Initial file dump from open source releaseHEADmaster

1 files changed, 1567 insertions, 0 deletions

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
new file mode 100644
index 00000000..6f593a70
--- /dev/null
+++ b/tools/perf/util/session.c
@@ -0,0 +1,1567 @@
+#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 "tool.h"
+#include "sort.h"
+#include "util.h"
+#include "cpumap.h"
+#include "event-parse.h"
+#include "perf_regs.h"
+#include "vdso.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 (rerun with -v to learn more)");
+
+		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 (rerun with -v to learn more)");
+		goto out_close;
+	}
+
+	if (!perf_evlist__valid_sample_type(self->evlist)) {
+		pr_err("non matching sample_type");
+		goto out_close;
+	}
+
+	if (!perf_evlist__valid_sample_id_all(self->evlist)) {
+		pr_err("non matching sample_id_all");
+		goto out_close;
+	}
+
+	self->size = input_stat.st_size;
+	return 0;
+
+out_close:
+	close(self->fd);
+	self->fd = -1;
+	return -1;
+}
+
+void perf_session__set_id_hdr_size(struct perf_session *session)
+{
+	u16 id_hdr_size = perf_evlist__id_hdr_size(session->evlist);
+
+	machines__set_id_hdr_size(&session->machines, id_hdr_size);
+}
+
+int perf_session__create_kernel_maps(struct perf_session *self)
+{
+	int ret = machine__create_kernel_maps(&self->machines.host);
+
+	if (ret >= 0)
+		ret = machines__create_guest_kernel_maps(&self->machines);
+	return ret;
+}
+
+static void perf_session__destroy_kernel_maps(struct perf_session *self)
+{
+	machines__destroy_kernel_maps(&self->machines);
+}
+
+struct perf_session *perf_session__new(const char *filename, int mode,
+				       bool force, bool repipe,
+				       struct perf_tool *tool)
+{
+	struct perf_session *self;
+	struct stat st;
+	size_t len;
+
+	if (!filename || !strlen(filename)) {
+		if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode))
+			filename = "-";
+		else
+			filename = "perf.data";
+	}
+
+	len = strlen(filename);
+	self = zalloc(sizeof(*self) + len);
+
+	if (self == NULL)
+		goto out;
+
+	memcpy(self->filename, filename, len);
+	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);
+	machines__init(&self->machines);
+
+	if (mode == O_RDONLY) {
+		if (perf_session__open(self, force) < 0)
+			goto out_delete;
+		perf_session__set_id_hdr_size(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 (tool && tool->ordering_requires_timestamps &&
+	    tool->ordered_samples && !perf_evlist__sample_id_all(self->evlist)) {
+		dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
+		tool->ordered_samples = false;
+	}
+
+out:
+	return self;
+out_delete:
+	perf_session__delete(self);
+	return NULL;
+}
+
+static void perf_session__delete_dead_threads(struct perf_session *session)
+{
+	machine__delete_dead_threads(&session->machines.host);
+}
+
+static void perf_session__delete_threads(struct perf_session *session)
+{
+	machine__delete_threads(&session->machines.host);
+}
+
+static void perf_session_env__delete(struct perf_session_env *env)
+{
+	free(env->hostname);
+	free(env->os_release);
+	free(env->version);
+	free(env->arch);
+	free(env->cpu_desc);
+	free(env->cpuid);
+
+	free(env->cmdline);
+	free(env->sibling_cores);
+	free(env->sibling_threads);
+	free(env->numa_nodes);
+	free(env->pmu_mappings);
+}
+
+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);
+	perf_session_env__delete(&self->header.env);
+	machines__exit(&self->machines);
+	close(self->fd);
+	free(self);
+	vdso__exit();
+}
+
+static int process_event_synth_tracing_data_stub(union perf_event *event
+						 __maybe_unused,
+						 struct perf_session *session
+						__maybe_unused)
+{
+	dump_printf(": unhandled!\n");
+	return 0;
+}
+
+static int process_event_synth_attr_stub(union perf_event *event __maybe_unused,
+					 struct perf_evlist **pevlist
+					 __maybe_unused)
+{
+	dump_printf(": unhandled!\n");
+	return 0;
+}
+
+static int process_event_sample_stub(struct perf_tool *tool __maybe_unused,
+				     union perf_event *event __maybe_unused,
+				     struct perf_sample *sample __maybe_unused,
+				     struct perf_evsel *evsel __maybe_unused,
+				     struct machine *machine __maybe_unused)
+{
+	dump_printf(": unhandled!\n");
+	return 0;
+}
+
+static int process_event_stub(struct perf_tool *tool __maybe_unused,
+			      union perf_event *event __maybe_unused,
+			      struct perf_sample *sample __maybe_unused,
+			      struct machine *machine __maybe_unused)
+{
+	dump_printf(": unhandled!\n");
+	return 0;
+}
+
+static int process_finished_round_stub(struct perf_tool *tool __maybe_unused,
+				       union perf_event *event __maybe_unused,
+				       struct perf_session *perf_session
+				       __maybe_unused)
+{
+	dump_printf(": unhandled!\n");
+	return 0;
+}
+
+static int process_event_type_stub(struct perf_tool *tool __maybe_unused,
+				   union perf_event *event __maybe_unused)
+{
+	dump_printf(": unhandled!\n");
+	return 0;
+}
+
+static int process_finished_round(struct perf_tool *tool,
+				  union perf_event *event,
+				  struct perf_session *session);
+
+static void perf_tool__fill_defaults(struct perf_tool *tool)
+{
+	if (tool->sample == NULL)
+		tool->sample = process_event_sample_stub;
+	if (tool->mmap == NULL)
+		tool->mmap = process_event_stub;
+	if (tool->comm == NULL)
+		tool->comm = process_event_stub;
+	if (tool->fork == NULL)
+		tool->fork = process_event_stub;
+	if (tool->exit == NULL)
+		tool->exit = process_event_stub;
+	if (tool->lost == NULL)
+		tool->lost = perf_event__process_lost;
+	if (tool->read == NULL)
+		tool->read = process_event_sample_stub;
+	if (tool->throttle == NULL)
+		tool->throttle = process_event_stub;
+	if (tool->unthrottle == NULL)
+		tool->unthrottle = process_event_stub;
+	if (tool->attr == NULL)
+		tool->attr = process_event_synth_attr_stub;
+	if (tool->event_type == NULL)
+		tool->event_type = process_event_type_stub;
+	if (tool->tracing_data == NULL)
+		tool->tracing_data = process_event_synth_tracing_data_stub;
+	if (tool->build_id == NULL)
+		tool->build_id = process_finished_round_stub;
+	if (tool->finished_round == NULL) {
+		if (tool->ordered_samples)
+			tool->finished_round = process_finished_round;
+		else
+			tool->finished_round = process_finished_round_stub;
+	}
+}
+ 
+void mem_bswap_32(void *src, int byte_size)
+{
+	u32 *m = src;
+	while (byte_size > 0) {
+		*m = bswap_32(*m);
+		byte_size -= sizeof(u32);
+		++m;
+	}
+}
+
+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 swap_sample_id_all(union perf_event *event, void *data)
+{
+	void *end = (void *) event + event->header.size;
+	int size = end - data;
+
+	BUG_ON(size % sizeof(u64));
+	mem_bswap_64(data, size);
+}
+
+static void perf_event__all64_swap(union perf_event *event,
+				   bool sample_id_all __maybe_unused)
+{
+	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, bool sample_id_all)
+{
+	event->comm.pid = bswap_32(event->comm.pid);
+	event->comm.tid = bswap_32(event->comm.tid);
+
+	if (sample_id_all) {
+		void *data = &event->comm.comm;
+
+		data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
+		swap_sample_id_all(event, data);
+	}
+}
+
+static void perf_event__mmap_swap(union perf_event *event,
+				  bool sample_id_all)
+{
+	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);
+
+	if (sample_id_all) {
+		void *data = &event->mmap.filename;
+
+		data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
+		swap_sample_id_all(event, data);
+	}
+}
+
+static void perf_event__task_swap(union perf_event *event, bool sample_id_all)
+{
+	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);
+
+	if (sample_id_all)
+		swap_sample_id_all(event, &event->fork + 1);
+}
+
+static void perf_event__read_swap(union perf_event *event, bool sample_id_all)
+{
+	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);
+
+	if (sample_id_all)
+		swap_sample_id_all(event, &event->read + 1);
+}
+
+static u8 revbyte(u8 b)
+{
+	int rev = (b >> 4) | ((b & 0xf) << 4);
+	rev = ((rev & 0xcc) >> 2) | ((rev & 0x33) << 2);
+	rev = ((rev & 0xaa) >> 1) | ((rev & 0x55) << 1);
+	return (u8) rev;
+}
+
+/*
+ * XXX this is hack in attempt to carry flags bitfield
+ * throught endian village. ABI says:
+ *
+ * Bit-fields are allocated from right to left (least to most significant)
+ * on little-endian implementations and from left to right (most to least
+ * significant) on big-endian implementations.
+ *
+ * The above seems to be byte specific, so we need to reverse each
+ * byte of the bitfield. 'Internet' also says this might be implementation
+ * specific and we probably need proper fix and carry perf_event_attr
+ * bitfield flags in separate data file FEAT_ section. Thought this seems
+ * to work for now.
+ */
+static void swap_bitfield(u8 *p, unsigned len)
+{
+	unsigned i;
+
+	for (i = 0; i < len; i++) {
+		*p = revbyte(*p);
+		p++;
+	}
+}
+
+/* exported for swapping attributes in file header */
+void perf_event__attr_swap(struct perf_event_attr *attr)
+{
+	attr->type		= bswap_32(attr->type);
+	attr->size		= bswap_32(attr->size);
+	attr->config		= bswap_64(attr->config);
+	attr->sample_period	= bswap_64(attr->sample_period);
+	attr->sample_type	= bswap_64(attr->sample_type);
+	attr->read_format	= bswap_64(attr->read_format);
+	attr->wakeup_events	= bswap_32(attr->wakeup_events);
+	attr->bp_type		= bswap_32(attr->bp_type);
+	attr->bp_addr		= bswap_64(attr->bp_addr);
+	attr->bp_len		= bswap_64(attr->bp_len);
+
+	swap_bitfield((u8 *) (&attr->read_format + 1), sizeof(u64));
+}
+
+static void perf_event__hdr_attr_swap(union perf_event *event,
+				      bool sample_id_all __maybe_unused)
+{
+	size_t size;
+
+	perf_event__attr_swap(&event->attr.attr);
+
+	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,
+					bool sample_id_all __maybe_unused)
+{
+	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,
+					  bool sample_id_all __maybe_unused)
+{
+	event->tracing_data.size = bswap_32(event->tracing_data.size);
+}
+
+typedef void (*perf_event__swap_op)(union perf_event *event,
+				    bool sample_id_all);
+
+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__hdr_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_tool *tool,
+				      u64 file_offset);
+
+static int flush_sample_queue(struct perf_session *s,
+			       struct perf_tool *tool)
+{
+	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;
+	unsigned idx = 0, progress_next = os->nr_samples / 16;
+	int ret;
+
+	if (!tool->ordered_samples || !limit)
+		return 0;
+
+	list_for_each_entry_safe(iter, tmp, head, list) {
+		if (iter->timestamp > limit)
+			break;
+
+		ret = perf_evlist__parse_sample(s->evlist, iter->event, &sample);
+		if (ret)
+			pr_err("Can't parse sample, err = %d\n", ret);
+		else {
+			ret = perf_session_deliver_event(s, iter->event, &sample, tool,
+							 iter->file_offset);
+			if (ret)
+				return ret;
+		}
+
+		os->last_flush = iter->timestamp;
+		list_del(&iter->list);
+		list_add(&iter->list, &os->sample_cache);
+		if (++idx >= progress_next) {
+			progress_next += os->nr_samples / 16;
+			ui_progress__update(idx, os->nr_samples,
+					    "Processing time ordered events...");
+		}
+	}
+
+	if (list_empty(head)) {
+		os->last_sample = NULL;
+	} else if (last_ts <= limit) {
+		os->last_sample =
+			list_entry(head->prev, struct sample_queue, list);
+	}
+
+	os->nr_samples = 0;
+
+	return 0;
+}
+
+/*
+ * 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(struct perf_tool *tool,
+				  union perf_event *event __maybe_unused,
+				  struct perf_session *session)
+{
+	int ret = flush_sample_queue(session, tool);
+	if (!ret)
+		session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
+
+	return ret;
+}
+
+/* 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->nr_samples;
+	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) {
+		s->stats.nr_unordered_events++;
+	}
+
+	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 branch_stack__printf(struct perf_sample *sample)
+{
+	uint64_t i;
+
+	printf("... branch stack: nr:%" PRIu64 "\n", sample->branch_stack->nr);
+
+	for (i = 0; i < sample->branch_stack->nr; i++)
+		printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 "\n",
+			i, sample->branch_stack->entries[i].from,
+			sample->branch_stack->entries[i].to);
+}
+
+static void regs_dump__printf(u64 mask, u64 *regs)
+{
+	unsigned rid, i = 0;
+
+	for_each_set_bit(rid, (unsigned long *) &mask, sizeof(mask) * 8) {
+		u64 val = regs[i++];
+
+		printf(".... %-5s 0x%" PRIx64 "\n",
+		       perf_reg_name(rid), val);
+	}
+}
+
+static void regs_user__printf(struct perf_sample *sample, u64 mask)
+{
+	struct regs_dump *user_regs = &sample->user_regs;
+
+	if (user_regs->regs) {
+		printf("... user regs: mask 0x%" PRIx64 "\n", mask);
+		regs_dump__printf(mask, user_regs->regs);
+	}
+}
+
+static void stack_user__printf(struct stack_dump *dump)
+{
+	printf("... ustack: size %" PRIu64 ", offset 0x%x\n",
+	       dump->size, dump->offset);
+}
+
+static void perf_session__print_tstamp(struct perf_session *session,
+				       union perf_event *event,
+				       struct perf_sample *sample)
+{
+	u64 sample_type = perf_evlist__sample_type(session->evlist);
+
+	if (event->header.type != PERF_RECORD_SAMPLE &&
+	    !perf_evlist__sample_id_all(session->evlist)) {
+		fputs("-1 -1 ", stdout);
+		return;
+	}
+
+	if ((sample_type & PERF_SAMPLE_CPU))
+		printf("%u ", sample->cpu);
+
+	if (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_evsel *evsel, union perf_event *event,
+			struct perf_sample *sample)
+{
+	u64 sample_type;
+
+	if (!dump_trace)
+		return;
+
+	printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n",
+	       event->header.misc, sample->pid, sample->tid, sample->ip,
+	       sample->period, sample->addr);
+
+	sample_type = evsel->attr.sample_type;
+
+	if (sample_type & PERF_SAMPLE_CALLCHAIN)
+		callchain__printf(sample);
+
+	if (sample_type & PERF_SAMPLE_BRANCH_STACK)
+		branch_stack__printf(sample);
+
+	if (sample_type & PERF_SAMPLE_REGS_USER)
+		regs_user__printf(sample, evsel->attr.sample_regs_user);
+
+	if (sample_type & PERF_SAMPLE_STACK_USER)
+		stack_user__printf(&sample->user_stack);
+
+	if (sample_type & PERF_SAMPLE_WEIGHT)
+		printf("... weight: %" PRIu64 "\n", sample->weight);
+
+	if (sample_type & PERF_SAMPLE_DATA_SRC)
+		printf(" . data_src: 0x%"PRIx64"\n", sample->data_src);
+}
+
+static struct machine *
+	perf_session__find_machine_for_cpumode(struct perf_session *session,
+					       union perf_event *event)
+{
+	const u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
+	struct machine *machine;
+
+	if (perf_guest &&
+	    ((cpumode == PERF_RECORD_MISC_GUEST_KERNEL) ||
+	     (cpumode == PERF_RECORD_MISC_GUEST_USER))) {
+		u32 pid;
+
+		if (event->header.type == PERF_RECORD_MMAP)
+			pid = event->mmap.pid;
+		else
+			pid = event->ip.pid;
+
+		machine = perf_session__find_machine(session, pid);
+		if (!machine)
+			machine = perf_session__findnew_machine(session,
+						DEFAULT_GUEST_KERNEL_ID);
+		return machine;
+	}
+
+	return &session->machines.host;
+}
+
+static int perf_session_deliver_event(struct perf_session *session,
+				      union perf_event *event,
+				      struct perf_sample *sample,
+				      struct perf_tool *tool,
+				      u64 file_offset)
+{
+	struct perf_evsel *evsel;
+	struct machine *machine;
+
+	dump_event(session, event, file_offset, sample);
+
+	evsel = perf_evlist__id2evsel(session->evlist, sample->id);
+	if (evsel != NULL && event->header.type != PERF_RECORD_SAMPLE) {
+		/*
+		 * XXX We're leaving PERF_RECORD_SAMPLE unnacounted here
+		 * because the tools right now may apply filters, discarding
+		 * some of the samples. For consistency, in the future we
+		 * should have something like nr_filtered_samples and remove
+		 * the sample->period from total_sample_period, etc, KISS for
+		 * now tho.
+		 *
+		 * Also testing against NULL allows us to handle files without
+		 * attr.sample_id_all and/or without PERF_SAMPLE_ID. In the
+		 * future probably it'll be a good idea to restrict event
+		 * processing via perf_session to files with both set.
+		 */
+		hists__inc_nr_events(&evsel->hists, event->header.type);
+	}
+
+	machine = perf_session__find_machine_for_cpumode(session, event);
+
+	switch (event->header.type) {
+	case PERF_RECORD_SAMPLE:
+		dump_sample(evsel, event, sample);
+		if (evsel == NULL) {
+			++session->stats.nr_unknown_id;
+			return 0;
+		}
+		if (machine == NULL) {
+			++session->stats.nr_unprocessable_samples;
+			return 0;
+		}
+		return tool->sample(tool, event, sample, evsel, machine);
+	case PERF_RECORD_MMAP:
+		return tool->mmap(tool, event, sample, machine);
+	case PERF_RECORD_COMM:
+		return tool->comm(tool, event, sample, machine);
+	case PERF_RECORD_FORK:
+		return tool->fork(tool, event, sample, machine);
+	case PERF_RECORD_EXIT:
+		return tool->exit(tool, event, sample, machine);
+	case PERF_RECORD_LOST:
+		if (tool->lost == perf_event__process_lost)
+			session->stats.total_lost += event->lost.lost;
+		return tool->lost(tool, event, sample, machine);
+	case PERF_RECORD_READ:
+		return tool->read(tool, event, sample, evsel, machine);
+	case PERF_RECORD_THROTTLE:
+		return tool->throttle(tool, event, sample, machine);
+	case PERF_RECORD_UNTHROTTLE:
+		return tool->unthrottle(tool, event, sample, machine);
+	default:
+		++session->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 ||
+	    !(perf_evlist__sample_type(session->evlist) & PERF_SAMPLE_CALLCHAIN))
+		return 0;
+
+	if (!ip_callchain__valid(sample->callchain, event)) {
+		pr_debug("call-chain problem with event, skipping it.\n");
+		++session->stats.nr_invalid_chains;
+		session->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_tool *tool, u64 file_offset)
+{
+	int err;
+
+	dump_event(session, event, file_offset, NULL);
+
+	/* These events are processed right away */
+	switch (event->header.type) {
+	case PERF_RECORD_HEADER_ATTR:
+		err = tool->attr(event, &session->evlist);
+		if (err == 0)
+			perf_session__set_id_hdr_size(session);
+		return err;
+	case PERF_RECORD_HEADER_EVENT_TYPE:
+		return tool->event_type(tool, event);
+	case PERF_RECORD_HEADER_TRACING_DATA:
+		/* setup for reading amidst mmap */
+		lseek(session->fd, file_offset, SEEK_SET);
+		return tool->tracing_data(event, session);
+	case PERF_RECORD_HEADER_BUILD_ID:
+		return tool->build_id(tool, event, session);
+	case PERF_RECORD_FINISHED_ROUND:
+		return tool->finished_round(tool, event, session);
+	default:
+		return -EINVAL;
+	}
+}
+
+static void event_swap(union perf_event *event, bool sample_id_all)
+{
+	perf_event__swap_op swap;
+
+	swap = perf_event__swap_ops[event->header.type];
+	if (swap)
+		swap(event, sample_id_all);
+}
+
+static int perf_session__process_event(struct perf_session *session,
+				       union perf_event *event,
+				       struct perf_tool *tool,
+				       u64 file_offset)
+{
+	struct perf_sample sample;
+	int ret;
+
+	if (session->header.needs_swap)
+		event_swap(event, perf_evlist__sample_id_all(session->evlist));
+
+	if (event->header.type >= PERF_RECORD_HEADER_MAX)
+		return -EINVAL;
+
+	events_stats__inc(&session->stats, event->header.type);
+
+	if (event->header.type >= PERF_RECORD_USER_TYPE_START)
+		return perf_session__process_user_event(session, event, tool, file_offset);
+
+	/*
+	 * For all kernel events we get the sample data
+	 */
+	ret = perf_evlist__parse_sample(session->evlist, event, &sample);
+	if (ret)
+		return ret;
+
+	/* Preprocess sample records - precheck callchains */
+	if (perf_session__preprocess_sample(session, event, &sample))
+		return 0;
+
+	if (tool->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, tool,
+					  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);
+}
+
+struct thread *perf_session__findnew(struct perf_session *session, pid_t pid)
+{
+	return machine__findnew_thread(&session->machines.host, pid);
+}
+
+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_tool *tool)
+{
+	if (tool->lost == perf_event__process_lost &&
+	    session->stats.nr_events[PERF_RECORD_LOST] != 0) {
+		ui__warning("Processed %d events and lost %d chunks!\n\n"
+			    "Check IO/CPU overload!\n\n",
+			    session->stats.nr_events[0],
+			    session->stats.nr_events[PERF_RECORD_LOST]);
+	}
+
+	if (session->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->stats.nr_unknown_events);
+	}
+
+	if (session->stats.nr_unknown_id != 0) {
+		ui__warning("%u samples with id not present in the header\n",
+			    session->stats.nr_unknown_id);
+	}
+
+ 	if (session->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->stats.nr_invalid_chains,
+ 			    session->stats.nr_events[PERF_RECORD_SAMPLE]);
+ 	}
+
+	if (session->stats.nr_unprocessable_samples != 0) {
+		ui__warning("%u unprocessable samples recorded.\n"
+			    "Do you have a KVM guest running and not using 'perf kvm'?\n",
+			    session->stats.nr_unprocessable_samples);
+	}
+	if (session->stats.nr_unordered_events != 0)
+		ui__warning("%u out of order events recorded.\n", session->stats.nr_unordered_events);
+}
+
+#define session_done()	(*(volatile int *)(&session_done))
+volatile int session_done;
+
+static int __perf_session__process_pipe_events(struct perf_session *self,
+					       struct perf_tool *tool)
+{
+	union perf_event *event;
+	uint32_t size, cur_size = 0;
+	void *buf = NULL;
+	int skip = 0;
+	u64 head;
+	int err;
+	void *p;
+
+	perf_tool__fill_defaults(tool);
+
+	head = 0;
+	cur_size = sizeof(union perf_event);
+
+	buf = malloc(cur_size);
+	if (!buf)
+		return -errno;
+more:
+	event = buf;
+	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;
+
+	if (size > cur_size) {
+		void *new = realloc(buf, size);
+		if (!new) {
+			pr_err("failed to allocate memory to read event\n");
+			goto out_err;
+		}
+		buf = new;
+		cur_size = size;
+		event = buf;
+	}
+	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 ((skip = perf_session__process_event(self, event, tool, head)) < 0) {
+		pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
+		       head, event->header.size, event->header.type);
+		err = -EINVAL;
+		goto out_err;
+	}
+
+	head += size;
+
+	if (skip > 0)
+		head += skip;
+
+	if (!session_done())
+		goto more;
+done:
+	err = 0;
+out_err:
+	free(buf);
+	perf_session__warn_about_errors(self, tool);
+	perf_session_free_sample_buffers(self);
+	return err;
+}
+
+static union perf_event *
+fetch_mmaped_event(struct perf_session *session,
+		   u64 head, size_t mmap_size, char *buf)
+{
+	union perf_event *event;
+
+	/*
+	 * Ensure we have enough space remaining to read
+	 * the size of the event in the headers.
+	 */
+	if (head + sizeof(event->header) > mmap_size)
+		return NULL;
+
+	event = (union perf_event *)(buf + head);
+
+	if (session->header.needs_swap)
+		perf_event_header__bswap(&event->header);
+
+	if (head + event->header.size > mmap_size)
+		return NULL;
+
+	return event;
+}
+
+/*
+ * 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
+#define MMAP_SIZE ULLONG_MAX
+#define NUM_MMAPS 1
+#else
+#define MMAP_SIZE (32 * 1024 * 1024ULL)
+#define NUM_MMAPS 128
+#endif
+
+int __perf_session__process_events(struct perf_session *session,
+				   u64 data_offset, u64 data_size,
+				   u64 file_size, struct perf_tool *tool)
+{
+	u64 head, page_offset, file_offset, file_pos, progress_next;
+	int err, mmap_prot, mmap_flags, map_idx = 0;
+	size_t	mmap_size;
+	char *buf, *mmaps[NUM_MMAPS];
+	union perf_event *event;
+	uint32_t size;
+
+	perf_tool__fill_defaults(tool);
+
+	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;
+
+	mmap_size = MMAP_SIZE;
+	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:
+	event = fetch_mmaped_event(session, head, mmap_size, buf);
+	if (!event) {
+		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, tool, file_pos) < 0) {
+		pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
+		       file_offset + head, event->header.size,
+		       event->header.type);
+		err = -EINVAL;
+		goto out_err;
+	}
+
+	head += size;
+	file_pos += size;
+
+	if (file_pos >= progress_next) {
+		progress_next += file_size / 16;
+		ui_progress__update(file_pos, file_size,
+				    "Processing events...");
+	}
+
+	if (file_pos < file_size)
+		goto more;
+
+	err = 0;
+	/* do the final flush for ordered samples */
+	session->ordered_samples.next_flush = ULLONG_MAX;
+	err = flush_sample_queue(session, tool);
+out_err:
+	ui_progress__finish();
+	perf_session__warn_about_errors(session, tool);
+	perf_session_free_sample_buffers(session);
+	return err;
+}
+
+int perf_session__process_events(struct perf_session *self,
+				 struct perf_tool *tool)
+{
+	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, tool);
+	else
+		err = __perf_session__process_pipe_events(self, tool);
+
+	return err;
+}
+
+bool perf_session__has_traces(struct perf_session *session, const char *msg)
+{
+	if (!(perf_evlist__sample_type(session->evlist) & PERF_SAMPLE_RAW)) {
+		pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
+		return false;
+	}
+
+	return true;
+}
+
+int maps__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 machines__fprintf_dsos(&self->machines, fp);
+}
+
+size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
+					  bool (skip)(struct dso *dso, int parm), int parm)
+{
+	return machines__fprintf_dsos_buildid(&self->machines, fp, skip, parm);
+}
+
+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 += events_stats__fprintf(&session->stats, fp);
+
+	list_for_each_entry(pos, &session->evlist->entries, node) {
+		ret += fprintf(fp, "%s stats:\n", perf_evsel__name(pos));
+		ret += events_stats__fprintf(&pos->hists.stats, fp);
+	}
+
+	return ret;
+}
+
+size_t perf_session__fprintf(struct perf_session *session, FILE *fp)
+{
+	/*
+	 * FIXME: Here we have to actually print all the machines in this
+	 * session, not just the host...
+	 */
+	return machine__fprintf(&session->machines.host, fp);
+}
+
+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_evsel__print_ip(struct perf_evsel *evsel, union perf_event *event,
+			  struct perf_sample *sample, struct machine *machine,
+			  int print_sym, int print_dso, int print_symoffset)
+{
+	struct addr_location al;
+	struct callchain_cursor_node *node;
+
+	if (perf_event__preprocess_sample(event, machine, &al, sample,
+					  NULL) < 0) {
+		error("problem processing %d event, skipping it.\n",
+			event->header.type);
+		return;
+	}
+
+	if (symbol_conf.use_callchain && sample->callchain) {
+
+
+		if (machine__resolve_callchain(machine, evsel, al.thread,
+					       sample, NULL) != 0) {
+			if (verbose)
+				error("Failed to resolve callchain. Skipping\n");
+			return;
+		}
+		callchain_cursor_commit(&callchain_cursor);
+
+		while (1) {
+			node = callchain_cursor_current(&callchain_cursor);
+			if (!node)
+				break;
+
+			printf("\t%16" PRIx64, node->ip);
+			if (print_sym) {
+				printf(" ");
+				symbol__fprintf_symname(node->sym, stdout);
+			}
+			if (print_dso) {
+				printf(" (");
+				map__fprintf_dsoname(node->map, stdout);
+				printf(")");
+			}
+			printf("\n");
+
+			callchain_cursor_advance(&callchain_cursor);
+		}
+
+	} else {
+		printf("%16" PRIx64, sample->ip);
+		if (print_sym) {
+			printf(" ");
+			if (print_symoffset)
+				symbol__fprintf_symname_offs(al.sym, &al,
+							     stdout);
+			else
+				symbol__fprintf_symname(al.sym, stdout);
+		}
+
+		if (print_dso) {
+			printf(" (");
+			map__fprintf_dsoname(al.map, stdout);
+			printf(")");
+		}
+	}
+}
+
+int perf_session__cpu_bitmap(struct perf_session *session,
+			     const char *cpu_list, unsigned long *cpu_bitmap)
+{
+	int i;
+	struct cpu_map *map;
+
+	for (i = 0; i < PERF_TYPE_MAX; ++i) {
+		struct perf_evsel *evsel;
+
+		evsel = perf_session__find_first_evtype(session, i);
+		if (!evsel)
+			continue;
+
+		if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) {
+			pr_err("File does not contain CPU events. "
+			       "Remove -c option to proceed.\n");
+			return -1;
+		}
+	}
+
+	map = cpu_map__new(cpu_list);
+	if (map == NULL) {
+		pr_err("Invalid cpu_list\n");
+		return -1;
+	}
+
+	for (i = 0; i < map->nr; i++) {
+		int cpu = map->map[i];
+
+		if (cpu >= MAX_NR_CPUS) {
+			pr_err("Requested CPU %d too large. "
+			       "Consider raising MAX_NR_CPUS\n", cpu);
+			return -1;
+		}
+
+		set_bit(cpu, cpu_bitmap);
+	}
+
+	return 0;
+}
+
+void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
+				bool full)
+{
+	struct stat st;
+	int ret;
+
+	if (session == NULL || fp == NULL)
+		return;
+
+	ret = fstat(session->fd, &st);
+	if (ret == -1)
+		return;
+
+	fprintf(fp, "# ========\n");
+	fprintf(fp, "# captured on: %s", ctime(&st.st_ctime));
+	perf_header__fprintf_info(session, fp, full);
+	fprintf(fp, "# ========\n#\n");
+}
+
+
+int __perf_session__set_tracepoints_handlers(struct perf_session *session,
+					     const struct perf_evsel_str_handler *assocs,
+					     size_t nr_assocs)
+{
+	struct perf_evlist *evlist = session->evlist;
+	struct event_format *format;
+	struct perf_evsel *evsel;
+	char *tracepoint, *name;
+	size_t i;
+	int err;
+
+	for (i = 0; i < nr_assocs; i++) {
+		err = -ENOMEM;
+		tracepoint = strdup(assocs[i].name);
+		if (tracepoint == NULL)
+			goto out;
+
+		err = -ENOENT;
+		name = strchr(tracepoint, ':');
+		if (name == NULL)
+			goto out_free;
+
+		*name++ = '\0';
+		format = pevent_find_event_by_name(session->pevent,
+						   tracepoint, name);
+		if (format == NULL) {
+			/*
+			 * Adding a handler for an event not in the session,
+			 * just ignore it.
+			 */
+			goto next;
+		}
+
+		evsel = perf_evlist__find_tracepoint_by_id(evlist, format->id);
+		if (evsel == NULL)
+			goto next;
+
+		err = -EEXIST;
+		if (evsel->handler.func != NULL)
+			goto out_free;
+		evsel->handler.func = assocs[i].handler;
+next:
+		free(tracepoint);
+	}
+
+	err = 0;
+out:
+	return err;
+
+out_free:
+	free(tracepoint);
+	goto out;
+}