mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-12 07:14:03 +08:00
0c0a400d1d
The below patch passes samples from anonymous regions to userspace instead of just dropping them. This provides the support needed for reporting anonymous-region code samples (today: basic accumulated results; later: Java and other dynamically compiled code). As this changes the format, an upgrade to the just-released 0.9 release of the userspace tools is required. This patch is based upon an earlier one by Will Cohen <wcohen@redhat.com> Signed-off-by: John Levon <levon@movementarian.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
57 lines
1.7 KiB
Plaintext
57 lines
1.7 KiB
Plaintext
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 ;-) (mbligh@aracnet.com)
|
|
Thanks to John Levon, Dave Hansen, et al. for help writing this.
|
|
|
|
<test> is the thing you're trying to measure.
|
|
Make sure you have the correct System.map / vmlinux referenced!
|
|
|
|
It is probably easiest to use "make install" for linux and hack
|
|
/sbin/installkernel to copy vmlinux to /boot, in addition to vmlinuz,
|
|
config, System.map, which are usually installed by default.
|
|
|
|
Readprofile
|
|
-----------
|
|
A recent readprofile command is needed for 2.6, such as found in util-linux
|
|
2.12a, which can be downloaded from:
|
|
|
|
http://www.kernel.org/pub/linux/utils/util-linux/
|
|
|
|
Most distributions will ship it already.
|
|
|
|
Add "profile=2" to the kernel command line.
|
|
|
|
clear readprofile -r
|
|
<test>
|
|
dump output readprofile -m /boot/System.map > captured_profile
|
|
|
|
Oprofile
|
|
--------
|
|
|
|
Get the source (see Changes for required version) from
|
|
http://oprofile.sourceforge.net/ and add "idle=poll" to the kernel command
|
|
line.
|
|
|
|
Configure with CONFIG_PROFILING=y and CONFIG_OPROFILE=y & reboot on new kernel
|
|
|
|
./configure --with-kernel-support
|
|
make install
|
|
|
|
For superior results, be sure to enable the local APIC. If opreport sees
|
|
a 0Hz CPU, APIC was not on. Be aware that idle=poll may mean a performance
|
|
penalty.
|
|
|
|
One time setup:
|
|
opcontrol --setup --vmlinux=/boot/vmlinux
|
|
|
|
clear opcontrol --reset
|
|
start opcontrol --start
|
|
<test>
|
|
stop opcontrol --stop
|
|
dump output opreport > output_file
|
|
|
|
To only report on the kernel, run opreport -l /boot/vmlinux > output_file
|
|
|
|
A reset is needed to clear old statistics, which survive a reboot.
|
|
|