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Message-Id: <20241021051151.4664-1-suhua.tanke@gmail.com>
Date: Mon, 21 Oct 2024 13:11:51 +0800
From: Hua Su <suhua.tanke@...il.com>
To: rppt@...nel.org,
akpm@...ux-foundation.org
Cc: linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Hua Su <suhua.tanke@...il.com>
Subject: [PATCH] memblock: uniformly initialize all reserved pages to MIGRATE_MOVABLE
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 <suhua.tanke@...il.com>
---
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
--
2.34.1
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