Hi, Dave.
2006/08/04 13:55:33 -0400, Dave Anderson <anderson@xxxxxxxxxx> wrote:
>- Fix to address 2.6.18 and later Fedora 2.6.17-based kernel data
> structure name change from "runqueue" to "rq". This would cause
> crash to fail during initialization with a "crash: cannot determine
> idle task addresses from init_tasks[] or runqueues[]" message,
> followed by a red herring message: "crash: cannot resolve
> init_task_union". (haren@xxxxxxxxxx)
I tried doing "kmem -p" for the kdump dumpfile of linux-2.6.17 on
a x86_64smp system. As a result, crash command displayed the
following log.
-- log ------------------------------------------------------
crash> kmem -p
PAGE PHYSICAL MAPPING INDEX CNT FLAGS
kmem: WARNING: mem_map[] from 0 to 8000 not accessible
kmem: WARNING: mem_map[] from 1000 to 8000 not accessible
kmem: WARNING: mem_map[] from 2000 to 8000 not accessible
kmem: WARNING: mem_map[] from 3000 to 8000 not accessible
kmem: WARNING: mem_map[] from 4000 to 8000 not accessible
kmem: WARNING: mem_map[] from 5000 to 8000 not accessible
kmem: WARNING: mem_map[] from 6000 to 8000 not accessible
kmem: WARNING: mem_map[] from 7000 to 8000 not accessible
0 0 ------- ----- 0 0
40 1000 ------- ----- 0 0
80 2000 ------- ----- 0 0
c0 3000 ------- ----- 0 0
100 4000 ------- ----- 0 0
140 5000 ------- ----- 0 0
180 6000 ------- ----- 0 0
-------------------------------------------------------------
This problem occurred on a linux-2.6.18-rc3 system (x86_64smp).
nt->mem_map in dump_mem_map() was zero, because the above-mentioned
kernel didn't have necessary symbols(mem_map, pgdat_list, mem_section).
A symbol "pgdat_list" was removed by the following patch.
[PATCH] for_each_online_pgdat (take2) [5/5] remove pgdat_list
http://lkml.org/lkml/2006/2/25/8
But this kernel had two symbols(node_online_map, node_data).
Can we get the node_mem_map of each node by using these symbols?
Kernel gets the pglist_data of online nodes in next_online_pgdat() by
the following method.
1. get the online NODE-IDs from "node_online_map".
2. get "node_data[NODE_ID]" as the pglist_data of online nodes.
Thanks
Ken'ichi Ohmichi
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