Profiling FreeBSD during Boot Time using pmcStat

I want to profile the FreeBSD Kernel Using pmcstat(8) from boot time. I tried kgmon but we can only use kgmon once the FreeBSD has booted up and we have the shell prompt. I tried enabling the options in the configuration file:
Code:
options         HWPMC_HOOKS 
device          hwpmc

after which I compiled the kernel, and rebooted the kernel. I then tried to check if pmcstat can work. I referred to http://software.intel.com/sites/default/files/profiling_debugging_freebsd_kernel_321772.pdf

Code:
% pmccontrol -L
pmccontrol: Initialization of the pmc(3) library failed: No such file or directory

I then tried

Code:
% sudo kldload pmc
kldload: can't load pmc: File exists

I think this output may be relevant :

Code:
% sudo kldstat
Id Refs Address            Size     Name
 1  105 0xffffffff80100000 c04cb8   kernel
 2    5 0xffffffff80d05000 2ca910   platform.ko
 3    8 0xffffffff82000000 498000   common_kmod.ko

Any pointers to using pmcstat, or using some other good profiling tool which can give time spent on every function from boot time would be very helpful.

Thanks,
Shehbaz
 
Thread moved to Development as I think it fits better. It may also get more "developer" views.
 
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