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Diffstat (limited to 'tools/perf/Documentation/perf-record.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-record.txt | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index d232b13ea713..02b4aa2621e7 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -88,6 +88,20 @@ OPTIONS If you want to profile write accesses in [0x1000~1008), just set 'mem:0x1000/8:w'. + - a BPF source file (ending in .c) or a precompiled object file (ending + in .o) selects one or more BPF events. + The BPF program can attach to various perf events based on the ELF section + names. + + When processing a '.c' file, perf searches an installed LLVM to compile it + into an object file first. Optional clang options can be passed via the + '--clang-opt' command line option, e.g.: + + perf record --clang-opt "-DLINUX_VERSION_CODE=0x50000" \ + -e tests/bpf-script-example.c + + Note: '--clang-opt' must be placed before '--event/-e'. + - a group of events surrounded by a pair of brace ("{event1,event2,...}"). Each event is separated by commas and the group should be quoted to prevent the shell interpretation. You also need to use --group on |