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SubjectRe: [patch] add /proc/pid/stack to dump task's stack trace
On Fri, Nov 07, 2008 at 10:03:04AM +0100, Ingo Molnar wrote:
>
> 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

so this file provides view of _kernel_ stack only?
shouldn't it be named kernel-stack then?

> 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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