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| author | Miles Chen <miles.chen@mediatek.com> | 2019-03-21 12:21:25 +0800 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2019-04-03 13:07:59 +0100 |
| commit | 19d6242ece1f35aa004a7da9adf52e0ec18a854e (patch) | |
| tree | 13f1ad64d7085ed81d14e4364bcdb741249591e2 /arch/arm64/mm | |
| parent | b1ce45e86b81e8ce354c47a7440d263e4cd5dc56 (diff) | |
| download | linux-19d6242ece1f35aa004a7da9adf52e0ec18a854e.tar.gz | |
arm64: setup min_low_pfn
When debugging with CONFIG_PAGE_OWNER, I noticed that the min_low_pfn
on arm64 is always zero and the page owner scanning has to start from zero.
We have to loop a while before we see the first valid pfn.
(see: read_page_owner())
Setup min_low_pfn to save some loops.
Before setting min_low_pfn:
[ 21.265602] min_low_pfn=0, *ppos=0
Page allocated via order 0, mask 0x100cca(GFP_HIGHUSER_MOVABLE)
PFN 262144 type Movable Block 512 type Movable Flags 0x8001e
referenced|uptodate|dirty|lru|swapbacked)
prep_new_page+0x13c/0x140
get_page_from_freelist+0x254/0x1068
__alloc_pages_nodemask+0xd4/0xcb8
After setting min_low_pfn:
[ 11.025787] min_low_pfn=262144, *ppos=0
Page allocated via order 0, mask 0x100cca(GFP_HIGHUSER_MOVABLE)
PFN 262144 type Movable Block 512 type Movable Flags 0x8001e
referenced|uptodate|dirty|lru|swapbacked)
prep_new_page+0x13c/0x140
get_page_from_freelist+0x254/0x1068
__alloc_pages_nodemask+0xd4/0xcb8
shmem_alloc_page+0x7c/0xa0
shmem_alloc_and_acct_page+0x124/0x1e8
shmem_getpage_gfp.isra.7+0x118/0x878
shmem_write_begin+0x38/0x68
Signed-off-by: Miles Chen <miles.chen@mediatek.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/mm')
| -rw-r--r-- | arch/arm64/mm/init.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index c29b17b520cd..43fa75601b3d 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -440,6 +440,7 @@ void __init bootmem_init(void) early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT); max_pfn = max_low_pfn = max; + min_low_pfn = min; arm64_numa_init(); /* |