Messages in this thread Patch in this message | | | From | Changbin Du <> | Subject | [PATCH v3 12/17] perf ftrace: add support for trace option funcgraph-irqs | Date | Thu, 9 Jul 2020 00:46:00 +0800 |
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This adds an option '--graph-opts 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 | 1 + tools/perf/builtin-ftrace.c | 21 ++++++++++++++++++++- 2 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt index 2165a75f1da1..5cc1f83795f5 100644 --- a/tools/perf/Documentation/perf-ftrace.txt +++ b/tools/perf/Documentation/perf-ftrace.txt @@ -109,6 +109,7 @@ OPTIONS --graph-opts:: List of options allowed to set: nosleep-time - Measure on-CPU time only for function_graph tracer. + noirqs - Ignore functions that happen inside interrupt. SEE ALSO -------- diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index 57d04d0e1178..330dac9ffe3d 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -44,6 +44,7 @@ struct perf_ftrace { bool inherit; int func_stack_trace; int graph_nosleep_time; + int graph_noirqs; }; struct filter_entry { @@ -203,6 +204,7 @@ 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) @@ -395,6 +397,17 @@ 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; @@ -479,6 +492,11 @@ 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; @@ -669,6 +687,7 @@ static int parse_graph_tracer_opts(const struct option *opt, struct perf_ftrace *ftrace = (struct perf_ftrace *) opt->value; struct sublevel_option graph_tracer_opts[] = { { .name = "nosleep-time", .value_ptr = &ftrace->graph_nosleep_time }, + { .name = "noirqs", .value_ptr = &ftrace->graph_noirqs }, { .name = NULL, } }; @@ -725,7 +744,7 @@ int cmd_ftrace(int argc, const char **argv) OPT_INTEGER('D', "graph-depth", &ftrace.graph_depth, "Max depth for function graph tracer"), OPT_CALLBACK(0, "graph-opts", &ftrace, "options", - "graph tracer options, available options: nosleep-time", + "graph tracer options, available options: nosleep-time,noirqs", parse_graph_tracer_opts), OPT_UINTEGER('d', "delay", &ftrace.initial_delay, "ms to wait before starting tracing after program start"), -- 2.25.1
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