lkml.org 
[lkml]   [2020]   [May]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 09/19] perf ftrace: add support for trace option tracing_thresh
    Date
    This adds an option '--tracing-thresh' to setup trace duration threshold
    for funcgraph tracer.

    Signed-off-by: Changbin Du <changbin.du@gmail.com>
    ---
    tools/perf/builtin-ftrace.c | 26 ++++++++++++++++++++++++++
    1 file changed, 26 insertions(+)

    diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
    index f11f2d3431b0..20bc14d6c5fb 100644
    --- a/tools/perf/builtin-ftrace.c
    +++ b/tools/perf/builtin-ftrace.c
    @@ -43,6 +43,7 @@ struct perf_ftrace {
    bool nosleep_time;
    bool nofuncgraph_irqs;
    bool long_info;
    + unsigned tracing_thresh;
    };

    struct filter_entry {
    @@ -213,6 +214,9 @@ static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
    if (write_tracing_file("max_graph_depth", "0") < 0)
    return -1;

    + if (write_tracing_file("tracing_thresh", "0") < 0)
    + return -1;
    +
    reset_tracing_filters();
    reset_tracing_options(ftrace);
    return 0;
    @@ -392,6 +396,21 @@ static int set_tracing_long_info(struct perf_ftrace *ftrace)
    return 0;
    }

    +static int set_tracing_thresh(struct perf_ftrace *ftrace)
    +{
    + char buf[16];
    +
    + if (ftrace->tracing_thresh == 0)
    + return 0;
    +
    + snprintf(buf, sizeof(buf), "%d", ftrace->tracing_thresh);
    +
    + if (write_tracing_file("tracing_thresh", buf) < 0)
    + return -1;
    +
    + return 0;
    +}
    +
    static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
    {
    char *trace_file;
    @@ -475,6 +494,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
    goto out_reset;
    }

    + if (set_tracing_thresh(ftrace) < 0) {
    + pr_err("failed to set tracing thresh\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;
    @@ -616,6 +640,8 @@ int cmd_ftrace(int argc, const char **argv)
    "Ignore functions that happen inside interrupt (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,
    + "Only show functions of which the duration is greater than <n>µs"),
    OPT_END()
    };

    --
    2.25.1
    \
     
     \ /
      Last update: 2020-05-10 17:09    [W:3.371 / U:0.056 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site