On 2015/11/20 16:43, Tang Chen wrote: > Hi Shi, > > Would you please share where did you add the printk debug info ? > Sure, at the end of init_mem_mapping(), I add a new function, like arch_report_meminfo(), just change "seq_printf" to "printk". Thanks, Xishi Qiu > 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 >> >> >> . >> > > > . > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>