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trace-read.c
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trace-read.c
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/*
* Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License (not later!)
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#define _LARGEFILE64_SOURCE
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <pthread.h>
#include <fcntl.h>
#include <signal.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include "trace-local.h"
#include "trace-hash.h"
#include "kbuffer.h"
#include "list.h"
static struct filter_str {
struct filter_str *next;
char *filter;
int neg;
} *filter_strings;
static struct filter_str **filter_next = &filter_strings;
struct filter {
struct filter *next;
struct event_filter *filter;
};
struct event_str {
struct event_str *next;
const char *event;
};
struct handle_list {
struct list_head list;
struct tracecmd_input *handle;
const char *file;
int cpus;
int done;
struct pevent_record *record;
struct filter *event_filters;
struct filter *event_filter_out;
};
static struct list_head handle_list;
struct input_files {
struct list_head list;
const char *file;
unsigned long long tsoffset;
unsigned long long ts2secs;
};
static struct list_head input_files;
static struct input_files *last_input_file;
struct pid_list {
struct pid_list *next;
char *pid;
int free;
} *pid_list;
struct pid_list *comm_list;
static unsigned int page_size;
static int input_fd;
static const char *default_input_file = "trace.dat";
static const char *input_file;
static int multi_inputs;
static int max_file_size;
static int instances;
static int *filter_cpus;
static int nr_filter_cpus;
static int show_wakeup;
static int wakeup_id;
static int wakeup_new_id;
static int sched_id;
static int stacktrace_id;
static int profile;
static int buffer_breaks = 0;
static int debug = 0;
static int no_irqs;
static int no_softirqs;
static int tsdiff;
static struct format_field *wakeup_task;
static struct format_field *wakeup_success;
static struct format_field *wakeup_new_task;
static struct format_field *wakeup_new_success;
static struct format_field *sched_task;
static struct format_field *sched_prio;
static unsigned long long total_wakeup_lat;
static unsigned long wakeup_lat_count;
static unsigned long long total_wakeup_rt_lat;
static unsigned long wakeup_rt_lat_count;
struct wakeup_info {
struct trace_hash_item hash;
unsigned long long start;
int pid;
};
static struct hook_list *hooks;
static struct hook_list *last_hook;
#define WAKEUP_HASH_SIZE 1024
static struct trace_hash wakeup_hash;
/* Debug variables for testing tracecmd_read_at */
#define TEST_READ_AT 0
#if TEST_READ_AT
#define DO_TEST
static off64_t test_read_at_offset;
static int test_read_at_copy = 100;
static int test_read_at_index;
static void show_test(struct tracecmd_input *handle)
{
struct pevent *pevent;
struct pevent_record *record;
struct trace_seq s;
int cpu;
if (!test_read_at_offset) {
printf("\nNO RECORD COPIED\n");
return;
}
pevent = tracecmd_get_pevent(handle);
record = tracecmd_read_at(handle, test_read_at_offset, &cpu);
printf("\nHERE'S THE COPY RECORD\n");
trace_seq_init(&s);
pevent_print_event(pevent, &s, cpu, record->data, record->size, record->ts);
trace_seq_do_printf(&s);
trace_seq_destroy(&s);
printf("\n");
free_record(record);
}
static void test_save(struct pevent_record *record, int cpu)
{
if (test_read_at_index++ == test_read_at_copy) {
test_read_at_offset = record->offset;
printf("\nUSING THIS RECORD\n");
}
}
#endif /* TEST_READ_AT */
/* Debug variables for testing tracecmd_set_cpu_at_timestamp */
#define TEST_AT_TIMESTAMP 0
#if TEST_AT_TIMESTAMP
#define DO_TEST
static unsigned long long test_at_timestamp_ts;
static int test_at_timestamp_copy = 100;
static int test_at_timestamp_cpu = -1;
static int test_at_timestamp_index;
static void show_test(struct tracecmd_input *handle)
{
struct pevent *pevent;
struct pevent_record *record;
struct trace_seq s;
int cpu = test_at_timestamp_cpu;
if (!test_at_timestamp_ts) {
printf("\nNO RECORD COPIED\n");
return;
}
pevent = tracecmd_get_pevent(handle);
if (tracecmd_set_cpu_to_timestamp(handle, cpu, test_at_timestamp_ts))
return;
record = tracecmd_read_data(handle, cpu);
printf("\nHERE'S THE COPY RECORD with page %p offset=%p\n",
(void *)(record->offset & ~(page_size - 1)),
(void *)record->offset);
trace_seq_init(&s);
pevent_print_event(pevent, &s, cpu, record->data, record->size, record->ts);
trace_seq_do_printf(&s);
trace_seq_destroy(&s);
printf("\n");
free_record(record);
}
static void test_save(struct pevent_record *record, int cpu)
{
if (test_at_timestamp_index++ == test_at_timestamp_copy) {
test_at_timestamp_ts = record->ts;
test_at_timestamp_cpu = cpu;
printf("\nUSING THIS RECORD page=%p offset=%p\n",
(void *)(record->offset & ~(page_size - 1)),
(void *)record->offset);
}
}
#endif /* TEST_AT_TIMESTAMP */
#define TEST_FIRST_LAST 0
#if TEST_FIRST_LAST
#define DO_TEST
static void show_test(struct tracecmd_input *handle)
{
struct pevent *pevent;
struct pevent_record *record;
struct trace_seq s;
int cpu = 0;
pevent = tracecmd_get_pevent(handle);
record = tracecmd_read_cpu_first(handle, cpu);
if (!record) {
printf("No first record?\n");
return;
}
printf("\nHERE'S THE FIRST RECORD with offset %p\n",
(void *)record->offset);
trace_seq_init(&s);
pevent_print_event(pevent, &s, cpu, record->data, record->size, record->ts);
trace_seq_do_printf(&s);
trace_seq_destroy(&s);
printf("\n");
free_record(record);
record = tracecmd_read_cpu_last(handle, cpu);
if (!record) {
printf("No last record?\n");
return;
}
printf("\nHERE'S THE LAST RECORD with offset %p\n",
(void *)record->offset);
trace_seq_init(&s);
pevent_print_event(pevent, &s, cpu, record->data, record->size, record->ts);
trace_seq_do_printf(&s);
trace_seq_destroy(&s);
printf("\n");
free_record(record);
}
static void test_save(struct pevent_record *record, int cpu)
{
}
#endif /* TEST_FIRST_LAST */
#ifndef DO_TEST
static void show_test(struct tracecmd_input *handle)
{
}
static void test_save(struct pevent_record *record, int cpu)
{
}
#endif
static void add_input(const char *file)
{
struct input_files *item;
item = malloc(sizeof(*item));
if (!item)
die("Failed to allocate for %s", file);
item->file = file;
list_add_tail(&item->list, &input_files);
last_input_file = item;
}
static void add_handle(struct tracecmd_input *handle, const char *file)
{
struct handle_list *item;
item = malloc(sizeof(*item));
if (!item)
die("Failed ot allocate for %s", file);
memset(item, 0, sizeof(*item));
item->handle = handle;
if (file) {
item->file = file + strlen(file);
/* we want just the base name */
while (item->file >= file && *item->file != '/')
item->file--;
item->file++;
if (strlen(item->file) > max_file_size)
max_file_size = strlen(item->file);
}
list_add_tail(&item->list, &handle_list);
}
static void free_inputs(void)
{
struct input_files *item;
while (!list_empty(&input_files)) {
item = container_of(input_files.next, struct input_files, list);
list_del(&item->list);
free(item);
}
}
static void free_handles(void)
{
struct handle_list *item;
while (!list_empty(&handle_list)) {
item = container_of(handle_list.next, struct handle_list, list);
list_del(&item->list);
free(item);
}
}
static void add_filter(const char *filter, int neg)
{
struct filter_str *ftr;
ftr = malloc(sizeof(*ftr));
if (!ftr)
die("Failed to allocate for filter %s", filter);
ftr->filter = strdup(filter);
if (!ftr->filter)
die("malloc");
ftr->next = NULL;
ftr->neg = neg;
/* must maintain order of command line */
*filter_next = ftr;
filter_next = &ftr->next;
}
static void __add_filter(struct pid_list **head, const char *arg)
{
struct pid_list *list;
char *pids = strdup(arg);
char *pid;
char *sav;
int free = 1;
if (!pids)
die("malloc");
pid = strtok_r(pids, ",", &sav);
while (pid) {
list = malloc(sizeof(*list));
if (!list)
die("Failed to allocate for arg %s", arg);
list->pid = pid;
list->free = free;
list->next = *head;
*head = list;
/* The first pid needs to be freed */
free = 0;
pid = strtok_r(NULL, ",", &sav);
}
}
static void add_comm_filter(const char *arg)
{
__add_filter(&comm_list, arg);
}
static void add_pid_filter(const char *arg)
{
__add_filter(&pid_list, arg);
}
static char *append_pid_filter(char *curr_filter, char *pid)
{
char *filter;
int len;
#define FILTER_FMT "(common_pid==" __STR ")||(pid==" __STR ")||(next_pid==" __STR ")"
#undef __STR
#define __STR ""
/* strlen(".*:") > strlen("||") */
len = strlen(".*:" FILTER_FMT) + strlen(pid) * 3 + 1;
#undef __STR
#define __STR "%s"
if (!curr_filter) {
filter = malloc(len);
if (!filter)
die("Failed to allocate for filter %s", curr_filter);
sprintf(filter, ".*:" FILTER_FMT, pid, pid, pid);
} else {
len += strlen(curr_filter);
filter = realloc(curr_filter, len);
if (!filter)
die("realloc");
sprintf(filter, "%s||" FILTER_FMT, filter, pid, pid, pid);
}
return filter;
}
static void convert_comm_filter(struct tracecmd_input *handle)
{
struct pevent *pevent;
struct pid_list *list;
struct cmdline *cmdline;
char pidstr[100];
if (!comm_list)
return;
pevent = tracecmd_get_pevent(handle);
/* Seach for comm names and get their pids */
for (list = comm_list; list; list = list->next) {
cmdline = pevent_data_pid_from_comm(pevent, list->pid, NULL);
if (!cmdline) {
warning("comm: %s not in cmdline list", list->pid);
continue;
}
do {
sprintf(pidstr, "%d", pevent_cmdline_pid(pevent, cmdline));
add_pid_filter(pidstr);
cmdline = pevent_data_pid_from_comm(pevent, list->pid,
cmdline);
} while (cmdline);
}
while (comm_list) {
list = comm_list;
comm_list = comm_list->next;
if (list->free)
free(list->pid);
free(list);
}
}
static void make_pid_filter(struct tracecmd_input *handle)
{
struct pid_list *list;
char *str = NULL;
convert_comm_filter(handle);
if (!pid_list)
return;
/* First do all common pids */
for (list = pid_list; list; list = list->next) {
str = append_pid_filter(str, list->pid);
}
add_filter(str, 0);
free(str);
while (pid_list) {
list = pid_list;
pid_list = pid_list->next;
if (list->free)
free(list->pid);
free(list);
}
}
static void process_filters(struct handle_list *handles)
{
struct filter **filter_next = &handles->event_filters;
struct filter **filter_out_next = &handles->event_filter_out;
struct filter *event_filter;
struct filter_str *filter;
struct pevent *pevent;
char errstr[200];
int ret;
pevent = tracecmd_get_pevent(handles->handle);
make_pid_filter(handles->handle);
while (filter_strings) {
filter = filter_strings;
filter_strings = filter->next;
event_filter = malloc(sizeof(*event_filter));
if (!event_filter)
die("Failed to allocate for event filter");
event_filter->next = NULL;
event_filter->filter = pevent_filter_alloc(pevent);
if (!event_filter->filter)
die("malloc");
ret = pevent_filter_add_filter_str(event_filter->filter,
filter->filter);
if (ret < 0) {
pevent_strerror(pevent, ret, errstr, sizeof(errstr));
die("Error filtering: %s\n%s",
filter->filter, errstr);
}
if (filter->neg) {
*filter_out_next = event_filter;
filter_out_next = &event_filter->next;
} else {
*filter_next = event_filter;
filter_next = &event_filter->next;
}
free(filter->filter);
free(filter);
}
}
static void init_wakeup(struct tracecmd_input *handle)
{
struct event_format *event;
struct pevent *pevent;
if (!show_wakeup)
return;
pevent = tracecmd_get_pevent(handle);
trace_hash_init(&wakeup_hash, WAKEUP_HASH_SIZE);
event = pevent_find_event_by_name(pevent, "sched", "sched_wakeup");
if (!event)
goto fail;
wakeup_id = event->id;
wakeup_task = pevent_find_field(event, "pid");
if (!wakeup_task)
goto fail;
wakeup_success = pevent_find_field(event, "success");
event = pevent_find_event_by_name(pevent, "sched", "sched_switch");
if (!event)
goto fail;
sched_id = event->id;
sched_task = pevent_find_field(event, "next_pid");
if (!sched_task)
goto fail;
sched_prio = pevent_find_field(event, "next_prio");
if (!sched_prio)
goto fail;
wakeup_new_id = -1;
event = pevent_find_event_by_name(pevent, "sched", "sched_wakeup_new");
if (!event)
goto skip;
wakeup_new_id = event->id;
wakeup_new_task = pevent_find_field(event, "pid");
if (!wakeup_new_task)
goto fail;
wakeup_new_success = pevent_find_field(event, "success");
skip:
return;
fail:
show_wakeup = 0;
}
static void add_wakeup(unsigned int val, unsigned long long start)
{
unsigned int key = trace_hash(val);
struct wakeup_info *info;
struct trace_hash_item *item;
item = trace_hash_find(&wakeup_hash, key, NULL, NULL);
if (item) {
info = container_of(item, struct wakeup_info, hash);
/* Hmm, double wakeup? */
info->start = start;
return;
}
info = malloc(sizeof(*info));
if (!info)
die("Failed to allocate wakeup info");
info->hash.key = val;
info->start = start;
trace_hash_add(&wakeup_hash, &info->hash);
}
static unsigned long long max_lat = 0;
static unsigned long long max_time;
static unsigned long long min_lat = -1;
static unsigned long long min_time;
static unsigned long long max_rt_lat = 0;
static unsigned long long max_rt_time;
static unsigned long long min_rt_lat = -1;
static unsigned long long min_rt_time;
static void add_sched(unsigned int val, unsigned long long end, int rt)
{
struct trace_hash_item *item;
unsigned int key = trace_hash(val);
struct wakeup_info *info;
unsigned long long cal;
item = trace_hash_find(&wakeup_hash, key, NULL, NULL);
if (!item)
return;
info = container_of(item, struct wakeup_info, hash);
cal = end - info->start;
if (cal > max_lat) {
max_lat = cal;
max_time = end;
}
if (cal < min_lat) {
min_lat = cal;
min_time = end;
}
if (rt) {
if (cal > max_rt_lat) {
max_rt_lat = cal;
max_rt_time = end;
}
if (cal < min_rt_lat) {
min_rt_lat = cal;
min_rt_time = end;
}
}
printf(" Latency: %llu.%03llu usecs", cal / 1000, cal % 1000);
total_wakeup_lat += cal;
wakeup_lat_count++;
if (rt) {
total_wakeup_rt_lat += cal;
wakeup_rt_lat_count++;
}
trace_hash_del(item);
free(info);
}
static void process_wakeup(struct pevent *pevent, struct pevent_record *record)
{
unsigned long long val;
int id;
if (!show_wakeup)
return;
id = pevent_data_type(pevent, record);
if (id == wakeup_id) {
if (pevent_read_number_field(wakeup_success, record->data, &val) == 0) {
if (!val)
return;
}
if (pevent_read_number_field(wakeup_task, record->data, &val))
return;
add_wakeup(val, record->ts);
} else if (id == wakeup_new_id) {
if (pevent_read_number_field(wakeup_new_success, record->data, &val) == 0) {
if (!val)
return;
}
if (pevent_read_number_field(wakeup_new_task, record->data, &val))
return;
add_wakeup(val, record->ts);
} else if (id == sched_id) {
int rt = 1;
if (pevent_read_number_field(sched_prio, record->data, &val))
return;
if (val > 99)
rt = 0;
if (pevent_read_number_field(sched_task, record->data, &val))
return;
add_sched(val, record->ts, rt);
}
}
static void
show_wakeup_timings(unsigned long long total, unsigned long count,
unsigned long long lat_max, unsigned long long time_max,
unsigned long long lat_min, unsigned long long time_min)
{
total /= count;
printf("\nAverage wakeup latency: %llu.%03llu usecs\n",
total / 1000,
total % 1000);
printf("Maximum Latency: %llu.%03llu usecs at ", lat_max / 1000, lat_max % 1000);
printf("timestamp: %llu.%06llu\n",
time_max / 1000000000, ((time_max + 500) % 1000000000) / 1000);
printf("Minimum Latency: %llu.%03llu usecs at ", lat_min / 1000, lat_min % 1000);
printf("timestamp: %llu.%06llu\n\n", time_min / 1000000000,
((time_min + 500) % 1000000000) / 1000);
}
static void finish_wakeup(void)
{
struct wakeup_info *info;
struct trace_hash_item **bucket;
struct trace_hash_item *item;
if (!show_wakeup || !wakeup_lat_count)
return;
show_wakeup_timings(total_wakeup_lat, wakeup_lat_count,
max_lat, max_time,
min_lat, min_time);
if (wakeup_rt_lat_count) {
printf("RT task timings:\n");
show_wakeup_timings(total_wakeup_rt_lat, wakeup_rt_lat_count,
max_rt_lat, max_rt_time,
min_rt_lat, min_rt_time);
}
trace_hash_for_each_bucket(bucket, &wakeup_hash) {
trace_hash_while_item(item, bucket) {
trace_hash_del(item);
info = container_of(item, struct wakeup_info, hash);
free(info);
}
}
trace_hash_free(&wakeup_hash);
}
void trace_show_data(struct tracecmd_input *handle, struct pevent_record *record,
int profile)
{
struct pevent *pevent;
struct trace_seq s;
int cpu = record->cpu;
bool use_trace_clock;
static unsigned long long last_ts;
unsigned long long diff_ts;
char buf[50];
pevent = tracecmd_get_pevent(handle);
test_save(record, cpu);
if (profile) {
trace_profile_record(handle, record, cpu);
return;
}
trace_seq_init(&s);
if (record->missed_events > 0)
trace_seq_printf(&s, "CPU:%d [%lld EVENTS DROPPED]\n",
cpu, record->missed_events);
else if (record->missed_events < 0)
trace_seq_printf(&s, "CPU:%d [EVENTS DROPPED]\n", cpu);
if (buffer_breaks || debug) {
if (tracecmd_record_at_buffer_start(handle, record)) {
trace_seq_printf(&s, "CPU:%d [SUBBUFFER START]", cpu);
if (debug)
trace_seq_printf(&s, " [%lld]",
tracecmd_page_ts(handle, record));
trace_seq_putc(&s, '\n');
}
}
use_trace_clock = tracecmd_get_use_trace_clock(handle);
if (tsdiff) {
struct event_format *event;
unsigned long long rec_ts = record->ts;
event = pevent_find_event_by_record(pevent, record);
pevent_print_event_task(pevent, &s, event, record);
pevent_print_event_time(pevent, &s, event, record,
use_trace_clock);
buf[0] = 0;
if (use_trace_clock && !(pevent->flags & PEVENT_NSEC_OUTPUT))
rec_ts = (rec_ts + 500) / 1000;
if (last_ts) {
diff_ts = rec_ts - last_ts;
snprintf(buf, 50, "(+%lld)", diff_ts);
buf[49] = 0;
}
last_ts = rec_ts;
trace_seq_printf(&s, " %-8s", buf);
pevent_print_event_data(pevent, &s, event, record);
} else
pevent_print_event(pevent, &s, record, use_trace_clock);
if (s.len && *(s.buffer + s.len - 1) == '\n')
s.len--;
if (debug) {
struct kbuffer *kbuf;
struct kbuffer_raw_info info;
void *page;
void *offset;
trace_seq_printf(&s, " [%d]",
tracecmd_record_ts_delta(handle, record));
kbuf = tracecmd_record_kbuf(handle, record);
page = tracecmd_record_page(handle, record);
offset = tracecmd_record_offset(handle, record);
if (kbuf && page && offset) {
struct kbuffer_raw_info *pi = &info;
/* We need to get the record raw data to get next */
pi->next = offset;
pi = kbuffer_raw_get(kbuf, page, pi);
while ((pi = kbuffer_raw_get(kbuf, page, pi))) {
if (pi->type < KBUFFER_TYPE_PADDING)
break;
switch (pi->type) {
case KBUFFER_TYPE_PADDING:
trace_seq_printf(&s, "\n PADDING: ");
break;
case KBUFFER_TYPE_TIME_EXTEND:
trace_seq_printf(&s, "\n TIME EXTEND: ");
break;
case KBUFFER_TYPE_TIME_STAMP:
trace_seq_printf(&s, "\n TIME STAMP?: ");
break;
}
trace_seq_printf(&s, "delta:%lld length:%d",
pi->delta,
pi->length);
}
}
}
trace_seq_do_printf(&s);
trace_seq_destroy(&s);
process_wakeup(pevent, record);
printf("\n");
}
static void read_rest(void)
{
char buf[BUFSIZ + 1];
int r;
do {
r = read(input_fd, buf, BUFSIZ);
if (r > 0) {
buf[r] = 0;
printf("%s", buf);
}
} while (r > 0);
}
static int
test_filters(struct pevent *pevent, struct filter *event_filters,
struct pevent_record *record, int neg)
{
int found = 0;
int ret = FILTER_NONE;
int flags;
if (no_irqs || no_softirqs) {
flags = pevent_data_flags(pevent, record);
if (no_irqs && (flags & TRACE_FLAG_HARDIRQ))
return FILTER_MISS;
if (no_softirqs && (flags & TRACE_FLAG_SOFTIRQ))
return FILTER_MISS;
}
while (event_filters) {
ret = pevent_filter_match(event_filters->filter, record);
switch (ret) {
case FILTER_NONE:
case FILTER_MATCH:
found = 1;
}
/* We need to test all negative filters */
if (!neg && found)
break;
event_filters = event_filters->next;
}
return ret;
}
struct stack_info_cpu {
int cpu;
int last_printed;
};
struct stack_info {
struct stack_info *next;
struct handle_list *handles;
struct stack_info_cpu *cpus;
int stacktrace_id;
int nr_cpus;
};
static int
test_stacktrace(struct handle_list *handles, struct pevent_record *record,
int last_printed)
{
static struct stack_info *infos;
struct stack_info *info;
struct stack_info_cpu *cpu_info;
struct handle_list *h;
struct tracecmd_input *handle;
struct event_format *event;
struct pevent *pevent;
static int init;
int ret;
int id;
if (!init) {
init = 1;
list_for_each_entry(h, &handle_list, list) {
info = malloc(sizeof(*info));
if (!info)
die("Failed to allocate handle");
info->handles = h;
info->nr_cpus = tracecmd_cpus(h->handle);
info->cpus = malloc(sizeof(*info->cpus) * info->nr_cpus);
if (!info->cpus)
die("Failed to allocate for %d cpus", info->nr_cpus);
memset(info->cpus, 0, sizeof(*info->cpus));
pevent = tracecmd_get_pevent(h->handle);
event = pevent_find_event_by_name(pevent, "ftrace",
"kernel_stack");
if (event)
info->stacktrace_id = event->id;
else
info->stacktrace_id = 0;
info->next = infos;
infos = info;
}
}
handle = handles->handle;
pevent = tracecmd_get_pevent(handle);
for (info = infos; info; info = info->next)
if (info->handles == handles)
break;
if (!info->stacktrace_id)
return 0;
cpu_info = &info->cpus[record->cpu];
id = pevent_data_type(pevent, record);
/*
* Print the stack trace if the previous event was printed.
* But do not print the stack trace if it is explicitly
* being filtered out.
*/
if (id == info->stacktrace_id) {
ret = test_filters(pevent, handles->event_filter_out, record, 1);
if (ret != FILTER_MATCH)
return cpu_info->last_printed;
return 0;
}