Currently perf-stat supports to print counts at regular interval (-I),
but it's not very easy for user to get the overall statistics.
With this patchset, it supports to report the summary at the end of
interval output.
For example,
root@kbl-ppc:~# perf stat -e cycles -I1000 --interval-count 2
# time counts unit events
1.000412064 2,281,114 cycles
2.001383658 2,547,880 cycles
Performance counter stats for 'system wide':
4,828,994 cycles
2.002860349 seconds time elapsed
root@kbl-ppc:~# perf stat -e cycles,instructions -I1000 --interval-count 2
# time counts unit events
1.000389902 1,536,093 cycles
1.000389902 420,226 instructions # 0.27 insn per cycle
2.001433453 2,213,952 cycles
2.001433453 735,465 instructions # 0.33 insn per cycle
Performance counter stats for 'system wide':
3,750,045 cycles
1,155,691 instructions # 0.31 insn per cycle
2.003023361 seconds time elapsed
root@kbl-ppc:~# perf stat -M CPI,IPC -I1000 --interval-count 2
# time counts unit events
1.000435121 905,303 inst_retired.any # 2.9 CPI
1.000435121 2,663,333 cycles
1.000435121 914,702 inst_retired.any # 0.3 IPC
1.000435121 2,676,559 cpu_clk_unhalted.thread
2.001615941 1,951,092 inst_retired.any # 1.8 CPI
2.001615941 3,551,357 cycles
2.001615941 1,950,837 inst_retired.any # 0.5 IPC
2.001615941 3,551,044 cpu_clk_unhalted.thread
Performance counter stats for 'system wide':
2,856,395 inst_retired.any # 2.2 CPI
6,214,690 cycles
2,865,539 inst_retired.any # 0.5 IPC
6,227,603 cpu_clk_unhalted.thread
2.003403078 seconds time elapsed
v5:
---
1. Create new patch "perf stat: Save aggr value to first member
of prev_raw_counts".
2. Call perf_evlist__save_aggr_prev_raw_counts to save aggr value
to first member of prev_raw_counts for AGGR_GLOBAL. Then next,
perf_stat_process_counter can create aggr values from per cpu
values.
Following patches are impacted in v5:
perf stat: Copy counts from prev_raw_counts to evsel->counts
perf stat: Save aggr value to first member of prev_raw_counts
perf stat: Report summary for interval mode
v4:
---
1. Create runtime_stat_reset.
2. Zero the aggr in perf_counts__reset and use it to reset
prev_raw_counts.
3. Move affinity setup and read_counter_cpu to a new function
read_affinity_counters. It's only called when stat_config.summary
is not set.
v3:
---
1. 'perf stat: Fix wrong per-thread runtime stat for interval mode'
is a new patch which fixes an existing issue found in test.
2. We use the prev_raw_counts for summary counts. Drop the summary_counts in v2.
3. Fix some issues.
v2:
---
Rebase to perf/core branch
Jin Yao (5):
perf stat: Fix wrong per-thread runtime stat for interval mode
perf counts: Reset prev_raw_counts counts
perf stat: Copy counts from prev_raw_counts to evsel->counts
perf stat: Save aggr value to first member of prev_raw_counts
perf stat: Report summary for interval mode
tools/perf/builtin-stat.c | 101 ++++++++++++++++++++++++++------------
tools/perf/util/counts.c | 4 +-
tools/perf/util/counts.h | 1 +
tools/perf/util/stat.c | 43 +++++++++++++---
tools/perf/util/stat.h | 3 ++
5 files changed, 113 insertions(+), 39 deletions(-)
--
2.17.1
Currently perf-stat supports to print counts at regular interval (-I),
but it's not very easy for user to get the overall statistics.
The patch uses 'evsel->prev_raw_counts' to get counts for summary.
Copy the counts to 'evsel->counts' after printing the interval results.
Next, we just follow the non-interval processing.
Let's see some examples,
root@kbl-ppc:~# perf stat -e cycles -I1000 --interval-count 2
# time counts unit events
1.000412064 2,281,114 cycles
2.001383658 2,547,880 cycles
Performance counter stats for 'system wide':
4,828,994 cycles
2.002860349 seconds time elapsed
root@kbl-ppc:~# perf stat -e cycles,instructions -I1000 --interval-count 2
# time counts unit events
1.000389902 1,536,093 cycles
1.000389902 420,226 instructions # 0.27 insn per cycle
2.001433453 2,213,952 cycles
2.001433453 735,465 instructions # 0.33 insn per cycle
Performance counter stats for 'system wide':
3,750,045 cycles
1,155,691 instructions # 0.31 insn per cycle
2.003023361 seconds time elapsed
root@kbl-ppc:~# perf stat -M CPI,IPC -I1000 --interval-count 2
# time counts unit events
1.000435121 905,303 inst_retired.any # 2.9 CPI
1.000435121 2,663,333 cycles
1.000435121 914,702 inst_retired.any # 0.3 IPC
1.000435121 2,676,559 cpu_clk_unhalted.thread
2.001615941 1,951,092 inst_retired.any # 1.8 CPI
2.001615941 3,551,357 cycles
2.001615941 1,950,837 inst_retired.any # 0.5 IPC
2.001615941 3,551,044 cpu_clk_unhalted.thread
Performance counter stats for 'system wide':
2,856,395 inst_retired.any # 2.2 CPI
6,214,690 cycles
2,865,539 inst_retired.any # 0.5 IPC
6,227,603 cpu_clk_unhalted.thread
2.003403078 seconds time elapsed
v5:
---
Call perf_evlist__save_aggr_prev_raw_counts to save aggr value
to first member of prev_raw_counts for AGGR_GLOBAL. Then next,
perf_stat_process_counter can create aggr values from per cpu
values.
v4:
---
Move affinity setup and read_counter_cpu to a new function
read_affinity_counters. It's only called when stat_config.summary
is not set.
v3:
---
Use evsel->prev_raw_counts for summary counts
v2:
---
Rebase to perf/core branch
Signed-off-by: Jin Yao <[email protected]>
---
tools/perf/builtin-stat.c | 31 ++++++++++++++++++++++++++++---
tools/perf/util/stat.c | 2 +-
tools/perf/util/stat.h | 1 +
3 files changed, 30 insertions(+), 4 deletions(-)
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index f3b3a59ac7d2..24deed746325 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -314,14 +314,14 @@ static int read_counter_cpu(struct evsel *counter, struct timespec *rs, int cpu)
return 0;
}
-static void read_counters(struct timespec *rs)
+static int read_affinity_counters(struct timespec *rs)
{
struct evsel *counter;
struct affinity affinity;
int i, ncpus, cpu;
if (affinity__setup(&affinity) < 0)
- return;
+ return -1;
ncpus = perf_cpu_map__nr(evsel_list->core.all_cpus);
if (!target__has_cpu(&target) || target__has_per_thread(&target))
@@ -341,6 +341,15 @@ static void read_counters(struct timespec *rs)
}
}
affinity__cleanup(&affinity);
+ return 0;
+}
+
+static void read_counters(struct timespec *rs)
+{
+ struct evsel *counter;
+
+ if (!stat_config.summary && (read_affinity_counters(rs) < 0))
+ return;
evlist__for_each_entry(evsel_list, counter) {
if (counter->err)
@@ -394,6 +403,7 @@ static void runtime_stat_reset(struct perf_stat_config *config)
static void process_interval(void)
{
struct timespec ts, rs;
+ struct stats walltime_nsecs_stats_bak;
clock_gettime(CLOCK_MONOTONIC, &ts);
diff_timespec(&rs, &ts, &ref_time);
@@ -407,9 +417,11 @@ static void process_interval(void)
pr_err("failed to write stat round event\n");
}
+ walltime_nsecs_stats_bak = walltime_nsecs_stats;
init_stats(&walltime_nsecs_stats);
update_stats(&walltime_nsecs_stats, stat_config.interval * 1000000);
print_counters(&rs, 0, NULL);
+ walltime_nsecs_stats = walltime_nsecs_stats_bak;
}
static void enable_counters(void)
@@ -765,6 +777,19 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
update_stats(&walltime_nsecs_stats, t1 - t0);
+ if (interval) {
+ stat_config.interval = 0;
+ stat_config.summary = true;
+
+ if (stat_config.aggr_mode == AGGR_GLOBAL)
+ perf_evlist__save_aggr_prev_raw_counts(evsel_list);
+
+ perf_evlist__copy_prev_raw_counts(evsel_list);
+ perf_evlist__reset_prev_raw_counts(evsel_list);
+ runtime_stat_reset(&stat_config);
+ perf_stat__reset_shadow_per_stat(&rt_stat);
+ }
+
/*
* Closing a group leader splits the group, and as we only disable
* group leaders, results in remaining events becoming enabled. To
@@ -2159,7 +2184,7 @@ int cmd_stat(int argc, const char **argv)
}
}
- if (!forever && status != -1 && !interval)
+ if (!forever && status != -1 && (!interval || stat_config.summary))
print_counters(NULL, argc, argv);
if (STAT_RECORD) {
diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index fbabdd5b9b62..481543c422a7 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -398,7 +398,7 @@ int perf_stat_process_counter(struct perf_stat_config *config,
* interval mode, otherwise overall avg running
* averages will be shown for each interval.
*/
- if (config->interval) {
+ if (config->interval || config->summary) {
for (i = 0; i < 3; i++)
init_stats(&ps->res_stats[i]);
}
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index 18ead55756cc..a5604a20bdca 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -110,6 +110,7 @@ struct perf_stat_config {
bool all_kernel;
bool all_user;
bool percore_show_thread;
+ bool summary;
FILE *output;
unsigned int interval;
unsigned int timeout;
--
2.17.1
On 5/14/20 11:06 AM, Jin Yao wrote:
> Currently perf-stat supports to print counts at regular interval (-I),
> but it's not very easy for user to get the overall statistics.
>
> With this patchset, it supports to report the summary at the end of
> interval output.
>
> For example,
>
> root@kbl-ppc:~# perf stat -e cycles -I1000 --interval-count 2
> # time counts unit events
> 1.000412064 2,281,114 cycles
> 2.001383658 2,547,880 cycles
>
> Performance counter stats for 'system wide':
>
> 4,828,994 cycles
>
> 2.002860349 seconds time elapsed
>
> root@kbl-ppc:~# perf stat -e cycles,instructions -I1000 --interval-count 2
> # time counts unit events
> 1.000389902 1,536,093 cycles
> 1.000389902 420,226 instructions # 0.27 insn per cycle
> 2.001433453 2,213,952 cycles
> 2.001433453 735,465 instructions # 0.33 insn per cycle
>
> Performance counter stats for 'system wide':
>
> 3,750,045 cycles
> 1,155,691 instructions # 0.31 insn per cycle
>
> 2.003023361 seconds time elapsed
>
> root@kbl-ppc:~# perf stat -M CPI,IPC -I1000 --interval-count 2
> # time counts unit events
> 1.000435121 905,303 inst_retired.any # 2.9 CPI
> 1.000435121 2,663,333 cycles
> 1.000435121 914,702 inst_retired.any # 0.3 IPC
> 1.000435121 2,676,559 cpu_clk_unhalted.thread
> 2.001615941 1,951,092 inst_retired.any # 1.8 CPI
> 2.001615941 3,551,357 cycles
> 2.001615941 1,950,837 inst_retired.any # 0.5 IPC
> 2.001615941 3,551,044 cpu_clk_unhalted.thread
>
> Performance counter stats for 'system wide':
>
> 2,856,395 inst_retired.any # 2.2 CPI
> 6,214,690 cycles
> 2,865,539 inst_retired.any # 0.5 IPC
> 6,227,603 cpu_clk_unhalted.thread
>
> 2.003403078 seconds time elapsed
Hi Jin,
Reporting the summary will be great for understanding overall stats. So, Before the
patch where we are reseting rt_stat before read_counters to make sure, whatever printing
in final aggregate is as per counts on that interval,
we used to update stats->means and other info as described in
RFC: https://lkml.org/lkml/2020/3/24/158
Now, stats->means is same as counts which we are using in generic_metric function. Is this expected behavior?
I am not sure, if data like stats->means and all suppose to update per interval or we are using it somewhere else.
So, As we call update_stats for each event and for each interval, can we somehow use that
to print overall stats maybe by adding some var in `struct stats` to keep count of total counts for that event.
Please let me know if my understanding is fine.
Thanks,
Kajol Jain
>
> v5:
> ---
> 1. Create new patch "perf stat: Save aggr value to first member
> of prev_raw_counts".
>
> 2. Call perf_evlist__save_aggr_prev_raw_counts to save aggr value
> to first member of prev_raw_counts for AGGR_GLOBAL. Then next,
> perf_stat_process_counter can create aggr values from per cpu
> values.
>
> Following patches are impacted in v5:
> perf stat: Copy counts from prev_raw_counts to evsel->counts
> perf stat: Save aggr value to first member of prev_raw_counts
> perf stat: Report summary for interval mode
>
> v4:
> ---
> 1. Create runtime_stat_reset.
>
> 2. Zero the aggr in perf_counts__reset and use it to reset
> prev_raw_counts.
>
> 3. Move affinity setup and read_counter_cpu to a new function
> read_affinity_counters. It's only called when stat_config.summary
> is not set.
>
> v3:
> ---
> 1. 'perf stat: Fix wrong per-thread runtime stat for interval mode'
> is a new patch which fixes an existing issue found in test.
>
> 2. We use the prev_raw_counts for summary counts. Drop the summary_counts in v2.
>
> 3. Fix some issues.
>
> v2:
> ---
> Rebase to perf/core branch
>
> Jin Yao (5):
> perf stat: Fix wrong per-thread runtime stat for interval mode
> perf counts: Reset prev_raw_counts counts
> perf stat: Copy counts from prev_raw_counts to evsel->counts
> perf stat: Save aggr value to first member of prev_raw_counts
> perf stat: Report summary for interval mode
>
> tools/perf/builtin-stat.c | 101 ++++++++++++++++++++++++++------------
> tools/perf/util/counts.c | 4 +-
> tools/perf/util/counts.h | 1 +
> tools/perf/util/stat.c | 43 +++++++++++++---
> tools/perf/util/stat.h | 3 ++
> 5 files changed, 113 insertions(+), 39 deletions(-)
>
Hi Kajoljain,
On 5/14/2020 5:53 PM, kajoljain wrote:
>
>
> On 5/14/20 11:06 AM, Jin Yao wrote:
>> Currently perf-stat supports to print counts at regular interval (-I),
>> but it's not very easy for user to get the overall statistics.
>>
>> With this patchset, it supports to report the summary at the end of
>> interval output.
>>
>> For example,
>>
>> root@kbl-ppc:~# perf stat -e cycles -I1000 --interval-count 2
>> # time counts unit events
>> 1.000412064 2,281,114 cycles
>> 2.001383658 2,547,880 cycles
>>
>> Performance counter stats for 'system wide':
>>
>> 4,828,994 cycles
>>
>> 2.002860349 seconds time elapsed
>>
>> root@kbl-ppc:~# perf stat -e cycles,instructions -I1000 --interval-count 2
>> # time counts unit events
>> 1.000389902 1,536,093 cycles
>> 1.000389902 420,226 instructions # 0.27 insn per cycle
>> 2.001433453 2,213,952 cycles
>> 2.001433453 735,465 instructions # 0.33 insn per cycle
>>
>> Performance counter stats for 'system wide':
>>
>> 3,750,045 cycles
>> 1,155,691 instructions # 0.31 insn per cycle
>>
>> 2.003023361 seconds time elapsed
>>
>> root@kbl-ppc:~# perf stat -M CPI,IPC -I1000 --interval-count 2
>> # time counts unit events
>> 1.000435121 905,303 inst_retired.any # 2.9 CPI
>> 1.000435121 2,663,333 cycles
>> 1.000435121 914,702 inst_retired.any # 0.3 IPC
>> 1.000435121 2,676,559 cpu_clk_unhalted.thread
>> 2.001615941 1,951,092 inst_retired.any # 1.8 CPI
>> 2.001615941 3,551,357 cycles
>> 2.001615941 1,950,837 inst_retired.any # 0.5 IPC
>> 2.001615941 3,551,044 cpu_clk_unhalted.thread
>>
>> Performance counter stats for 'system wide':
>>
>> 2,856,395 inst_retired.any # 2.2 CPI
>> 6,214,690 cycles
>> 2,865,539 inst_retired.any # 0.5 IPC
>> 6,227,603 cpu_clk_unhalted.thread
>>
>> 2.003403078 seconds time elapsed
>
> Hi Jin,
> Reporting the summary will be great for understanding overall stats. So, Before the
> patch where we are reseting rt_stat before read_counters to make sure, whatever printing
> in final aggregate is as per counts on that interval,
>
Yes, I had similar thoughts, so I posted following patch.
https://lore.kernel.org/lkml/[email protected]/
> we used to update stats->means and other info as described in
>
> RFC: https://lkml.org/lkml/2020/3/24/158
>
I've checked your patch but sorry I'm also not very sure if it's the expected
behavior.
> Now, stats->means is same as counts which we are using in generic_metric function. Is this expected behavior?
> I am not sure, if data like stats->means and all suppose to update per interval or we are using it somewhere else.
>
I just think it's easy to understand, that is the metric calculated by the
counts per interval.
> So, As we call update_stats for each event and for each interval, can we somehow use that
> to print overall stats maybe by adding some var in `struct stats` to keep count of total counts for that event.
> Please let me know if my understanding is fine.
>
Adding var in 'struct stats' looks not enough (or more complicated), because
perf-stat also needs to report some counts according to different aggregation
modes (not only the metric). I just think copying total counts to current counts
is a easy way because we can reuse most of existing non-interval processing code.
Thanks
Jin Yao
> Thanks,
> Kajol Jain
>
>
>
>>
>> v5:
>> ---
>> 1. Create new patch "perf stat: Save aggr value to first member
>> of prev_raw_counts".
>>
>> 2. Call perf_evlist__save_aggr_prev_raw_counts to save aggr value
>> to first member of prev_raw_counts for AGGR_GLOBAL. Then next,
>> perf_stat_process_counter can create aggr values from per cpu
>> values.
>>
>> Following patches are impacted in v5:
>> perf stat: Copy counts from prev_raw_counts to evsel->counts
>> perf stat: Save aggr value to first member of prev_raw_counts
>> perf stat: Report summary for interval mode
>>
>> v4:
>> ---
>> 1. Create runtime_stat_reset.
>>
>> 2. Zero the aggr in perf_counts__reset and use it to reset
>> prev_raw_counts.
>>
>> 3. Move affinity setup and read_counter_cpu to a new function
>> read_affinity_counters. It's only called when stat_config.summary
>> is not set.
>>
>> v3:
>> ---
>> 1. 'perf stat: Fix wrong per-thread runtime stat for interval mode'
>> is a new patch which fixes an existing issue found in test.
>>
>> 2. We use the prev_raw_counts for summary counts. Drop the summary_counts in v2.
>>
>> 3. Fix some issues.
>>
>> v2:
>> ---
>> Rebase to perf/core branch
>>
>> Jin Yao (5):
>> perf stat: Fix wrong per-thread runtime stat for interval mode
>> perf counts: Reset prev_raw_counts counts
>> perf stat: Copy counts from prev_raw_counts to evsel->counts
>> perf stat: Save aggr value to first member of prev_raw_counts
>> perf stat: Report summary for interval mode
>>
>> tools/perf/builtin-stat.c | 101 ++++++++++++++++++++++++++------------
>> tools/perf/util/counts.c | 4 +-
>> tools/perf/util/counts.h | 1 +
>> tools/perf/util/stat.c | 43 +++++++++++++---
>> tools/perf/util/stat.h | 3 ++
>> 5 files changed, 113 insertions(+), 39 deletions(-)
>>
On Thu, May 14, 2020 at 01:36:38PM +0800, Jin Yao wrote:
SNIP
>
> evlist__for_each_entry(evsel_list, counter) {
> if (counter->err)
> @@ -394,6 +403,7 @@ static void runtime_stat_reset(struct perf_stat_config *config)
> static void process_interval(void)
> {
> struct timespec ts, rs;
> + struct stats walltime_nsecs_stats_bak;
>
> clock_gettime(CLOCK_MONOTONIC, &ts);
> diff_timespec(&rs, &ts, &ref_time);
> @@ -407,9 +417,11 @@ static void process_interval(void)
> pr_err("failed to write stat round event\n");
> }
>
> + walltime_nsecs_stats_bak = walltime_nsecs_stats;
> init_stats(&walltime_nsecs_stats);
> update_stats(&walltime_nsecs_stats, stat_config.interval * 1000000);
> print_counters(&rs, 0, NULL);
> + walltime_nsecs_stats = walltime_nsecs_stats_bak;
could we instead of above initialize walltime_nsecs_stats
in the condition below, like:
init_stats(&walltime_nsecs_stats);
update_stats(&walltime_nsecs_stats, stat_config.interval * 1000000);
jirka
> }
>
> static void enable_counters(void)
> @@ -765,6 +777,19 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
>
> update_stats(&walltime_nsecs_stats, t1 - t0);
>
> + if (interval) {
> + stat_config.interval = 0;
> + stat_config.summary = true;
> +
> + if (stat_config.aggr_mode == AGGR_GLOBAL)
> + perf_evlist__save_aggr_prev_raw_counts(evsel_list);
> +
> + perf_evlist__copy_prev_raw_counts(evsel_list);
> + perf_evlist__reset_prev_raw_counts(evsel_list);
> + runtime_stat_reset(&stat_config);
> + perf_stat__reset_shadow_per_stat(&rt_stat);
> + }
> +
SNIP
Hi Jiri,
On 5/18/2020 8:47 PM, Jiri Olsa wrote:
> On Thu, May 14, 2020 at 01:36:38PM +0800, Jin Yao wrote:
>
> SNIP
>
>>
>> evlist__for_each_entry(evsel_list, counter) {
>> if (counter->err)
>> @@ -394,6 +403,7 @@ static void runtime_stat_reset(struct perf_stat_config *config)
>> static void process_interval(void)
>> {
>> struct timespec ts, rs;
>> + struct stats walltime_nsecs_stats_bak;
>>
>> clock_gettime(CLOCK_MONOTONIC, &ts);
>> diff_timespec(&rs, &ts, &ref_time);
>> @@ -407,9 +417,11 @@ static void process_interval(void)
>> pr_err("failed to write stat round event\n");
>> }
>>
>> + walltime_nsecs_stats_bak = walltime_nsecs_stats;
>> init_stats(&walltime_nsecs_stats);
>> update_stats(&walltime_nsecs_stats, stat_config.interval * 1000000);
>> print_counters(&rs, 0, NULL);
>> + walltime_nsecs_stats = walltime_nsecs_stats_bak;
>
> could we instead of above initialize walltime_nsecs_stats
> in the condition below, like:
>
> init_stats(&walltime_nsecs_stats);
> update_stats(&walltime_nsecs_stats, stat_config.interval * 1000000);
>
> jirka
>
Yes, I think that's OK and better. My fix is:
@@ -775,11 +772,11 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
if (stat_config.walltime_run_table)
stat_config.walltime_run[run_idx] = t1 - t0;
- update_stats(&walltime_nsecs_stats, t1 - t0);
-
if (interval) {
stat_config.interval = 0;
stat_config.summary = true;
+ init_stats(&walltime_nsecs_stats);
+ update_stats(&walltime_nsecs_stats, t1 - t0);
if (stat_config.aggr_mode == AGGR_GLOBAL)
perf_evlist__save_aggr_prev_raw_counts(evsel_list);
@@ -788,7 +785,8 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
perf_evlist__reset_prev_raw_counts(evsel_list);
runtime_stat_reset(&stat_config);
perf_stat__reset_shadow_per_stat(&rt_stat);
- }
+ } else
+ update_stats(&walltime_nsecs_stats, t1 - t0);
/*
* Closing a group leader splits the group, and as we only disable
Thanks
Jin Yao
>> }
>>
>> static void enable_counters(void)
>> @@ -765,6 +777,19 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
>>
>> update_stats(&walltime_nsecs_stats, t1 - t0);
>>
>> + if (interval) {
>> + stat_config.interval = 0;
>> + stat_config.summary = true;
>> +
>> + if (stat_config.aggr_mode == AGGR_GLOBAL)
>> + perf_evlist__save_aggr_prev_raw_counts(evsel_list);
>> +
>> + perf_evlist__copy_prev_raw_counts(evsel_list);
>> + perf_evlist__reset_prev_raw_counts(evsel_list);
>> + runtime_stat_reset(&stat_config);
>> + perf_stat__reset_shadow_per_stat(&rt_stat);
>> + }
>> +
>
> SNIP
>