1 files changed, 786 insertions, 21 deletions

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index ce3a6c8abe76..c422cd676313 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1,7 +1,11 @@
+#define _FILE_OFFSET_BITS 64
+
 #include <linux/kernel.h>
 
+#include <byteswap.h>
 #include <unistd.h>
 #include <sys/types.h>
+#include <sys/mman.h>
 
 #include "session.h"
 #include "sort.h"
@@ -11,6 +15,16 @@ 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_header__read(self, self->fd) < 0)
+			pr_err("incompatible file format");
+
+		return 0;
+	}
+
 	self->fd = open(self->filename, O_RDONLY);
 	if (self->fd < 0) {
 		pr_err("failed to open file: %s", self->filename);
@@ -35,7 +49,7 @@ static int perf_session__open(struct perf_session *self, bool force)
 		goto out_close;
 	}
 
-	if (perf_header__read(&self->header, self->fd) < 0) {
+	if (perf_header__read(self, self->fd) < 0) {
 		pr_err("incompatible file format");
 		goto out_close;
 	}
@@ -49,7 +63,21 @@ out_close:
 	return -1;
 }
 
-struct perf_session *perf_session__new(const char *filename, int mode, bool force)
+void perf_session__update_sample_type(struct perf_session *self)
+{
+	self->sample_type = perf_header__sample_type(&self->header);
+}
+
+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;
+}
+
+struct perf_session *perf_session__new(const char *filename, int mode, bool force, bool repipe)
 {
 	size_t len = filename ? strlen(filename) + 1 : 0;
 	struct perf_session *self = zalloc(sizeof(*self) + len);
@@ -62,17 +90,30 @@ struct perf_session *perf_session__new(const char *filename, int mode, bool forc
 
 	memcpy(self->filename, filename, len);
 	self->threads = RB_ROOT;
+	INIT_LIST_HEAD(&self->dead_threads);
+	self->hists_tree = RB_ROOT;
 	self->last_match = NULL;
 	self->mmap_window = 32;
 	self->cwd = NULL;
 	self->cwdlen = 0;
-	map_groups__init(&self->kmaps);
+	self->machines = RB_ROOT;
+	self->repipe = repipe;
+	INIT_LIST_HEAD(&self->ordered_samples.samples_head);
+	machine__init(&self->host_machine, "", HOST_KERNEL_ID);
 
-	if (perf_session__create_kernel_maps(self) < 0)
-		goto out_delete;
+	if (mode == O_RDONLY) {
+		if (perf_session__open(self, force) < 0)
+			goto out_delete;
+	} else if (mode == O_WRONLY) {
+		/*
+		 * In O_RDONLY mode this will be performed when reading the
+		 * kernel MMAP event, in event__process_mmap().
+		 */
+		if (perf_session__create_kernel_maps(self) < 0)
+			goto out_delete;
+	}
 
-	if (mode == O_RDONLY && perf_session__open(self, force) < 0)
-		goto out_delete;
+	perf_session__update_sample_type(self);
 out:
 	return self;
 out_free:
@@ -91,6 +132,16 @@ void perf_session__delete(struct perf_session *self)
 	free(self);
 }
 
+void perf_session__remove_thread(struct perf_session *self, struct thread *th)
+{
+	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))
@@ -99,22 +150,17 @@ static bool symbol__match_parent_regex(struct symbol *sym)
 	return 0;
 }
 
-struct symbol **perf_session__resolve_callchain(struct perf_session *self,
-						struct thread *thread,
-						struct ip_callchain *chain,
-						struct symbol **parent)
+struct map_symbol *perf_session__resolve_callchain(struct perf_session *self,
+						   struct thread *thread,
+						   struct ip_callchain *chain,
+						   struct symbol **parent)
 {
 	u8 cpumode = PERF_RECORD_MISC_USER;
-	struct symbol **syms = NULL;
 	unsigned int i;
+	struct map_symbol *syms = calloc(chain->nr, sizeof(*syms));
 
-	if (symbol_conf.use_callchain) {
-		syms = calloc(chain->nr, sizeof(*syms));
-		if (!syms) {
-			fprintf(stderr, "Can't allocate memory for symbols\n");
-			exit(-1);
-		}
-	}
+	if (!syms)
+		return NULL;
 
 	for (i = 0; i < chain->nr; i++) {
 		u64 ip = chain->ips[i];
@@ -134,17 +180,736 @@ struct symbol **perf_session__resolve_callchain(struct perf_session *self,
 			continue;
 		}
 
+		al.filtered = false;
 		thread__find_addr_location(thread, self, cpumode,
-					   MAP__FUNCTION, ip, &al, NULL);
+				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;
-			syms[i] = al.sym;
+			syms[i].map = al.map;
+			syms[i].sym = al.sym;
 		}
 	}
 
 	return syms;
 }
+
+static int process_event_stub(event_t *event __used,
+			      struct perf_session *session __used)
+{
+	dump_printf(": unhandled!\n");
+	return 0;
+}
+
+static int process_finished_round_stub(event_t *event __used,
+				       struct perf_session *session __used,
+				       struct perf_event_ops *ops __used)
+{
+	dump_printf(": unhandled!\n");
+	return 0;
+}
+
+static int process_finished_round(event_t *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_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 = process_event_stub;
+	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_stub;
+	if (handler->event_type == NULL)
+		handler->event_type = process_event_stub;
+	if (handler->tracing_data == NULL)
+		handler->tracing_data = process_event_stub;
+	if (handler->build_id == NULL)
+		handler->build_id = process_event_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 event__all64_swap(event_t *self)
+{
+	struct perf_event_header *hdr = &self->header;
+	mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr));
+}
+
+static void event__comm_swap(event_t *self)
+{
+	self->comm.pid = bswap_32(self->comm.pid);
+	self->comm.tid = bswap_32(self->comm.tid);
+}
+
+static void event__mmap_swap(event_t *self)
+{
+	self->mmap.pid	 = bswap_32(self->mmap.pid);
+	self->mmap.tid	 = bswap_32(self->mmap.tid);
+	self->mmap.start = bswap_64(self->mmap.start);
+	self->mmap.len	 = bswap_64(self->mmap.len);
+	self->mmap.pgoff = bswap_64(self->mmap.pgoff);
+}
+
+static void event__task_swap(event_t *self)
+{
+	self->fork.pid	= bswap_32(self->fork.pid);
+	self->fork.tid	= bswap_32(self->fork.tid);
+	self->fork.ppid	= bswap_32(self->fork.ppid);
+	self->fork.ptid	= bswap_32(self->fork.ptid);
+	self->fork.time	= bswap_64(self->fork.time);
+}
+
+static void event__read_swap(event_t *self)
+{
+	self->read.pid		= bswap_32(self->read.pid);
+	self->read.tid		= bswap_32(self->read.tid);
+	self->read.value	= bswap_64(self->read.value);
+	self->read.time_enabled	= bswap_64(self->read.time_enabled);
+	self->read.time_running	= bswap_64(self->read.time_running);
+	self->read.id		= bswap_64(self->read.id);
+}
+
+static void event__attr_swap(event_t *self)
+{
+	size_t size;
+
+	self->attr.attr.type		= bswap_32(self->attr.attr.type);
+	self->attr.attr.size		= bswap_32(self->attr.attr.size);
+	self->attr.attr.config		= bswap_64(self->attr.attr.config);
+	self->attr.attr.sample_period	= bswap_64(self->attr.attr.sample_period);
+	self->attr.attr.sample_type	= bswap_64(self->attr.attr.sample_type);
+	self->attr.attr.read_format	= bswap_64(self->attr.attr.read_format);
+	self->attr.attr.wakeup_events	= bswap_32(self->attr.attr.wakeup_events);
+	self->attr.attr.bp_type		= bswap_32(self->attr.attr.bp_type);
+	self->attr.attr.bp_addr		= bswap_64(self->attr.attr.bp_addr);
+	self->attr.attr.bp_len		= bswap_64(self->attr.attr.bp_len);
+
+	size = self->header.size;
+	size -= (void *)&self->attr.id - (void *)self;
+	mem_bswap_64(self->attr.id, size);
+}
+
+static void event__event_type_swap(event_t *self)
+{
+	self->event_type.event_type.event_id =
+		bswap_64(self->event_type.event_type.event_id);
+}
+
+static void event__tracing_data_swap(event_t *self)
+{
+	self->tracing_data.size = bswap_32(self->tracing_data.size);
+}
+
+typedef void (*event__swap_op)(event_t *self);
+
+static event__swap_op event__swap_ops[] = {
+	[PERF_RECORD_MMAP]   = event__mmap_swap,
+	[PERF_RECORD_COMM]   = event__comm_swap,
+	[PERF_RECORD_FORK]   = event__task_swap,
+	[PERF_RECORD_EXIT]   = event__task_swap,
+	[PERF_RECORD_LOST]   = event__all64_swap,
+	[PERF_RECORD_READ]   = event__read_swap,
+	[PERF_RECORD_SAMPLE] = event__all64_swap,
+	[PERF_RECORD_HEADER_ATTR]   = event__attr_swap,
+	[PERF_RECORD_HEADER_EVENT_TYPE]   = event__event_type_swap,
+	[PERF_RECORD_HEADER_TRACING_DATA]   = event__tracing_data_swap,
+	[PERF_RECORD_HEADER_BUILD_ID]   = NULL,
+	[PERF_RECORD_HEADER_MAX]    = NULL,
+};
+
+struct sample_queue {
+	u64			timestamp;
+	struct sample_event	*event;
+	struct list_head	list;
+};
+
+static void flush_sample_queue(struct perf_session *s,
+			       struct perf_event_ops *ops)
+{
+	struct list_head *head = &s->ordered_samples.samples_head;
+	u64 limit = s->ordered_samples.next_flush;
+	struct sample_queue *tmp, *iter;
+
+	if (!ops->ordered_samples || !limit)
+		return;
+
+	list_for_each_entry_safe(iter, tmp, head, list) {
+		if (iter->timestamp > limit)
+			return;
+
+		if (iter == s->ordered_samples.last_inserted)
+			s->ordered_samples.last_inserted = NULL;
+
+		ops->sample((event_t *)iter->event, s);
+
+		s->ordered_samples.last_flush = iter->timestamp;
+		list_del(&iter->list);
+		free(iter->event);
+		free(iter);
+	}
+}
+
+/*
+ * 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(event_t *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;
+}
+
+static void __queue_sample_end(struct sample_queue *new, struct list_head *head)
+{
+	struct sample_queue *iter;
+
+	list_for_each_entry_reverse(iter, head, list) {
+		if (iter->timestamp < new->timestamp) {
+			list_add(&new->list, &iter->list);
+			return;
+		}
+	}
+
+	list_add(&new->list, head);
+}
+
+static void __queue_sample_before(struct sample_queue *new,
+				  struct sample_queue *iter,
+				  struct list_head *head)
+{
+	list_for_each_entry_continue_reverse(iter, head, list) {
+		if (iter->timestamp < new->timestamp) {
+			list_add(&new->list, &iter->list);
+			return;
+		}
+	}
+
+	list_add(&new->list, head);
+}
+
+static void __queue_sample_after(struct sample_queue *new,
+				 struct sample_queue *iter,
+				 struct list_head *head)
+{
+	list_for_each_entry_continue(iter, head, list) {
+		if (iter->timestamp > new->timestamp) {
+			list_add_tail(&new->list, &iter->list);
+			return;
+		}
+	}
+	list_add_tail(&new->list, head);
+}
+
+/* The queue is ordered by time */
+static void __queue_sample_event(struct sample_queue *new,
+				 struct perf_session *s)
+{
+	struct sample_queue *last_inserted = s->ordered_samples.last_inserted;
+	struct list_head *head = &s->ordered_samples.samples_head;
+
+
+	if (!last_inserted) {
+		__queue_sample_end(new, head);
+		return;
+	}
+
+	/*
+	 * Most of the time the current event has a timestamp
+	 * very close to the last event inserted, unless we just switched
+	 * to another event buffer. Having a sorting based on a list and
+	 * on the last inserted event that is close to the current one is
+	 * probably more efficient than an rbtree based sorting.
+	 */
+	if (last_inserted->timestamp >= new->timestamp)
+		__queue_sample_before(new, last_inserted, head);
+	else
+		__queue_sample_after(new, last_inserted, head);
+}
+
+static int queue_sample_event(event_t *event, struct sample_data *data,
+			      struct perf_session *s)
+{
+	u64 timestamp = data->time;
+	struct sample_queue *new;
+
+
+	if (timestamp < s->ordered_samples.last_flush) {
+		printf("Warning: Timestamp below last timeslice flush\n");
+		return -EINVAL;
+	}
+
+	new = malloc(sizeof(*new));
+	if (!new)
+		return -ENOMEM;
+
+	new->timestamp = timestamp;
+
+	new->event = malloc(event->header.size);
+	if (!new->event) {
+		free(new);
+		return -ENOMEM;
+	}
+
+	memcpy(new->event, event, event->header.size);
+
+	__queue_sample_event(new, s);
+	s->ordered_samples.last_inserted = new;
+
+	if (new->timestamp > s->ordered_samples.max_timestamp)
+		s->ordered_samples.max_timestamp = new->timestamp;
+
+	return 0;
+}
+
+static int perf_session__process_sample(event_t *event, struct perf_session *s,
+					struct perf_event_ops *ops)
+{
+	struct sample_data data;
+
+	if (!ops->ordered_samples)
+		return ops->sample(event, s);
+
+	bzero(&data, sizeof(struct sample_data));
+	event__parse_sample(event, s->sample_type, &data);
+
+	queue_sample_event(event, &data, s);
+
+	return 0;
+}
+
+static int perf_session__process_event(struct perf_session *self,
+				       event_t *event,
+				       struct perf_event_ops *ops,
+				       u64 offset, u64 head)
+{
+	trace_event(event);
+
+	if (event->header.type < PERF_RECORD_HEADER_MAX) {
+		dump_printf("%#Lx [%#x]: PERF_RECORD_%s",
+			    offset + head, event->header.size,
+			    event__name[event->header.type]);
+		hists__inc_nr_events(&self->hists, event->header.type);
+	}
+
+	if (self->header.needs_swap && event__swap_ops[event->header.type])
+		event__swap_ops[event->header.type](event);
+
+	switch (event->header.type) {
+	case PERF_RECORD_SAMPLE:
+		return perf_session__process_sample(event, self, ops);
+	case PERF_RECORD_MMAP:
+		return ops->mmap(event, self);
+	case PERF_RECORD_COMM:
+		return ops->comm(event, self);
+	case PERF_RECORD_FORK:
+		return ops->fork(event, self);
+	case PERF_RECORD_EXIT:
+		return ops->exit(event, self);
+	case PERF_RECORD_LOST:
+		return ops->lost(event, self);
+	case PERF_RECORD_READ:
+		return ops->read(event, self);
+	case PERF_RECORD_THROTTLE:
+		return ops->throttle(event, self);
+	case PERF_RECORD_UNTHROTTLE:
+		return ops->unthrottle(event, self);
+	case PERF_RECORD_HEADER_ATTR:
+		return ops->attr(event, self);
+	case PERF_RECORD_HEADER_EVENT_TYPE:
+		return ops->event_type(event, self);
+	case PERF_RECORD_HEADER_TRACING_DATA:
+		/* setup for reading amidst mmap */
+		lseek(self->fd, offset + head, SEEK_SET);
+		return ops->tracing_data(event, self);
+	case PERF_RECORD_HEADER_BUILD_ID:
+		return ops->build_id(event, self);
+	case PERF_RECORD_FINISHED_ROUND:
+		return ops->finished_round(event, self, ops);
+	default:
+		++self->hists.stats.nr_unknown_events;
+		return -1;
+	}
+}
+
+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;
+}
+
+int do_read(int fd, void *buf, size_t size)
+{
+	void *buf_start = buf;
+
+	while (size) {
+		int ret = read(fd, buf, size);
+
+		if (ret <= 0)
+			return ret;
+
+		size -= ret;
+		buf += ret;
+	}
+
+	return buf - buf_start;
+}
+
+#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)
+{
+	event_t event;
+	uint32_t size;
+	int skip = 0;
+	u64 head;
+	int err;
+	void *p;
+
+	perf_event_ops__fill_defaults(ops);
+
+	head = 0;
+more:
+	err = do_read(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 = do_read(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,
+						0, head)) < 0) {
+		dump_printf("%#Lx [%#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;
+
+	dump_printf("\n%#Lx [%#x]: event: %d\n",
+		    head, event.header.size, event.header.type);
+
+	if (skip > 0)
+		head += skip;
+
+	if (!session_done())
+		goto more;
+done:
+	err = 0;
+out_err:
+	return err;
+}
+
+int __perf_session__process_events(struct perf_session *self,
+				   u64 data_offset, u64 data_size,
+				   u64 file_size, struct perf_event_ops *ops)
+{
+	int err, mmap_prot, mmap_flags;
+	u64 head, shift;
+	u64 offset = 0;
+	size_t	page_size;
+	event_t *event;
+	uint32_t size;
+	char *buf;
+	struct ui_progress *progress = ui_progress__new("Processing events...",
+							self->size);
+	if (progress == NULL)
+		return -1;
+
+	perf_event_ops__fill_defaults(ops);
+
+	page_size = sysconf(_SC_PAGESIZE);
+
+	head = data_offset;
+	shift = page_size * (head / page_size);
+	offset += shift;
+	head -= shift;
+
+	mmap_prot  = PROT_READ;
+	mmap_flags = MAP_SHARED;
+
+	if (self->header.needs_swap) {
+		mmap_prot  |= PROT_WRITE;
+		mmap_flags = MAP_PRIVATE;
+	}
+remap:
+	buf = mmap(NULL, page_size * self->mmap_window, mmap_prot,
+		   mmap_flags, self->fd, offset);
+	if (buf == MAP_FAILED) {
+		pr_err("failed to mmap file\n");
+		err = -errno;
+		goto out_err;
+	}
+
+more:
+	event = (event_t *)(buf + head);
+	ui_progress__update(progress, offset);
+
+	if (self->header.needs_swap)
+		perf_event_header__bswap(&event->header);
+	size = event->header.size;
+	if (size == 0)
+		size = 8;
+
+	if (head + event->header.size >= page_size * self->mmap_window) {
+		int munmap_ret;
+
+		shift = page_size * (head / page_size);
+
+		munmap_ret = munmap(buf, page_size * self->mmap_window);
+		assert(munmap_ret == 0);
+
+		offset += shift;
+		head -= shift;
+		goto remap;
+	}
+
+	size = event->header.size;
+
+	dump_printf("\n%#Lx [%#x]: event: %d\n",
+		    offset + head, event->header.size, event->header.type);
+
+	if (size == 0 ||
+	    perf_session__process_event(self, event, ops, offset, head) < 0) {
+		dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
+			    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;
+
+	if (offset + head >= data_offset + data_size)
+		goto done;
+
+	if (offset + head < file_size)
+		goto more;
+done:
+	err = 0;
+	/* do the final flush for ordered samples */
+	self->ordered_samples.next_flush = ULLONG_MAX;
+	flush_sample_queue(self, ops);
+out_err:
+	ui_progress__delete(progress);
+	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 (!symbol_conf.full_paths) {
+		char bf[PATH_MAX];
+
+		if (getcwd(bf, sizeof(bf)) == NULL) {
+			err = -errno;
+out_getcwd_err:
+			pr_err("failed to get the current directory\n");
+			goto out_err;
+		}
+		self->cwd = strdup(bf);
+		if (self->cwd == NULL) {
+			err = -ENOMEM;
+			goto out_getcwd_err;
+		}
+		self->cwdlen = strlen(self->cwd);
+	}
+
+	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);
+out_err:
+	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);
+}