perf trace: Add duration filter

Example:

[acme@sandy linux]$ perf trace --duration 0.025 usleep 1
     2.221 ( 0.958 ms): 6724 execve(arg0: 140733557168278, arg1: 140733557178768, arg2: 16134304, arg3: 140733557167840, arg4: 7955998171588342573, arg5: 6723) = -2
     3.690 ( 1.443 ms): 6724 execve(arg0: 140733557168295, arg1: 140733557178768, arg2: 16134304, arg3: 140733557167840, arg4: 7955998171588342573, arg5: 6723) = 0
     3.979 ( 0.048 ms): 6724 open(filename: 208733843841, flags: 0, mode: 1                        ) = 3
     4.071 ( 0.075 ms): 6724 open(filename: 139744419925673, flags: 0, mode: 0                     ) = 3
     4.318 ( 0.056 ms): 6724 nanosleep(rqtp: 140734030404608, rmtp: 0                              ) = 0
[acme@sandy linux]$ perf trace --duration 0.100 usleep 1
     1.143 ( 1.021 ms): 6726 execve(arg0: 140736323962279, arg1: 140736323972752, arg2: 34926752, arg3: 140736323961824, arg4: 7955998171588342573, arg5: 6725) = 0
[acme@sandy linux]$

Cherry picked from tmp.perf/trace2 branch.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/n/tip-oslw2j2958we9qf0ctra4whd@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 31 insertions, 4 deletions

diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt
index 3a2ae37310a9..38d4b682af0b 100644
--- a/tools/perf/Documentation/perf-trace.txt
+++ b/tools/perf/Documentation/perf-trace.txt
@@ -48,6 +48,9 @@ comma-separated list with no space: 0,1. Ranges of CPUs are specified with -: 0-
 In per-thread mode with inheritance mode on (default), Events are captured only when
 the thread executes on the designated CPUs. Default is to monitor all CPUs.
 
+--duration:
+        Show only events that had a duration greater than N.M ms.
+
 SEE ALSO
 --------
 linkperf:perf-record[1], linkperf:perf-script[1]
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index ddb6e3721b1a..82ffa6c246d8 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -100,8 +100,14 @@ struct trace {
         struct machine          host;
         u64                     base_time;
         bool                    multiple_threads;
+        double                  duration_filter;
 };
 
+static bool trace__filter_duration(struct trace *trace, double t)
+{
+        return t < (trace->duration_filter * NSEC_PER_MSEC);
+}
+
 static size_t trace__fprintf_tstamp(struct trace *trace, u64 tstamp, FILE *fp)
 {
         double ts = (double)(tstamp - trace->base_time) / NSEC_PER_MSEC;
@@ -307,8 +313,10 @@ static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
         printed += syscall__scnprintf_args(sc, msg + printed, 1024 - printed,  args);
 
         if (!strcmp(sc->name, "exit_group") || !strcmp(sc->name, "exit")) {
-                trace__fprintf_entry_head(trace, thread, 1, sample->time, stdout);
-                printf("%-70s\n", ttrace->entry_str);
+                if (!trace->duration_filter) {
+                        trace__fprintf_entry_head(trace, thread, 1, sample->time, stdout);
+                        printf("%-70s\n", ttrace->entry_str);
+                }
         } else
                 ttrace->entry_pending = true;
 
@@ -333,8 +341,12 @@ static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
 
         ttrace->exit_time = sample->time;
 
-        if (ttrace->entry_time)
+        if (ttrace->entry_time) {
                 duration = sample->time - ttrace->entry_time;
+                if (trace__filter_duration(trace, duration))
+                        goto out;
+        } else if (trace->duration_filter)
+                goto out;
 
         trace__fprintf_entry_head(trace, thread, duration, sample->time, stdout);
 
@@ -358,7 +370,7 @@ static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
                 printf(") = %d", ret);
 
         putchar('\n');
-
+out:
         ttrace->entry_pending = false;
 
         return 0;
@@ -495,6 +507,15 @@ out:
         return err;
 }
 
+static int trace__set_duration(const struct option *opt, const char *str,
+                               int unset __maybe_unused)
+{
+        struct trace *trace = opt->value;
+
+        trace->duration_filter = atof(str);
+        return 0;
+}
+
 int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
 {
         const char * const trace_usage[] = {
@@ -533,6 +554,9 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
                      "number of mmap data pages"),
         OPT_STRING(0, "uid", &trace.opts.target.uid_str, "user",
                    "user to profile"),
+        OPT_CALLBACK(0, "duration", &trace, "float",
+                     "show only events with duration > N.M ms",
+                     trace__set_duration),
         OPT_END()
         };
         int err;