1 files changed, 46 insertions, 5 deletions

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 1e9d3f982b47..b5c2d8be4144 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -369,6 +369,15 @@ out:
 	return machine;
 }
 
+struct machine *machines__find_guest(struct machines *machines, pid_t pid)
+{
+	struct machine *machine = machines__find(machines, pid);
+
+	if (!machine)
+		machine = machines__findnew(machines, DEFAULT_GUEST_KERNEL_ID);
+	return machine;
+}
+
 void machines__process_guests(struct machines *machines,
 			      machine__process_t process, void *data)
 {
@@ -589,6 +598,24 @@ struct thread *machine__find_thread(struct machine *machine, pid_t pid,
 	return th;
 }
 
+/*
+ * Threads are identified by pid and tid, and the idle task has pid == tid == 0.
+ * So here a single thread is created for that, but actually there is a separate
+ * idle task per cpu, so there should be one 'struct thread' per cpu, but there
+ * is only 1. That causes problems for some tools, requiring workarounds. For
+ * example get_idle_thread() in builtin-sched.c, or thread_stack__per_cpu().
+ */
+struct thread *machine__idle_thread(struct machine *machine)
+{
+	struct thread *thread = machine__findnew_thread(machine, 0, 0);
+
+	if (!thread || thread__set_comm(thread, "swapper", 0) ||
+	    thread__set_namespaces(thread, 0, NULL))
+		pr_err("problem inserting idle task for machine pid %d\n", machine->pid);
+
+	return thread;
+}
+
 struct comm *machine__thread_exec_comm(struct machine *machine,
 				       struct thread *thread)
 {
@@ -1599,7 +1626,8 @@ static int machine__process_extra_kernel_map(struct machine *machine,
 }
 
 static int machine__process_kernel_mmap_event(struct machine *machine,
-					      struct extra_kernel_map *xm)
+					      struct extra_kernel_map *xm,
+					      struct build_id *bid)
 {
 	struct map *map;
 	enum dso_space_type dso_space;
@@ -1624,6 +1652,10 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
 			goto out_problem;
 
 		map->end = map->start + xm->end - xm->start;
+
+		if (build_id__is_defined(bid))
+			dso__set_build_id(map->dso, bid);
+
 	} else if (is_kernel_mmap) {
 		const char *symbol_name = (xm->name + strlen(machine->mmap_name));
 		/*
@@ -1681,6 +1713,9 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
 
 		machine__update_kernel_mmap(machine, xm->start, xm->end);
 
+		if (build_id__is_defined(bid))
+			dso__set_build_id(kernel, bid);
+
 		/*
 		 * Avoid using a zero address (kptr_restrict) for the ref reloc
 		 * symbol. Effectively having zero here means that at record
@@ -1718,11 +1753,17 @@ int machine__process_mmap2_event(struct machine *machine,
 		.ino = event->mmap2.ino,
 		.ino_generation = event->mmap2.ino_generation,
 	};
+	struct build_id __bid, *bid = NULL;
 	int ret = 0;
 
 	if (dump_trace)
 		perf_event__fprintf_mmap2(event, stdout);
 
+	if (event->header.misc & PERF_RECORD_MISC_MMAP_BUILD_ID) {
+		bid = &__bid;
+		build_id__init(bid, event->mmap2.build_id, event->mmap2.build_id_size);
+	}
+
 	if (sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
 	    sample->cpumode == PERF_RECORD_MISC_KERNEL) {
 		struct extra_kernel_map xm = {
@@ -1732,7 +1773,7 @@ int machine__process_mmap2_event(struct machine *machine,
 		};
 
 		strlcpy(xm.name, event->mmap2.filename, KMAP_NAME_LEN);
-		ret = machine__process_kernel_mmap_event(machine, &xm);
+		ret = machine__process_kernel_mmap_event(machine, &xm, bid);
 		if (ret < 0)
 			goto out_problem;
 		return 0;
@@ -1746,7 +1787,7 @@ int machine__process_mmap2_event(struct machine *machine,
 	map = map__new(machine, event->mmap2.start,
 			event->mmap2.len, event->mmap2.pgoff,
 			&dso_id, event->mmap2.prot,
-			event->mmap2.flags,
+			event->mmap2.flags, bid,
 			event->mmap2.filename, thread);
 
 	if (map == NULL)
@@ -1789,7 +1830,7 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
 		};
 
 		strlcpy(xm.name, event->mmap.filename, KMAP_NAME_LEN);
-		ret = machine__process_kernel_mmap_event(machine, &xm);
+		ret = machine__process_kernel_mmap_event(machine, &xm, NULL);
 		if (ret < 0)
 			goto out_problem;
 		return 0;
@@ -1805,7 +1846,7 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
 
 	map = map__new(machine, event->mmap.start,
 			event->mmap.len, event->mmap.pgoff,
-			NULL, prot, 0, event->mmap.filename, thread);
+			NULL, prot, 0, NULL, event->mmap.filename, thread);
 
 	if (map == NULL)
 		goto out_problem_map;