perf machine: Introduce struct machines

That consolidates the grouping of host + guests, isolating a bit more of
functionality now centered on 'perf_session' that can be used
independently in tools that don't need a 'perf_session' instance, but
needs to have all the thread/map/symbol machinery.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-c700rsiphpmzv8klogojpfut@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-record.c

@@ -571,8 +571,8 @@ static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
 		       "Check /proc/modules permission or run as root.\n");
 
 	if (perf_guest) {
-		machines__process(&session->machines,
-				  perf_event__synthesize_guest_os, tool);
+		machines__process_guests(&session->machines,
+					 perf_event__synthesize_guest_os, tool);
 	}
 
 	if (!opts->target.system_wide)

tools/perf/builtin-report.c

@@ -372,7 +372,7 @@ static int __cmd_report(struct perf_report *rep)
 	if (ret)
 		goto out_delete;
 
-	kernel_map = session->host_machine.vmlinux_maps[MAP__FUNCTION];
+	kernel_map = session->machines.host.vmlinux_maps[MAP__FUNCTION];
 	kernel_kmap = map__kmap(kernel_map);
 	if (kernel_map == NULL ||
 	    (kernel_map->dso->hit &&

tools/perf/builtin-top.c

@@ -966,10 +966,10 @@ static int __cmd_top(struct perf_top *top)
 	if (perf_target__has_task(&opts->target))
 		perf_event__synthesize_thread_map(&top->tool, top->evlist->threads,
 						  perf_event__process,
-						  &top->session->host_machine);
+						  &top->session->machines.host);
 	else
 		perf_event__synthesize_threads(&top->tool, perf_event__process,
-					       &top->session->host_machine);
+					       &top->session->machines.host);
 	perf_top__start_counters(top);
 	top->session->evlist = top->evlist;
 	perf_session__set_id_hdr_size(top->session);

tools/perf/tests/hists_link.c

@@ -75,13 +75,11 @@ static struct {
 	{ "[kernel]", kernel_syms, ARRAY_SIZE(kernel_syms) },
 };
 
-static struct machine *setup_fake_machine(void)
+static struct machine *setup_fake_machine(struct machines *machines)
 {
-	struct rb_root machine_root = RB_ROOT;
-	struct machine *machine;
+	struct machine *machine = machines__find(machines, HOST_KERNEL_ID);
 	size_t i;
 
-	machine = machines__findnew(&machine_root, HOST_KERNEL_ID);
 	if (machine == NULL) {
 		pr_debug("Not enough memory for machine setup\n");
 		return NULL;
@@ -435,6 +433,7 @@ static void print_hists(struct hists *hists)
 int test__hists_link(void)
 {
 	int err = -1;
+	struct machines machines;
 	struct machine *machine = NULL;
 	struct perf_evsel *evsel, *first;
         struct perf_evlist *evlist = perf_evlist__new(NULL, NULL);
@@ -452,8 +451,10 @@ int test__hists_link(void)
 	/* default sort order (comm,dso,sym) will be used */
 	setup_sorting(NULL, NULL);
 
+	machines__init(&machines);
+
 	/* setup threads/dso/map/symbols also */
-	machine = setup_fake_machine();
+	machine = setup_fake_machine(&machines);
 	if (!machine)
 		goto out;
 
@@ -492,11 +493,7 @@ int test__hists_link(void)
 out:
 	/* tear down everything */
 	perf_evlist__delete(evlist);
-
-	if (machine) {
-		machine__delete_threads(machine);
-		machine__delete(machine);
-	}
+	machines__exit(&machines);
 
 	return err;
 }

tools/perf/util/header.c

@@ -287,12 +287,12 @@ static int dsos__write_buildid_table(struct perf_header *header, int fd)
 	struct perf_session *session = container_of(header,
 			struct perf_session, header);
 	struct rb_node *nd;
-	int err = machine__write_buildid_table(&session->host_machine, fd);
+	int err = machine__write_buildid_table(&session->machines.host, fd);
 
 	if (err)
 		return err;
 
-	for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
+	for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
 		struct machine *pos = rb_entry(nd, struct machine, rb_node);
 		err = machine__write_buildid_table(pos, fd);
 		if (err)
@@ -448,9 +448,9 @@ static int perf_session__cache_build_ids(struct perf_session *session)
 	if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
 		return -1;
 
-	ret = machine__cache_build_ids(&session->host_machine, debugdir);
+	ret = machine__cache_build_ids(&session->machines.host, debugdir);
 
-	for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
+	for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
 		struct machine *pos = rb_entry(nd, struct machine, rb_node);
 		ret |= machine__cache_build_ids(pos, debugdir);
 	}
@@ -467,9 +467,9 @@ static bool machine__read_build_ids(struct machine *machine, bool with_hits)
 static bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
 {
 	struct rb_node *nd;
-	bool ret = machine__read_build_ids(&session->host_machine, with_hits);
+	bool ret = machine__read_build_ids(&session->machines.host, with_hits);
 
-	for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
+	for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
 		struct machine *pos = rb_entry(nd, struct machine, rb_node);
 		ret |= machine__read_build_ids(pos, with_hits);
 	}

tools/perf/util/machine.c

@@ -91,10 +91,22 @@ void machine__delete(struct machine *machine)
 	free(machine);
 }
 
-struct machine *machines__add(struct rb_root *machines, pid_t pid,
+void machines__init(struct machines *machines)
+{
+	machine__init(&machines->host, "", HOST_KERNEL_ID);
+	machines->guests = RB_ROOT;
+}
+
+void machines__exit(struct machines *machines)
+{
+	machine__exit(&machines->host);
+	/* XXX exit guest */
+}
+
+struct machine *machines__add(struct machines *machines, pid_t pid,
 			      const char *root_dir)
 {
-	struct rb_node **p = &machines->rb_node;
+	struct rb_node **p = &machines->guests.rb_node;
 	struct rb_node *parent = NULL;
 	struct machine *pos, *machine = malloc(sizeof(*machine));
 
@@ -116,18 +128,21 @@ struct machine *machines__add(struct rb_root *machines, pid_t pid,
 	}
 
 	rb_link_node(&machine->rb_node, parent, p);
-	rb_insert_color(&machine->rb_node, machines);
+	rb_insert_color(&machine->rb_node, &machines->guests);
 
 	return machine;
 }
 
-struct machine *machines__find(struct rb_root *machines, pid_t pid)
+struct machine *machines__find(struct machines *machines, pid_t pid)
 {
-	struct rb_node **p = &machines->rb_node;
+	struct rb_node **p = &machines->guests.rb_node;
 	struct rb_node *parent = NULL;
 	struct machine *machine;
 	struct machine *default_machine = NULL;
 
+	if (pid == HOST_KERNEL_ID)
+		return &machines->host;
+
 	while (*p != NULL) {
 		parent = *p;
 		machine = rb_entry(parent, struct machine, rb_node);
@@ -144,7 +159,7 @@ struct machine *machines__find(struct rb_root *machines, pid_t pid)
 	return default_machine;
 }
 
-struct machine *machines__findnew(struct rb_root *machines, pid_t pid)
+struct machine *machines__findnew(struct machines *machines, pid_t pid)
 {
 	char path[PATH_MAX];
 	const char *root_dir = "";
@@ -178,12 +193,12 @@ struct machine *machines__findnew(struct rb_root *machines, pid_t pid)
 	return machine;
 }
 
-void machines__process(struct rb_root *machines,
-		       machine__process_t process, void *data)
+void machines__process_guests(struct machines *machines,
+			      machine__process_t process, void *data)
 {
 	struct rb_node *nd;
 
-	for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
+	for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 		struct machine *pos = rb_entry(nd, struct machine, rb_node);
 		process(pos, data);
 	}
@@ -203,12 +218,14 @@ char *machine__mmap_name(struct machine *machine, char *bf, size_t size)
 	return bf;
 }
 
-void machines__set_id_hdr_size(struct rb_root *machines, u16 id_hdr_size)
+void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size)
 {
 	struct rb_node *node;
 	struct machine *machine;
 
-	for (node = rb_first(machines); node; node = rb_next(node)) {
+	machines->host.id_hdr_size = id_hdr_size;
+
+	for (node = rb_first(&machines->guests); node; node = rb_next(node)) {
 		machine = rb_entry(node, struct machine, rb_node);
 		machine->id_hdr_size = id_hdr_size;
 	}
@@ -313,12 +330,13 @@ struct map *machine__new_module(struct machine *machine, u64 start,
 	return map;
 }
 
-size_t machines__fprintf_dsos(struct rb_root *machines, FILE *fp)
+size_t machines__fprintf_dsos(struct machines *machines, FILE *fp)
 {
 	struct rb_node *nd;
-	size_t ret = 0;
+	size_t ret = __dsos__fprintf(&machines->host.kernel_dsos, fp) +
+		     __dsos__fprintf(&machines->host.user_dsos, fp);
 
-	for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
+	for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 		struct machine *pos = rb_entry(nd, struct machine, rb_node);
 		ret += __dsos__fprintf(&pos->kernel_dsos, fp);
 		ret += __dsos__fprintf(&pos->user_dsos, fp);
@@ -334,13 +352,13 @@ size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
 	       __dsos__fprintf_buildid(&machine->user_dsos, fp, skip, parm);
 }
 
-size_t machines__fprintf_dsos_buildid(struct rb_root *machines, FILE *fp,
+size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp,
 				     bool (skip)(struct dso *dso, int parm), int parm)
 {
 	struct rb_node *nd;
-	size_t ret = 0;
+	size_t ret = machine__fprintf_dsos_buildid(&machines->host, fp, skip, parm);
 
-	for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
+	for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 		struct machine *pos = rb_entry(nd, struct machine, rb_node);
 		ret += machine__fprintf_dsos_buildid(pos, fp, skip, parm);
 	}
@@ -511,7 +529,7 @@ void machine__destroy_kernel_maps(struct machine *machine)
 	}
 }
 
-int machines__create_guest_kernel_maps(struct rb_root *machines)
+int machines__create_guest_kernel_maps(struct machines *machines)
 {
 	int ret = 0;
 	struct dirent **namelist = NULL;
@@ -560,20 +578,22 @@ int machines__create_guest_kernel_maps(struct rb_root *machines)
 	return ret;
 }
 
-void machines__destroy_guest_kernel_maps(struct rb_root *machines)
+void machines__destroy_kernel_maps(struct machines *machines)
 {
-	struct rb_node *next = rb_first(machines);
+	struct rb_node *next = rb_first(&machines->guests);
+
+	machine__destroy_kernel_maps(&machines->host);
 
 	while (next) {
 		struct machine *pos = rb_entry(next, struct machine, rb_node);
 
 		next = rb_next(&pos->rb_node);
-		rb_erase(&pos->rb_node, machines);
+		rb_erase(&pos->rb_node, &machines->guests);
 		machine__delete(pos);
 	}
 }
 
-int machines__create_kernel_maps(struct rb_root *machines, pid_t pid)
+int machines__create_kernel_maps(struct machines *machines, pid_t pid)
 {
 	struct machine *machine = machines__findnew(machines, pid);
 

tools/perf/util/machine.h

@@ -47,16 +47,24 @@ int machine__process_event(struct machine *machine, union perf_event *event);
 
 typedef void (*machine__process_t)(struct machine *machine, void *data);
 
-void machines__process(struct rb_root *machines,
-		       machine__process_t process, void *data);
+struct machines {
+	struct machine host;
+	struct rb_root guests;
+};
+
+void machines__init(struct machines *machines);
+void machines__exit(struct machines *machines);
+
+void machines__process_guests(struct machines *machines,
+			      machine__process_t process, void *data);
 
-struct machine *machines__add(struct rb_root *machines, pid_t pid,
+struct machine *machines__add(struct machines *machines, pid_t pid,
 			      const char *root_dir);
-struct machine *machines__find_host(struct rb_root *machines);
-struct machine *machines__find(struct rb_root *machines, pid_t pid);
-struct machine *machines__findnew(struct rb_root *machines, pid_t pid);
+struct machine *machines__find_host(struct machines *machines);
+struct machine *machines__find(struct machines *machines, pid_t pid);
+struct machine *machines__findnew(struct machines *machines, pid_t pid);
 
-void machines__set_id_hdr_size(struct rb_root *machines, u16 id_hdr_size);
+void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size);
 char *machine__mmap_name(struct machine *machine, char *bf, size_t size);
 
 int machine__init(struct machine *machine, const char *root_dir, pid_t pid);
@@ -132,17 +140,17 @@ int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
 
 size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
 				     bool (skip)(struct dso *dso, int parm), int parm);
-size_t machines__fprintf_dsos(struct rb_root *machines, FILE *fp);
-size_t machines__fprintf_dsos_buildid(struct rb_root *machines, FILE *fp,
+size_t machines__fprintf_dsos(struct machines *machines, FILE *fp);
+size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp,
 				     bool (skip)(struct dso *dso, int parm), int parm);
 
 void machine__destroy_kernel_maps(struct machine *machine);
 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel);
 int machine__create_kernel_maps(struct machine *machine);
 
-int machines__create_kernel_maps(struct rb_root *machines, pid_t pid);
-int machines__create_guest_kernel_maps(struct rb_root *machines);
-void machines__destroy_guest_kernel_maps(struct rb_root *machines);
+int machines__create_kernel_maps(struct machines *machines, pid_t pid);
+int machines__create_guest_kernel_maps(struct machines *machines);
+void machines__destroy_kernel_maps(struct machines *machines);
 
 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp);