Messages in this thread Patch in this message | | | From | Changbin Du <> | Subject | [PATCH 18/19] perf ftrace: add option --latency-format to display more info about delay | Date | Sun, 10 May 2020 23:06:27 +0800 |
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This is for the function graph tracer to display more info about latency. The execution context is shown in this case.
$ sudo perf ftrace -G --latency-format \# tracer: function_graph \# 1) .... | 0.992 us | mutex_unlock(); 1) .... | 1.404 us | __fsnotify_parent(); 1) .... | 1.023 us | fsnotify(); 1) .... | 0.335 us | __sb_end_write(); 1) d... | 0.439 us | fpregs_assert_state_consistent(); 1) d... | | do_syscall_64() { 1) .... | | __x64_sys_close() {
Signed-off-by: Changbin Du <changbin.du@gmail.com> --- tools/perf/builtin-ftrace.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index d376b37c53fc..fd8e2f305136 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -44,6 +44,7 @@ struct perf_ftrace { bool nosleep_time; bool nofuncgraph_irqs; bool funcgraph_tail; + bool latency_format; bool long_info; unsigned tracing_thresh; bool trace_children; @@ -217,6 +218,7 @@ static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused) write_tracing_option_file("sleep-time", "1"); write_tracing_option_file("funcgraph-irqs", "1"); write_tracing_option_file("funcgraph-tail", "0"); + write_tracing_option_file("latency-format", "0"); write_tracing_option_file("funcgraph-proc", "0"); write_tracing_option_file("funcgraph-abstime", "0"); write_tracing_option_file("irq-info", "0"); @@ -456,6 +458,17 @@ static int set_tracing_funcgraph_tail(struct perf_ftrace *ftrace) return 0; } +static int set_tracing_latency_format(struct perf_ftrace *ftrace) +{ + if (!ftrace->latency_format) + return 0; + + if (write_tracing_option_file("latency-format", "1") < 0) + return -1; + + return 0; +} + static int set_tracing_trace_children(struct perf_ftrace *ftrace) { if (!ftrace->trace_children) @@ -579,6 +592,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) goto out_reset; } + if (set_tracing_latency_format(ftrace) < 0) { + pr_err("failed to set tracing option latency-format\n"); + goto out_reset; + } + if (set_tracing_trace_children(ftrace) < 0) { pr_err("failed to set tracing option function-fork\n"); goto out_reset; @@ -748,6 +766,8 @@ int cmd_ftrace(int argc, const char **argv) "Ignore functions that happen inside interrupt (function_graph only)"), OPT_BOOLEAN(0, "funcgraph-tail", &ftrace.funcgraph_tail, "Show function tails comment (function_graph only)"), + OPT_BOOLEAN(0, "latency-format", &ftrace.latency_format, + "displays additional information about the latency (function_graph only)"), OPT_BOOLEAN('l', "long-info", &ftrace.long_info, "Show process names, PIDs, timestamps, irq-info if available"), OPT_UINTEGER(0, "tracing-thresh", &ftrace.tracing_thresh, -- 2.25.1
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