[PATCH 25/31] perf, tools: Add perf stat --transaction
From: Andi Kleen
Date: Fri Sep 28 2012 - 00:34:29 EST
From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Add support to perf stat to print the basic transactional execution statistics:
Total cycles, Cycles in Transaction, Cycles in aborted transsactions
using the intx and intx_checkpoint qualifiers.
Transaction Starts and Elision Starts, to compute the average transaction length.
This is a reasonable overview over the success of the transactions.
Enable with a new --transaction / -T option.
This requires measuring these events in a group, since they depend on each
other
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
tools/perf/Documentation/perf-stat.txt | 3 +
tools/perf/builtin-stat.c | 104 +++++++++++++++++++++++++++++---
2 files changed, 99 insertions(+), 8 deletions(-)
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index 2fa173b..6e55bd9 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -108,7 +108,10 @@ with it. --append may be used here. Examples:
3>results perf stat --log-fd 3 -- $cmd
3>>results perf stat --log-fd 3 --append -- $cmd
+-T::
+--transaction::
+Print statistics of transactional execution. Implies --group.
EXAMPLES
--------
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 861f0ae..2364605 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -64,6 +64,9 @@
#define CNTR_NOT_SUPPORTED "<not supported>"
#define CNTR_NOT_COUNTED "<not counted>"
+#define is_intx(e) ((e)->attr.intx && !(e)->attr.intx_checkpointed)
+#define is_intx_cp(e) ((e)->attr.intx && (e)->attr.intx_checkpointed)
+
static struct perf_event_attr default_attrs[] = {
{ .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK },
@@ -171,7 +174,21 @@ static struct perf_event_attr very_very_detailed_attrs[] = {
(PERF_COUNT_HW_CACHE_RESULT_MISS << 16) },
};
+/*
+ * Transactional memory stats (-T)
+ * Must run as a group.
+ */
+static struct perf_event_attr transaction_attrs[] = {
+ { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK },
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS },
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES },
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES, .intx = 1 },
+ { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES,
+ .intx = 1, .intx_checkpointed = 1 },
+ { .type = PERF_TYPE_HW_TRANSACTION, .config = PERF_COUNT_HW_TRANSACTION_START },
+ { .type = PERF_TYPE_HW_TRANSACTION, .config = PERF_COUNT_HW_ELISION_START },
+};
static struct perf_evlist *evsel_list;
@@ -187,6 +204,7 @@ static bool no_aggr = false;
static pid_t child_pid = -1;
static bool null_run = false;
static int detailed_run = 0;
+static bool transaction_run = false;
static bool sync_run = false;
static bool big_num = true;
static int big_num_opt = -1;
@@ -275,7 +293,11 @@ static struct stats runtime_l1_icache_stats[MAX_NR_CPUS];
static struct stats runtime_ll_cache_stats[MAX_NR_CPUS];
static struct stats runtime_itlb_cache_stats[MAX_NR_CPUS];
static struct stats runtime_dtlb_cache_stats[MAX_NR_CPUS];
+static struct stats runtime_cycles_intx_stats[MAX_NR_CPUS];
+static struct stats runtime_cycles_intxcp_stats[MAX_NR_CPUS];
static struct stats walltime_nsecs_stats;
+static struct stats runtime_transaction_stats[MAX_NR_CPUS];
+static struct stats runtime_elision_stats[MAX_NR_CPUS];
static int create_perf_stat_counter(struct perf_evsel *evsel,
struct perf_evsel *first)
@@ -350,10 +372,18 @@ static void update_shadow_stats(struct perf_evsel *counter, u64 *count)
{
if (perf_evsel__match(counter, SOFTWARE, SW_TASK_CLOCK))
update_stats(&runtime_nsecs_stats[0], count[0]);
- else if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES))
- update_stats(&runtime_cycles_stats[0], count[0]);
- else if (perf_evsel__match(counter, HARDWARE, HW_STALLED_CYCLES_FRONTEND))
- update_stats(&runtime_stalled_cycles_front_stats[0], count[0]);
+ else if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES)) {
+ if (is_intx(counter))
+ update_stats(&runtime_cycles_intx_stats[0], count[0]);
+ else if (is_intx_cp(counter))
+ update_stats(&runtime_cycles_intxcp_stats[0], count[0]);
+ else
+ update_stats(&runtime_cycles_stats[0], count[0]);
+ } else if (perf_evsel__match(counter, HW_TRANSACTION,
+ HW_TRANSACTION_START))
+ update_stats(&runtime_transaction_stats[0], count[0]);
+ else if (perf_evsel__match(counter, HW_TRANSACTION, HW_ELISION_START))
+ update_stats(&runtime_elision_stats[0], count[0]);
else if (perf_evsel__match(counter, HARDWARE, HW_STALLED_CYCLES_BACKEND))
update_stats(&runtime_stalled_cycles_back_stats[0], count[0]);
else if (perf_evsel__match(counter, HARDWARE, HW_BRANCH_INSTRUCTIONS))
@@ -774,7 +804,7 @@ static void print_ll_cache_misses(int cpu, struct perf_evsel *evsel __used, doub
static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
{
- double total, ratio = 0.0;
+ double total, ratio = 0.0, total2;
char cpustr[16] = { '\0', };
const char *fmt;
@@ -868,12 +898,50 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
} else if (perf_evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES_BACKEND)) {
print_stalled_cycles_backend(cpu, evsel, avg);
} else if (perf_evsel__match(evsel, HARDWARE, HW_CPU_CYCLES)) {
- total = avg_stats(&runtime_nsecs_stats[cpu]);
+ if (is_intx(evsel)) {
+ total = avg_stats(&runtime_cycles_stats[cpu]);
+ if (total)
+ fprintf(output,
+ " # %5.2f%% transactional ",
+ 100.0 * (avg / total));
+ } else if (is_intx_cp(evsel)) {
+ total = avg_stats(&runtime_cycles_stats[cpu]);
+ total2 = avg_stats(&runtime_cycles_intx_stats[cpu]);
+ if (total)
+ fprintf(output,
+ " # %5.2f%% aborted cycles ",
+ 100.0 * ((total2-avg) / total));
+ } else {
+ total = avg_stats(&runtime_nsecs_stats[cpu]);
+
+ if (total)
+ ratio = 1.0 * avg / total;
+
+ fprintf(output, " # %8.3f GHz ",
+ ratio);
+ }
+ } else if (perf_evsel__match(evsel, HW_TRANSACTION,
+ HW_TRANSACTION_START) &&
+ avg > 0 &&
+ runtime_cycles_intx_stats[cpu].n != 0) {
+ total = avg_stats(&runtime_cycles_intx_stats[cpu]);
+
+ if (total)
+ ratio = total / avg;
+
+ fprintf(output, " # %8.0f cycles / transaction ", ratio);
+
+ } else if (perf_evsel__match(evsel, HW_TRANSACTION,
+ HW_ELISION_START) &&
+ avg > 0 &&
+ runtime_cycles_intx_stats[cpu].n != 0) {
+ total = avg_stats(&runtime_cycles_intx_stats[cpu]);
if (total)
- ratio = 1.0 * avg / total;
+ ratio = total / avg;
+
+ fprintf(output, " # %8.0f cycles / elision ", ratio);
- fprintf(output, " # %8.3f GHz ", ratio);
} else if (runtime_nsecs_stats[cpu].n != 0) {
char unit = 'M';
@@ -1068,6 +1136,16 @@ static int stat__set_big_num(const struct option *opt __used,
return 0;
}
+/* Must force groups for transactions */
+static int stat__parse_transaction(const struct option *opt __used,
+ const char *str __used,
+ int unset __used)
+{
+ transaction_run = true;
+ group = true;
+ return 0;
+}
+
static bool append_file;
static const struct option options[] = {
@@ -1115,6 +1193,9 @@ static const struct option options[] = {
OPT_BOOLEAN(0, "append", &append_file, "append to the output file"),
OPT_INTEGER(0, "log-fd", &output_fd,
"log output to fd, instead of stderr"),
+ OPT_CALLBACK_NOOPT('T', "transaction", NULL, NULL,
+ "capture hardware transaction success",
+ stat__parse_transaction),
OPT_END()
};
@@ -1128,6 +1209,13 @@ static int add_default_attributes(void)
if (null_run)
return 0;
+ if (transaction_run) {
+ if (perf_evlist__add_attrs_array(evsel_list,
+ transaction_attrs) < 0)
+ return -1;
+ return 0;
+ }
+
if (!evsel_list->nr_entries) {
if (perf_evlist__add_default_attrs(evsel_list, default_attrs) < 0)
return -1;
--
1.7.7.6
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