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Diffstat (limited to 'HOWTO.md')
| -rw-r--r-- | HOWTO.md | 41 |
1 files changed, 8 insertions, 33 deletions
@@ -21,10 +21,10 @@ 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. -From there compiling the perf tools with `make -C tools/perf` will yield a -`perf` executable that will support CoreSight trace collection. Note that if -traces are to be decompressed *off* target, there is no need to download and -compile the openCSD library (on the target). +From there compiling the perf tools with `make -C tools/perf CORESIGHT=1` will +yield a `perf` executable that will support CoreSight trace collection. Note +that if traces are to be decompressed *off* target, there is no need to download +and compile the openCSD library (on the target). Before launching a trace run a sink that will collect trace data needs to be identified. All CoreSight blocks identified by the framework are registed in @@ -306,7 +306,7 @@ and needs to be installed on a system prior to compilation. Information about the status of the openCSD library on a system is given at compile time by the perf tools build script: - linaro@t430:~/linaro/linux-kernel$ make VF=1 -C tools/perf + linaro@t430:~/linaro/linux-kernel$ make CORESIGHT=1 VF=1 -C tools/perf Auto-detecting system features: ... dwarf: [ on ] ... dwarf_getlocations: [ on ] @@ -376,8 +376,8 @@ build script where to get the header file and libraries, namely CSINCLUDES and CSLIBS: linaro@t430:~/linaro/linux-kernel$ export CSINCLUDES=~/linaro/coresight/my-opencsd/decoder/include/ - linaro@t430:~/linaro/linux-kernel$ export CSLIBS=~/linaro/coresight/my-opencsd/decoder/lib/linux64-rel/ - linaro@t430:~/linaro/linux-kernel$ make VF=1 -C tools/perf + linaro@t430:~/linaro/linux-kernel$ export CSLIBS=~/linaro/coresight/my-opencsd/decoder/lib/builddir/ + linaro@t430:~/linaro/linux-kernel$ make CORESIGHT=1 VF=1 -C tools/perf This will have the effect of compiling and linking against the provided library. Since the system's openCSD library is in the loader's search patch the @@ -611,37 +611,12 @@ will add the --dump option to the end of the command line and run Generating coverage files for Feedback Directed Optimization: AutoFDO --------------------------------------------------------------------- -Below is an example of using ARM ETM for autoFDO. The updates to the perf -support for this is experimental and available on the 'autoFDO' branch of -the [perf-opencsd github repository][1]. - -It also requires autofdo (https://github.com/google/autofdo) and gcc version 5. The bubble -sort example is from the AutoFDO tutorial (https://gcc.gnu.org/wiki/AutoFDO/Tutorial). - - $ gcc-5 -O3 sort.c -o sort_optimized - $ taskset -c 2 ./sort_optimized - Bubble sorting array of 30000 elements - 5910 ms - - $ perf record -e cs_etm/@20070000.etr/u --per-thread taskset -c 2 ./sort - Bubble sorting array of 30000 elements - 12543 ms - [ perf record: Woken up 35 times to write data ] - [ perf record: Captured and wrote 69.640 MB perf.data ] - - $ perf inject -i perf.data -o inj.data --itrace=il64 --strip - $ create_gcov --binary=./sort --profile=inj.data --gcov=sort.gcov -gcov_version=1 - $ gcc-5 -O3 -fauto-profile=sort.gcov sort.c -o sort_autofdo - $ taskset -c 2 ./sort_autofdo - Bubble sorting array of 30000 elements - 5806 ms +See autofdo.md (@ref AutoFDO) for details and scripts. The Linaro CoreSight Team ------------------------- - Mike Leach -- Tor Jeremiassen -- Chunyan Zang - Mathieu Poirier |