* Fwd: [RFD]:Is there any method to snapshot all information from both tasks on cpus and cpus when kernel crash occurs
[not found] <544AFDF7.2070309@huawei.com>
@ 2014-10-25 1:38 ` Liu hua
0 siblings, 0 replies; only message in thread
From: Liu hua @ 2014-10-25 1:38 UTC (permalink / raw)
To: xiaofeng.yan, linux-kernel; +Cc: linux-arm-kernel
Hi all,
For arm32 platform. I want to know whether or not a mechanism in kernel can snapshot tasks and cpus
information as the follow. If not, such a mechanism can be accepted by kernel.
...
</module list>
<task info>
TASK: [pid 1], [tgid 1], [linuxrc] [state S] [policy 0] [cpu 3]
EIP address: [<401945a4>] 0x401945a4
r0 = ffffffff; r1 = 00000000
r2 = 00000000; r3 = 00000000
r4 = 00000000; r5 = 00000000
r6 = ffffffff; r7 = 00000072
r8 = 00000050; r9 = 00000000
r10 = beec1e34; fp = 00000000
ip = 00095414; sp = beec1bc8
lr = 00069f2c;pc = 401945a4
cpsr = 60000210;
[<c0cd9338>] (schedule+0x4fc/0x61c)
[<c0a56418>] (do_wait+0x1c0/0x22c)
[<c0a57670>] (sys_wait4+0xa0/0xc0)
[<c0a295c0>] (ret_fast_syscall+0x0/0x3c)
TASK: [pid 2], [tgid 2], [kthreadd] [state S] [policy 0] [cpu 1]
EIP address: [<c0a6ea94>] kthreadd+0x8c/0x14c
[<c0cd9338>] (schedule+0x4fc/0x61c)
[<c0a6ea94>] (kthreadd+0x8c/0x14c)
[<c0a2a7d8>] (kernel_thread_exit+0x0/0x8)
...
</task info>
<cpu info cpu_id = 0>
TASK: [pid 29666], [tgid 29666], [kstop/1] [state R] [policy 1] [cpu 1]
[<c0a31310>] (ksnapshot_unwind_backtrace.part.2+0x50/0x154)
[<bf068144>] (us_dump_stack+0x38/0x44 [rtos_snapshot])
[<bf068f34>] (snapshot_cpu_info+0x60/0x4a8 [rtos_snapshot])
[<bf068b84>] (ksnapshot_taskinfo_buffer+0x320/0x4a8 [rtos_snapshot])
[<bf071018>] (fiq_callcack_handler+0x18/0x30 [test_ks])
[<c0a2eddc>] (fiq_real_handle+0x24/0x30)
[<c0a2836c>] (do_IPI+0x64/0x1c0)
[<c0cdb8e4>] (__irq_svc+0x44/0xe0)
[<c0a90088>] (stop_cpu+0x104/0x124)
[<c0a6a670>] (worker_thread+0x1a4/0x248)
[<c0a6e7a4>] (kthread+0x78/0x84)
[<c0a2a7d8>] (kernel_thread_exit+0x0/0x8)
</cpu info>
...
<cpu info cpu_id = n>
...
</cpu info>
Thanks
Yan
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