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trace.c
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trace.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <monitor.h>
#include <dlfcn.h>
#include <tep.h>
#include <trace_helpers.h>
#include <stack_helpers.h>
static profiler trace;
static struct monitor_ctx {
struct perf_evlist *evlist;
struct callchain_ctx *cc;
struct flame_graph *flame;
struct tp_list *tp_list;
time_t time;
char time_str[32];
struct env *env;
} ctx;
static void trace_interval(void);
static int monitor_ctx_init(struct env *env)
{
if (!env->event)
return -1;
tep__ref();
ctx.tp_list = tp_list_new(env->event);
if (!ctx.tp_list)
return -1;
ctx.time = 0;
ctx.time_str[0] = '\0';
if (env->callchain || ctx.tp_list->nr_need_stack) {
if (!env->flame_graph)
ctx.cc = callchain_ctx_new(callchain_flags(CALLCHAIN_KERNEL | CALLCHAIN_USER), stdout);
else {
ctx.flame = flame_graph_open(callchain_flags(CALLCHAIN_KERNEL | CALLCHAIN_USER), env->flame_graph);
if (env->interval) {
trace_interval();
trace.interval = trace_interval;
}
}
trace.pages *= 2;
}
ctx.env = env;
return 0;
}
static void monitor_ctx_exit(void)
{
if (ctx.env->callchain || ctx.tp_list->nr_need_stack) {
if (!ctx.env->flame_graph)
callchain_ctx_free(ctx.cc);
else {
flame_graph_output(ctx.flame);
flame_graph_close(ctx.flame);
}
}
tp_list_free(ctx.tp_list);
tep__unref();
}
static int trace_init(struct perf_evlist *evlist, struct env *env)
{
struct perf_event_attr attr = {
.type = PERF_TYPE_TRACEPOINT,
.config = 0,
.size = sizeof(struct perf_event_attr),
.sample_period = 1,
.sample_type = PERF_SAMPLE_TID | PERF_SAMPLE_TIME | PERF_SAMPLE_STREAM_ID | PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD |
PERF_SAMPLE_RAW | (env->callchain ? PERF_SAMPLE_CALLCHAIN : 0),
.read_format = PERF_FORMAT_ID,
.pinned = 1,
.disabled = 1,
.exclude_callchain_user = exclude_callchain_user(CALLCHAIN_KERNEL | CALLCHAIN_USER),
.exclude_callchain_kernel = exclude_callchain_kernel(CALLCHAIN_KERNEL | CALLCHAIN_USER),
.wakeup_events = 1,
};
struct perf_evsel *evsel;
int i;
if (monitor_ctx_init(env) < 0)
return -1;
if (ctx.tp_list->nr_tp == ctx.tp_list->nr_push_to) {
attr.watermark = 1;
attr.wakeup_watermark = (trace.pages << 12) / 2;
}
if (env->overwrite) {
attr.write_backward = 1,
attr.watermark = 1,
attr.wakeup_watermark = trace.pages;
} else
reduce_wakeup_times(&trace, &attr);
for (i = 0; i < ctx.tp_list->nr_tp; i++) {
struct tp *tp = &ctx.tp_list->tp[i];
attr.config = tp->id;
if (!env->callchain) {
if (tp->stack)
attr.sample_type |= PERF_SAMPLE_CALLCHAIN;
else
attr.sample_type &= (~PERF_SAMPLE_CALLCHAIN);
}
attr.sample_max_stack = tp->max_stack;
evsel = perf_evsel__new(&attr);
if (!evsel) {
return -1;
}
perf_evlist__add(evlist, evsel);
if (!tp_kernel(tp))
perf_evsel__keep_disable(evsel, true);
tp->evsel = evsel;
}
ctx.evlist = evlist;
return 0;
}
static int trace_filter(struct perf_evlist *evlist, struct env *env)
{
int i, err;
for (i = 0; i < ctx.tp_list->nr_tp; i++) {
struct tp *tp = &ctx.tp_list->tp[i];
if (tp->filter && tp->filter[0]) {
err = perf_evsel__apply_filter(tp->evsel, tp->filter);
if (err < 0)
return err;
}
}
return 0;
}
static void trace_exit(struct perf_evlist *evlist)
{
monitor_ctx_exit();
}
// in linux/perf_event.h
// PERF_SAMPLE_TID | PERF_SAMPLE_TIME | PERF_SAMPLE_STREAM_ID | PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD | PERF_SAMPLE_RAW
struct sample_type_header {
struct {
__u32 pid;
__u32 tid;
} tid_entry;
__u64 time;
__u64 stream_id;
struct {
__u32 cpu;
__u32 reserved;
} cpu_entry;
__u64 period;
};
struct sample_type_callchain {
struct sample_type_header h;
struct callchain callchain;
};
struct sample_type_raw {
struct sample_type_header h;
struct {
__u32 size;
__u8 data[0];
} raw;
};
static void __raw_size(union perf_event *event, void **praw, int *psize, bool callchain)
{
if (callchain) {
struct sample_type_callchain *data = (void *)event->sample.array;
struct {
__u32 size;
__u8 data[0];
} *raw = (void *)data->callchain.ips + data->callchain.nr * sizeof(__u64);
*praw = raw->data;
*psize = raw->size;
} else {
struct sample_type_raw *raw = (void *)event->sample.array;
*praw = raw->raw.data;
*psize = raw->raw.size;
}
}
static inline void __print_callchain(union perf_event *event, bool callchain)
{
struct sample_type_callchain *data = (void *)event->sample.array;
if (callchain) {
if (!ctx.env->flame_graph)
print_callchain_common(ctx.cc, &data->callchain, data->h.tid_entry.pid);
else {
const char *comm = tep__pid_to_comm((int)data->h.tid_entry.pid);
flame_graph_add_callchain_at_time(ctx.flame, &data->callchain, data->h.tid_entry.pid,
!strcmp(comm, "<...>") ? NULL : comm,
ctx.time, ctx.time_str);
}
}
}
static inline bool have_callchain(union perf_event *event, struct perf_evsel *evsel)
{
if (ctx.env->callchain)
return true;
if (ctx.tp_list->nr_need_stack == ctx.tp_list->nr_tp)
return true;
if (ctx.tp_list->need_stream_id) {
struct sample_type_header *data = (void *)event->sample.array;
if (!evsel) {
evsel = perf_evlist__id_to_evsel(ctx.evlist, data->stream_id, NULL);
if (!evsel) {
fprintf(stderr, "Can't find evsel, please set read_format = PERF_FORMAT_ID\n");
exit(1);
}
}
return !!(perf_evsel__attr(evsel)->sample_type & PERF_SAMPLE_CALLCHAIN);
}
return false;
}
static void trace_sample(union perf_event *event, int instance)
{
struct sample_type_header *data = (void *)event->sample.array;
struct perf_evsel *evsel = NULL;
struct tp *tp = NULL;
void *raw;
int size;
bool callchain;
if (ctx.tp_list->nr_push_to || ctx.tp_list->nr_pull_from) {
int i;
evsel = perf_evlist__id_to_evsel(ctx.evlist, data->stream_id, NULL);
for (i = 0; i < ctx.tp_list->nr_tp; i++) {
tp = &ctx.tp_list->tp[i];
if (tp->evsel == evsel) {
if (tp_broadcast_event(tp, event)) return;
else break;
}
}
}
callchain = have_callchain(event, evsel);
__raw_size(event, &raw, &size, callchain);
tep__update_comm(NULL, data->tid_entry.tid);
print_time(stdout);
tp_print_marker(tp);
tep__print_event(data->time/1000, data->cpu_entry.cpu, raw, size);
__print_callchain(event, callchain);
}
static void trace_interval(void)
{
ctx.time = time(NULL);
strftime(ctx.time_str, sizeof(ctx.time_str), "%Y-%m-%d;%H:%M:%S", localtime(&ctx.time));
flame_graph_output(ctx.flame);
flame_graph_reset(ctx.flame);
}
static void trace_help(struct help_ctx *hctx)
{
int i, j;
struct env *env = hctx->env;
printf(PROGRAME " %s ", trace.name);
printf("-e \"");
for (i = 0; i < hctx->nr_list; i++) {
for (j = 0; j < hctx->tp_list[i]->nr_tp; j++) {
struct tp *tp = &hctx->tp_list[i]->tp[j];
printf("%s:%s/%s/", tp->sys, tp->name, tp->filter&&tp->filter[0]?tp->filter:".");
if (!env->callchain)
printf("[stack/]");
if (i != hctx->nr_list - 1 ||
j != hctx->tp_list[i]->nr_tp - 1)
printf(",");
}
}
printf("\" ");
if (env->callchain)
printf("-g ");
if (env->flame_graph)
printf("--flame-graph %s ", env->flame_graph);
common_help(hctx, true, true, true, true, true, true, false);
if (!env->callchain)
printf("[-g] ");
if (!env->flame_graph)
printf("[--flame-graph .] ");
common_help(hctx, false, true, true, true, true, true, false);
printf("\n");
}
static const char *trace_desc[] = PROFILER_DESC("trace",
"[OPTION...] -e EVENT [--overwrite] [-g [--flame-graph file [-i INT]]]",
"Trace events and print them directly.", "",
"EXAMPLES", "",
" "PROGRAME" trace -e sched:sched_wakeup -C 0 -g",
" "PROGRAME" trace -e sched:sched_wakeup,sched:sched_switch --overwrite");
static const char *trace_argv[] = PROFILER_ARGV("trace",
PROFILER_ARGV_OPTION,
PROFILER_ARGV_CALLCHAIN_FILTER,
PROFILER_ARGV_PROFILER, "event", "overwrite", "call-graph", "flame-graph");
static profiler trace = {
.name = "trace",
.desc = trace_desc,
.argv = trace_argv,
.pages = 2,
.help = trace_help,
.init = trace_init,
.filter = trace_filter,
.deinit = trace_exit,
.sample = trace_sample,
};
PROFILER_REGISTER(trace)