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An question about too1/vm/page-types

DISCUSSION zhong jiang 1 participant 1 message Jul 22, 2016 Memory management

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zhong jiang

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Hi, guys

the page range from 160 to 192 corresponding to the physcial address from a0000 to bffff. That address space belongs to the PCI Bus we can get from the /proc/iomem. we konw that the region may exist valid page struct, but PG_RESERVED should be set. is right? but the actual is that page range is not any flag. I don't understand.

[root@localhost vm]# ./page-types -a 160,192
flags page-count MB symbolic-flags long-symbolic-flags

0x0000000000000000              32        0  __________________________________________
             total              32        0

[root@localhost vm]# cat /proc/iomem | head -n5
00000000-00000fff : reserved
00001000-0009a7ff : System RAM
0009a800-0009ffff : reserved
000a0000-000bffff : PCI Bus 0000:00
000c0000-000c7fff : Video ROM

Thanks
zhongjiang

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