perf trace: Add summary option to dump syscall statistics

When enabled dumps a summary of all syscalls by task with the usual
statistics -- min, max, average and relative stddev. For example,

make - 26341 :       3344   [ 17.4% ]      0.000 ms

                read :   52    0.000     4.802     0.644   30.08
               write :   20    0.004     0.036     0.010   21.72
                open :   24    0.003     0.046     0.014   23.68
               close :   64    0.002     0.055     0.008   22.53
                stat : 2714    0.002     0.222     0.004    4.47
               fstat :   18    0.001     0.041     0.006   46.26
                mmap :   30    0.003     0.009     0.006    5.71
            mprotect :    8    0.006     0.039     0.016   32.16
              munmap :   12    0.007     0.077     0.020   38.25
                 brk :   48    0.002     0.014     0.004   10.18
        rt_sigaction :   18    0.002     0.002     0.002    2.11
      rt_sigprocmask :   60    0.002     0.128     0.010   32.88
              access :    2    0.006     0.006     0.006    0.00
                pipe :   12    0.004     0.048     0.013   35.98
               vfork :   34    0.448     0.980     0.692    3.04
              execve :   20    0.000     0.387     0.046   56.66
               wait4 :   34    0.017  9923.287   593.221   68.45
               fcntl :    8    0.001     0.041     0.013   48.79
            getdents :   48    0.002     0.079     0.013   19.62
              getcwd :    2    0.005     0.005     0.005    0.00
               chdir :    2    0.070     0.070     0.070    0.00
           getrlimit :    2    0.045     0.045     0.045    0.00
          arch_prctl :    2    0.002     0.002     0.002    0.00
           setrlimit :    2    0.002     0.002     0.002    0.00
              openat :   94    0.003     0.005     0.003    2.11

Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1381289214-24885-3-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 98 insertions, 12 deletions

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 5496546b7c5c..d0f91fe755a3 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -10,6 +10,7 @@
 #include "util/strlist.h"
 #include "util/intlist.h"
 #include "util/thread_map.h"
+#include "util/stat.h"
 
 #include <libaudit.h>
 #include <stdlib.h>
@@ -909,6 +910,8 @@ struct thread_trace {
                 int       max;
                 char      **table;
         } paths;
+
+        struct intlist *syscall_stats;
 };
 
 static struct thread_trace *thread_trace__new(void)
@@ -918,6 +921,8 @@ static struct thread_trace *thread_trace__new(void)
         if (ttrace)
                 ttrace->paths.max = -1;
 
+        ttrace->syscall_stats = intlist__new(NULL);
+
         return ttrace;
 }
 
@@ -964,6 +969,7 @@ struct trace {
         struct intlist          *pid_list;
         bool                    sched;
         bool                    multiple_threads;
+        bool                    summary;
         bool                    show_comm;
         double                  duration_filter;
         double                  runtime_ms;
@@ -1291,10 +1297,8 @@ typedef int (*tracepoint_handler)(struct trace *trace, struct perf_evsel *evsel,
                                   struct perf_sample *sample);
 
 static struct syscall *trace__syscall_info(struct trace *trace,
-                                           struct perf_evsel *evsel,
-                                           struct perf_sample *sample)
+                                           struct perf_evsel *evsel, int id)
 {
-        int id = perf_evsel__intval(evsel, sample, "id");
 
         if (id < 0) {
 
@@ -1335,6 +1339,32 @@ out_cant_read:
         return NULL;
 }
 
+static void thread__update_stats(struct thread_trace *ttrace,
+                                 int id, struct perf_sample *sample)
+{
+        struct int_node *inode;
+        struct stats *stats;
+        u64 duration = 0;
+
+        inode = intlist__findnew(ttrace->syscall_stats, id);
+        if (inode == NULL)
+                return;
+
+        stats = inode->priv;
+        if (stats == NULL) {
+                stats = malloc(sizeof(struct stats));
+                if (stats == NULL)
+                        return;
+                init_stats(stats);
+                inode->priv = stats;
+        }
+
+        if (ttrace->entry_time && sample->time > ttrace->entry_time)
+                duration = sample->time - ttrace->entry_time;
+
+        update_stats(stats, duration);
+}
+
 static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
                             struct perf_sample *sample)
 {
@@ -1342,7 +1372,8 @@ static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
         void *args;
         size_t printed = 0;
         struct thread *thread;
-        struct syscall *sc = trace__syscall_info(trace, evsel, sample);
+        int id = perf_evsel__intval(evsel, sample, "id");
+        struct syscall *sc = trace__syscall_info(trace, evsel, id);
         struct thread_trace *ttrace;
 
         if (sc == NULL)
@@ -1394,7 +1425,8 @@ static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
         int ret;
         u64 duration = 0;
         struct thread *thread;
-        struct syscall *sc = trace__syscall_info(trace, evsel, sample);
+        int id = perf_evsel__intval(evsel, sample, "id");
+        struct syscall *sc = trace__syscall_info(trace, evsel, id);
         struct thread_trace *ttrace;
 
         if (sc == NULL)
@@ -1408,6 +1440,9 @@ static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
         if (ttrace == NULL)
                 return -1;
 
+        if (trace->summary)
+                thread__update_stats(ttrace, id, sample);
+
         ret = perf_evsel__intval(evsel, sample, "ret");
 
         ttrace = thread->priv;
@@ -1574,6 +1609,8 @@ static int trace__record(int argc, const char **argv)
         return cmd_record(i, rec_argv, NULL);
 }
 
+static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp);
+
 static int trace__run(struct trace *trace, int argc, const char **argv)
 {
         struct perf_evlist *evlist = perf_evlist__new();
@@ -1703,6 +1740,9 @@ again:
         goto again;
 
 out_unmap_evlist:
+        if (!err && trace->summary)
+                trace__fprintf_thread_summary(trace, trace->output);
+
         perf_evlist__munmap(evlist);
 out_close_evlist:
         perf_evlist__close(evlist);
@@ -1798,6 +1838,9 @@ static int trace__replay(struct trace *trace)
         if (err)
                 pr_err("Failed to process events, error %d", err);
 
+        else if (trace->summary)
+                trace__fprintf_thread_summary(trace, trace->output);
+
 out:
         perf_session__delete(session);
 
@@ -1808,10 +1851,53 @@ static size_t trace__fprintf_threads_header(FILE *fp)
 {
         size_t printed;
 
-        printed  = fprintf(fp, "\n _____________________________________________________________________\n");
-        printed += fprintf(fp," __)    Summary of events    (__\n\n");
-        printed += fprintf(fp,"              [ task - pid ]     [ events ] [ ratio ]  [ runtime ]\n");
-        printed += fprintf(fp," _____________________________________________________________________\n\n");
+        printed  = fprintf(fp, "\n _____________________________________________________________________________\n");
+        printed += fprintf(fp, " __)    Summary of events    (__\n\n");
+        printed += fprintf(fp, "              [ task - pid ]     [ events ] [ ratio ]  [ runtime ]\n");
+        printed += fprintf(fp, "                                  syscall  count    min     max    avg  stddev\n");
+        printed += fprintf(fp, "                                                   msec    msec   msec     %%\n");
+        printed += fprintf(fp, " _____________________________________________________________________________\n\n");
+
+        return printed;
+}
+
+static size_t thread__dump_stats(struct thread_trace *ttrace,
+                                 struct trace *trace, FILE *fp)
+{
+        struct stats *stats;
+        size_t printed = 0;
+        struct syscall *sc;
+        struct int_node *inode = intlist__first(ttrace->syscall_stats);
+
+        if (inode == NULL)
+                return 0;
+
+        printed += fprintf(fp, "\n");
+
+        /* each int_node is a syscall */
+        while (inode) {
+                stats = inode->priv;
+                if (stats) {
+                        double min = (double)(stats->min) / NSEC_PER_MSEC;
+                        double max = (double)(stats->max) / NSEC_PER_MSEC;
+                        double avg = avg_stats(stats);
+                        double pct;
+                        u64 n = (u64) stats->n;
+
+                        pct = avg ? 100.0 * stddev_stats(stats)/avg : 0.0;
+                        avg /= NSEC_PER_MSEC;
+
+                        sc = &trace->syscalls.table[inode->i];
+                        printed += fprintf(fp, "%24s  %14s : ", "", sc->name);
+                        printed += fprintf(fp, "%5" PRIu64 "  %8.3f  %8.3f",
+                                           n, min, max);
+                        printed += fprintf(fp, "  %8.3f  %6.2f\n", avg, pct);
+                }
+
+                inode = intlist__next(inode);
+        }
+
+        printed += fprintf(fp, "\n\n");
 
         return printed;
 }
@@ -1850,6 +1936,7 @@ static int trace__fprintf_one_thread(struct thread *thread, void *priv)
         printed += fprintf(fp, " - %-5d :%11lu   [", thread->tid, ttrace->nr_events);
         printed += color_fprintf(fp, color, "%5.1f%%", ratio);
         printed += fprintf(fp, " ] %10.3f ms\n", ttrace->runtime_ms);
+        printed += thread__dump_stats(ttrace, trace, fp);
 
         data->printed += printed;
 
@@ -1953,6 +2040,8 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
         OPT_INCR('v', "verbose", &verbose, "be more verbose"),
         OPT_BOOLEAN('T', "time", &trace.full_time,
                     "Show full timestamp, not time relative to first start"),
+        OPT_BOOLEAN(0, "summary", &trace.summary,
+                    "Show syscall summary with statistics"),
         OPT_END()
         };
         int err;
@@ -2008,9 +2097,6 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
         else
                 err = trace__run(&trace, argc, argv);
 
-        if (trace.sched && !err)
-                trace__fprintf_thread_summary(&trace, trace.output);
-
 out_close:
         if (output_name != NULL)
                 fclose(trace.output);