENABLED(CONFIG_CONTIG_ALLOC)) { if (count > persistent_huge_pages(h)) { - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); mutex_unlock(&h->resize_lock); NODEMASK_FREE(node_alloc_noretry); return -EINVAL; @@ -2834,14 +2791,14 @@ static int set_max_huge_pages(struct hstate *h, u= nsigned long count, int nid, * page, free_huge_page will handle it by freeing the page * and reducing the surplus. */ - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); =20 /* yield cpu to avoid soft lockup */ cond_resched(); =20 ret =3D alloc_pool_huge_page(h, nodes_allowed, node_alloc_noretry); - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); if (!ret) goto out; =20 @@ -2881,9 +2838,9 @@ static int set_max_huge_pages(struct hstate *h, uns= igned long count, int nid, list_add(&page->lru, &page_list); } /* free the pages after dropping lock */ - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); update_and_free_pages_bulk(h, &page_list); - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); =20 while (count < persistent_huge_pages(h)) { if (!adjust_pool_surplus(h, nodes_allowed, 1)) @@ -2891,7 +2848,7 @@ static int set_max_huge_pages(struct hstate *h, uns= igned long count, int nid, } out: h->max_huge_pages =3D persistent_huge_pages(h); - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); mutex_unlock(&h->resize_lock); =20 NODEMASK_FREE(node_alloc_noretry); @@ -3047,9 +3004,9 @@ static ssize_t nr_overcommit_hugepages_store(struct= kobject *kobj, if (err) return err; =20 - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); h->nr_overcommit_huge_pages =3D input; - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); =20 return count; } @@ -3636,9 +3593,9 @@ int hugetlb_overcommit_handler(struct ctl_table *ta= ble, int write, goto out; =20 if (write) { - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); h->nr_overcommit_huge_pages =3D tmp; - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); } out: return ret; @@ -3734,7 +3691,7 @@ static int hugetlb_acct_memory(struct hstate *h, lo= ng delta) if (!delta) return 0; =20 - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); /* * When cpuset is configured, it breaks the strict hugetlb page * reservation as the accounting is done on a global variable. Such @@ -3773,7 +3730,7 @@ static int hugetlb_acct_memory(struct hstate *h, lo= ng delta) return_unused_surplus_pages(h, (unsigned long) -delta); =20 out: - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); return ret; } =20 @@ -5837,7 +5794,7 @@ bool isolate_huge_page(struct page *page, struct li= st_head *list) { bool ret =3D true; =20 - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); if (!PageHeadHuge(page) || !HPageMigratable(page) || !get_page_unless_zero(page)) { @@ -5847,16 +5804,16 @@ bool isolate_huge_page(struct page *page, struct = list_head *list) ClearHPageMigratable(page); list_move_tail(&page->lru, list); unlock: - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); return ret; } =20 void putback_active_hugepage(struct page *page) { - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); SetHPageMigratable(page); list_move_tail(&page->lru, &(page_hstate(page))->hugepage_activelist); - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); put_page(page); } =20 @@ -5890,12 +5847,12 @@ void move_hugetlb_state(struct page *oldpage, str= uct page *newpage, int reason) */ if (new_nid =3D=3D old_nid) return; - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); if (h->surplus_huge_pages_node[old_nid]) { h->surplus_huge_pages_node[old_nid]--; h->surplus_huge_pages_node[new_nid]++; } - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); } } =20 diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c index 726b85f4f303..5383023d0cca 100644 --- a/mm/hugetlb_cgroup.c +++ b/mm/hugetlb_cgroup.c @@ -204,11 +204,11 @@ static void hugetlb_cgroup_css_offline(struct cgrou= p_subsys_state *css) do { idx =3D 0; for_each_hstate(h) { - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); list_for_each_entry(page, &h->hugepage_activelist, lru) hugetlb_cgroup_move_parent(idx, h_cg, page); =20 - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); idx++; } cond_resched(); @@ -784,7 +784,7 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, st= ruct page *newhpage) if (hugetlb_cgroup_disabled()) return; =20 - spin_lock(&hugetlb_lock); + spin_lock_irq(&hugetlb_lock); h_cg =3D hugetlb_cgroup_from_page(oldhpage); h_cg_rsvd =3D hugetlb_cgroup_from_page_rsvd(oldhpage); set_hugetlb_cgroup(oldhpage, NULL); @@ -794,7 +794,7 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, st= ruct page *newhpage) set_hugetlb_cgroup(newhpage, h_cg); set_hugetlb_cgroup_rsvd(newhpage, h_cg_rsvd); list_move(&newhpage->lru, &h->hugepage_activelist); - spin_unlock(&hugetlb_lock); + spin_unlock_irq(&hugetlb_lock); return; } =20 --=20 2.30.2