Re: [Crash-utility] Adding a new command rbtree
----- Original Message -----
The patch has been modified.
This command doesn't seem to work on RHEL5. When I try to mimic
the radix_tree example that your help page shows:
crash> help tree
...
Display radix tree's address and position information only:
crash> tree -t radix -o address_space.page_tree -p ffff88004e749de0
ffffea0000c3da60
position: root/0/0
ffffea0000062a48
position: root/0/1
ffffea0000062a10
position: root/0/2
ffffea0000c39f88
position: root/0/3
ffffea0000071ab0
position: root/0/4
...
The example above seems pretty straight-forward, where the address_space
structure has a radix_tree_root "page_tree" member:
crash> address_space.page_tree
struct address_space {
[0x8] struct radix_tree_root page_tree;
}
So if I pick out my own address_space structure by looking at the crash
utility's address space:
crash> vm -p
PID: 20739 TASK: ffff8100190330c0 CPU: 1 COMMAND: "crash"
MM PGD RSS TOTAL_VM
ffff81003ceaeb00 ffff810023f9f000 111440k 190736k
VMA START END FLAGS FILE
ffff8100346e88c8 400000 a32000 1875 /var/CVS/crash-6.0.6/crash
VIRTUAL PHYSICAL
400000 8d3e000
401000 3ec23000
402000 146a4000
...
If I do a "vtop" on the first user-space address above, its associated
address_space (page.mapping) is shown at the bottom:
crash> vtop 400000
VIRTUAL PHYSICAL
400000 8d3e000
PML: 23f9f000 => 2cda8067
PUD: 2cda8000 => 39f81067
PMD: 39f81010 => 1448d067
PTE: 1448d000 => 8d3e025
PAGE: 8d3e000
PTE PHYSICAL FLAGS
8d3e025 8d3e000 (PRESENT|USER|ACCESSED)
VMA START END FLAGS FILE
ffff8100346e88c8 400000 a32000 1875 /var/CVS/crash-6.0.6/crash
PAGE PHYSICAL MAPPING INDEX CNT FLAGS
ffff8100008d4590 8d3e000 ffff81001b23eb08 0 3 808000000086c
crash>
which shows this:
crash> address_space ffff81001b23eb08
struct address_space {
host = 0xffff81001b23e9f8,
page_tree = {
height = 0x2,
gfp_mask = 0x220,
rnode = 0xffff81001d52f0d0
},
...
But using your example to dump the pages in the address_space,
I always see something like this:
crash> tree -t radix -o address_space.page_tree -p ffff81001b23eb08
radix_tree_node at ffff81001d52f0d0
struct radix_tree_node {
count = 0x18,
slots = {0xffff81001fa7dce0, 0xffff810025e266d8, 0xffff81000c939718,
0xffff81000ac41718, 0xffff81002eba3b48, 0xffff81002fc73050
, 0xffff81000ee6d2a8, 0xffff81000842a2e8, 0xffff81000ed5f500, 0xffff81003246cda0,
0xffff810016305da0, 0xffff81002008dce0, 0xffff8
1001fb02970, 0xffff81002aa77ce0, 0xffff81003292f090, 0xffff8100071e28b0,
0xffff8100364b3050, 0xffff810026d72ac8, 0xffff81000d6b04
c0, 0xffff810033eda480, 0xffff81000bad1540, 0x0, 0xffff8100392786d8, 0x0,
0xffff810036a85758, 0xffff810031b92698, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
tags = {{0x0}, {0x0}}
}
tree: height 6251 is greater than height_to_maxindex[] index 12
crash>
What's going on there? It happens on all RHEL5 dumpfiles I test.
Dave