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Tue, 15 Sep 2020 06:03:15 -0700 (PDT) From: Muchun Song To: corbet@lwn.net, mike.kravetz@oracle.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, viro@zeniv.linux.org.uk, akpm@linux-foundation.org, paulmck@kernel.org, mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com, rdunlap@infradead.org, oneukum@suse.com, anshuman.khandual@arm.com, jroedel@suse.de, almasrymina@google.com, rientjes@google.com Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Muchun Song Subject: [RFC PATCH 19/24] mm/hugetlb: Flush work when dissolving hugetlb page Date: Tue, 15 Sep 2020 20:59:42 +0800 Message-Id: <20200915125947.26204-20-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20200915125947.26204-1-songmuchun@bytedance.com> References: <20200915125947.26204-1-songmuchun@bytedance.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: 5367D3762D X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam02 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: We should flush work when dissolving a hugetlb page to make sure that the hugetlb page is freed to the buddy. Signed-off-by: Muchun Song --- mm/hugetlb.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 8666cedf9a7b..56c0bf2370ed 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1848,6 +1848,11 @@ static inline void free_gigantic_page_comm(struct = hstate *h, struct page *page) free_gigantic_page(page, huge_page_order(h)); } =20 +static inline void flush_free_huge_page_work(void) +{ + flush_work(&hpage_update_work); +} + static inline bool subpage_hwpoison(struct page *head, struct page *page= ) { return page_private(head + 4) =3D=3D page - head; @@ -1910,6 +1915,10 @@ static inline void free_gigantic_page_comm(struct = hstate *h, struct page *page) spin_lock(&hugetlb_lock); } =20 +static inline void flush_free_huge_page_work(void) +{ +} + static inline bool subpage_hwpoison(struct page *head, struct page *page= ) { return true; @@ -2484,6 +2493,7 @@ static int free_pool_huge_page(struct hstate *h, no= demask_t *nodes_allowed, int dissolve_free_huge_page(struct page *page) { int rc =3D -EBUSY; + bool need_flush =3D false; =20 /* Not to disrupt normal path by vainly holding hugetlb_lock */ if (!PageHuge(page)) @@ -2515,10 +2525,19 @@ int dissolve_free_huge_page(struct page *page) h->free_huge_pages_node[nid]--; h->max_huge_pages--; update_and_free_page(h, head); + need_flush =3D true; rc =3D 0; } out: spin_unlock(&hugetlb_lock); + + /* + * We should flush work before return to make sure that + * the hugetlb page is freed to the buddy. + */ + if (need_flush) + flush_free_huge_page_work(); + return rc; } =20 --=20 2.20.1