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Khandual , Naoya Horiguchi , Barry Song , Michal Hocko , Matthew Wilcox , Xiongchun Duan , Andrew Morton , Mike Kravetz Subject: [PATCH v2 07/11] hugetlb: perform vmemmap restoration on a list of pages Date: Tue, 5 Sep 2023 14:44:06 -0700 Message-ID: <20230905214412.89152-8-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230905214412.89152-1-mike.kravetz@oracle.com> References: <20230905214412.89152-1-mike.kravetz@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: MW4PR03CA0148.namprd03.prod.outlook.com (2603:10b6:303:8c::33) To BY5PR10MB4196.namprd10.prod.outlook.com (2603:10b6:a03:20d::23) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BY5PR10MB4196:EE_|MW4PR10MB6395:EE_ X-MS-Office365-Filtering-Correlation-Id: 7cf5c1d3-30a9-4357-6258-08dbae594fb8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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MW4PR10MB6395 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-09-05_13,2023-09-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 phishscore=0 bulkscore=0 adultscore=0 suspectscore=0 malwarescore=0 spamscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2308100000 definitions=main-2309050189 X-Proofpoint-GUID: 4O-z_C99ESvs9HZN75xT3N3kckjoy8SA X-Proofpoint-ORIG-GUID: 4O-z_C99ESvs9HZN75xT3N3kckjoy8SA Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When removing hugetlb pages from the pool, we first create a list of removed pages and then free those pages back to low level allocators. Part of the 'freeing process' is to restore vmemmap for all base pages if necessary. Pass this list of pages to a new routine hugetlb_vmemmap_restore_folios() so that vmemmap restoration can be performed in bulk. Signed-off-by: Mike Kravetz --- mm/hugetlb.c | 3 +++ mm/hugetlb_vmemmap.c | 13 +++++++++++++ mm/hugetlb_vmemmap.h | 5 +++++ 3 files changed, 21 insertions(+) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 554be94b07bd..dd2dbc256172 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1838,6 +1838,9 @@ static void update_and_free_pages_bulk(struct hstate *h, struct list_head *list) { struct folio *folio, *t_folio; + /* First restore vmemmap for all pages on list. */ + hugetlb_vmemmap_restore_folios(h, list); + list_for_each_entry_safe(folio, t_folio, list, lru) { update_and_free_hugetlb_folio(h, folio, false); cond_resched(); diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c index ac5577d372fe..79de984919ef 100644 --- a/mm/hugetlb_vmemmap.c +++ b/mm/hugetlb_vmemmap.c @@ -481,6 +481,19 @@ int hugetlb_vmemmap_restore(const struct hstate *h, struct page *head) return ret; } +/* + * This function will attempt to resore vmemmap for a list of folios. There + * is no guarantee that restoration will be successful for all or any folios. + * This is used in bulk operations, and no feedback is given to the caller. + */ +void hugetlb_vmemmap_restore_folios(const struct hstate *h, struct list_head *folio_list) +{ + struct folio *folio; + + list_for_each_entry(folio, folio_list, lru) + (void)hugetlb_vmemmap_restore(h, &folio->page); +} + /* Return true iff a HugeTLB whose vmemmap should and can be optimized. */ static bool vmemmap_should_optimize(const struct hstate *h, const struct page *head) { diff --git a/mm/hugetlb_vmemmap.h b/mm/hugetlb_vmemmap.h index 036494e040ca..b4ee945dc1d4 100644 --- a/mm/hugetlb_vmemmap.h +++ b/mm/hugetlb_vmemmap.h @@ -12,6 +12,7 @@ #ifdef CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP int hugetlb_vmemmap_restore(const struct hstate *h, struct page *head); +void hugetlb_vmemmap_restore_folios(const struct hstate *h, struct list_head *folio_list); void hugetlb_vmemmap_optimize(const struct hstate *h, struct page *head); void hugetlb_vmemmap_optimize_folios(struct hstate *h, struct list_head *folio_list); @@ -44,6 +45,10 @@ static inline int hugetlb_vmemmap_restore(const struct hstate *h, struct page *h return 0; } +static inline void hugetlb_vmemmap_restore_folios(const struct hstate *h, struct list_head *folio_list) +{ +} + static inline void hugetlb_vmemmap_optimize(const struct hstate *h, struct page *head) { } -- 2.41.0