Hi!
I am trying to profile my custom 2.6.37 linux kernel with
oprofile in centos 5.5, and i have encountered
the following problem.
(Before everyone starts shouting, I know that custom kernels are not
supported by centos team, however I really
need to run a modified version, due to a project concerning my MSc
thesis. So i hope for your understanding :-) .
I have build the kernel with the following flags:
CONFIG_DEBUG_KERNEL=y
CONFIG_OPROFILE=y
# CONFIG_OPROFILE_EVENT_MULTIPLEX is not set
CONFIG_HAVE_OPROFILE=y
CONFIG_FRAME_POINTER=y
CONFIG_KPROBES=y
CONFIG_HAVE_KPROBES=y
CONFIG_KPROBE_EVENT=y
CONFIG_SAMPLE_KPROBES=m
under various suggestions i have googled in the net. I run oprofile
using the following instructions:
#!/bin/bash
rm oprof_output.txt
/usr/bin/opcontrol --init
/usr/bin/opcontrol --setup --event=CPU_CLK_UNHALTED:100000:0:1:1
--vmlinux /usr/src/kernels/linux-2.6.37/vmlinux
/usr/bin/opcontrol --reset
/usr/bin/opcontrol --start
/usr/bin/opcontrol --stop
/usr/bin/opcontrol --dump
/usr/bin/opreport -f -a -l --symbols --image-path=/lib/modules/$(uname
-r)/kernel >> oprof_output.txt
My problem is that the output reported by a simple run contains many of
the following lines
304 304 26.0051 26.0051 /vmlinux-unknown
/vmlinux-unknown /vmlinux-unknown
186 490 15.9110 41.9162 /vmlinux-unknown
/bin/bash /vmlinux-unknown
any idea or suggestion as how to resolve the vmlinux-unknown problem? I
would gladly provide any
other information you may need.
Thanks in advance,
Yannis
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