From: zhong jiang <zhongjiang@huawei.com>
To: fengguang.wu@intel.com, dyoung@redhat.com,
Michal Hocko <mhocko@kernel.org>,
mgorman@techsingularity.net, David Rientjes <rientjes@google.com>,
Vlastimil Babka <vbabka@suse.cz>
Cc: Linux Memory Management List <linux-mm@kvack.org>
Subject: An question about too1/vm/page-types
Date: Fri, 22 Jul 2016 11:24:33 +0800 [thread overview]
Message-ID: <579191F1.1060407@huawei.com> (raw)
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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reply other threads:[~2016-07-22 3:31 UTC|newest]
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