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| author |   Jonathan Corbet <corbet@lwn.net> | 2016-10-26 16:22:01 -0600 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2016-10-27 16:36:50 -0600 |
| commit | 5700d1974818a98983e018efa01da9bc81b84e1a (patch) | |
| tree | 53dcae242692529c5e04f0357a21440fc8031adf /Documentation/admin-guide | |
| parent | docs: Get rid of the badRAM guide (diff) | |
| download | wireguard-linux-5700d1974818a98983e018efa01da9bc81b84e1a.tar.xz wireguard-linux-5700d1974818a98983e018efa01da9bc81b84e1a.zip | |
docs: Get rid of the "basic profiling" guide
The document has not been touched in over 11 years and doesn't reflect how
profiling is done in the perf era.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/basic-profiling.rst | 68 | ||||
| -rw-r--r-- | Documentation/admin-guide/index.rst | 1 |
2 files changed, 0 insertions, 69 deletions
diff --git a/Documentation/admin-guide/basic-profiling.rst b/Documentation/admin-guide/basic-profiling.rst deleted file mode 100644 index 72babc71b771..000000000000 --- a/Documentation/admin-guide/basic-profiling.rst +++ /dev/null @@ -1,68 +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. diff --git a/Documentation/admin-guide/index.rst b/Documentation/admin-guide/index.rst index d737ae71efc6..2872c0c70ea4 100644 --- a/Documentation/admin-guide/index.rst +++ b/Documentation/admin-guide/index.rst @@ -58,4 +58,3 @@ configure specific aspects of kernel behavior to your liking. binfmt-misc mono java - basic-profiling |