perf tools: Rename "kernel_info" to "machine"

struct kernel_info and kerninfo__ are too vague, what they really
describe are machines, virtual ones or hosts.

There are more changes to introduce helpers to shorten function calls
and to make more clear what is really being done, but I left that for
subsequent patches.

Cc: Avi Kivity <avi@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Zhang, Yanmin <yanmin_zhang@linux.intel.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

16 files changed, 280 insertions, 287 deletions

diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index f924b4332be6..986b2efcef2e 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -571,7 +571,7 @@ static int __cmd_annotate(void)
 		perf_session__fprintf(session, stdout);
 
 	if (verbose > 2)
-		dsos__fprintf(&session->kerninfo_root, stdout);
+		dsos__fprintf(&session->machines, stdout);
 
 	perf_session__collapse_resort(&session->hists);
 	perf_session__output_resort(&session->hists, session->event_total[0]);
diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c
index 623afe3fdcb8..b4a265ae3b98 100644
--- a/tools/perf/builtin-buildid-list.c
+++ b/tools/perf/builtin-buildid-list.c
@@ -46,7 +46,7 @@ static int __cmd_buildid_list(void)
 	if (with_hits)
 		perf_session__process_events(session, &build_id__mark_dso_hit_ops);
 
-	dsos__fprintf_buildid(&session->kerninfo_root, stdout, with_hits);
+	dsos__fprintf_buildid(&session->machines, stdout, with_hits);
 
 	perf_session__delete(session);
 	return err;
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index ab906cbd5c79..20674759464e 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -352,7 +352,7 @@ static void __print_result(struct rb_root *root, struct perf_session *session,
 			   int n_lines, int is_caller)
 {
 	struct rb_node *next;
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 
 	printf("%.102s\n", graph_dotted_line);
 	printf(" %-34s |",  is_caller ? "Callsite": "Alloc Ptr");
@@ -361,8 +361,8 @@ static void __print_result(struct rb_root *root, struct perf_session *session,
 
 	next = rb_first(root);
 
-	kerninfo = kerninfo__findhost(&session->kerninfo_root);
-	if (!kerninfo) {
+	machine = perf_session__find_host_machine(session);
+	if (!machine) {
 		pr_err("__print_result: couldn't find kernel information\n");
 		return;
 	}
@@ -370,7 +370,7 @@ static void __print_result(struct rb_root *root, struct perf_session *session,
 		struct alloc_stat *data = rb_entry(next, struct alloc_stat,
 						   node);
 		struct symbol *sym = NULL;
-		struct map_groups *kmaps = &kerninfo->kmaps;
+		struct map_groups *kmaps = &machine->kmaps;
 		struct map *map;
 		char buf[BUFSIZ];
 		u64 addr;
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 27f992aca8b5..83b308a035c2 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -456,14 +456,14 @@ static void atexit_header(void)
 	}
 }
 
-static void event__synthesize_guest_os(struct kernel_info *kerninfo,
-		void *data __attribute__((unused)))
+static void event__synthesize_guest_os(struct machine *machine, void *data)
 {
 	int err;
 	char *guest_kallsyms;
 	char path[PATH_MAX];
+	struct perf_session *psession = data;
 
-	if (is_host_kernel(kerninfo))
+	if (machine__is_host(machine))
 		return;
 
 	/*
@@ -475,16 +475,15 @@ static void event__synthesize_guest_os(struct kernel_info *kerninfo,
 	 *in module instead of in guest kernel.
 	 */
 	err = event__synthesize_modules(process_synthesized_event,
-			session,
-			kerninfo);
+					psession, machine);
 	if (err < 0)
 		pr_err("Couldn't record guest kernel [%d]'s reference"
-			" relocation symbol.\n", kerninfo->pid);
+		       " relocation symbol.\n", machine->pid);
 
-	if (is_default_guest(kerninfo))
+	if (machine__is_default_guest(machine))
 		guest_kallsyms = (char *) symbol_conf.default_guest_kallsyms;
 	else {
-		sprintf(path, "%s/proc/kallsyms", kerninfo->root_dir);
+		sprintf(path, "%s/proc/kallsyms", machine->root_dir);
 		guest_kallsyms = path;
 	}
 
@@ -493,13 +492,13 @@ static void event__synthesize_guest_os(struct kernel_info *kerninfo,
 	 * have no _text sometimes.
 	 */
 	err = event__synthesize_kernel_mmap(process_synthesized_event,
-			session, kerninfo, "_text");
+					    psession, machine, "_text");
 	if (err < 0)
 		err = event__synthesize_kernel_mmap(process_synthesized_event,
-				session, kerninfo, "_stext");
+						    psession, machine, "_stext");
 	if (err < 0)
 		pr_err("Couldn't record guest kernel [%d]'s reference"
-			" relocation symbol.\n", kerninfo->pid);
+		       " relocation symbol.\n", machine->pid);
 }
 
 static int __cmd_record(int argc, const char **argv)
@@ -513,7 +512,7 @@ static int __cmd_record(int argc, const char **argv)
 	int child_ready_pipe[2], go_pipe[2];
 	const bool forks = argc > 0;
 	char buf;
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 
 	page_size = sysconf(_SC_PAGE_SIZE);
 
@@ -682,31 +681,30 @@ static int __cmd_record(int argc, const char **argv)
 		advance_output(err);
 	}
 
-	kerninfo = kerninfo__findhost(&session->kerninfo_root);
-	if (!kerninfo) {
+	machine = perf_session__find_host_machine(session);
+	if (!machine) {
 		pr_err("Couldn't find native kernel information.\n");
 		return -1;
 	}
 
 	err = event__synthesize_kernel_mmap(process_synthesized_event,
-			session, kerninfo, "_text");
+					    session, machine, "_text");
 	if (err < 0)
 		err = event__synthesize_kernel_mmap(process_synthesized_event,
-				session, kerninfo, "_stext");
+						    session, machine, "_stext");
 	if (err < 0) {
 		pr_err("Couldn't record kernel reference relocation symbol.\n");
 		return err;
 	}
 
 	err = event__synthesize_modules(process_synthesized_event,
-				session, kerninfo);
+					session, machine);
 	if (err < 0) {
 		pr_err("Couldn't record kernel reference relocation symbol.\n");
 		return err;
 	}
 	if (perf_guest)
-		kerninfo__process_allkernels(&session->kerninfo_root,
-			event__synthesize_guest_os, session);
+		perf_session__process_machines(session, event__synthesize_guest_os);
 
 	if (!system_wide && profile_cpu == -1)
 		event__synthesize_thread(target_tid, process_synthesized_event,
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 816edae7c5b2..49cc367d8c30 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -313,7 +313,7 @@ static int __cmd_report(void)
 		perf_session__fprintf(session, stdout);
 
 	if (verbose > 2)
-		dsos__fprintf(&session->kerninfo_root, stdout);
+		dsos__fprintf(&session->machines, stdout);
 
 	next = rb_first(&session->stats_by_id);
 	while (next) {
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index dfd7ea7dabdd..c390f340b03d 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -854,7 +854,7 @@ static void handle_keypress(struct perf_session *session, int c)
 		case 'Q':
 			printf("exiting.\n");
 			if (dump_symtab)
-				dsos__fprintf(&session->kerninfo_root, stderr);
+				dsos__fprintf(&session->machines, stderr);
 			exit(0);
 		case 's':
 			prompt_symbol(&sym_filter_entry, "Enter details symbol");
@@ -982,7 +982,7 @@ static void event__process_sample(const event_t *self,
 	u64 ip = self->ip.ip;
 	struct sym_entry *syme;
 	struct addr_location al;
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 	u8 origin = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 
 	++samples;
@@ -992,18 +992,17 @@ static void event__process_sample(const event_t *self,
 		++us_samples;
 		if (hide_user_symbols)
 			return;
-		kerninfo = kerninfo__findhost(&session->kerninfo_root);
+		machine = perf_session__find_host_machine(session);
 		break;
 	case PERF_RECORD_MISC_KERNEL:
 		++kernel_samples;
 		if (hide_kernel_symbols)
 			return;
-		kerninfo = kerninfo__findhost(&session->kerninfo_root);
+		machine = perf_session__find_host_machine(session);
 		break;
 	case PERF_RECORD_MISC_GUEST_KERNEL:
 		++guest_kernel_samples;
-		kerninfo = kerninfo__find(&session->kerninfo_root,
-					  self->ip.pid);
+		machine = perf_session__find_machine(session, self->ip.pid);
 		break;
 	case PERF_RECORD_MISC_GUEST_USER:
 		++guest_us_samples;
@@ -1016,7 +1015,7 @@ static void event__process_sample(const event_t *self,
 		return;
 	}
 
-	if (!kerninfo && perf_guest) {
+	if (!machine && perf_guest) {
 		pr_err("Can't find guest [%d]'s kernel information\n",
 			self->ip.pid);
 		return;
@@ -1041,7 +1040,7 @@ static void event__process_sample(const event_t *self,
 		 * --hide-kernel-symbols, even if the user specifies an
 		 * invalid --vmlinux ;-)
 		 */
-		if (al.map == kerninfo->vmlinux_maps[MAP__FUNCTION] &&
+		if (al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
 		    RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
 			pr_err("The %s file can't be used\n",
 			       symbol_conf.vmlinux_name);
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index e3fa8d3d11b4..2f33ca9899bd 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -172,17 +172,17 @@ static int event__synthesize_mmap_events(pid_t pid, pid_t tgid,
 
 int event__synthesize_modules(event__handler_t process,
 			      struct perf_session *session,
-			      struct kernel_info *kerninfo)
+			      struct machine *machine)
 {
 	struct rb_node *nd;
-	struct map_groups *kmaps = &kerninfo->kmaps;
+	struct map_groups *kmaps = &machine->kmaps;
 	u16 misc;
 
 	/*
 	 * kernel uses 0 for user space maps, see kernel/perf_event.c
 	 * __perf_event_mmap
 	 */
-	if (is_host_kernel(kerninfo))
+	if (machine__is_host(machine))
 		misc = PERF_RECORD_MISC_KERNEL;
 	else
 		misc = PERF_RECORD_MISC_GUEST_KERNEL;
@@ -204,7 +204,7 @@ int event__synthesize_modules(event__handler_t process,
 				        (sizeof(ev.mmap.filename) - size));
 		ev.mmap.start = pos->start;
 		ev.mmap.len   = pos->end - pos->start;
-		ev.mmap.pid   = kerninfo->pid;
+		ev.mmap.pid   = machine->pid;
 
 		memcpy(ev.mmap.filename, pos->dso->long_name,
 		       pos->dso->long_name_len + 1);
@@ -267,7 +267,7 @@ static int find_symbol_cb(void *arg, const char *name, char type, u64 start)
 
 int event__synthesize_kernel_mmap(event__handler_t process,
 				  struct perf_session *session,
-				  struct kernel_info *kerninfo,
+				  struct machine *machine,
 				  const char *symbol_name)
 {
 	size_t size;
@@ -288,8 +288,8 @@ int event__synthesize_kernel_mmap(event__handler_t process,
 	 */
 	struct process_symbol_args args = { .name = symbol_name, };
 
-	mmap_name = kern_mmap_name(kerninfo, name_buff);
-	if (is_host_kernel(kerninfo)) {
+	mmap_name = machine__mmap_name(machine, name_buff);
+	if (machine__is_host(machine)) {
 		/*
 		 * kernel uses PERF_RECORD_MISC_USER for user space maps,
 		 * see kernel/perf_event.c __perf_event_mmap
@@ -298,10 +298,10 @@ int event__synthesize_kernel_mmap(event__handler_t process,
 		filename = "/proc/kallsyms";
 	} else {
 		ev.header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
-		if (is_default_guest(kerninfo))
+		if (machine__is_default_guest(machine))
 			filename = (char *) symbol_conf.default_guest_kallsyms;
 		else {
-			sprintf(path, "%s/proc/kallsyms", kerninfo->root_dir);
+			sprintf(path, "%s/proc/kallsyms", machine->root_dir);
 			filename = path;
 		}
 	}
@@ -309,7 +309,7 @@ int event__synthesize_kernel_mmap(event__handler_t process,
 	if (kallsyms__parse(filename, &args, find_symbol_cb) <= 0)
 		return -ENOENT;
 
-	map = kerninfo->vmlinux_maps[MAP__FUNCTION];
+	map = machine->vmlinux_maps[MAP__FUNCTION];
 	size = snprintf(ev.mmap.filename, sizeof(ev.mmap.filename),
 			"%s%s", mmap_name, symbol_name) + 1;
 	size = ALIGN(size, sizeof(u64));
@@ -318,7 +318,7 @@ int event__synthesize_kernel_mmap(event__handler_t process,
 	ev.mmap.pgoff = args.start;
 	ev.mmap.start = map->start;
 	ev.mmap.len   = map->end - ev.mmap.start;
-	ev.mmap.pid   = kerninfo->pid;
+	ev.mmap.pid   = machine->pid;
 
 	return process(&ev, session);
 }
@@ -389,18 +389,18 @@ static int event__process_kernel_mmap(event_t *self,
 {
 	struct map *map;
 	char kmmap_prefix[PATH_MAX];
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 	enum dso_kernel_type kernel_type;
 	bool is_kernel_mmap;
 
-	kerninfo = kerninfo__findnew(&session->kerninfo_root, self->mmap.pid);
-	if (!kerninfo) {
-		pr_err("Can't find id %d's kerninfo\n", self->mmap.pid);
+	machine = perf_session__findnew_machine(session, self->mmap.pid);
+	if (!machine) {
+		pr_err("Can't find id %d's machine\n", self->mmap.pid);
 		goto out_problem;
 	}
 
-	kern_mmap_name(kerninfo, kmmap_prefix);
-	if (is_host_kernel(kerninfo))
+	machine__mmap_name(machine, kmmap_prefix);
+	if (machine__is_host(machine))
 		kernel_type = DSO_TYPE_KERNEL;
 	else
 		kernel_type = DSO_TYPE_GUEST_KERNEL;
@@ -429,10 +429,9 @@ static int event__process_kernel_mmap(event_t *self,
 		} else
 			strcpy(short_module_name, self->mmap.filename);
 
-		map = map_groups__new_module(&kerninfo->kmaps,
-				self->mmap.start,
-				self->mmap.filename,
-				kerninfo);
+		map = map_groups__new_module(&machine->kmaps,
+					     self->mmap.start,
+					     self->mmap.filename, machine);
 		if (map == NULL)
 			goto out_problem;
 
@@ -449,27 +448,27 @@ static int event__process_kernel_mmap(event_t *self,
 		 * Should be there already, from the build-id table in
 		 * the header.
 		 */
-		struct dso *kernel = __dsos__findnew(&kerninfo->dsos__kernel,
-				kmmap_prefix);
+		struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
+						     kmmap_prefix);
 		if (kernel == NULL)
 			goto out_problem;
 
 		kernel->kernel = kernel_type;
-		if (__map_groups__create_kernel_maps(&kerninfo->kmaps,
-					kerninfo->vmlinux_maps, kernel) < 0)
+		if (__map_groups__create_kernel_maps(&machine->kmaps,
+						     machine->vmlinux_maps,
+						     kernel) < 0)
 			goto out_problem;
 
-		event_set_kernel_mmap_len(kerninfo->vmlinux_maps, self);
-		perf_session__set_kallsyms_ref_reloc_sym(kerninfo->vmlinux_maps,
-				symbol_name,
-				self->mmap.pgoff);
-		if (is_default_guest(kerninfo)) {
+		event_set_kernel_mmap_len(machine->vmlinux_maps, self);
+		perf_session__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
+							 symbol_name,
+							 self->mmap.pgoff);
+		if (machine__is_default_guest(machine)) {
 			/*
 			 * preload dso of guest kernel and modules
 			 */
-			dso__load(kernel,
-				kerninfo->vmlinux_maps[MAP__FUNCTION],
-				NULL);
+			dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
+				  NULL);
 		}
 	}
 	return 0;
@@ -479,7 +478,7 @@ out_problem:
 
 int event__process_mmap(event_t *self, struct perf_session *session)
 {
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 	struct thread *thread;
 	struct map *map;
 	u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
@@ -498,8 +497,8 @@ int event__process_mmap(event_t *self, struct perf_session *session)
 	}
 
 	thread = perf_session__findnew(session, self->mmap.pid);
-	kerninfo = kerninfo__findhost(&session->kerninfo_root);
-	map = map__new(&kerninfo->dsos__user, self->mmap.start,
+	machine = perf_session__find_host_machine(session);
+	map = map__new(&machine->user_dsos, self->mmap.start,
 			self->mmap.len, self->mmap.pgoff,
 			self->mmap.pid, self->mmap.filename,
 			MAP__FUNCTION, session->cwd, session->cwdlen);
@@ -546,7 +545,7 @@ void thread__find_addr_map(struct thread *self,
 			   struct addr_location *al)
 {
 	struct map_groups *mg = &self->mg;
-	struct kernel_info *kerninfo = NULL;
+	struct machine *machine = NULL;
 
 	al->thread = self;
 	al->addr = addr;
@@ -555,19 +554,19 @@ void thread__find_addr_map(struct thread *self,
 
 	if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
 		al->level = 'k';
-		kerninfo = kerninfo__findhost(&session->kerninfo_root);
-		mg = &kerninfo->kmaps;
+		machine = perf_session__find_host_machine(session);
+		mg = &machine->kmaps;
 	} else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
 		al->level = '.';
-		kerninfo = kerninfo__findhost(&session->kerninfo_root);
+		machine = perf_session__find_host_machine(session);
 	} else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
 		al->level = 'g';
-		kerninfo = kerninfo__find(&session->kerninfo_root, pid);
-		if (!kerninfo) {
+		machine = perf_session__find_machine(session, pid);
+		if (!machine) {
 			al->map = NULL;
 			return;
 		}
-		mg = &kerninfo->kmaps;
+		mg = &machine->kmaps;
 	} else {
 		/*
 		 * 'u' means guest os user space.
@@ -603,10 +602,9 @@ try_again:
 		 * in the whole kernel symbol list.
 		 */
 		if ((long long)al->addr < 0 &&
-			cpumode == PERF_RECORD_MISC_KERNEL &&
-			kerninfo &&
-			mg != &kerninfo->kmaps)  {
-			mg = &kerninfo->kmaps;
+		    cpumode == PERF_RECORD_MISC_KERNEL &&
+		    machine && mg != &machine->kmaps) {
+			mg = &machine->kmaps;
 			goto try_again;
 		}
 	} else
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 4af2ed5d48ad..b364da5b0cbf 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -156,12 +156,12 @@ void event__synthesize_threads(event__handler_t process,
 			       struct perf_session *session);
 int event__synthesize_kernel_mmap(event__handler_t process,
 				struct perf_session *session,
-				struct kernel_info *kerninfo,
+				struct machine *machine,
 				const char *symbol_name);
 
 int event__synthesize_modules(event__handler_t process,
 			      struct perf_session *session,
-			      struct kernel_info *kerninfo);
+			      struct machine *machine);
 
 int event__process_comm(event_t *self, struct perf_session *session);
 int event__process_lost(event_t *self, struct perf_session *session);
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 75d016768021..6227dc4cb2cf 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -229,10 +229,9 @@ static int dsos__write_buildid_table(struct perf_header *header, int fd)
 	int err = 0;
 	u16 kmisc, umisc;
 
-	for (nd = rb_first(&session->kerninfo_root); nd; nd = rb_next(nd)) {
-		struct kernel_info *pos = rb_entry(nd, struct kernel_info,
-				rb_node);
-		if (is_host_kernel(pos)) {
+	for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
+		struct machine *pos = rb_entry(nd, struct machine, rb_node);
+		if (machine__is_host(pos)) {
 			kmisc = PERF_RECORD_MISC_KERNEL;
 			umisc = PERF_RECORD_MISC_USER;
 		} else {
@@ -240,11 +239,11 @@ static int dsos__write_buildid_table(struct perf_header *header, int fd)
 			umisc = PERF_RECORD_MISC_GUEST_USER;
 		}
 
-		err = __dsos__write_buildid_table(&pos->dsos__kernel, pos->pid,
-				kmisc, fd);
+		err = __dsos__write_buildid_table(&pos->kernel_dsos, pos->pid,
+						  kmisc, fd);
 		if (err == 0)
-			err = __dsos__write_buildid_table(&pos->dsos__user,
-				pos->pid, umisc, fd);
+			err = __dsos__write_buildid_table(&pos->user_dsos,
+							  pos->pid, umisc, fd);
 		if (err)
 			break;
 	}
@@ -378,11 +377,10 @@ static int dsos__cache_build_ids(struct perf_header *self)
 	if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
 		return -1;
 
-	for (nd = rb_first(&session->kerninfo_root); nd; nd = rb_next(nd)) {
-		struct kernel_info *pos = rb_entry(nd, struct kernel_info,
-				rb_node);
-		ret |= __dsos__cache_build_ids(&pos->dsos__kernel, debugdir);
-		ret |= __dsos__cache_build_ids(&pos->dsos__user, debugdir);
+	for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
+		struct machine *pos = rb_entry(nd, struct machine, rb_node);
+		ret |= __dsos__cache_build_ids(&pos->kernel_dsos, debugdir);
+		ret |= __dsos__cache_build_ids(&pos->user_dsos, debugdir);
 	}
 	return ret ? -1 : 0;
 }
@@ -394,11 +392,10 @@ static bool dsos__read_build_ids(struct perf_header *self, bool with_hits)
 			struct perf_session, header);
 	struct rb_node *nd;
 
-	for (nd = rb_first(&session->kerninfo_root); nd; nd = rb_next(nd)) {
-		struct kernel_info *pos = rb_entry(nd, struct kernel_info,
-				rb_node);
-		ret |= __dsos__read_build_ids(&pos->dsos__kernel, with_hits);
-		ret |= __dsos__read_build_ids(&pos->dsos__user, with_hits);
+	for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
+		struct machine *pos = rb_entry(nd, struct machine, rb_node);
+		ret |= __dsos__read_build_ids(&pos->kernel_dsos, with_hits);
+		ret |= __dsos__read_build_ids(&pos->user_dsos, with_hits);
 	}
 
 	return ret;
@@ -685,13 +682,13 @@ static int __event_process_build_id(struct build_id_event *bev,
 {
 	int err = -1;
 	struct list_head *head;
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 	u16 misc;
 	struct dso *dso;
 	enum dso_kernel_type dso_type;
 
-	kerninfo = kerninfo__findnew(&session->kerninfo_root, bev->pid);
-	if (!kerninfo)
+	machine = perf_session__findnew_machine(session, bev->pid);
+	if (!machine)
 		goto out;
 
 	misc = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
@@ -699,16 +696,16 @@ static int __event_process_build_id(struct build_id_event *bev,
 	switch (misc) {
 	case PERF_RECORD_MISC_KERNEL:
 		dso_type = DSO_TYPE_KERNEL;
-		head = &kerninfo->dsos__kernel;
+		head = &machine->kernel_dsos;
 		break;
 	case PERF_RECORD_MISC_GUEST_KERNEL:
 		dso_type = DSO_TYPE_GUEST_KERNEL;
-		head = &kerninfo->dsos__kernel;
+		head = &machine->kernel_dsos;
 		break;
 	case PERF_RECORD_MISC_USER:
 	case PERF_RECORD_MISC_GUEST_USER:
 		dso_type = DSO_TYPE_USER;
-		head = &kerninfo->dsos__user;
+		head = &machine->user_dsos;
 		break;
 	default:
 		goto out;
@@ -1113,8 +1110,7 @@ int event__process_tracing_data(event_t *self,
 }
 
 int event__synthesize_build_id(struct dso *pos, u16 misc,
-			       event__handler_t process,
-			       struct kernel_info *kerninfo,
+			       event__handler_t process, struct machine *machine,
 			       struct perf_session *session)
 {
 	event_t ev;
@@ -1131,7 +1127,7 @@ int event__synthesize_build_id(struct dso *pos, u16 misc,
 	memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
 	ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
 	ev.build_id.header.misc = misc;
-	ev.build_id.pid = kerninfo->pid;
+	ev.build_id.pid = machine->pid;
 	ev.build_id.header.size = sizeof(ev.build_id) + len;
 	memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
 
@@ -1142,7 +1138,7 @@ int event__synthesize_build_id(struct dso *pos, u16 misc,
 
 static int __event_synthesize_build_ids(struct list_head *head, u16 misc,
 					event__handler_t process,
-					struct kernel_info *kerninfo,
+					struct machine *machine,
 					struct perf_session *session)
 {
 	struct dso *pos;
@@ -1153,7 +1149,7 @@ static int __event_synthesize_build_ids(struct list_head *head, u16 misc,
 			continue;
 
 		err = event__synthesize_build_id(pos, misc, process,
-					kerninfo, session);
+						 machine, session);
 		if (err < 0)
 			return err;
 	}
@@ -1166,15 +1162,15 @@ int event__synthesize_build_ids(event__handler_t process,
 {
 	int err = 0;
 	u16 kmisc, umisc;
-	struct kernel_info *pos;
+	struct machine *pos;
 	struct rb_node *nd;
 
 	if (!dsos__read_build_ids(&session->header, true))
 		return 0;
 
-	for (nd = rb_first(&session->kerninfo_root); nd; nd = rb_next(nd)) {
-		pos = rb_entry(nd, struct kernel_info, rb_node);
-		if (is_host_kernel(pos)) {
+	for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
+		pos = rb_entry(nd, struct machine, rb_node);
+		if (machine__is_host(pos)) {
 			kmisc = PERF_RECORD_MISC_KERNEL;
 			umisc = PERF_RECORD_MISC_USER;
 		} else {
@@ -1182,11 +1178,11 @@ int event__synthesize_build_ids(event__handler_t process,
 			umisc = PERF_RECORD_MISC_GUEST_USER;
 		}
 
-		err = __event_synthesize_build_ids(&pos->dsos__kernel,
-				kmisc, process, pos, session);
+		err = __event_synthesize_build_ids(&pos->kernel_dsos, kmisc,
+						   process, pos, session);
 		if (err == 0)
-			err = __event_synthesize_build_ids(&pos->dsos__user,
-					umisc, process, pos, session);
+			err = __event_synthesize_build_ids(&pos->user_dsos, umisc,
+							   process, pos, session);
 		if (err)
 			break;
 	}
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 275915458148..f39443db0706 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -120,7 +120,7 @@ int event__process_tracing_data(event_t *self,
 
 int event__synthesize_build_id(struct dso *pos, u16 misc,
 			       event__handler_t process,
-			       struct kernel_info *kerninfo,
+			       struct machine *machine,
 			       struct perf_session *session);
 int event__synthesize_build_ids(event__handler_t process,
 				struct perf_session *session);
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 7facd016ec97..da3d4e826231 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -245,7 +245,7 @@ void map_groups__init(struct map_groups *self)
 		self->maps[i] = RB_ROOT;
 		INIT_LIST_HEAD(&self->removed_maps[i]);
 	}
-	 self->this_kerninfo = NULL;
+	self->machine = NULL;
 }
 
 void map_groups__flush(struct map_groups *self)
@@ -513,133 +513,130 @@ struct map *maps__find(struct rb_root *maps, u64 ip)
 	return NULL;
 }
 
-struct kernel_info *add_new_kernel_info(struct rb_root *kerninfo_root,
-			pid_t pid, const char *root_dir)
+struct machine *machines__add(struct rb_root *self, pid_t pid,
+			      const char *root_dir)
 {
-	struct rb_node **p = &kerninfo_root->rb_node;
+	struct rb_node **p = &self->rb_node;
 	struct rb_node *parent = NULL;
-	struct kernel_info *kerninfo, *pos;
+	struct machine *pos, *machine = malloc(sizeof(*machine));
 
-	kerninfo = malloc(sizeof(struct kernel_info));
-	if (!kerninfo)
+	if (!machine)
 		return NULL;
 
-	kerninfo->pid = pid;
-	map_groups__init(&kerninfo->kmaps);
-	kerninfo->root_dir = strdup(root_dir);
-	RB_CLEAR_NODE(&kerninfo->rb_node);
-	INIT_LIST_HEAD(&kerninfo->dsos__user);
-	INIT_LIST_HEAD(&kerninfo->dsos__kernel);
-	kerninfo->kmaps.this_kerninfo = kerninfo;
+	machine->pid = pid;
+	map_groups__init(&machine->kmaps);
+	machine->root_dir = strdup(root_dir);
+	RB_CLEAR_NODE(&machine->rb_node);
+	INIT_LIST_HEAD(&machine->user_dsos);
+	INIT_LIST_HEAD(&machine->kernel_dsos);
+	machine->kmaps.machine = machine;
 
 	while (*p != NULL) {
 		parent = *p;
-		pos = rb_entry(parent, struct kernel_info, rb_node);
+		pos = rb_entry(parent, struct machine, rb_node);
 		if (pid < pos->pid)
 			p = &(*p)->rb_left;
 		else
 			p = &(*p)->rb_right;
 	}
 
-	rb_link_node(&kerninfo->rb_node, parent, p);
-	rb_insert_color(&kerninfo->rb_node, kerninfo_root);
+	rb_link_node(&machine->rb_node, parent, p);
+	rb_insert_color(&machine->rb_node, self);
 
-	return kerninfo;
+	return machine;
 }
 
-struct kernel_info *kerninfo__find(struct rb_root *kerninfo_root, pid_t pid)
+struct machine *machines__find(struct rb_root *self, pid_t pid)
 {
-	struct rb_node **p = &kerninfo_root->rb_node;
+	struct rb_node **p = &self->rb_node;
 	struct rb_node *parent = NULL;
-	struct kernel_info *kerninfo;
-	struct kernel_info *default_kerninfo = NULL;
+	struct machine *machine;
+	struct machine *default_machine = NULL;
 
 	while (*p != NULL) {
 		parent = *p;
-		kerninfo = rb_entry(parent, struct kernel_info, rb_node);
-		if (pid < kerninfo->pid)
+		machine = rb_entry(parent, struct machine, rb_node);
+		if (pid < machine->pid)
 			p = &(*p)->rb_left;
-		else if (pid > kerninfo->pid)
+		else if (pid > machine->pid)
 			p = &(*p)->rb_right;
 		else
-			return kerninfo;
-		if (!kerninfo->pid)
-			default_kerninfo = kerninfo;
+			return machine;
+		if (!machine->pid)
+			default_machine = machine;
 	}
 
-	return default_kerninfo;
+	return default_machine;
 }
 
-struct kernel_info *kerninfo__findhost(struct rb_root *kerninfo_root)
+/*
+ * FIXME: Why repeatedly search for this?
+ */
+struct machine *machines__find_host(struct rb_root *self)
 {
-	struct rb_node **p = &kerninfo_root->rb_node;
+	struct rb_node **p = &self->rb_node;
 	struct rb_node *parent = NULL;
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 	pid_t pid = HOST_KERNEL_ID;
 
 	while (*p != NULL) {
 		parent = *p;
-		kerninfo = rb_entry(parent, struct kernel_info, rb_node);
-		if (pid < kerninfo->pid)
+		machine = rb_entry(parent, struct machine, rb_node);
+		if (pid < machine->pid)
 			p = &(*p)->rb_left;
-		else if (pid > kerninfo->pid)
+		else if (pid > machine->pid)
 			p = &(*p)->rb_right;
 		else
-			return kerninfo;
+			return machine;
 	}
 
 	return NULL;
 }
 
-struct kernel_info *kerninfo__findnew(struct rb_root *kerninfo_root, pid_t pid)
+struct machine *machines__findnew(struct rb_root *self, pid_t pid)
 {
 	char path[PATH_MAX];
 	const char *root_dir;
-	int ret;
-	struct kernel_info *kerninfo = kerninfo__find(kerninfo_root, pid);
+	struct machine *machine = machines__find(self, pid);
 
-	if (!kerninfo || kerninfo->pid != pid) {
+	if (!machine || machine->pid != pid) {
 		if (pid == HOST_KERNEL_ID || pid == DEFAULT_GUEST_KERNEL_ID)
 			root_dir = "";
 		else {
 			if (!symbol_conf.guestmount)
 				goto out;
 			sprintf(path, "%s/%d", symbol_conf.guestmount, pid);
-			ret = access(path, R_OK);
-			if (ret) {
+			if (access(path, R_OK)) {
 				pr_err("Can't access file %s\n", path);
 				goto out;
 			}
 			root_dir = path;
 		}
-		kerninfo = add_new_kernel_info(kerninfo_root, pid, root_dir);
+		machine = machines__add(self, pid, root_dir);
 	}
 
 out:
-	return kerninfo;
+	return machine;
 }
 
-void kerninfo__process_allkernels(struct rb_root *kerninfo_root,
-		process_kernel_info process,
-		void *data)
+void machines__process(struct rb_root *self, machine__process_t process, void *data)
 {
 	struct rb_node *nd;
 
-	for (nd = rb_first(kerninfo_root); nd; nd = rb_next(nd)) {
-		struct kernel_info *pos = rb_entry(nd, struct kernel_info,
-							rb_node);
+	for (nd = rb_first(self); nd; nd = rb_next(nd)) {
+		struct machine *pos = rb_entry(nd, struct machine, rb_node);
 		process(pos, data);
 	}
 }
 
-char *kern_mmap_name(struct kernel_info *kerninfo, char *buff)
+char *machine__mmap_name(struct machine *self, char *buff)
 {
-	if (is_host_kernel(kerninfo))
+	if (machine__is_host(self))
 		sprintf(buff, "[%s]", "kernel.kallsyms");
-	else if (is_default_guest(kerninfo))
+	else if (machine__is_default_guest(self))
 		sprintf(buff, "[%s]", "guest.kernel.kallsyms");
 	else
-		sprintf(buff, "[%s.%d]", "guest.kernel.kallsyms", kerninfo->pid);
+		sprintf(buff, "[%s.%d]", "guest.kernel.kallsyms", self->pid);
 
 	return buff;
 }
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index 30d38d634e09..4c1c2da704b2 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -5,6 +5,7 @@
 #include <linux/list.h>
 #include <linux/rbtree.h>
 #include <stdio.h&