#define _FILE_OFFSET_BITS 64
#include <linux/kernel.h>
#include <byteswap.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>
#include "evlist.h"
#include "evsel.h"
#include "session.h"
#include "sort.h"
#include "util.h"
static int perf_session__open(struct perf_session *self, bool force)
{
struct stat input_stat;
if (!strcmp(self->filename, "-")) {
self->fd_pipe = true;
self->fd = STDIN_FILENO;
if (perf_session__read_header(self, self->fd) < 0)
pr_err("incompatible file format");
return 0;
}
self->fd = open(self->filename, O_RDONLY);
if (self->fd < 0) {
int err = errno;
pr_err("failed to open %s: %s", self->filename, strerror(err));
if (err == ENOENT && !strcmp(self->filename, "perf.data"))
pr_err(" (try 'perf record' first)");
pr_err("\n");
return -errno;
}
if (fstat(self->fd, &input_stat) < 0)
goto out_close;
if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
pr_err("file %s not owned by current user or root\n",
self->filename);
goto out_close;
}
if (!input_stat.st_size) {
pr_info("zero-sized file (%s), nothing to do!\n",
self->filename);
goto out_close;
}
if (perf_session__read_header(self, self->fd) < 0) {
pr_err("incompatible file format");
goto out_close;
}
self->size = input_stat.st_size;
return 0;
out_close:
close(self->fd);
self->fd = -1;
return -1;
}
static void perf_session__id_header_size(struct perf_session *session)
{
struct perf_sample *data;
u64 sample_type = session->sample_type;
u16 size = 0;
if (!session->sample_id_all)
goto out;
if (sample_type & PERF_SAMPLE_TID)
size += sizeof(data->tid) * 2;
if (sample_type & PERF_SAMPLE_TIME)
size += sizeof(data->time);
if (sample_type & PERF_SAMPLE_ID)
size += sizeof(data->id);
if (sample_type & PERF_SAMPLE_STREAM_ID)
size += sizeof(data->stream_id);
if (sample_type & PERF_SAMPLE_CPU)
size += sizeof(data->cpu) * 2;
out:
session->id_hdr_size = size;
}
void perf_session__update_sample_type(struct perf_session *self)
{
self->sample_type = perf_evlist__sample_type(self->evlist);
self->sample_id_all = perf_evlist__sample_id_all(self->evlist);
perf_session__id_header_size(self);
}
int perf_session__create_kernel_maps(struct perf_session *self)
{
int ret = machine__create_kernel_maps(&self->host_machine);
if (ret >= 0)
ret = machines__create_guest_kernel_maps(&self->machines);
return ret;
}
static void perf_session__destroy_kernel_maps(struct perf_session *self)
{
machine__destroy_kernel_maps(&self->host_machine);
machines__destroy_guest_kernel_maps(&self->machines);
}
struct perf_session *perf_session__new(const char *filename, int mode,
bool force, bool repipe,
struct perf_event_ops *ops)
{
size_t len = filename ? strlen(filename) + 1 : 0;
struct perf_session *self = zalloc(sizeof(*self) + len);
if (self == NULL)
goto out;
memcpy(self->filename, filename, len);
self->threads = RB_ROOT;
INIT_LIST_HEAD(&self->dead_threads);
self->last_match = NULL;
/*
* On 64bit we can mmap the data file in one go. No need for tiny mmap
* slices. On 32bit we use 32MB.
*/
#if BITS_PER_LONG == 64
self->mmap_window = ULLONG_MAX;
#else
self->mmap_window = 32 * 1024 * 1024ULL;
#endif
self->machines = RB_ROOT;
self->repipe = repipe;
INIT_LIST_HEAD(&self->ordered_samples.samples);
INIT_LIST_HEAD(&self->ordered_samples.sample_cache);
INIT_LIST_HEAD(&self->ordered_samples.to_free);
machine__init(&self->host_machine, "", HOST_KERNEL_ID);
if (mode == O_RDONLY) {
if (perf_session__open(self, force) < 0)
goto out_delete;
perf_session__update_sample_type(self);
} else if (mode == O_WRONLY) {
/*
* In O_RDONLY mode this will be performed when reading the
* kernel MMAP event, in perf_event__process_mmap().
*/
if (perf_session__create_kernel_maps(self) < 0)
goto out_delete;
}
if (ops && ops->ordering_requires_timestamps &&
ops->ordered_samples && !self->sample_id_all) {
dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
ops->ordered_samples = false;
}
out:
return self;
out_delete:
perf_session__delete(self);
return NULL;
}
static void perf_session__delete_dead_threads(struct perf_session *self)
{
struct thread *n, *t;
list_for_each_entry_safe(t, n, &self->dead_threads, node) {
list_del(&t->node);
thread__delete(t);
}
}
static void perf_session__delete_threads(struct perf_session *self)
{
struct rb_node *nd = rb_first(&self->threads);
while (nd) {
struct thread *t = rb_entry(nd, struct thread, rb_node);
rb_erase(&t->rb_node, &self->threads);
nd = rb_next(nd);
thread__delete(t);
}
}
void perf_session__delete(struct perf_session *self)
{
perf_session__destroy_kernel_maps(self);
perf_session__delete_dead_threads(self);
perf_session__delete_threads(self);
machine__exit(&self->host_machine);
close(self->fd);
free(self);
}
void perf_session__remove_thread(struct perf_session *self, struct thread *th)
{
self->last_match = NULL;
rb_erase(&th->rb_node, &self->threads);
/*
* We may have references to this thread, for instance in some hist_entry
* instances, so just move them to a separate list.
*/
list_add_tail(&th->node, &self->dead_threads);
}
static bool symbol__match_parent_regex(struct symbol *sym)
{
if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
return 1;
return 0;
}
int perf_session__resolve_callchain(struct perf_session *self,
struct thread *thread,
struct ip_callchain *chain,
struct symbol **parent)
{
u8 cpumode = PERF_RECORD_MISC_USER;
unsigned int i;
int err;
callchain_cursor_reset(&self->callchain_cursor);
for (i = 0; i < chain->nr; i++) {
u64 ip = chain->ips[i];
struct addr_location al;
if (ip >= PERF_CONTEXT_MAX) {
switch (ip) {
case PERF_CONTEXT_HV:
cpumode = PERF_RECORD_MISC_HYPERVISOR; break;
case PERF_CONTEXT_KERNEL:
cpumode = PERF_RECORD_MISC_KERNEL; break;
case PERF_CONTEXT_USER:
cpumode = PERF_RECORD_MISC_USER; break;
default:
break;
}
continue;
}
al.filtered = false;
thread__find_addr_location(thread, self, cpumode,
MAP__FUNCTION, thread->pid, ip, &al, NULL);
if (al.sym != NULL) {
if (sort__has_parent && !*parent &&
symbol__match_parent_regex(al.sym))
*parent = al.sym;
if (!symbol_conf.use_callchain)
break;
}
err = callchain_cursor_append(&self->callchain_cursor,
ip, al.map, al.sym);
if (err)
return err;
}
return 0;
}
static int process_event_synth_stub(union perf_event *event __used,
struct perf_session *session __used)
{
dump_printf(": unhandled!\n");
return 0;
}
static int process_event_sample_stub(union perf_event *event __used,
struct perf_sample *sample __used,
struct perf_evsel *evsel __used,
struct perf_session *session __used)
{
dump_printf(": unhandled!\n");
return 0;
}
static int process_event_stub(union perf_event *event __used,
struct perf_sample *sample __used,
struct perf_session *session __used)
{
dump_printf(": unhandled!\n");
return 0;
}
static int process_finished_round_stub(union perf_event *event __used,
struct perf_session *session __used,
struct perf_event_ops *ops __used)
{
dump_printf(": unhandled!\n");
return 0;
}
static int process_finished_round(union perf_event *event,
struct perf_session *session,
struct perf_event_ops *ops);
static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
{
if (handler->sample == NULL)
handler->sample = process_event_sample_stub;
if (handler->mmap == NULL)
handler->mmap = process_event_stub;
if (handler->comm == NULL)
handler->comm = process_event_stub;
if (handler->fork == NULL)
handler->fork = process_event_stub;
if (handler->exit == NULL)
handler->exit = process_event_stub;
if (handler->lost == NULL)
handler->lost = perf_event__process_lost;
if (handler->read == NULL)
handler->read = process_event_stub;
if (handler->throttle == NULL)
handler->throttle = process_event_stub;
if (handler->unthrottle == NULL)
handler->unthrottle = process_event_stub;
if (handler->attr == NULL)
handler->attr = process_event_synth_stub;
if (handler->event_type == NULL)
handler->event_type = process_event_synth_stub;
if (handler->tracing_data == NULL)
handler->tracing_data = process_event_synth_stub;
if (handler->build_id == NULL)
handler->build_id = process_event_synth_stub;
if (handler->finished_round == NULL) {
if (handler->ordered_samples)
handler->finished_round = process_finished_round;
else
handler->finished_round = process_finished_round_stub;
}
}
void mem_bswap_64(void *src, int byte_size)
{
u64 *m = src;
while (byte_size > 0) {
*m = bswap_64(*m);
byte_size -= sizeof(u64);
++m;
}
}
static void perf_event__all64_swap(union perf_event *event)
{
struct perf_event_header *hdr = &event->header;
mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
}
static void perf_event__comm_swap(union perf_event *event)
{
event->comm.pid = bswap_32(event->comm.pid);
event->comm.tid = bswap_32(event->comm.tid);
}
static void perf_event__mmap_swap(union perf_event *event)
{
event->mmap.pid = bswap_32(event->mmap.pid);
event->mmap.tid = bswap_32(event->mmap.tid);
event->mmap.start = bswap_64(event->mmap.start);
event->mmap.len = bswap_64(event->mmap.len);
event->mmap.pgoff = bswap_64(event->mmap.pgoff);
}
static void perf_event__task_swap(union perf_event *event)
{
event->fork.pid = bswap_32(event->fork.pid);
event->fork.tid = bswap_32(event->fork.tid);
event->fork.ppid = bswap_32(event->fork.ppid);
event->fork.ptid = bswap_32(event->fork.ptid);
event->fork.time = bswap_64(event->fork.time);
}
static void perf_event__read_swap(union perf_event *event)
{
event->read.pid = bswap_32(event->read.pid);
event->read.tid = bswap_32(event->read.tid);
event->read.value = bswap_64(event->read.value);
event->read.time_enabled = bswap_64(event->read.time_enabled);
event->read.time_running = bswap_64(event->read.time_running);
event->read.id = bswap_64(event->read.id);
}
static void perf_event__attr_swap(union perf_event *event)
{
size_t size;
event->attr.attr.type = bswap_32(event->attr.attr.type);
event->attr.attr.size = bswap_32(event->attr.attr.size);
event->attr.attr.config = bswap_64(event->attr.attr.config);
event->attr.attr.sample_period = bswap_64(event->attr.attr.sample_period);
event->attr.attr.sample_type = bswap_64(event->attr.attr.sample_type);
event->attr.attr.read_format = bswap_64(event->attr.attr.read_format);
event->attr.attr.wakeup_events = bswap_32(event->attr.attr.wakeup_events);
event->attr.attr.bp_type = bswap_32(event->attr.attr.bp_type);
event->attr.attr.bp_addr = bswap_64(event->attr.attr.bp_addr);
event->attr.attr.bp_len = bswap_64(event->attr.attr.bp_len);
size = event->header.size;
size -= (void *)&event->attr.id - (void *)event;
mem_bswap_64(event->attr.id, size);
}
static void perf_event__event_type_swap(union perf_event *event)
{
event->event_type.event_type.event_id =
bswap_64(event->event_type.event_type.event_id);
}
static void perf_event__tracing_data_swap(union perf_event *event)
{
event->tracing_data.size = bswap_32(event->tracing_data.size);
}
typedef void (*perf_event__swap_op)(union perf_event *event);
static perf_event__swap_op perf_event__swap_ops[] = {
[PERF_RECORD_MMAP] = perf_event__mmap_swap,
[PERF_RECORD_COMM] = perf_event__comm_swap,
[PERF_RECORD_FORK] = perf_event__task_swap,
[PERF_RECORD_EXIT] = perf_event__task_swap,
[PERF_RECORD_LOST] = perf_event__all64_swap,
[PERF_RECORD_READ] = perf_event__read_swap,
[PERF_RECORD_SAMPLE] = perf_event__all64_swap,
[PERF_RECORD_HEADER_ATTR] = perf_event__attr_swap,
[PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap,
[PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
[PERF_RECORD_HEADER_BUILD_ID] = NULL,
[PERF_RECORD_HEADER_MAX] = NULL,
};
struct sample_queue {
u64 timestamp;
u64 file_offset;
union perf_event *event;
struct list_head list;
};
static void perf_session_free_sample_buffers(struct perf_session *session)
{
struct ordered_samples *os = &session->ordered_samples;
while (!list_empty(&os->to_free)) {
struct sample_queue *sq;
sq = list_entry(os->to_free.next, struct sample_queue, list);
list_del(&sq->list);
free(sq);
}
}
static int perf_session_deliver_event(struct perf_session *session,
union perf_event *event,
struct perf_sample *sample,
struct perf_event_ops *ops,
u64 file_offset);
static void flush_sample_queue(struct perf_session *s,
struct perf_event_ops *ops)
{
struct ordered_samples *os = &s->ordered_samples;
struct list_head *head = &os->samples;
struct sample_queue *tmp, *iter;
struct perf_sample sample;
u64 limit = os->next_flush;
u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL;
if (!ops->ordered_samples || !limit)
return;
list_for_each_entry_safe(iter, tmp, head, list) {
if (iter->timestamp > limit)
break;
perf_session__parse_sample(s, iter->event, &sample);
perf_session_deliver_event(s, iter->event, &sample, ops,
iter->file_offset);
os->last_flush = iter->timestamp;
list_del(&iter->list);
list_add(&iter->list, &os->sample_cache);
}
if (list_empty(head)) {
os->last_sample = NULL;
} else if (last_ts <= limit) {
os->last_sample =
list_entry(head->prev, struct sample_queue, list);
}
}
/*
* When perf record finishes a pass on every buffers, it records this pseudo
* event.
* We record the max timestamp t found in the pass n.
* Assuming these timestamps are monotonic across cpus, we know that if
* a buffer still has events with timestamps below t, they will be all
* available and then read in the pass n + 1.
* Hence when we start to read the pass n + 2, we can safely flush every
* events with timestamps below t.
*
* ============ PASS n =================
* CPU 0 | CPU 1
* |
* cnt1 timestamps | cnt2 timestamps
* 1 | 2
* 2 | 3
* - | 4 <--- max recorded
*
* ============ PASS n + 1 ==============
* CPU 0 | CPU 1
* |
* cnt1 timestamps | cnt2 timestamps
* 3 | 5
* 4 | 6
* 5 | 7 <---- max recorded
*
* Flush every events below timestamp 4
*
* ============ PASS n + 2 ==============
* CPU 0 | CPU 1
* |
* cnt1 timestamps | cnt2 timestamps
* 6 | 8
* 7 | 9
* - | 10
*
* Flush every events below timestamp 7
* etc...
*/
static int process_finished_round(union perf_event *event __used,
struct perf_session *session,
struct perf_event_ops *ops)
{
flush_sample_queue(session, ops);
session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
return 0;
}
/* The queue is ordered by time */
static void __queue_event(struct sample_queue *new, struct perf_session *s)
{
struct ordered_samples *os = &s->ordered_samples;
struct sample_queue *sample = os->last_sample;
u64 timestamp = new->timestamp;
struct list_head *p;
os->last_sample = new;
if (!sample) {
list_add(&new->list, &os->samples);
os->max_timestamp = timestamp;
return;
}
/*
* last_sample might point to some random place in the list as it's
* the last queued event. We expect that the new event is close to
* this.
*/
if (sample->timestamp <= timestamp) {
while (sample->timestamp <= timestamp) {
p = sample->list.next;
if (p == &os->samples) {
list_add_tail(&new->list, &os->samples);
os->max_timestamp = timestamp;
return;
}
sample = list_entry(p, struct sample_queue, list);
}
list_add_tail(&new->list, &sample->list);
} else {
while (sample->timestamp > timestamp) {
p = sample->list.prev;
if (p == &os->samples) {
list_add(&new->list, &os->samples);
return;
}
sample = list_entry(p, struct sample_queue, list);
}
list_add(&new->list, &sample->list);
}
}
#define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue))
static int perf_session_queue_event(struct perf_session *s, union perf_event *event,
struct perf_sample *sample, u64 file_offset)
{
struct ordered_samples *os = &s->ordered_samples;
struct list_head *sc = &os->sample_cache;
u64 timestamp = sample->time;
struct sample_queue *new;
if (!timestamp || timestamp == ~0ULL)
return -ETIME;
if (timestamp < s->ordered_samples.last_flush) {
printf("Warning: Timestamp below last timeslice flush\n");
return -EINVAL;
}
if (!list_empty(sc)) {
new = list_entry(sc->next, struct sample_queue, list);
list_del(&new->list);
} else if (os->sample_buffer) {
new = os->sample_buffer + os->sample_buffer_idx;
if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER)
os->sample_buffer = NULL;
} else {
os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new));
if (!os->sample_buffer)
return -ENOMEM;
list_add(&os->sample_buffer->list, &os->to_free);
os->sample_buffer_idx = 2;
new = os->sample_buffer + 1;
}
new->timestamp = timestamp;
new->file_offset = file_offset;
new->event = event;
__queue_event(new, s);
return 0;
}
static void callchain__printf(struct perf_sample *sample)
{
unsigned int i;
printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr);
for (i = 0; i < sample->callchain->nr; i++)
printf("..... %2d: %016" PRIx64 "\n",
i, sample->callchain->ips[i]);
}
static void perf_session__print_tstamp(struct perf_session *session,
union perf_event *event,
struct perf_sample *sample)
{
if (event->header.type != PERF_RECORD_SAMPLE &&
!session->sample_id_all) {
fputs("-1 -1 ", stdout);
return;
}
if ((session->sample_type & PERF_SAMPLE_CPU))
printf("%u ", sample->cpu);
if (session->sample_type & PERF_SAMPLE_TIME)
printf("%" PRIu64 " ", sample->time);
}
static void dump_event(struct perf_session *session, union perf_event *event,
u64 file_offset, struct perf_sample *sample)
{
if (!dump_trace)
return;
printf("\n%#" PRIx64 " [%#x]: event: %d\n",
file_offset, event->header.size, event->header.type);
trace_event(event);
if (sample)
perf_session__print_tstamp(session, event, sample);
printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
event->header.size, perf_event__name(event->header.type));
}
static void dump_sample(struct perf_session *session, union perf_event *event,
struct perf_sample *sample)
{
if (!dump_trace)
return;
printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 "\n",
event->header.misc, sample->pid, sample->tid, sample->ip,
sample->period);
if (session->sample_type & PERF_SAMPLE_CALLCHAIN)
callchain__printf(sample);
}
static int perf_session_deliver_event(struct perf_session *session,
union perf_event *event,
struct perf_sample *sample,
struct perf_event_ops *ops,
u64 file_offset)
{
struct perf_evsel *evsel;
dump_event(session, event, file_offset, sample);
switch (event->header.type) {
case PERF_RECORD_SAMPLE:
dump_sample(session, event, sample);
evsel = perf_evlist__id2evsel(session->evlist, sample->id);
if (evsel == NULL) {
++session->hists.stats.nr_unknown_id;
return -1;
}
return ops->sample(event, sample, evsel, session);
case PERF_RECORD_MMAP:
return ops->mmap(event, sample, session);
case PERF_RECORD_COMM:
return ops->comm(event, sample, session);
case PERF_RECORD_FORK:
return ops->fork(event, sample, session);
case PERF_RECORD_EXIT:
return ops->exit(event, sample, session);
case PERF_RECORD_LOST:
return ops->lost(event, sample, session);
case PERF_RECORD_READ:
return ops->read(event, sample, session);
case PERF_RECORD_THROTTLE:
return ops->throttle(event, sample, session);
case PERF_RECORD_UNTHROTTLE:
return ops->unthrottle(event, sample, session);
default:
++session->hists.stats.nr_unknown_events;
return -1;
}
}
static int perf_session__preprocess_sample(struct perf_session *session,
union perf_event *event, struct perf_sample *sample)
{
if (event->header.type != PERF_RECORD_SAMPLE ||
!(session->sample_type & PERF_SAMPLE_CALLCHAIN))
return 0;
if (!ip_callchain__valid(sample->callchain, event)) {
pr_debug("call-chain problem with event, skipping it.\n");
++session->hists.stats.nr_invalid_chains;
session->hists.stats.total_invalid_chains += sample->period;
return -EINVAL;
}
return 0;
}
static int perf_session__process_user_event(struct perf_session *session, union perf_event *event,
struct perf_event_ops *ops, u64 file_offset)
{
dump_event(session, event, file_offset, NULL);
/* These events are processed right away */
switch (event->header.type) {
case PERF_RECORD_HEADER_ATTR:
return ops->attr(event, session);
case PERF_RECORD_HEADER_EVENT_TYPE:
return ops->event_type(event, session);
case PERF_RECORD_HEADER_TRACING_DATA:
/* setup for reading amidst mmap */
lseek(session->fd, file_offset, SEEK_SET);
return ops->tracing_data(event, session);
case PERF_RECORD_HEADER_BUILD_ID:
return ops->build_id(event, session);
case PERF_RECORD_FINISHED_ROUND:
return ops->finished_round(event, session, ops);
default:
return -EINVAL;
}
}
static int perf_session__process_event(struct perf_session *session,
union perf_event *event,
struct perf_event_ops *ops,
u64 file_offset)
{
struct perf_sample sample;
int ret;
if (session->header.needs_swap &&
perf_event__swap_ops[event->header.type])
perf_event__swap_ops[event->header.type](event);
if (event->header.type >= PERF_RECORD_HEADER_MAX)
return -EINVAL;
hists__inc_nr_events(&session->hists, event->header.type);
if (event->header.type >= PERF_RECORD_USER_TYPE_START)
return perf_session__process_user_event(session, event, ops, file_offset);
/*
* For all kernel events we get the sample data
*/
perf_session__parse_sample(session, event, &sample);
/* Preprocess sample records - precheck callchains */
if (perf_session__preprocess_sample(session, event, &sample))
return 0;
if (ops->ordered_samples) {
ret = perf_session_queue_event(session, event, &sample,
file_offset);
if (ret != -ETIME)
return ret;
}
return perf_session_deliver_event(session, event, &sample, ops,
file_offset);
}
void perf_event_header__bswap(struct perf_event_header *self)
{
self->type = bswap_32(self->type);
self->misc = bswap_16(self->misc);
self->size = bswap_16(self->size);
}
static struct thread *perf_session__register_idle_thread(struct perf_session *self)
{
struct thread *thread = perf_session__findnew(self, 0);
if (thread == NULL || thread__set_comm(thread, "swapper")) {
pr_err("problem inserting idle task.\n");
thread = NULL;
}
return thread;
}
static void perf_session__warn_about_errors(const struct perf_session *session,
const struct perf_event_ops *ops)
{
if (ops->lost == perf_event__process_lost &&
session->hists.stats.total_lost != 0) {
ui__warning("Processed %" PRIu64 " events and LOST %" PRIu64
"!\n\nCheck IO/CPU overload!\n\n",
session->hists.stats.total_period,
session->hists.stats.total_lost);
}
if (session->hists.stats.nr_unknown_events != 0) {
ui__warning("Found %u unknown events!\n\n"
"Is this an older tool processing a perf.data "
"file generated by a more recent tool?\n\n"
"If that is not the case, consider "
"reporting to linux-kernel@vger.kernel.org.\n\n",
session->hists.stats.nr_unknown_events);
}
if (session->hists.stats.nr_unknown_id != 0) {
ui__warning("%u samples with id not present in the header\n",
session->hists.stats.nr_unknown_id);
}
if (session->hists.stats.nr_invalid_chains != 0) {
ui__warning("Found invalid callchains!\n\n"
"%u out of %u events were discarded for this reason.\n\n"
"Consider reporting to linux-kernel@vger.kernel.org.\n\n",
session->hists.stats.nr_invalid_chains,
session->hists.stats.nr_events[PERF_RECORD_SAMPLE]);
}
}
#define session_done() (*(volatile int *)(&session_done))
volatile int session_done;
static int __perf_session__process_pipe_events(struct perf_session *self,
struct perf_event_ops *ops)
{
union perf_event event;
uint32_t size;
int skip = 0;
u64 head;
int err;
void *p;
perf_event_ops__fill_defaults(ops);
head = 0;
more:
err = readn(self->fd, &event, sizeof(struct perf_event_header));
if (err <= 0) {
if (err == 0)
goto done;
pr_err("failed to read event header\n");
goto out_err;
}
if (self->header.needs_swap)
perf_event_header__bswap(&event.header);
size = event.header.size;
if (size == 0)
size = 8;
p = &event;
p += sizeof(struct perf_event_header);
if (size - sizeof(struct perf_event_header)) {
err = readn(self->fd, p, size - sizeof(struct perf_event_header));
if (err <= 0) {
if (err == 0) {
pr_err("unexpected end of event stream\n");
goto done;
}
pr_err("failed to read event data\n");
goto out_err;
}
}
if (size == 0 ||
(skip = perf_session__process_event(self, &event, ops, head)) < 0) {
dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
head, event.header.size, event.header.type);
/*
* assume we lost track of the stream, check alignment, and
* increment a single u64 in the hope to catch on again 'soon'.
*/
if (unlikely(head & 7))
head &= ~7ULL;
size = 8;
}
head += size;
if (skip > 0)
head += skip;
if (!session_done())
goto more;
done:
err = 0;
out_err:
perf_session__warn_about_errors(self, ops);
perf_session_free_sample_buffers(self);
return err;
}
int __perf_session__process_events(struct perf_session *session,
u64 data_offset, u64 data_size,
u64 file_size, struct perf_event_ops *ops)
{
u64 head, page_offset, file_offset, file_pos, progress_next;
int err, mmap_prot, mmap_flags, map_idx = 0;
struct ui_progress *progress;
size_t page_size, mmap_size;
char *buf, *mmaps[8];
union perf_event *event;
uint32_t size;
perf_event_ops__fill_defaults(ops);
page_size = sysconf(_SC_PAGESIZE);
page_offset = page_size * (data_offset / page_size);
file_offset = page_offset;
head = data_offset - page_offset;
if (data_offset + data_size < file_size)
file_size = data_offset + data_size;
progress_next = file_size / 16;
progress = ui_progress__new("Processing events...", file_size);
if (progress == NULL)
return -1;
mmap_size = session->mmap_window;
if (mmap_size > file_size)
mmap_size = file_size;
memset(mmaps, 0, sizeof(mmaps));
mmap_prot = PROT_READ;
mmap_flags = MAP_SHARED;
if (session->header.needs_swap) {
mmap_prot |= PROT_WRITE;
mmap_flags = MAP_PRIVATE;
}
remap:
buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
file_offset);
if (buf == MAP_FAILED) {
pr_err("failed to mmap file\n");
err = -errno;
goto out_err;
}
mmaps[map_idx] = buf;
map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
file_pos = file_offset + head;
more:
/*
* Ensure we have enough space remaining to read
* the size of the event in the headers.
*/
if (head + sizeof(event->header) > mmap_size)
goto remap;
event = (union perf_event *)(buf + head);
if (session->header.needs_swap)
perf_event_header__bswap(&event->header);
size = event->header.size;
if (size == 0)
size = 8;
if (head + event->header.size > mmap_size) {
if (mmaps[map_idx]) {
munmap(mmaps[map_idx], mmap_size);
mmaps[map_idx] = NULL;
}
page_offset = page_size * (head / page_size);
file_offset += page_offset;
head -= page_offset;
goto remap;
}
size = event->header.size;
if (size == 0 ||
perf_session__process_event(session, event, ops, file_pos) < 0) {
dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
file_offset + head, event->header.size,
event->header.type);
/*
* assume we lost track of the stream, check alignment, and
* increment a single u64 in the hope to catch on again 'soon'.
*/
if (unlikely(head & 7))
head &= ~7ULL;
size = 8;
}
head += size;
file_pos += size;
if (file_pos >= progress_next) {
progress_next += file_size / 16;
ui_progress__update(progress, file_pos);
}
if (file_pos < file_size)
goto more;
err = 0;
/* do the final flush for ordered samples */
session->ordered_samples.next_flush = ULLONG_MAX;
flush_sample_queue(session, ops);
out_err:
ui_progress__delete(progress);
perf_session__warn_about_errors(session, ops);
perf_session_free_sample_buffers(session);
return err;
}
int perf_session__process_events(struct perf_session *self,
struct perf_event_ops *ops)
{
int err;
if (perf_session__register_idle_thread(self) == NULL)
return -ENOMEM;
if (!self->fd_pipe)
err = __perf_session__process_events(self,
self->header.data_offset,
self->header.data_size,
self->size, ops);
else
err = __perf_session__process_pipe_events(self, ops);
return err;
}
bool perf_session__has_traces(struct perf_session *self, const char *msg)
{
if (!(self->sample_type & PERF_SAMPLE_RAW)) {
pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
return false;
}
return true;
}
int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps,
const char *symbol_name,
u64 addr)
{
char *bracket;
enum map_type i;
struct ref_reloc_sym *ref;
ref = zalloc(sizeof(struct ref_reloc_sym));
if (ref == NULL)
return -ENOMEM;
ref->name = strdup(symbol_name);
if (ref->name == NULL) {
free(ref);
return -ENOMEM;
}
bracket = strchr(ref->name, ']');
if (bracket)
*bracket = '\0';
ref->addr = addr;
for (i = 0; i < MAP__NR_TYPES; ++i) {
struct kmap *kmap = map__kmap(maps[i]);
kmap->ref_reloc_sym = ref;
}
return 0;
}
size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
{
return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
__dsos__fprintf(&self->host_machine.user_dsos, fp) +
machines__fprintf_dsos(&self->machines, fp);
}
size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
bool with_hits)
{
size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits);
return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits);
}
size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
{
struct perf_evsel *pos;
size_t ret = fprintf(fp, "Aggregated stats:\n");
ret += hists__fprintf_nr_events(&session->hists, fp);
list_for_each_entry(pos, &session->evlist->entries, node) {
ret += fprintf(fp, "%s stats:\n", event_name(pos));
ret += hists__fprintf_nr_events(&pos->hists, fp);
}
return ret;
}
struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
unsigned int type)
{
struct perf_evsel *pos;
list_for_each_entry(pos, &session->evlist->entries, node) {
if (pos->attr.type == type)
return pos;
}
return NULL;
}
void perf_session__print_symbols(union perf_event *event,
struct perf_sample *sample,
struct perf_session *session)
{
struct addr_location al;
const char *symname, *dsoname;
struct callchain_cursor *cursor = &session->callchain_cursor;
struct callchain_cursor_node *node;
if (perf_event__preprocess_sample(event, session, &al, sample,
NULL) < 0) {
error("problem processing %d event, skipping it.\n",
event->header.type);
return;
}
if (symbol_conf.use_callchain && sample->callchain) {
if (perf_session__resolve_callchain(session, al.thread,
sample->callchain, NULL) != 0) {
if (verbose)
error("Failed to resolve callchain. Skipping\n");
return;
}
callchain_cursor_commit(cursor);
while (1) {
node = callchain_cursor_current(cursor);
if (!node)
break;
if (node->sym && node->sym->name)
symname = node->sym->name;
else
symname = "";
if (node->map && node->map->dso && node->map->dso->name)
dsoname = node->map->dso->name;
else
dsoname = "";
printf("\t%16" PRIx64 " %s (%s)\n", node->ip, symname, dsoname);
callchain_cursor_advance(cursor);
}
} else {
if (al.sym && al.sym->name)
symname = al.sym->name;
else
symname = "";
if (al.map && al.map->dso && al.map->dso->name)
dsoname = al.map->dso->name;
else
dsoname = "";
printf("%16" PRIx64 " %s (%s)", al.addr, symname, dsoname);
}
}
