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

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Date:	Thu, 19 Apr 2012 11:50:54 +0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	"Tu, Xiaobing" <xiaobing.tu@...el.com>
CC:	Lin Ming <mlin@...pku.edu.cn>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"yanmin_zhang@...ux.intel.com" <yanmin_zhang@...ux.intel.com>,
	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"Zuo, Jiao" <jiao.zuo@...el.com>
Subject: Re: [RFC 1/2] kernel patch for dump user space stack tool

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@...el.com>
>
> 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/libc.so.6
#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/libc.so.6
#10 0x000000000040e571 in _start ()

Thanks!
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