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1da177e Linux-2.6.12-rc2
Linus Torvalds authored
1 These instructions are deliberately very basic. If you want something clever,
2 go read the real docs ;-) Please don't add more stuff, but feel free to
3 correct my mistakes ;-) (mbligh@aracnet.com)
4 Thanks to John Levon, Dave Hansen, et al. for help writing this.
5
6 <test> is the thing you're trying to measure.
7 Make sure you have the correct System.map / vmlinux referenced!
8
9 It is probably easiest to use "make install" for linux and hack
10 /sbin/installkernel to copy vmlinux to /boot, in addition to vmlinuz,
11 config, System.map, which are usually installed by default.
12
13 Readprofile
14 -----------
15 A recent readprofile command is needed for 2.6, such as found in util-linux
16 2.12a, which can be downloaded from:
17
18 http://www.kernel.org/pub/linux/utils/util-linux/
19
20 Most distributions will ship it already.
21
22 Add "profile=2" to the kernel command line.
23
24 clear readprofile -r
25 <test>
26 dump output readprofile -m /boot/System.map > captured_profile
27
28 Oprofile
29 --------
0c0a400 [PATCH] oprofile: report anonymous region samples
John Levon authored
30
31 Get the source (see Changes for required version) from
32 http://oprofile.sourceforge.net/ and add "idle=poll" to the kernel command
33 line.
34
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
35 Configure with CONFIG_PROFILING=y and CONFIG_OPROFILE=y & reboot on new kernel
0c0a400 [PATCH] oprofile: report anonymous region samples
John Levon authored
36
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
37 ./configure --with-kernel-support
38 make install
39
40 For superior results, be sure to enable the local APIC. If opreport sees
41 a 0Hz CPU, APIC was not on. Be aware that idle=poll may mean a performance
42 penalty.
43
44 One time setup:
45 opcontrol --setup --vmlinux=/boot/vmlinux
46
47 clear opcontrol --reset
48 start opcontrol --start
49 <test>
50 stop opcontrol --stop
51 dump output opreport > output_file
52
0c0a400 [PATCH] oprofile: report anonymous region samples
John Levon authored
53 To only report on the kernel, run opreport -l /boot/vmlinux > output_file
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
54
55 A reset is needed to clear old statistics, which survive a reboot.
56
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