From: Michal Hocko <mhocko@suse.com>
To: Mike Kravetz <mike.kravetz@oracle.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Roman Gushchin <guro@fb.com>, Shakeel Butt <shakeelb@google.com>,
Oscar Salvador <osalvador@suse.de>,
David Hildenbrand <david@redhat.com>,
Muchun Song <songmuchun@bytedance.com>,
David Rientjes <rientjes@google.com>,
Miaohe Lin <linmiaohe@huawei.com>,
Peter Zijlstra <peterz@infradead.org>,
Matthew Wilcox <willy@infradead.org>,
HORIGUCHI NAOYA <naoya.horiguchi@nec.com>,
"Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
Waiman Long <longman@redhat.com>, Peter Xu <peterx@redhat.com>,
Mina Almasry <almasrymina@google.com>,
Hillf Danton <hdanton@sina.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 8/8] hugetlb: add lockdep_assert_held() calls for hugetlb_lock
Date: Thu, 25 Mar 2021 12:22:00 +0100 [thread overview]
Message-ID: <YFxyWG1xBc2BlTUB@dhcp22.suse.cz> (raw)
In-Reply-To: <20210325002835.216118-9-mike.kravetz@oracle.com>
On Wed 24-03-21 17:28:35, Mike Kravetz wrote:
> After making hugetlb lock irq safe and separating some functionality
> done under the lock, add some lockdep_assert_held to help verify
> locking.
>
> Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: Michal Hocko <mhocko@suse.com>
> ---
> mm/hugetlb.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index e4c441b878f2..de5b3cf4a155 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1062,6 +1062,8 @@ static bool vma_has_reserves(struct vm_area_struct *vma, long chg)
> static void enqueue_huge_page(struct hstate *h, struct page *page)
> {
> int nid = page_to_nid(page);
> +
> + lockdep_assert_held(&hugetlb_lock);
> list_move(&page->lru, &h->hugepage_freelists[nid]);
> h->free_huge_pages++;
> h->free_huge_pages_node[nid]++;
> @@ -1073,6 +1075,7 @@ static struct page *dequeue_huge_page_node_exact(struct hstate *h, int nid)
> struct page *page;
> bool pin = !!(current->flags & PF_MEMALLOC_PIN);
>
> + lockdep_assert_held(&hugetlb_lock);
> list_for_each_entry(page, &h->hugepage_freelists[nid], lru) {
> if (pin && !is_pinnable_page(page))
> continue;
> @@ -1345,6 +1348,7 @@ static void remove_hugetlb_page(struct hstate *h, struct page *page,
> {
> int nid = page_to_nid(page);
>
> + lockdep_assert_held(&hugetlb_lock);
> if (hstate_is_gigantic(h) && !gigantic_page_runtime_supported())
> return;
>
> @@ -1690,6 +1694,7 @@ static struct page *remove_pool_huge_page(struct hstate *h,
> int nr_nodes, node;
> struct page *page = NULL;
>
> + lockdep_assert_held(&hugetlb_lock);
> for_each_node_mask_to_free(h, nr_nodes, node, nodes_allowed) {
> /*
> * If we're returning unused surplus pages, only examine
> @@ -1939,6 +1944,7 @@ static int gather_surplus_pages(struct hstate *h, long delta)
> long needed, allocated;
> bool alloc_ok = true;
>
> + lockdep_assert_held(&hugetlb_lock);
> needed = (h->resv_huge_pages + delta) - h->free_huge_pages;
> if (needed <= 0) {
> h->resv_huge_pages += delta;
> @@ -2032,6 +2038,7 @@ static void return_unused_surplus_pages(struct hstate *h,
> struct page *page, *t_page;
> struct list_head page_list;
>
> + lockdep_assert_held(&hugetlb_lock);
> /* Uncommit the reservation */
> h->resv_huge_pages -= unused_resv_pages;
>
> @@ -2527,6 +2534,7 @@ static void try_to_free_low(struct hstate *h, unsigned long count,
> struct list_head page_list;
> struct page *page, *next;
>
> + lockdep_assert_held(&hugetlb_lock);
> if (hstate_is_gigantic(h))
> return;
>
> @@ -2573,6 +2581,7 @@ static int adjust_pool_surplus(struct hstate *h, nodemask_t *nodes_allowed,
> {
> int nr_nodes, node;
>
> + lockdep_assert_held(&hugetlb_lock);
> VM_BUG_ON(delta != -1 && delta != 1);
>
> if (delta < 0) {
> --
> 2.30.2
>
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2021-03-25 11:22 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-25 0:28 [PATCH 0/8] make hugetlb put_page safe for all calling contexts Mike Kravetz
2021-03-25 0:28 ` [PATCH 1/8] mm: cma: introduce cma_release_nowait() Mike Kravetz
2021-03-25 9:39 ` Oscar Salvador
2021-03-25 9:45 ` Michal Hocko
2021-03-25 9:54 ` Oscar Salvador
2021-03-25 10:10 ` Michal Hocko
2021-03-25 10:11 ` Michal Hocko
2021-03-25 10:13 ` David Hildenbrand
2021-03-25 10:17 ` Oscar Salvador
2021-03-25 10:24 ` Michal Hocko
2021-03-25 9:56 ` David Hildenbrand
2021-03-25 10:22 ` Michal Hocko
2021-03-25 16:56 ` Mike Kravetz
2021-03-25 17:15 ` David Hildenbrand
2021-03-25 20:12 ` Minchan Kim
2021-03-25 23:19 ` Roman Gushchin
2021-03-25 23:49 ` Mike Kravetz
2021-03-26 21:32 ` Mike Kravetz
2021-03-29 7:46 ` Michal Hocko
2021-03-29 22:27 ` Mike Kravetz
2021-03-25 0:28 ` [PATCH 2/8] mm: hugetlb: don't drop hugetlb_lock around cma_release() call Mike Kravetz
2021-03-25 0:28 ` [PATCH 3/8] hugetlb: add per-hstate mutex to synchronize user adjustments Mike Kravetz
2021-03-25 10:47 ` Michal Hocko
2021-03-25 12:29 ` Oscar Salvador
2021-03-26 1:52 ` Miaohe Lin
2021-03-25 0:28 ` [PATCH 4/8] hugetlb: create remove_hugetlb_page() to separate functionality Mike Kravetz
2021-03-25 10:49 ` Michal Hocko
2021-03-26 2:10 ` Miaohe Lin
2021-03-26 19:57 ` Mike Kravetz
2021-03-27 1:40 ` Miaohe Lin
2021-03-27 6:36 ` [External] " Muchun Song
2021-03-25 0:28 ` [PATCH 5/8] hugetlb: call update_and_free_page without hugetlb_lock Mike Kravetz
2021-03-25 10:55 ` Michal Hocko
2021-03-25 17:12 ` Mike Kravetz
2021-03-25 19:39 ` Michal Hocko
2021-03-25 20:33 ` Mike Kravetz
2021-03-27 6:54 ` [External] " Muchun Song
2021-03-28 21:40 ` Mike Kravetz
2021-03-25 0:28 ` [PATCH 6/8] hugetlb: change free_pool_huge_page to remove_pool_huge_page Mike Kravetz
2021-03-25 11:06 ` Michal Hocko
2021-03-25 17:29 ` Mike Kravetz
2021-03-25 0:28 ` [PATCH 7/8] hugetlb: make free_huge_page irq safe Mike Kravetz
2021-03-25 11:21 ` Michal Hocko
2021-03-25 17:32 ` Mike Kravetz
2021-03-27 7:06 ` [External] " Muchun Song
2021-03-29 7:49 ` Michal Hocko
2021-03-29 22:44 ` Mike Kravetz
2021-03-25 0:28 ` [PATCH 8/8] hugetlb: add lockdep_assert_held() calls for hugetlb_lock Mike Kravetz
2021-03-25 11:22 ` Michal Hocko [this message]
2021-03-26 2:12 ` Miaohe Lin
2021-03-27 8:14 ` [External] " Muchun Song
2021-03-26 1:42 ` [PATCH 0/8] make hugetlb put_page safe for all calling contexts Miaohe Lin
2021-03-26 20:00 ` Mike Kravetz
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