Messages in this thread Patch in this message | | | From | Changbin Du <> | Subject | [PATCH v2 11/15] perf ftrace: add support for trace option funcgraph-irqs | Date | Sat, 27 Jun 2020 21:36:50 +0800 |
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This adds an option '--graph-noirqs' to filter out functions executed in irq context.
Signed-off-by: Changbin Du <changbin.du@gmail.com>
--- v2: option name '--nofuncgraph-irqs' -> '--graph-noirqs'. --- tools/perf/Documentation/perf-ftrace.txt | 3 +++ tools/perf/builtin-ftrace.c | 20 ++++++++++++++++++++ 2 files changed, 23 insertions(+)
diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt index a3000436f80b..b616e05d5156 100644 --- a/tools/perf/Documentation/perf-ftrace.txt +++ b/tools/perf/Documentation/perf-ftrace.txt @@ -107,6 +107,9 @@ OPTIONS --graph-nosleep-time:: Measure on-CPU time only for function_graph tracer. +--graph-noirqs:: + Ignore functions that happen inside interrupt for function_graph tracer. + SEE ALSO -------- linkperf:perf-record[1], linkperf:perf-trace[1] diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index eba125a60820..876c8e800425 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -43,6 +43,7 @@ struct perf_ftrace { bool inherit; bool func_stack_trace; bool graph_nosleep_time; + bool graph_noirqs; }; struct filter_entry { @@ -202,6 +203,7 @@ static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused) write_tracing_option_file("function-fork", "0"); write_tracing_option_file("func_stack_trace", "0"); write_tracing_option_file("sleep-time", "1"); + write_tracing_option_file("funcgraph-irqs", "1"); } static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused) @@ -393,6 +395,17 @@ static int set_tracing_sleep_time(struct perf_ftrace *ftrace) return 0; } +static int set_tracing_funcgraph_irqs(struct perf_ftrace *ftrace) +{ + if (!ftrace->graph_noirqs) + return 0; + + if (write_tracing_option_file("funcgraph-irqs", "0") < 0) + return -1; + + return 0; +} + static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) { char *trace_file; @@ -477,6 +490,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) goto out_reset; } + if (set_tracing_funcgraph_irqs(ftrace) < 0) { + pr_err("failed to set tracing option funcgraph-irqs\n"); + goto out_reset; + } + if (write_tracing_file("current_tracer", ftrace->tracer) < 0) { pr_err("failed to set current_tracer to %s\n", ftrace->tracer); goto out_reset; @@ -658,6 +676,8 @@ int cmd_ftrace(int argc, const char **argv) "trace children processes"), OPT_BOOLEAN(0, "graph-nosleep-time", &ftrace.graph_nosleep_time, "measure on-CPU time only for function_graph tracer"), + OPT_BOOLEAN(0, "graph-noirqs", &ftrace.graph_noirqs, + "ignore functions that happen inside interrupt for function_graph tracer"), OPT_END() }; -- 2.25.1
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