Hi Shi,
Would you please share where did you add the printk debug info ?
Thanks. :)
On 11/20/2015 04:17 PM, Xishi Qiu wrote:
I find the direct mapping count in /proc/meminfo is error.
The value should be equal to the size of init_memory_mapping which
showed in boot log.
I add some print to show direct_pages_count[] immediately after
init_memory_mapping(). The reason is that we double counting.
Here is the log(kernel v4.4):
...
[ 0.000000] init_memory_mapping: [mem 0x00000000-0x000fffff] // called from
"init_memory_mapping(0, ISA_END_ADDRESS);"
[ 0.000000] [mem 0x00000000-0x000fffff] page 4k
[ 0.000000] BRK [0x01ebf000, 0x01ebffff] PGTABLE
[ 0.000000] BRK [0x01ec0000, 0x01ec0fff] PGTABLE
[ 0.000000] BRK [0x01ec1000, 0x01ec1fff] PGTABLE
[ 0.000000] init_memory_mapping: [mem 0xc3fe00000-0xc3fffffff] // called from
"memory_map_top_down(ISA_END_ADDRESS, end);"
[ 0.000000] [mem 0xc3fe00000-0xc3fffffff] page 1G // increase count of
PG_LEVEL_1G in c00000000(48G)-c3fffffff(49G) one time
[ 0.000000] init_memory_mapping: [mem 0xc20000000-0xc3fdfffff]
[ 0.000000] [mem 0xc20000000-0xc3fdfffff] page 1G // increase count of
PG_LEVEL_1G in c00000000(48G)-c3fffffff(49G) two time
[ 0.000000] init_memory_mapping: [mem 0x00100000-0xbf78ffff]
[ 0.000000] [mem 0x00100000-0x001fffff] page 4k
[ 0.000000] [mem 0x00200000-0x3fffffff] page 2M
[ 0.000000] [mem 0x40000000-0x7fffffff] page 1G
[ 0.000000] [mem 0x80000000-0xbf5fffff] page 2M
[ 0.000000] [mem 0xbf600000-0xbf78ffff] page 4k
[ 0.000000] init_memory_mapping: [mem 0x100000000-0xc1fffffff]
[ 0.000000] [mem 0x100000000-0xc1fffffff] page 1G // increase count of
PG_LEVEL_1G in c00000000(48G)-c3fffffff(49G) three time
...
[ 0.000000] DirectMap4k: 3648 kB
[ 0.000000] DirectMap2M: 2084864 kB
[ 0.000000] DirectMap1G: 50331648 kB
euler-linux:~ # cat /proc/meminfo | grep DirectMap
DirectMap4k: 91712 kB
DirectMap2M: 4093952 kB
DirectMap1G: 48234496 kB
total DirectMap is 48234496 + 4093952 + 91712 = 52420160kb
50331648 + 2084864 + 3648 = 52420160kb
total init_memory_mapping is 50323008kb
52420160kb - 50323008kb = 2097152kb = 2G
However I haven't find a better way to fix it, any ideas?
Thanks,
Xishi Qiu
.
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