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| author | Hua Su <suhua.tanke@gmail.com> | 2024-10-21 13:11:51 +0800 |
|---|---|---|
| committer | Mike Rapoport (Microsoft) <rppt@kernel.org> | 2024-10-28 12:16:06 +0200 |
| commit | 98b7beba1ee6fb4ee755812e6c06cfc9084e7430 (patch) | |
| tree | 7336bf44776299d7c6215b6b7fab5b4eaa0dda56 /mm | |
| parent | 4bb21dbb6728fbe6cb7e2f7dc7e5388962c4125b (diff) | |
| download | linux-stable-98b7beba1ee6fb4ee755812e6c06cfc9084e7430.tar.gz linux-stable-98b7beba1ee6fb4ee755812e6c06cfc9084e7430.tar.bz2 linux-stable-98b7beba1ee6fb4ee755812e6c06cfc9084e7430.zip | |
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@gmail.com>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Link: https://lore.kernel.org/r/20241021051151.4664-1-suhua.tanke@gmail.com
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/mm_init.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/mm_init.c b/mm/mm_init.c index 253972926183..38ce5f45090e 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -723,6 +723,9 @@ static void __meminit init_reserved_page(unsigned long pfn, int nid) break; } __init_single_page(pfn_to_page(pfn), pfn, zid, nid); + + if (pageblock_aligned(pfn)) + set_pageblock_migratetype(pfn_to_page(pfn), MIGRATE_MOVABLE); } #else static inline void pgdat_set_deferred_range(pg_data_t *pgdat) {} |