debuginfo path

[Srinivasa DS]

Wenji Huang wrote:
> Hi,
> 
> The commit 921d61030221bc5ff27f8d63d3fa30e93f659484 made the debuginfo 
> path could be specified with absolute path.
> 
> But one question, How about relative path, which it will begin with?

No, one has set SYSTEMTAP_DEBUGINFO_PATH to absolute path, If this env 
variable is not set, behaviour of systemtap will remain same as before.
(like searching vmlinux in /boot,/lib/modules/`uname -r` etc).

> 
> And the update in debugpath.exp
> 
> [...]
>  set test "debugpath-good"
> 
> -spawn env SYSTEMTAP_DEBUGINFO_PATH=:/usr/lib/debug:build stap -e "probe 
> kernel.function(\"sys_open\") {}" -p2
> 
> +set uname [exec /bin/uname -r]
> 
> +spawn env SYSTEMTAP_DEBUGINFO_PATH=/lib/modules/$uname/build stap -e 
> "probe kernel.function(\"sys_open\") {}" -p2
> [...]
> 
> I think we need to cover the installed kernel-debuginfo case which will 
> put vmlinux under /usr/lib/debug/lib/modules/`uname -r`/

As we test these systemtap tests on -rc kernels(self built kernel), I 
thought it would be good to use  /lib/modules/$uname/build rather than 
/usr/lib/debug/lib/modules/`uname -r`/(as this dir is not created, when 
we compile selfbuilt kernel).

If you have idea on any other path where vmlinux of current compiled 
kernel can be found, Please let me know.

Thanks
  Srinivasa DS