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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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