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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