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| author | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-09-21 09:51:11 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-10-24 08:12:35 -0200 |
| commit | 9d85025b0418163fae079c9ba8f8445212de8568 (patch) | |
| tree | 4629e2dedf4a9ed45a6855c129101f9b52138372 /Documentation/basic_profiling.txt | |
| parent | 186128f75392f8478ad1b32a675627d738881ca4 (diff) | |
| download | op-kernel-dev-9d85025b0418163fae079c9ba8f8445212de8568.zip op-kernel-dev-9d85025b0418163fae079c9ba8f8445212de8568.tar.gz | |
docs-rst: create an user's manual book
Place README, REPORTING-BUGS, SecurityBugs and kernel-parameters
on an user's manual book.
As we'll be numbering the user's manual, remove the manual
numbering from SecurityBugs.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'Documentation/basic_profiling.txt')
| -rw-r--r-- | Documentation/basic_profiling.txt | 69 |
1 files changed, 0 insertions, 69 deletions
diff --git a/Documentation/basic_profiling.txt b/Documentation/basic_profiling.txt deleted file mode 100644 index 15a49db..0000000 --- a/Documentation/basic_profiling.txt +++ /dev/null @@ -1,69 +0,0 @@ -Basic kernel profiling -====================== - - -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. - -Some ``readprofile`` commands:: - - 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 - -Some ``opcontrol`` commands:: - - 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. - |
