diff options
| author | Changbin Du <changbin.du@gmail.com> | 2020-08-08 10:31:33 +0800 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-08-14 09:26:56 -0300 |
| commit | d1bcf17cda8001e2826d409019866b33adb82219 (patch) | |
| tree | fd48bfb6ad43e1ad2c53251bf62d1474dcf93066 /tools | |
| parent | 38988f2e7ed515784b8b19e2be265c9c6984ce6f (diff) | |
| download | linux-rt-d1bcf17cda8001e2826d409019866b33adb82219.tar.gz | |
perf ftrace: Add support for trace option funcgraph-irqs
This adds an option '--graph-opts noirqs' to filter out functions executed
in irq context.
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: http://lore.kernel.org/lkml/20200808023141.14227-11-changbin.du@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/Documentation/perf-ftrace.txt | 1 | ||||
| -rw-r--r-- | tools/perf/builtin-ftrace.c | 21 |
2 files changed, 21 insertions, 1 deletions
diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt index 3380a2e2c9ad..fca55ac55ff3 100644 --- a/tools/perf/Documentation/perf-ftrace.txt +++ b/tools/perf/Documentation/perf-ftrace.txt @@ -104,6 +104,7 @@ 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 47d63bba6a48..b4c821be4fb5 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -45,6 +45,7 @@ struct perf_ftrace { bool inherit; int func_stack_trace; int graph_nosleep_time; + int graph_noirqs; }; struct filter_entry { @@ -207,6 +208,7 @@ 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) @@ -399,6 +401,17 @@ 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; @@ -483,6 +496,11 @@ 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; @@ -662,6 +680,7 @@ 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, } }; @@ -733,7 +752,7 @@ 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_CALLBACK('m', "buffer-size", &ftrace.percpu_buffer_size, "size", "size of per cpu buffer", parse_buffer_size), |