android_kernel_xiaomi_sm8350/tools/perf/util/stat.h
Srikar Dronamraju b63fd11cce perf stat: Reset previous counts on repeat with interval
When using 'perf stat' with repeat and interval option, it shows wrong
values for events.

The wrong values will be shown for the first interval on the second and
subsequent repetitions.

Without the fix:

  # perf stat -r 3 -I 2000 -e faults -e sched:sched_switch -a sleep 5

     2.000282489                 53      faults
     2.000282489                513      sched:sched_switch
     4.005478208              3,721      faults
     4.005478208              2,666      sched:sched_switch
     5.025470933                395      faults
     5.025470933              1,307      sched:sched_switch
     2.009602825 1,84,46,74,40,73,70,95,47,520      faults 		<------
     2.009602825 1,84,46,74,40,73,70,95,49,568      sched:sched_switch  <------
     4.019612206              4,730      faults
     4.019612206              2,746      sched:sched_switch
     5.039615484              3,953      faults
     5.039615484              1,496      sched:sched_switch
     2.000274620 1,84,46,74,40,73,70,95,47,520      faults		<------
     2.000274620 1,84,46,74,40,73,70,95,47,520      sched:sched_switch	<------
     4.000480342              4,282      faults
     4.000480342              2,303      sched:sched_switch
     5.000916811              1,322      faults
     5.000916811              1,064      sched:sched_switch
  #

prev_raw_counts is allocated when using intervals. This is used when
calculating the difference in the counts of events when using interval.

The current counts are stored in prev_raw_counts to calculate the
differences in the next iteration.

On the first interval of the second and subsequent repetitions,
prev_raw_counts would be the values stored in the last interval of the
previous repetitions, while the current counts will only be for the
first interval of the current repetition.

Hence there is a possibility of events showing up as big number.

Fix this by resetting prev_raw_counts whenever perf stat repeats the
command.

With the fix:

  # perf stat -r 3 -I 2000 -e faults -e sched:sched_switch -a sleep 5

     2.019349347              2,597      faults
     2.019349347              2,753      sched:sched_switch
     4.019577372              3,098      faults
     4.019577372              2,532      sched:sched_switch
     5.019415481              1,879      faults
     5.019415481              1,356      sched:sched_switch
     2.000178813              8,468      faults
     2.000178813              2,254      sched:sched_switch
     4.000404621              7,440      faults
     4.000404621              1,266      sched:sched_switch
     5.040196079              2,458      faults
     5.040196079                556      sched:sched_switch
     2.000191939              6,870      faults
     2.000191939              1,170      sched:sched_switch
     4.000414103                541      faults
     4.000414103                902      sched:sched_switch
     5.000809863                450      faults
     5.000809863                364      sched:sched_switch
  #

Committer notes:

This was broken since the cset introducing the --interval feature, i.e.
--repeat + --interval wasn't tested at that point, add the Fixes tag so
that automatic scripts can pick this up.

Fixes: 13370a9b5b ("perf stat: Add interval printing")
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: stable@vger.kernel.org # v3.9+
Link: http://lore.kernel.org/lkml/20190904094738.9558-2-srikar@linux.vnet.ibm.com
[ Fixed up conflicts with libperf, i.e. some perf_{evsel,evlist} lost the 'perf' prefix ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2019-09-20 10:28:26 -03:00

222 lines
5.4 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __PERF_STATS_H
#define __PERF_STATS_H
#include <linux/types.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/resource.h>
#include "rblist.h"
struct perf_cpu_map;
struct perf_stat_config;
struct timespec;
struct stats {
double n, mean, M2;
u64 max, min;
};
enum perf_stat_evsel_id {
PERF_STAT_EVSEL_ID__NONE = 0,
PERF_STAT_EVSEL_ID__CYCLES_IN_TX,
PERF_STAT_EVSEL_ID__TRANSACTION_START,
PERF_STAT_EVSEL_ID__ELISION_START,
PERF_STAT_EVSEL_ID__CYCLES_IN_TX_CP,
PERF_STAT_EVSEL_ID__TOPDOWN_TOTAL_SLOTS,
PERF_STAT_EVSEL_ID__TOPDOWN_SLOTS_ISSUED,
PERF_STAT_EVSEL_ID__TOPDOWN_SLOTS_RETIRED,
PERF_STAT_EVSEL_ID__TOPDOWN_FETCH_BUBBLES,
PERF_STAT_EVSEL_ID__TOPDOWN_RECOVERY_BUBBLES,
PERF_STAT_EVSEL_ID__SMI_NUM,
PERF_STAT_EVSEL_ID__APERF,
PERF_STAT_EVSEL_ID__MAX,
};
struct perf_stat_evsel {
struct stats res_stats[3];
enum perf_stat_evsel_id id;
u64 *group_data;
};
enum aggr_mode {
AGGR_NONE,
AGGR_GLOBAL,
AGGR_SOCKET,
AGGR_DIE,
AGGR_CORE,
AGGR_THREAD,
AGGR_UNSET,
};
enum {
CTX_BIT_USER = 1 << 0,
CTX_BIT_KERNEL = 1 << 1,
CTX_BIT_HV = 1 << 2,
CTX_BIT_HOST = 1 << 3,
CTX_BIT_IDLE = 1 << 4,
CTX_BIT_MAX = 1 << 5,
};
#define NUM_CTX CTX_BIT_MAX
enum stat_type {
STAT_NONE = 0,
STAT_NSECS,
STAT_CYCLES,
STAT_STALLED_CYCLES_FRONT,
STAT_STALLED_CYCLES_BACK,
STAT_BRANCHES,
STAT_CACHEREFS,
STAT_L1_DCACHE,
STAT_L1_ICACHE,
STAT_LL_CACHE,
STAT_ITLB_CACHE,
STAT_DTLB_CACHE,
STAT_CYCLES_IN_TX,
STAT_TRANSACTION,
STAT_ELISION,
STAT_TOPDOWN_TOTAL_SLOTS,
STAT_TOPDOWN_SLOTS_ISSUED,
STAT_TOPDOWN_SLOTS_RETIRED,
STAT_TOPDOWN_FETCH_BUBBLES,
STAT_TOPDOWN_RECOVERY_BUBBLES,
STAT_SMI_NUM,
STAT_APERF,
STAT_MAX
};
struct runtime_stat {
struct rblist value_list;
};
typedef int (*aggr_get_id_t)(struct perf_stat_config *config,
struct perf_cpu_map *m, int cpu);
struct perf_stat_config {
enum aggr_mode aggr_mode;
bool scale;
bool no_inherit;
bool identifier;
bool csv_output;
bool interval_clear;
bool metric_only;
bool null_run;
bool ru_display;
bool big_num;
bool no_merge;
bool walltime_run_table;
FILE *output;
unsigned int interval;
unsigned int timeout;
unsigned int initial_delay;
unsigned int unit_width;
unsigned int metric_only_len;
int times;
int run_count;
int print_free_counters_hint;
int print_mixed_hw_group_error;
struct runtime_stat *stats;
int stats_num;
const char *csv_sep;
struct stats *walltime_nsecs_stats;
struct rusage ru_data;
struct perf_cpu_map *aggr_map;
aggr_get_id_t aggr_get_id;
struct perf_cpu_map *cpus_aggr_map;
u64 *walltime_run;
struct rblist metric_events;
};
void update_stats(struct stats *stats, u64 val);
double avg_stats(struct stats *stats);
double stddev_stats(struct stats *stats);
double rel_stddev_stats(double stddev, double avg);
static inline void init_stats(struct stats *stats)
{
stats->n = 0.0;
stats->mean = 0.0;
stats->M2 = 0.0;
stats->min = (u64) -1;
stats->max = 0;
}
struct evsel;
struct evlist;
struct perf_aggr_thread_value {
struct evsel *counter;
int id;
double uval;
u64 val;
u64 run;
u64 ena;
};
bool __perf_evsel_stat__is(struct evsel *evsel,
enum perf_stat_evsel_id id);
#define perf_stat_evsel__is(evsel, id) \
__perf_evsel_stat__is(evsel, PERF_STAT_EVSEL_ID__ ## id)
extern struct runtime_stat rt_stat;
extern struct stats walltime_nsecs_stats;
typedef void (*print_metric_t)(struct perf_stat_config *config,
void *ctx, const char *color, const char *unit,
const char *fmt, double val);
typedef void (*new_line_t)(struct perf_stat_config *config, void *ctx);
void runtime_stat__init(struct runtime_stat *st);
void runtime_stat__exit(struct runtime_stat *st);
void perf_stat__init_shadow_stats(void);
void perf_stat__reset_shadow_stats(void);
void perf_stat__reset_shadow_per_stat(struct runtime_stat *st);
void perf_stat__update_shadow_stats(struct evsel *counter, u64 count,
int cpu, struct runtime_stat *st);
struct perf_stat_output_ctx {
void *ctx;
print_metric_t print_metric;
new_line_t new_line;
bool force_header;
};
void perf_stat__print_shadow_stats(struct perf_stat_config *config,
struct evsel *evsel,
double avg, int cpu,
struct perf_stat_output_ctx *out,
struct rblist *metric_events,
struct runtime_stat *st);
void perf_stat__collect_metric_expr(struct evlist *);
int perf_evlist__alloc_stats(struct evlist *evlist, bool alloc_raw);
void perf_evlist__free_stats(struct evlist *evlist);
void perf_evlist__reset_stats(struct evlist *evlist);
void perf_evlist__reset_prev_raw_counts(struct evlist *evlist);
int perf_stat_process_counter(struct perf_stat_config *config,
struct evsel *counter);
struct perf_tool;
union perf_event;
struct perf_session;
struct target;
int perf_event__process_stat_event(struct perf_session *session,
union perf_event *event);
size_t perf_event__fprintf_stat(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_stat_round(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_stat_config(union perf_event *event, FILE *fp);
int create_perf_stat_counter(struct evsel *evsel,
struct perf_stat_config *config,
struct target *target);
void
perf_evlist__print_counters(struct evlist *evlist,
struct perf_stat_config *config,
struct target *_target,
struct timespec *ts,
int argc, const char **argv);
#endif