From: Mathieu Poirier mathieu.poirier@linaro.org
Replacing all instances of numerical kernel versions with a generic 'master' notation.
Signed-off-by: Mathieu Poirier mathieu.poirier@linaro.org --- HOWTO.md | 34 +++++++++++++++++----------------- 1 file changed, 17 insertions(+), 17 deletions(-)
diff --git a/HOWTO.md b/HOWTO.md index 2a6be3d..596efab 100644 --- a/HOWTO.md +++ b/HOWTO.md @@ -7,16 +7,16 @@ This HOWTO explains how to use the perf cmd line tools and the openCSD library to collect and extract program flow traces generated by the CoreSight IP blocks on a Linux system. The examples have been generated using an aarch64 Juno-r0 platform. All information is considered accurate and tested -using library version v0.5 and the latest perf branch `perf-opencsd-4.9` -on the [OpenCSD github repository][1]. +using library version v0.5 and the `perf-opencsd-master` branch on the +[OpenCSD github repository][1].
On Target Trace Acquisition - Perf Record ----------------------------------------- All the enhancement to the Perf tools that support the new `cs_etm` pmu have not been upstreamed yet. To get the required functionality branch -`perf-opencsd-4.9` needs to be downloaded to the target system where -traces are to be collected. This branch is an upstream v4.9 kernel +`perf-opencsd-master` needs to be downloaded to the target system where +traces are to be collected. This branch is a vanilla upstream kernel supplemented with modifications to the CoreSight framework and drivers to be usable by the Perf core. The remaining out of tree patches are being upstreamed incrementally. @@ -277,14 +277,14 @@ the host's (which has nothing to do with the target) architecture: Off Target Perf Tools Compilation --------------------------------- As stated above not all the pieces of the solution have been upstreamed. To -get all the components branch `perf-opencsd-4.9` needs to be +get all the components the latest `perf-opencsd-master` needs to be obtained:
- linaro@t430:~/linaro/coresight$ git clone -b perf-opencsd-4.9 https://github.com/Linaro/OpenCSD.git perf-opencsd-4.9 + linaro@t430:~/linaro/coresight$ git clone -b perf-opencsd-master https://github.com/Linaro/OpenCSD.git perf-opencsd-master ... ...
- linaro@t430:~/linaro/coresight$ ls perf-opencsd-4.9/ + linaro@t430:~/linaro/coresight$ ls perf-opencsd-master/ arch certs CREDITS Documentation firmware include ipc Kconfig lib Makefile net REPORTING-BUGS scripts sound usr block COPYING crypto drivers fs init Kbuild kernel MAINTAINERS mm README samples security tools virt
@@ -295,12 +295,12 @@ successful, but handling of CoreSight trace data won't be supported.
**See perf-test-scripts below for assistance in creating a build and test enviroment.**
- linaro@t430:~/linaro/coresight$ cd perf-opencsd-4.9 + linaro@t430:~/linaro/coresight$ cd perf-opencsd-master linaro@t430:~/linaro/coresight/perf-opencsd-4.9$ export CSTRACE_PATH=~/linaro/coresight/my-opencsd/decoder linaro@t430:~/linaro/coresight/perf-opencsd-4.9$ make -C tools/perf ... ... - linaro@t430:~/linaro/coresight/perf-opencsd-4.9$ ls -l tools/perf/perf + linaro@t430:~/linaro/coresight/perf-opencsd-master ls -l tools/perf/perf -rwxrwxr-x 1 linaro linaro 6276360 Mar 3 10:05 tools/perf/perf
@@ -339,7 +339,7 @@ to be sure everything is clean. linaro@t430:~/linaro/coresight/sept20$ rm -rf ~/.debug linaro@t430:~/linaro/coresight/sept20$ cp -dpR .debug ~/ linaro@t430:~/linaro/coresight/sept20$ export LD_LIBRARY_PATH=~/linaro/coresight/my-opencsd/decoder/lib/linux64/dbg/ - linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-4.9/tools/perf/perf report --stdio + linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-master/tools/perf/perf report --stdio
# To display the perf.data header info, please use --header/--header-only options. # @@ -383,7 +383,7 @@ to be sure everything is clean.
Additional data can be obtained, which contains a dump of the trace packets received using the command
- mjl@ubuntu-vbox:./perf-opencsd-4.9/coresight/tools/perf/perf report --stdio --dump + mjl@ubuntu-vbox:./perf-opencsd-master/coresight/tools/perf/perf report --stdio --dump
resulting a large amount of data, trace looking like:-
@@ -432,10 +432,10 @@ Trace Decoding with Perf Script Working with perf scripts needs more command line options but yields interesting results.
- linaro@t430:~/linaro/coresight/sept20$ export EXEC_PATH=/home/linaro/coresight/perf-opencsd-4.9/tools/perf/ + linaro@t430:~/linaro/coresight/sept20$ export EXEC_PATH=/home/linaro/coresight/perf-opencsd-master/tools/perf/ linaro@t430:~/linaro/coresight/sept20$ export SCRIPT_PATH=$EXEC_PATH/scripts/python/ linaro@t430:~/linaro/coresight/sept20$ export XTOOL_PATH=/your/aarch64/toolchain/path/bin/ - linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-4.9/tools/perf/perf --exec-path=${EXEC_PATH} script --script=python:${SCRIPT_PATH}/cs-trace-disasm.py -- -d ${XTOOL_PATH}/aarch64-linux-gnu-objdump + linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-master/tools/perf/perf --exec-path=${EXEC_PATH} script --script=python:${SCRIPT_PATH}/cs-trace-disasm.py -- -d ${XTOOL_PATH}/aarch64-linux-gnu-objdump
7f89f24d80: 910003e0 mov x0, sp 7f89f24d84: 94000d53 bl 7f89f282d0 <free@plt+0x3790> @@ -467,18 +467,18 @@ Kernel Trace Decoding When dealing with kernel space traces the vmlinux file has to be communicated explicitely to perf using the "--vmlinux" command line option:
- linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-4.9/tools/perf/perf report --stdio --vmlinux=./vmlinux + linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-master/tools/perf/perf report --stdio --vmlinux=./vmlinux ... ... - linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-4.9/tools/perf/perf script --vmlinux=./vmlinux + linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-master/tools/perf/perf script --vmlinux=./vmlinux
When using scripts things get a little more convoluted. Using the same example an above but for traces but for kernel traces, the command line becomes:
- linaro@t430:~/linaro/coresight/sept20$ export EXEC_PATH=/home/linaro/coresight/perf-opencsd-4.9/tools/perf/ + linaro@t430:~/linaro/coresight/sept20$ export EXEC_PATH=/home/linaro/coresight/perf-opencsd-master/tools/perf/ linaro@t430:~/linaro/coresight/sept20$ export SCRIPT_PATH=$EXEC_PATH/scripts/python/ linaro@t430:~/linaro/coresight/sept20$ export XTOOL_PATH=/your/aarch64/toolchain/path/bin/ - linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-4.9/tools/perf/perf --exec-path=${EXEC_PATH} script \ + linaro@t430:~/linaro/coresight/sept20$ ../perf-opencsd-master/tools/perf/perf --exec-path=${EXEC_PATH} script \ --vmlinux=./vmlinux \ --script=python:${SCRIPT_PATH}/cs-trace-disasm.py -- \ -d ${XTOOLS_PATH}/aarch64-linux-gnu-objdump \