diff options
Diffstat (limited to 'Documentation/basic_profiling.txt')
| -rw-r--r-- | Documentation/basic_profiling.txt | 56 |
1 files changed, 0 insertions, 56 deletions
diff --git a/Documentation/basic_profiling.txt b/Documentation/basic_profiling.txt deleted file mode 100644 index 8764e9f70821..000000000000 --- a/Documentation/basic_profiling.txt +++ /dev/null @@ -1,56 +0,0 @@ -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. - |