Trying to use gprof on Chromium?

I want to use gprof to get a overview of how the CPU consumption is
distributed in my setup.

I added
CFLAGS+=-pg
CXXFLAGS+=-pg
LDFLAGS+=-lc_p
to the Makefile right after "include $(TOP)arch.mk", and then make
clean && make. Everything ran fine, but I got no gmon.out file.

I also added to the begining of options.mk
CFLAGS+=-pg
CXXFLAGS+=-pg
and got nothing as well.

What is the best way to profile Chromium for CPU usage? Will gprof work? How?

Thank you for your time,
James Steven Supancic III

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