On Fri, Aug 14, 2020 at 09:33:10AM -0300, Arnaldo Carvalho de Melo wrote: > Em Sat, Aug 08, 2020 at 10:31:36AM +0800, Changbin Du escreveu: > > This adds an option '--graph-opts thresh' to setup trace duration > > threshold for funcgraph tracer. > > Applied, please consider making --duration an alias for this, as this is > also available in 'perf trace': > > [root@quaco ~]# perf trace --duration 500 --max-events=5 > 369.860 gnome-shell/2084 poll(ufds: 0x559577983080, nfds: 21, > timeout_msecs: 7194) = 1 > 493.654 pool-geoclue/386046 futex(uaddr: 0x56024843b610, op: > WAIT|PRIVATE_FLAG, val: 1201, utime: 0x7f32bd7f9cc0) = -1 ETIMEDOUT > (Connection timed out) > 71.604 WebRTC_Worker/111634 futex(uaddr: 0x7fb4c364d608, op: > WAIT_BITSET|PRIVATE_FLAG, val: 0, utime: 0x7fb4c364d410, val3: MATCH_ANY) = > -1 ETIMEDOUT (Connection timed out) > 601.645 pool-gsd-smart/2469 clock_nanosleep(which_clock: 0, flags: 0, > rqtp: 0x7fb82cbd1cf0, rmtp: 0x7fb82cbd1d00) = 0 > 623.823 chromium-brows/92363 futex(uaddr: 0x7ffcfd064e38, op: > WAIT_BITSET|PRIVATE_FLAG, val: 0, utime: 0x7ffcfd064c40, val3: MATCH_ANY) = > -1 ETIMEDOUT (Connection timed out) > [root@quaco ~]# > > $ perf trace -h duration > > --duration <float> > show only events with duration > N.M ms > > $ > > This way one would be able to do: > > # perf trace --duration N.M > > To see at syscall level, then add 'f': > > # perf ftrace --duration N.M > > To see at kernel function level. Switching from one perf tool to another > with such ease is the main objective here, I'd say :-) > Sure. Currently the unit for ftrace is 'ns'. I could change it to 'ms' at perf level.
> - Arnaldo > > > $ 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...@gmail.com> > > --- > > tools/perf/Documentation/perf-ftrace.txt | 1 + > > tools/perf/builtin-ftrace.c | 26 +++++++++++++++++++++++- > > 2 files changed, 26 insertions(+), 1 deletion(-) > > > > 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), > > -- > > 2.25.1 > > > > -- > > - Arnaldo -- Cheers, Changbin Du