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SubjectRe: [PATCH 07/19] perf ftrace: add support for trace option funcgraph-irqs
Em Sun, May 10, 2020 at 11:06:16PM +0800, Changbin Du escreveu:
> This adds an option '--nofuncgraph-irqs' to filter out functions executed
> in irq context.

Ditto

> 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 d3fcf3b0b792..b16600a16efa 100644
> --- a/tools/perf/builtin-ftrace.c
> +++ b/tools/perf/builtin-ftrace.c
> @@ -41,6 +41,7 @@ struct perf_ftrace {
> int graph_depth;
> bool func_stack_trace;
> bool nosleep_time;
> + bool nofuncgraph_irqs;
> };
>
> struct filter_entry {
> @@ -188,6 +189,7 @@ static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused)
> {
> 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)
> @@ -358,6 +360,17 @@ static int set_tracing_sleep_time(struct perf_ftrace *ftrace)
> return 0;
> }
>
> +static int set_tracing_funcgraph_irqs(struct perf_ftrace *ftrace)
> +{
> + if (!ftrace->nofuncgraph_irqs)
> + 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;
> @@ -431,6 +444,11 @@ 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;
> @@ -568,6 +586,8 @@ int cmd_ftrace(int argc, const char **argv)
> "Max depth for function graph tracer"),
> OPT_BOOLEAN(0, "nosleep-time", &ftrace.nosleep_time,
> "Measure on-CPU time only (function_graph only)"),
> + OPT_BOOLEAN(0, "nofuncgraph-irqs", &ftrace.nofuncgraph_irqs,
> + "Ignore functions that happen inside interrupt (function_graph only)"),
> OPT_END()
> };
>
> --
> 2.25.1
>

--

- Arnaldo

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