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Diffstat (limited to 'tools/perf/Documentation/perf-ftrace.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-ftrace.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt index b77f58c4d2fd..3f3808e513fe 100644 --- a/tools/perf/Documentation/perf-ftrace.txt +++ b/tools/perf/Documentation/perf-ftrace.txt @@ -123,6 +123,10 @@ OPTIONS for 'perf ftrace trace' --graph-opts:: List of options allowed to set: + - args - Show function arguments. + - retval - Show function return value. + - retval-hex - Show function return value in hexadecimal format. + - retaddr - Show function return address. - nosleep-time - Measure on-CPU time only for function_graph tracer. - noirqs - Ignore functions that happen inside interrupt. - verbose - Show process names, PIDs, timestamps, etc. @@ -139,6 +143,12 @@ OPTIONS for 'perf ftrace latency' Set the function name to get the histogram. Unlike perf ftrace trace, it only allows single function to calculate the histogram. +-e:: +--events=:: + Set the pair of events to get the histogram. The histogram is calculated + by the time difference between the two events from the same thread. This + requires -b/--use-bpf option. + -b:: --use-bpf:: Use BPF to measure function latency instead of using the ftrace (it |