Re: [RFC 1/2] kernel patch for dump user space stack tool

From: Cong Wang
Date: Wed Apr 18 2012 - 23:51:43 EST

On 04/17/2012 10:37 PM, Tu, Xiaobing wrote:
Resend the patch because of the log is too long on a single line.

From: xiaobing tu<xiaobing.tu@xxxxxxxxx>

Here is the kernel patch for this tool, The idea is to output user space stack call-chain from
/proc/xxx/stack, currently, /proc/xxx/stack only output kernel stack call chain. We extend
it to output user space call chain in hex format

Can you teach me why we still need this as we have pstack?

~% pstack $$
#0 0x00000036ae2365da in sigsuspend () from /lib64/
#1 0x0000000000472c25 in signal_suspend ()
#2 0x0000000000443323 in ?? ()
#3 0x0000000000443be6 in waitjobs ()
#4 0x000000000042b6d3 in ?? ()
#5 0x000000000042c0bd in execlist ()
#6 0x000000000042c64f in execode ()
#7 0x000000000043cd32 in loop ()
#8 0x000000000043fb36 in zsh_main ()
#9 0x00000036ae22169d in __libc_start_main () from /lib64/
#10 0x000000000040e571 in _start ()

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