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    Subject[PATCH v2 11/15] perf ftrace: add support for trace option funcgraph-irqs
    Date
    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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