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SubjectRe: [patch] add /proc/pid/stack to dump task's stack trace

btw., the feature works beautifully:

task sleeping/blocked:

# cat /proc/1/stack
[<ffffffff802bfe75>] do_select+0x51a/0x582
[<ffffffff802c0059>] core_sys_select+0x17c/0x218
[<ffffffff802c0344>] sys_select+0x99/0xc1
[<ffffffff8020c23b>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff

task running on this CPU:

# cat /proc/self/stack
[<ffffffff80216f79>] save_stack_trace_tsk+0x26/0x44
[<ffffffff802f59a5>] proc_pid_stack+0x6e/0xd3
[<ffffffff802f6da3>] proc_info_read+0x68/0xba
[<ffffffff802b2f17>] vfs_read+0xa9/0xe3
[<ffffffff802b301f>] sys_read+0x4c/0x73
[<ffffffff8020c23b>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff

task running on another CPU in user-space:

# cat /proc/18579/stack
[<ffffffffffffffff>] 0xffffffffffffffff

task running on another CPU in kernel-space:

# cat /proc/18579/stack
[<ffffffff8026f111>] audit_syscall_exit+0x9c/0xed
[<ffffffff80214b49>] syscall_trace_leave+0x94/0xbb
[<ffffffffffffffff>] 0xffffffffffffffff

Ingo


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