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Tue, 6 Jun 2023 04:57:11 +0000 (GMT) Received: from smtpav01.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3F27B5804B; Tue, 6 Jun 2023 04:57:06 +0000 (GMT) Received: from skywalker.in.ibm.com (unknown [9.109.204.255]) by smtpav01.wdc07v.mail.ibm.com (Postfix) with ESMTP; Tue, 6 Jun 2023 04:57:05 +0000 (GMT) From: "Aneesh Kumar K.V" To: linux-mm@kvack.org, akpm@linux-foundation.org, npiggin@gmail.com, christophe.leroy@csgroup.eu Subject: [PATCH 08/16] mm/vmemmap: Improve vmemmap_can_optimize and allow architectures to override Date: Tue, 6 Jun 2023 10:26:00 +0530 Message-Id: <20230606045608.55127-9-aneesh.kumar@linux.ibm.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230606045608.55127-1-aneesh.kumar@linux.ibm.com> References: <20230606045608.55127-1-aneesh.kumar@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: yoi9bSdF1pgFYpHOISmcr-QwzurbvXhy X-Proofpoint-ORIG-GUID: U6gP6qR3kkEN9BT2D9yMMZMHSAQSduY6 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26 definitions=2023-06-06_02,2023-06-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 mlxscore=0 phishscore=0 lowpriorityscore=0 adultscore=0 mlxlogscore=998 spamscore=0 bulkscore=0 impostorscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2304280000 definitions=main-2306060040 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Will Deacon , Muchun Song , "Aneesh Kumar K.V" , Catalin Marinas , Dan Williams , Oscar Salvador , linuxppc-dev@lists.ozlabs.org, Joao Martins , Mike Kravetz Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" dax vmemmap optimization requires a minimum of 2 PAGE_SIZE area within vmemmap such that tail page mapping can point to the second PAGE_SIZE area. Enforce that in vmemmap_can_optimize() function. Architectures like powerpc also want to enable vmemmap optimization conditionally (only with radix MMU translation). Hence allow architecture override. Signed-off-by: Aneesh Kumar K.V --- include/linux/mm.h | 30 ++++++++++++++++++++++++++---- mm/mm_init.c | 2 +- 2 files changed, 27 insertions(+), 5 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 27ce77080c79..9a45e61cd83f 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -31,6 +31,8 @@ #include #include +#include + struct mempolicy; struct anon_vma; struct anon_vma_chain; @@ -3550,13 +3552,33 @@ void vmemmap_free(unsigned long start, unsigned long end, struct vmem_altmap *altmap); #endif +#define VMEMMAP_RESERVE_NR 2 #ifdef CONFIG_ARCH_WANT_OPTIMIZE_VMEMMAP -static inline bool vmemmap_can_optimize(struct vmem_altmap *altmap, - struct dev_pagemap *pgmap) +static inline bool __vmemmap_can_optimize(struct vmem_altmap *altmap, + struct dev_pagemap *pgmap) { - return is_power_of_2(sizeof(struct page)) && - pgmap && (pgmap_vmemmap_nr(pgmap) > 1) && !altmap; + if (pgmap) { + unsigned long nr_pages; + unsigned long nr_vmemmap_pages; + + nr_pages = pgmap_vmemmap_nr(pgmap); + nr_vmemmap_pages = ((nr_pages * sizeof(struct page)) >> PAGE_SHIFT); + /* + * For vmemmap optimization with DAX we need minimum 2 vmemmap + * pages. See layout diagram in Documentation/mm/vmemmap_dedup.rst + */ + return is_power_of_2(sizeof(struct page)) && + (nr_vmemmap_pages > VMEMMAP_RESERVE_NR) && !altmap; + } + return false; } +/* + * If we don't have an architecture override, use the generic rule + */ +#ifndef vmemmap_can_optimize +#define vmemmap_can_optimize __vmemmap_can_optimize +#endif + #else static inline bool vmemmap_can_optimize(struct vmem_altmap *altmap, struct dev_pagemap *pgmap) diff --git a/mm/mm_init.c b/mm/mm_init.c index 7f7f9c677854..d1676afc94f1 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -1020,7 +1020,7 @@ static inline unsigned long compound_nr_pages(struct vmem_altmap *altmap, if (!vmemmap_can_optimize(altmap, pgmap)) return pgmap_vmemmap_nr(pgmap); - return 2 * (PAGE_SIZE / sizeof(struct page)); + return VMEMMAP_RESERVE_NR * (PAGE_SIZE / sizeof(struct page)); } static void __ref memmap_init_compound(struct page *head,