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Sun, 20 Oct 2024 22:12:25 -0700 (PDT) Received: from suhua-virtual-machine.localdomain ([183.197.220.47]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20e7f0de39fsm17607485ad.206.2024.10.20.22.12.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 20 Oct 2024 22:12:24 -0700 (PDT) From: Hua Su To: rppt@kernel.org, akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Hua Su Subject: [PATCH] memblock: uniformly initialize all reserved pages to MIGRATE_MOVABLE Date: Mon, 21 Oct 2024 13:11:51 +0800 Message-Id: <20241021051151.4664-1-suhua.tanke@gmail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 580A64000B X-Stat-Signature: 8f1t3qtnz91b3k1xf6phojbn1k8y6mo3 X-Rspam-User: X-HE-Tag: 1729487532-743471 X-HE-Meta: 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 d+f9ctx5 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 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: List-Subscribe: List-Unsubscribe: Currently when CONFIG_DEFERRED_STRUCT_PAGE_INIT is not set, the reserved pages are initialized to MIGRATE_MOVABLE by default in memmap_init. Reserved memory mainly store the metadata of struct page. When HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON=Y and hugepages are allocated, the HVO will remap the vmemmap virtual address range to the page which vmemmap_reuse is mapped to. The pages previously mapping the range will be freed to the buddy system. Before this patch: when CONFIG_DEFERRED_STRUCT_PAGE_INIT is not set, the freed memory was placed on the Movable list; When CONFIG_DEFERRED_STRUCT_PAGE_INIT=Y, the freed memory was placed on the Unmovable list. After this patch, the freed memory is placed on the Movable list regardless of whether CONFIG_DEFERRED_STRUCT_PAGE_INIT is set. Eg: Tested on a virtual machine(1000GB): Intel(R) Xeon(R) Platinum 8358P CPU After vm start: echo 500000 > /proc/sys/vm/nr_hugepages cat /proc/meminfo | grep -i huge HugePages_Total: 500000 HugePages_Free: 500000 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB Hugetlb: 1024000000 kB cat /proc/pagetypeinfo before： Free pages count per migrate type at order 0 1 2 3 4 5 6 7 8 9 10 … Node 0, zone Normal, type Unmovable 51 2 1 28 53 35 35 43 40 69 3852 Node 0, zone Normal, type Movable 6485 4610 666 202 200 185 208 87 54 2 240 Node 0, zone Normal, type Reclaimable 2 2 1 23 13 1 2 1 0 1 0 Node 0, zone Normal, type HighAtomic 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone Normal, type Isolate 0 0 0 0 0 0 0 0 0 0 0 Unmovable ≈ 15GB after： Free pages count per migrate type at order 0 1 2 3 4 5 6 7 8 9 10 … Node 0, zone Normal, type Unmovable 0 1 1 0 0 0 0 1 1 1 0 Node 0, zone Normal, type Movable 1563 4107 1119 189 256 368 286 132 109 4 3841 Node 0, zone Normal, type Reclaimable 2 2 1 23 13 1 2 1 0 1 0 Node 0, zone Normal, type HighAtomic 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone Normal, type Isolate 0 0 0 0 0 0 0 0 0 0 0 Signed-off-by: Hua Su --- mm/mm_init.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/mm_init.c b/mm/mm_init.c index 4ba5607aaf19..6dbf2df23eee 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -722,6 +722,10 @@ static void __meminit init_reserved_page(unsigned long pfn, int nid) if (zone_spans_pfn(zone, pfn)) break; } + + if (pageblock_aligned(pfn)) + set_pageblock_migratetype(pfn_to_page(pfn), MIGRATE_MOVABLE); + __init_single_page(pfn_to_page(pfn), pfn, zid, nid); } #else