Messages in this thread Patch in this message | | | From | changbin.du@intel ... | Subject | [PATCH] perf ftrace: Add -O option to set trace option | Date | Fri, 15 Sep 2017 19:19:31 +0800 |
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From: Changbin Du <changbin.du@intel.com>
There are some trace options to control what gets printed in the trace output or manipulate the tracers. This patch add a commandline option to set it.
Example: perf ftrace -t function -O noprint-parent --trace-funcs "__kmalloc" -a Xorg-1874 [002] .... 4107.182911: __kmalloc Xorg-1874 [002] .... 4107.182920: __kmalloc
perf ftrace -t function -O print-parent --trace-funcs "__kmalloc" -a Xorg-1874 [000] .... 3924.917243: __kmalloc <-drm_atomic_state_init Xorg-1874 [000] .... 3924.917251: __kmalloc <-drm_atomic_state_init
Signed-off-by: Changbin Du <changbin.du@intel.com> --- tools/perf/builtin-ftrace.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index 25a42ac..8b473e2 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -36,6 +36,7 @@ struct perf_ftrace { struct list_head graph_funcs; struct list_head nograph_funcs; int graph_depth; + const char *trace_option; }; struct filter_entry { @@ -261,6 +262,17 @@ static int set_tracing_depth(struct perf_ftrace *ftrace) return 0; } +static int set_tracing_option(struct perf_ftrace *ftrace) +{ + if (ftrace->trace_option == NULL) + return 0; + + if (write_tracing_file("trace_options", ftrace->trace_option) < 0) + return -1; + + return 0; +} + static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) { char *trace_file; @@ -313,6 +325,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) goto out_reset; } + if (set_tracing_option(ftrace) < 0) { + pr_err("failed to set trace option\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; @@ -456,6 +473,8 @@ int cmd_ftrace(int argc, const char **argv) "Set nograph filter on given functions", parse_filter_func), OPT_INTEGER('D', "graph-depth", &ftrace.graph_depth, "Max depth for function graph tracer"), + OPT_STRING('O', "trace-option", &ftrace.trace_option, "option", + "Set a trace option"), OPT_END() }; -- 2.7.4
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