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    Subject[PATCH] documentation for basic guide to profiling
    I was trying to write some simple docs on how to do profiling for people 
    to use for really basic stuff. I got it all wrong, but John's kindly
    corrected it ;-) Andrew asked me to do this as a patch for the
    documentation directory ... feedback would be much appreciated
    (yes, it's oversimplified - it's meant to be).

    diff -urpN -X /home/fletch/.diff.exclude virgin/Documentation/basic_profiling.txt oprofile_doc/Documentation/basic_profiling.txt
    --- virgin/Documentation/basic_profiling.txt Wed Dec 31 16:00:00 1969
    +++ oprofile_doc/Documentation/basic_profiling.txt Fri Feb 28 00:05:59 2003
    @@ -0,0 +1,44 @@
    +These instructions are deliberately very basic. If you want something clever,
    +go read the real docs ;-) Please don't add more stuff, but feel free to
    +correct my mistakes ;-) (
    +Thanks to John Levon and Dave Hansen for help writing this.
    +<test> is the thing you're trying to measure.
    +Make sure you have the correct / vmlinux referenced!
    +IMHO it's easier to use "make install" for linux and hack /sbin/installkernel
    +to copy config files,, vmlinux to /boot.
    +get readprofile binary fixed for 2.5 / akpm's 2.5 patch from
    +add "profile=2" to the kernel command line.
    +clear echo 2 > /proc/profile
    + <test>
    +dump output readprofile -m /boot/ > catured_profile
    +get source (I use 0.5) from
    +add "poll=idle" to the kernel command line
    +Configure with CONFIG_PROFILING=y and CONFIG_OPROFILE=y & reboot on new kernel
    +./configure --with-kernel-support
    +make install
    +One time setup (pick appropriate one for your CPU):
    +P3 opcontrol --setup --vmlinux=/boot/vmlinux \
    + --ctr0-event=CPU_CLK_UNHALTED --ctr0-count=100000
    +Athalon opcontrol --setup --vmlinux=/boot/vmlinux \
    + --ctr0-event=RETIRED_INSNS --ctr0-count=100000
    +P4 opcontrol --setup --vmlinux=/boot/vmlinux \
    + --ctr0-event=GLOBAL_POWER_EVENTS \
    + --ctr0-unit-mask=1 --ctr0-count=100000
    +start daemon opcontrol --start-daemon
    +clear opcontrol --reset
    +start opcontrol --start
    + <test>
    +stop opcontrol --stop
    +dump output oprofpp -dl -i /boot/vmlinux > output_file
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