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| author | Changbin Du <changbin.du@gmail.com> | 2020-08-08 04:31:36 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-08-14 14:29:35 +0200 |
| commit | 00c85d5f45b6b366f68c876cd89b8b790f50ea0f (patch) | |
| tree | 3a897f8c0a95bec9d7c8c0a46af68641c625949f /tools/perf | |
| parent | perf ftrace: Add option 'verbose' to show more info for graph tracer (diff) | |
| download | linux-00c85d5f45b6b366f68c876cd89b8b790f50ea0f.tar.xz linux-00c85d5f45b6b366f68c876cd89b8b790f50ea0f.zip | |
perf ftrace: Add support for trace option tracing_thresh
This adds an option '--graph-opts thresh' to setup trace duration
threshold for funcgraph tracer.
$ sudo ./perf ftrace -G '*' --graph-opts thresh=100
3) ! 184.060 us | } /* schedule */
3) ! 185.600 us | } /* exit_to_usermode_loop */
2) ! 225.989 us | } /* schedule_idle */
2) # 4140.051 us | } /* do_idle */
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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/20200808023141.14227-14-changbin.du@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/Documentation/perf-ftrace.txt | 1 | ||||
| -rw-r--r-- | tools/perf/builtin-ftrace.c | 26 |
2 files changed, 26 insertions, 1 deletions
diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt index a2056aaf2ece..6fa927e5971b 100644 --- a/tools/perf/Documentation/perf-ftrace.txt +++ b/tools/perf/Documentation/perf-ftrace.txt @@ -107,6 +107,7 @@ OPTIONS nosleep-time - Measure on-CPU time only for function_graph tracer. noirqs - Ignore functions that happen inside interrupt. verbose - Show process names, PIDs, timestamps, etc. + thresh=<n> - Setup trace duration threshold in microseconds. SEE ALSO -------- diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index 8ee5287bd84a..ca61f8b8bbf6 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -48,6 +48,7 @@ struct perf_ftrace { int graph_nosleep_time; int graph_noirqs; int graph_verbose; + int graph_thresh; }; struct filter_entry { @@ -234,6 +235,9 @@ 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; @@ -446,6 +450,20 @@ static int set_tracing_funcgraph_verbose(struct perf_ftrace *ftrace) return 0; } +static int set_tracing_thresh(struct perf_ftrace *ftrace) +{ + int ret; + + if (ftrace->graph_thresh == 0) + return 0; + + ret = write_tracing_file_int("tracing_thresh", ftrace->graph_thresh); + if (ret < 0) + return ret; + + return 0; +} + static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) { char *trace_file; @@ -545,6 +563,11 @@ 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; @@ -727,6 +750,7 @@ static int parse_graph_tracer_opts(const struct option *opt, { .name = "nosleep-time", .value_ptr = &ftrace->graph_nosleep_time }, { .name = "noirqs", .value_ptr = &ftrace->graph_noirqs }, { .name = "verbose", .value_ptr = &ftrace->graph_verbose }, + { .name = "thresh", .value_ptr = &ftrace->graph_thresh }, { .name = NULL, } }; @@ -798,7 +822,7 @@ 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,noirqs,verbose", + "graph tracer options, available options: nosleep-time,noirqs,verbose,thresh=<n>", parse_graph_tracer_opts), OPT_CALLBACK('m', "buffer-size", &ftrace.percpu_buffer_size, "size", "size of per cpu buffer", parse_buffer_size), |