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Re: How to track the functions in self-written module using SystemTap?
- From: Nan Xiao <xiaonan830818 at gmail dot com>
- To: "Frank Ch. Eigler" <fche at redhat dot com>
- Cc: David Smith <dsmith at redhat dot com>, systemtap at sourceware dot org
- Date: Tue, 1 Dec 2015 10:57:36 +0800
- Subject: Re: How to track the functions in self-written module using SystemTap?
- Authentication-results: sourceware.org; auth=none
- References: <CA+MhoaPMSTgpHCDjNhwcDkMaLryLy+F6tH6HNcrvDDF9bEbBbg at mail dot gmail dot com> <564B5A4C dot 1080302 at redhat dot com> <CA+MhoaNG0hENo=cnOrxogX2qofdQodh-sY7mbKoZabn+L5GgFg at mail dot gmail dot com> <564CD3C1 dot 2090900 at redhat dot com> <CA+MhoaPxCC1_CH86A7SuXaoNEJyzaRvv2wpha8shF4V8T9WeOQ at mail dot gmail dot com> <CA+MhoaPGgWuVCEnW8p6cvbN_6qFE1jeDjz+pYtDuCbL00b5Ong at mail dot gmail dot com> <564DE376 dot 3020104 at redhat dot com> <CA+MhoaPCnkDp=A8KD19g1J+Gu91Z=+re09i8xgbg8=DW++uegQ at mail dot gmail dot com> <565CC50B dot 90104 at redhat dot com> <CA+MhoaPHi6ORfgTtWu_Z09zLAcgaAEPO10vWFi1kNhvsS5V0Ow at mail dot gmail dot com> <y0mk2oync6p dot fsf at fche dot csb>
Hi Frank,
I have just tested it:
# dd if=kex of=/dev/null bs=101 count=1
0+1 records in
0+1 records out
100 bytes (100 B) copied, 0.00278675 s, 35.9 kB/s
But still nothing outputs:
# stap -v -e 'probe
module("/root/kernel/105.ops/kex.ko").function("*") { printf("%s\n",
ppfunc()) }'
Pass 1: parsed user script and 100 library script(s) using
210544virt/28008res/3036shr/25484data kb, in 110usr/50sys/162real ms.
Pass 2: analyzed script: 6 probe(s), 1 function(s), 0 embed(s), 0
global(s) using 370776virt/29748res/3596shr/26612data kb, in
30usr/760sys/802real ms.
Pass 3: using cached
/root/.systemtap/cache/5c/stap_5cfec0f637bce0fa61c51d4186192dd5_2853.c
Pass 4: using cached
/root/.systemtap/cache/5c/stap_5cfec0f637bce0fa61c51d4186192dd5_2853.ko
Pass 5: starting run.
Thanks!
Best Regards
Nan Xiao
On Tue, Dec 1, 2015 at 10:18 AM, Frank Ch. Eigler <fche@redhat.com> wrote:
> Nan Xiao <xiaonan830818@gmail.com> writes:
>
>> [...]
>> run "# stap -e 'probe
>> module("/root/kernel/105.ops/kex.ko").function("*") { printf("%s\n",
>> ppfunc()) }'", but
>> run "insmod kex.ko" & "rmmod kex" still outputs nothing.
>
> Xan you exercise kex.ko beyond just installing & removing it right
> away, while the systemtap script is probing it?
>
> - FChE