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Message-Id: <1245675657.7537.3.camel@localhost.localdomain>
Date: Mon, 22 Jun 2009 18:30:57 +0530
From: Jaswinder Singh Rajput <jaswinder@...nel.org>
To: Ingo Molnar <mingo@...e.hu>
Cc: Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2 -tip] perf_counter: parse-events.c introduce alias
member in event_symbol
On Mon, 2009-06-22 at 13:32 +0200, Ingo Molnar wrote:
> Another nice thing would be for 'perf list' to actually start each
> counter and stop it - and see whether it ticks. Perhaps that could
> be a new sub-command: 'perf test' ?
>
> New 'perf' subcommands are added easily:
>
> create a new tools/perf/builtin-foo.c file, add it to
> command-list.txt and to the Makefile - add it to perf.c's array of
> built-in commands and add a Documentation/perf-foo.txt file to
> generate manpages and usage strings for it.
>
Ok this is just a ugly quick hack to get the idea what actually you are
looking for :
[RFC] perf_counter tools: introduce perf test to test each event for ticks
perf test to Test all events for whether it ticks
$ perf test
Performance counter stats for 'test':
task-clock-msecs Tick
context-switches Tick
CPU-migrations Tick
page-faults Tick
cycles Tick
instructions Tick
cache-references Tick
cache-misses Tick
0.007693869 seconds time elapsed.
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
---
tools/perf/Documentation/perf-test.txt | 24 ++
tools/perf/Makefile | 1 +
tools/perf/builtin-test.c | 399 ++++++++++++++++++++++++++++++++
tools/perf/builtin.h | 1 +
tools/perf/command-list.txt | 1 +
tools/perf/perf.c | 1 +
6 files changed, 427 insertions(+), 0 deletions(-)
create mode 100644 tools/perf/Documentation/perf-test.txt
create mode 100644 tools/perf/builtin-test.c
diff --git a/tools/perf/Documentation/perf-test.txt b/tools/perf/Documentation/perf-test.txt
new file mode 100644
index 0000000..44cf495
--- /dev/null
+++ b/tools/perf/Documentation/perf-test.txt
@@ -0,0 +1,24 @@
+perf-test(1)
+============
+
+NAME
+----
+perf-test - Test all events for whether it ticks
+
+SYNOPSIS
+--------
+[verse]
+'perf test'
+
+DESCRIPTION
+-----------
+This command test all events whether it ticks.
+
+OPTIONS
+-------
+None
+
+SEE ALSO
+--------
+linkperf:perf-stat[1], linkperf:perf-top[1],
+linkperf:perf-record[1]
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 36d7eef..f5ac83f 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -335,6 +335,7 @@ BUILTIN_OBJS += builtin-list.o
BUILTIN_OBJS += builtin-record.o
BUILTIN_OBJS += builtin-report.o
BUILTIN_OBJS += builtin-stat.o
+BUILTIN_OBJS += builtin-test.o
BUILTIN_OBJS += builtin-top.o
PERFLIBS = $(LIB_FILE)
diff --git a/tools/perf/builtin-test.c b/tools/perf/builtin-test.c
new file mode 100644
index 0000000..0b8b25a
--- /dev/null
+++ b/tools/perf/builtin-test.c
@@ -0,0 +1,399 @@
+/*
+ * builtin-test.c
+ *
+ * Builtin test command: Tests each event and see whether it ticks
+ *
+ * Sample output:
+
+ $ perf test
+
+ Performance counter stats for 'test':
+
+ task-clock-msecs Tick
+ context-switches Tick
+ CPU-migrations Tick
+ page-faults Tick
+ cycles Tick
+ instructions Tick
+ cache-references Tick
+ cache-misses Tick
+
+ 0.007693869 seconds time elapsed.
+
+ * (based on builtin-stat.c)
+ *
+ * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@...hat.com>
+ * Copyright (C) 2009, Jaswinder Singh Rajput <jaswinder@...nel.org>
+ *
+ * Released under the GPL v2. (and only v2, not any later version)
+ */
+
+#include "perf.h"
+#include "builtin.h"
+#include "util/util.h"
+#include "util/parse-options.h"
+#include "util/parse-events.h"
+
+#include <sys/prctl.h>
+#include <math.h>
+
+static struct perf_counter_attr default_attrs[MAX_COUNTERS] = {
+
+ { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK },
+ { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES},
+ { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS },
+ { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS },
+
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES },
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS },
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES},
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES },
+
+};
+
+static int system_wide = 0;
+static int inherit = 1;
+static int verbose = 0;
+
+static int fd[MAX_NR_CPUS][MAX_COUNTERS];
+
+static int nr_cpus = 0;
+static unsigned int page_size;
+
+static int scale = 1;
+
+#define MAX_RUN 100
+
+static int run_count = 1;
+static int run_idx = 0;
+
+static u64 event_res[MAX_RUN][MAX_COUNTERS][3];
+static u64 event_scaled[MAX_RUN][MAX_COUNTERS];
+
+static u64 runtime_nsecs[MAX_RUN];
+static u64 walltime_nsecs[MAX_RUN];
+static u64 runtime_cycles[MAX_RUN];
+
+static u64 event_res_avg[MAX_COUNTERS][3];
+static u64 event_res_noise[MAX_COUNTERS][3];
+
+static u64 event_scaled_avg[MAX_COUNTERS];
+
+static u64 runtime_nsecs_avg;
+static u64 runtime_nsecs_noise;
+
+static u64 walltime_nsecs_avg;
+static u64 walltime_nsecs_noise;
+
+static u64 runtime_cycles_avg;
+static u64 runtime_cycles_noise;
+
+static void create_perf_stat_counter(int counter)
+{
+ struct perf_counter_attr *attr = attrs + counter;
+
+ if (scale)
+ attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
+ PERF_FORMAT_TOTAL_TIME_RUNNING;
+
+ if (system_wide) {
+ int cpu;
+ for (cpu = 0; cpu < nr_cpus; cpu ++) {
+ fd[cpu][counter] = sys_perf_counter_open(attr, -1, cpu, -1, 0);
+ if (fd[cpu][counter] < 0 && verbose) {
+ printf("Error: counter %d, sys_perf_counter_open() syscall returned with %d (%s)\n", counter, fd[cpu][counter], strerror(errno));
+ }
+ }
+ } else {
+ attr->inherit = inherit;
+ attr->disabled = 1;
+
+ fd[0][counter] = sys_perf_counter_open(attr, 0, -1, -1, 0);
+ if (fd[0][counter] < 0 && verbose) {
+ printf("Error: counter %d, sys_perf_counter_open() syscall returned with %d (%s)\n", counter, fd[0][counter], strerror(errno));
+ }
+ }
+}
+
+/*
+ * Does the counter have nsecs as a unit?
+ */
+static inline int nsec_counter(int counter)
+{
+ if (attrs[counter].type != PERF_TYPE_SOFTWARE)
+ return 0;
+
+ if (attrs[counter].config == PERF_COUNT_SW_CPU_CLOCK)
+ return 1;
+
+ if (attrs[counter].config == PERF_COUNT_SW_TASK_CLOCK)
+ return 1;
+
+ return 0;
+}
+
+/*
+ * Read out the results of a single counter:
+ */
+static void read_counter(int counter)
+{
+ u64 *count, single_count[3];
+ ssize_t res;
+ int cpu, nv;
+ int scaled;
+
+ count = event_res[run_idx][counter];
+
+ count[0] = count[1] = count[2] = 0;
+
+ nv = scale ? 3 : 1;
+ for (cpu = 0; cpu < nr_cpus; cpu ++) {
+ if (fd[cpu][counter] < 0)
+ continue;
+
+ res = read(fd[cpu][counter], single_count, nv * sizeof(u64));
+ assert(res == nv * sizeof(u64));
+ close(fd[cpu][counter]);
+ fd[cpu][counter] = -1;
+
+ count[0] += single_count[0];
+ if (scale) {
+ count[1] += single_count[1];
+ count[2] += single_count[2];
+ }
+ }
+
+ scaled = 0;
+ if (scale) {
+ if (count[2] == 0) {
+ event_scaled[run_idx][counter] = -1;
+ count[0] = 0;
+ return;
+ }
+
+ if (count[2] < count[1]) {
+ event_scaled[run_idx][counter] = 1;
+ count[0] = (unsigned long long)
+ ((double)count[0] * count[1] / count[2] + 0.5);
+ }
+ }
+ /*
+ * Save the full runtime - to allow normalization during printout:
+ */
+ if (attrs[counter].type == PERF_TYPE_SOFTWARE &&
+ attrs[counter].config == PERF_COUNT_SW_TASK_CLOCK)
+ runtime_nsecs[run_idx] = count[0];
+ if (attrs[counter].type == PERF_TYPE_HARDWARE &&
+ attrs[counter].config == PERF_COUNT_HW_CPU_CYCLES)
+ runtime_cycles[run_idx] = count[0];
+}
+
+static int run_perf_stat(int argc, const char **argv)
+{
+ unsigned long long t0, t1;
+ int status = 0;
+ int counter;
+ int pid;
+
+ if (!system_wide)
+ nr_cpus = 1;
+
+ for (counter = 0; counter < nr_counters; counter++)
+ create_perf_stat_counter(counter);
+
+ /*
+ * Enable counters and exec the command:
+ */
+ t0 = rdclock();
+ prctl(PR_TASK_PERF_COUNTERS_ENABLE);
+
+ if ((pid = fork()) < 0)
+ perror("failed to fork");
+
+ if (!pid) {
+ if (execvp(argv[0], (char **)argv)) {
+ perror(argv[0]);
+ exit(-1);
+ }
+ }
+
+ wait(&status);
+
+ prctl(PR_TASK_PERF_COUNTERS_DISABLE);
+ t1 = rdclock();
+
+ walltime_nsecs[run_idx] = t1 - t0;
+
+ for (counter = 0; counter < nr_counters; counter++)
+ read_counter(counter);
+
+ return WEXITSTATUS(status);
+}
+
+static void test_printout(int counter, u64 *count)
+{
+ fprintf(stderr, " %-20s", event_name(counter));
+
+ if (count[0])
+ fprintf(stderr, " Tick");
+ else
+ fprintf(stderr, " No Tick");
+}
+
+/*
+ * Print out the results of a single counter:
+ */
+static void print_counter(int counter)
+{
+ u64 *count;
+
+ count = event_res_avg[counter];
+
+ test_printout(counter, count);
+
+ fprintf(stderr, "\n");
+}
+
+static void update_avg(const char *name, int idx, u64 *avg, u64 *val)
+{
+ *avg += *val;
+
+ if (verbose > 1)
+ fprintf(stderr, "debug: %20s[%d]: %Ld\n", name, idx, *val);
+}
+/*
+ * Calculate the averages and noises:
+ */
+static void calc_avg(void)
+{
+ int i, j;
+
+ if (verbose > 1)
+ fprintf(stderr, "\n");
+
+ for (i = 0; i < run_count; i++) {
+ update_avg("runtime", 0, &runtime_nsecs_avg, runtime_nsecs + i);
+ update_avg("walltime", 0, &walltime_nsecs_avg, walltime_nsecs + i);
+ update_avg("runtime_cycles", 0, &runtime_cycles_avg, runtime_cycles + i);
+ for (j = 0; j < nr_counters; j++) {
+ update_avg("counter/0", j,
+ event_res_avg[j]+0, event_res[i][j]+0);
+ update_avg("counter/1", j,
+ event_res_avg[j]+1, event_res[i][j]+1);
+ update_avg("counter/2", j,
+ event_res_avg[j]+2, event_res[i][j]+2);
+ update_avg("scaled", j,
+ event_scaled_avg + j, event_scaled[i]+j);
+ }
+ }
+ runtime_nsecs_avg /= run_count;
+ walltime_nsecs_avg /= run_count;
+ runtime_cycles_avg /= run_count;
+
+ for (j = 0; j < nr_counters; j++) {
+ event_res_avg[j][0] /= run_count;
+ event_res_avg[j][1] /= run_count;
+ event_res_avg[j][2] /= run_count;
+ }
+
+ for (i = 0; i < run_count; i++) {
+ runtime_nsecs_noise +=
+ abs((s64)(runtime_nsecs[i] - runtime_nsecs_avg));
+ walltime_nsecs_noise +=
+ abs((s64)(walltime_nsecs[i] - walltime_nsecs_avg));
+ runtime_cycles_noise +=
+ abs((s64)(runtime_cycles[i] - runtime_cycles_avg));
+
+ for (j = 0; j < nr_counters; j++) {
+ event_res_noise[j][0] +=
+ abs((s64)(event_res[i][j][0] - event_res_avg[j][0]));
+ event_res_noise[j][1] +=
+ abs((s64)(event_res[i][j][1] - event_res_avg[j][1]));
+ event_res_noise[j][2] +=
+ abs((s64)(event_res[i][j][2] - event_res_avg[j][2]));
+ }
+ }
+}
+
+static void print_stat(int argc, const char **argv)
+{
+ int i, counter;
+
+ calc_avg();
+
+ fflush(stdout);
+
+ fprintf(stderr, "\n");
+ fprintf(stderr, " Performance counter stats for \'%s", argv[0]);
+
+ for (i = 1; i < argc; i++)
+ fprintf(stderr, " %s", argv[i]);
+
+ fprintf(stderr, "\'");
+ if (run_count > 1)
+ fprintf(stderr, " (%d runs)", run_count);
+ fprintf(stderr, ":\n\n");
+
+ for (counter = 0; counter < nr_counters; counter++)
+ print_counter(counter);
+
+
+ fprintf(stderr, "\n");
+ fprintf(stderr, " %14.9f seconds time elapsed.\n",
+ (double)walltime_nsecs_avg/1e9);
+ fprintf(stderr, "\n");
+}
+
+static volatile int signr = -1;
+
+static void skip_signal(int signo)
+{
+ signr = signo;
+}
+
+static void sig_atexit(void)
+{
+ if (signr == -1)
+ return;
+
+ signal(signr, SIG_DFL);
+ kill(getpid(), signr);
+}
+
+int cmd_test(int argc, const char **argv, const char *prefix)
+{
+ int status;
+
+ page_size = sysconf(_SC_PAGE_SIZE);
+
+ memcpy(attrs, default_attrs, sizeof(attrs));
+
+ if (!nr_counters)
+ nr_counters = 8;
+
+ nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+ assert(nr_cpus <= MAX_NR_CPUS);
+ assert(nr_cpus >= 0);
+
+ /*
+ * We dont want to block the signals - that would cause
+ * child tasks to inherit that and Ctrl-C would not work.
+ * What we want is for Ctrl-C to work in the exec()-ed
+ * task, but being ignored by perf stat itself:
+ */
+ atexit(sig_atexit);
+ signal(SIGINT, skip_signal);
+ signal(SIGALRM, skip_signal);
+ signal(SIGABRT, skip_signal);
+
+ status = 0;
+ for (run_idx = 0; run_idx < run_count; run_idx++) {
+ if (run_count != 1 && verbose)
+ fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx+1);
+ status = run_perf_stat(argc, argv);
+ }
+
+ print_stat(argc, argv);
+
+ return status;
+}
diff --git a/tools/perf/builtin.h b/tools/perf/builtin.h
index 51d1682..3ed0362 100644
--- a/tools/perf/builtin.h
+++ b/tools/perf/builtin.h
@@ -22,5 +22,6 @@ extern int cmd_stat(int argc, const char **argv, const char *prefix);
extern int cmd_top(int argc, const char **argv, const char *prefix);
extern int cmd_version(int argc, const char **argv, const char *prefix);
extern int cmd_list(int argc, const char **argv, const char *prefix);
+extern int cmd_test(int argc, const char **argv, const char *prefix);
#endif
diff --git a/tools/perf/command-list.txt b/tools/perf/command-list.txt
index eebce30..f53544c 100644
--- a/tools/perf/command-list.txt
+++ b/tools/perf/command-list.txt
@@ -7,4 +7,5 @@ perf-list mainporcelain common
perf-record mainporcelain common
perf-report mainporcelain common
perf-stat mainporcelain common
+perf-test mainporcelain common
perf-top mainporcelain common
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 4eb7259..9f98f5e 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -262,6 +262,7 @@ static void handle_internal_command(int argc, const char **argv)
{ "record", cmd_record, 0 },
{ "report", cmd_report, 0 },
{ "stat", cmd_stat, 0 },
+ { "test", cmd_test, 0 },
{ "top", cmd_top, 0 },
{ "annotate", cmd_annotate, 0 },
{ "version", cmd_version, 0 },
--
1.6.0.6
--
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