Merge branch 'perf' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux-2.6 into perf/core

23 files changed, 725 insertions, 351 deletions

diff --git a/tools/perf/Documentation/perf-test.txt b/tools/perf/Documentation/perf-test.txt
new file mode 100644
index 0000000..1c4b5f5
--- /dev/null
+++ b/tools/perf/Documentation/perf-test.txt
@@ -0,0 +1,22 @@
+perf-test(1)
+============
+
+NAME
+----
+perf-test - Runs sanity tests.
+
+SYNOPSIS
+--------
+[verse]
+'perf test <options>'
+
+DESCRIPTION
+-----------
+This command does assorted sanity tests, initially thru linked routines but
+also will look for a directory with more tests in the form of scripts.
+
+OPTIONS
+-------
+-v::
+--verbose::
+	Be more verbose.
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 3ac6b67..739c441 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -187,6 +187,8 @@ ifeq ($(ARCH),x86_64)
         ARCH := x86
 endif
 
+$(shell sh -c 'mkdir -p $(OUTPUT)arch/$(ARCH)/util/' 2> /dev/null)
+
 # CFLAGS and LDFLAGS are for the users to override from the command line.
 
 #
@@ -488,6 +490,7 @@ BUILTIN_OBJS += $(OUTPUT)builtin-probe.o
 BUILTIN_OBJS += $(OUTPUT)builtin-kmem.o
 BUILTIN_OBJS += $(OUTPUT)builtin-lock.o
 BUILTIN_OBJS += $(OUTPUT)builtin-kvm.o
+BUILTIN_OBJS += $(OUTPUT)builtin-test.o
 
 PERFLIBS = $(LIB_FILE)
 
diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index f924b43..b57dbcf 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);
+		perf_session__fprintf_dsos(session, 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 623afe3..7dc3b2e 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);
+	perf_session__fprintf_dsos_buildid(session, stdout, with_hits);
 
 	perf_session__delete(session);
 	return err;
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index ab906cb..ee05dba 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 +370,6 @@ 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 *map;
 		char buf[BUFSIZ];
 		u64 addr;
@@ -378,8 +377,7 @@ static void __print_result(struct rb_root *root, struct perf_session *session,
 		if (is_caller) {
 			addr = data->call_site;
 			if (!raw_ip)
-				sym = map_groups__find_function(kmaps, addr,
-								&map, NULL);
+				sym = machine__find_kernel_function(machine, addr, &map, NULL);
 		} else
 			addr = data->ptr;
 
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 27f992a..83b308a 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 816edae..f1b46eb 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);
+		perf_session__fprintf_dsos(session, stdout);
 
 	next = rb_first(&session->stats_by_id);
 	while (next) {
diff --git a/tools/perf/builtin-test.c b/tools/perf/builtin-test.c
new file mode 100644
index 0000000..0339612
--- /dev/null
+++ b/tools/perf/builtin-test.c
@@ -0,0 +1,281 @@
+/*
+ * builtin-test.c
+ *
+ * Builtin regression testing command: ever growing number of sanity tests
+ */
+#include "builtin.h"
+
+#include "util/cache.h"
+#include "util/debug.h"
+#include "util/parse-options.h"
+#include "util/session.h"
+#include "util/symbol.h"
+#include "util/thread.h"
+
+static long page_size;
+
+static int vmlinux_matches_kallsyms_filter(struct map *map __used, struct symbol *sym)
+{
+	bool *visited = symbol__priv(sym);
+	*visited = true;
+	return 0;
+}
+
+static int test__vmlinux_matches_kallsyms(void)
+{
+	int err = -1;
+	struct rb_node *nd;
+	struct symbol *sym;
+	struct map *kallsyms_map, *vmlinux_map;
+	struct machine kallsyms, vmlinux;
+	enum map_type type = MAP__FUNCTION;
+	struct ref_reloc_sym ref_reloc_sym = { .name = "_stext", };
+
+	/*
+	 * Step 1:
+	 *
+	 * Init the machines that will hold kernel, modules obtained from
+	 * both vmlinux + .ko files and from /proc/kallsyms split by modules.
+	 */
+	machine__init(&kallsyms, "", HOST_KERNEL_ID);
+	machine__init(&vmlinux, "", HOST_KERNEL_ID);
+
+	/*
+	 * Step 2:
+	 *
+	 * Create the kernel maps for kallsyms and the DSO where we will then
+	 * load /proc/kallsyms. Also create the modules maps from /proc/modules
+	 * and find the .ko files that match them in /lib/modules/`uname -r`/.
+	 */
+	if (machine__create_kernel_maps(&kallsyms) < 0) {
+		pr_debug("machine__create_kernel_maps ");
+		return -1;
+	}
+
+	/*
+	 * Step 3:
+	 *
+	 * Load and split /proc/kallsyms into multiple maps, one per module.
+	 */
+	if (machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, NULL) <= 0) {
+		pr_debug("dso__load_kallsyms ");
+		goto out;
+	}
+
+	/*
+	 * Step 4:
+	 *
+	 * kallsyms will be internally on demand sorted by name so that we can
+	 * find the reference relocation * symbol, i.e. the symbol we will use
+	 * to see if the running kernel was relocated by checking if it has the
+	 * same value in the vmlinux file we load.
+	 */
+	kallsyms_map = machine__kernel_map(&kallsyms, type);
+
+	sym = map__find_symbol_by_name(kallsyms_map, ref_reloc_sym.name, NULL);
+	if (sym == NULL) {
+		pr_debug("dso__find_symbol_by_name ");
+		goto out;
+	}
+
+	ref_reloc_sym.addr = sym->start;
+
+	/*
+	 * Step 5:
+	 *
+	 * Now repeat step 2, this time for the vmlinux file we'll auto-locate.
+	 */
+	if (machine__create_kernel_maps(&vmlinux) < 0) {
+		pr_debug("machine__create_kernel_maps ");
+		goto out;
+	}
+
+	vmlinux_map = machine__kernel_map(&vmlinux, type);
+	map__kmap(vmlinux_map)->ref_reloc_sym = &ref_reloc_sym;
+
+	/*
+	 * Step 6:
+	 *
+	 * Locate a vmlinux file in the vmlinux path that has a buildid that
+	 * matches the one of the running kernel.
+	 *
+	 * While doing that look if we find the ref reloc symbol, if we find it
+	 * we'll have its ref_reloc_symbol.unrelocated_addr and then
+	 * maps__reloc_vmlinux will notice and set proper ->[un]map_ip routines
+	 * to fixup the symbols.
+	 */
+	if (machine__load_vmlinux_path(&vmlinux, type,
+				       vmlinux_matches_kallsyms_filter) <= 0) {
+		pr_debug("machine__load_vmlinux_path ");
+		goto out;
+	}
+
+	err = 0;
+	/*
+	 * Step 7:
+	 *
+	 * Now look at the symbols in the vmlinux DSO and check if we find all of them
+	 * in the kallsyms dso. For the ones that are in both, check its names and
+	 * end addresses too.
+	 */
+	for (nd = rb_first(&vmlinux_map->dso->symbols[type]); nd; nd = rb_next(nd)) {
+		struct symbol *pair;
+
+		sym  = rb_entry(nd, struct symbol, rb_node);
+		pair = machine__find_kernel_symbol(&kallsyms, type, sym->start, NULL, NULL);
+
+		if (pair && pair->start == sym->start) {
+next_pair:
+			if (strcmp(sym->name, pair->name) == 0) {
+				/*
+				 * kallsyms don't have the symbol end, so we
+				 * set that by using the next symbol start - 1,
+				 * in some cases we get this up to a page
+				 * wrong, trace_kmalloc when I was developing
+				 * this code was one such example, 2106 bytes
+				 * off the real size. More than that and we
+				 * _really_ have a problem.
+				 */
+				s64 skew = sym->end - pair->end;
+				if (llabs(skew) < page_size)
+					continue;
+
+				pr_debug("%#Lx: diff end addr for %s v: %#Lx k: %#Lx\n",
+					 sym->start, sym->name, sym->end, pair->end);
+			} else {
+				struct rb_node *nnd = rb_prev(&pair->rb_node);
+
+				if (nnd) {
+					struct symbol *next = rb_entry(nnd, struct symbol, rb_node);
+
+					if (next->start == sym->start) {
+						pair = next;
+						goto next_pair;
+					}
+				}
+				pr_debug("%#Lx: diff name v: %s k: %s\n",
+					 sym->start, sym->name, pair->name);
+			}
+		} else
+			pr_debug("%#Lx: %s not on kallsyms\n", sym->start, sym->name);
+
+		err = -1;
+	}
+
+	if (!verbose)
+		goto out;
+
+	pr_info("Maps only in vmlinux:\n");
+
+	for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
+		struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
+		/*
+		 * If it is the kernel, kallsyms is always "[kernel.kallsyms]", while
+		 * the kernel will have the path for the vmlinux file being used,
+		 * so use the short name, less descriptive but the same ("[kernel]" in
+		 * both cases.
+		 */
+		pair = map_groups__find_by_name(&kallsyms.kmaps, type,
+						(pos->dso->kernel ?
+							pos->dso->short_name :
+							pos->dso->name));
+		if (pair)
+			pair->priv = 1;
+		else
+			map__fprintf(pos, stderr);
+	}
+
+	pr_info("Maps in vmlinux with a different name in kallsyms:\n");
+
+	for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
+		struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
+
+		pair = map_groups__find(&kallsyms.kmaps, type, pos->start);
+		if (pair == NULL || pair->priv)
+			continue;
+
+		if (pair->start == pos->start) {
+			pair->priv = 1;
+			pr_info(" %Lx-%Lx %Lx %s in kallsyms as",
+				pos->start, pos->end, pos->pgoff, pos->dso->name);
+			if (pos->pgoff != pair->pgoff || pos->end != pair->end)
+				pr_info(": \n*%Lx-%Lx %Lx",
+					pair->start, pair->end, pair->pgoff);
+			pr_info(" %s\n", pair->dso->name);
+			pair->priv = 1;
+		}
+	}
+
+	pr_info("Maps only in kallsyms:\n");
+
+	for (nd = rb_first(&kallsyms.kmaps.maps[type]);
+	     nd; nd = rb_next(nd)) {
+		struct map *pos = rb_entry(nd, struct map, rb_node);
+
+		if (!pos->priv)
+			map__fprintf(pos, stderr);
+	}
+out:
+	return err;
+}
+
+static struct test {
+	const char *desc;
+	int (*func)(void);
+} tests[] = {
+	{
+		.desc = "vmlinux symtab matches kallsyms",
+		.func = test__vmlinux_matches_kallsyms,
+	},
+	{
+		.func = NULL,
+	},
+};
+
+static int __cmd_test(void)
+{
+	int i = 0;
+
+	page_size = sysconf(_SC_PAGE_SIZE);
+
+	while (tests[i].func) {
+		int err;
+		pr_info("%2d: %s:", i + 1, tests[i].desc);
+		pr_debug("\n--- start ---\n");
+		err = tests[i].func();
+		pr_debug("---- end ----\n%s:", tests[i].desc);
+		pr_info(" %s\n", err ? "FAILED!\n" : "Ok");
+		++i;
+	}
+
+	return 0;
+}
+
+static const char * const test_usage[] = {
+	"perf test [<options>]",
+	NULL,
+};
+
+static const struct option test_options[] = {
+	OPT_BOOLEAN('v', "verbose", &verbose,
+		    "be more verbose (show symbol address, etc)"),
+	OPT_END()
+};
+
+int cmd_test(int argc, const char **argv, const char *prefix __used)
+{
+	argc = parse_options(argc, argv, test_options, test_usage, 0);
+	if (argc)
+		usage_with_options(test_usage, test_options);
+
+	symbol_conf.priv_size = sizeof(int);
+	symbol_conf.sort_by_name = true;
+	symbol_conf.try_vmlinux_path = true;
+
+	if (symbol__init() < 0)
+		return -1;
+
+	setup_pager();
+
+	return __cmd_test();
+}
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index dfd7ea7..d95281f 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);
+				perf_session__fprintf_dsos(session, 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/builtin.h b/tools/perf/builtin.h
index ab28bca..34a8a9a 100644
--- a/tools/perf/builtin.h
+++ b/tools/perf/builtin.h
@@ -33,5 +33,6 @@ extern int cmd_probe(int argc, const char **argv, const char *prefix);
 extern int cmd_kmem(int argc, const char **argv, const char *prefix);
 extern int cmd_lock(int argc, const char **argv, const char *prefix);
 extern int cmd_kvm(int argc, const char **argv, const char *prefix);
+extern int cmd_test(int argc, const char **argv, const char *prefix);
 
 #endif
diff --git a/tools/perf/command-list.txt b/tools/perf/command-list.txt
index 2a1162d..80a1a44 100644
--- a/tools/perf/command-list.txt
+++ b/tools/perf/command-list.txt
@@ -20,3 +20,4 @@ perf-probe			mainporcelain common
 perf-kmem			mainporcelain common
 perf-lock			mainporcelain common
 perf-kvm			mainporcelain common
+perf-test			mainporcelain common
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 985cdb4..5ff9b5b 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -308,6 +308,7 @@ static void handle_internal_command(int argc, const char **argv)
 		{ "kmem",	cmd_kmem,	0 },
 		{ "lock",	cmd_lock,	0 },
 		{ "kvm",	cmd_kvm,	0 },
+		{ "test",	cmd_test,	0 },
 	};
 	unsigned int i;
 	static const char ext[] = STRIP_EXTENSION;
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index e3fa8d3..1757b0f 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, sizeof(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, sizeof(kmmap_prefix));
+	if (machine__is_host(machine))
 		kernel_type = DSO_TYPE_KERNEL;
 	else
 		kernel_type = DSO_TYPE_GUEST_KERNEL;
@@ -429,10 +429,8 @@ 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 = machine__new_module(machine, self->mmap.start,
+					  self->mmap.filename);
 		if (map == NULL)
 			goto out_problem;
 
@@ -449,27 +447,25 @@ 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 (__machine__create_kernel_maps(machine, 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 +475,7 @@ 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 +494,8 @@ 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 +542,7 @@ 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 +551,19 @@ 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 +599,9 @@ 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 4af2ed5..b364da5 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 75d0167..6227dc4 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 2759154..f39443d 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 7facd01..44a4df6 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 +513,140 @@ 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)
+int machine__init(struct machine *self, const char *root_dir, pid_t pid)
 {
-	struct rb_node **p = &kerninfo_root->rb_node;
+	map_groups__init(&self->kmaps);
+	RB_CLEAR_NODE(&self->rb_node);
+	INIT_LIST_HEAD(&self->user_dsos);
+	INIT_LIST_HEAD(&self->kernel_dsos);
+
+	self->kmaps.machine = self;
+	self->pid	    = pid;
+	self->root_dir      = strdup(root_dir);
+	return self->root_dir == NULL ? -ENOMEM : 0;
+}
+
+struct machine *machines__add(struct rb_root *self, pid_t pid,
+			      const char *root_dir)
+{
+	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;
+	if (machine__init(machine, root_dir, pid) != 0) {
+		free(machine);
+		return NULL;
+	}
 
 	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 *bf, size_t size)
 {
-	if (is_host_kernel(kerninfo))
-		sprintf(buff, "[%s]", "kernel.kallsyms");
-	else if (is_default_guest(kerninfo))
-		sprintf(buff, "[%s]", "guest.kernel.kallsyms");
+	if (machine__is_host(self))
+		snprintf(bf, size, "[%s]", "kernel.kallsyms");
+	else if (machine__is_default_guest(self))
+		snprintf(bf, size, "[%s]", "guest.kernel.kallsyms");
 	else
-		sprintf(buff, "[%s.%d]", "guest.kernel.kallsyms", kerninfo->pid);
+		snprintf(bf, size, "[%s.%d]", "guest.kernel.kallsyms", self->pid);
 
-	return buff;
+	return bf;
 }
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index 30d38d6..f391345 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>
+#include <stdbool.h>
 #include "types.h"
 
 enum map_type {
@@ -19,7 +20,7 @@ extern const char *map_type__name[MAP__NR_TYPES];
 struct dso;
 struct ref_reloc_sym;
 struct map_groups;
-struct kernel_info;
+struct machine;
 
 struct map {
 	union {
@@ -29,6 +30,7 @@ struct map {
 	u64			start;
 	u64			end;
 	enum map_type		type;
+	u32			priv;
 	u64			pgoff;
 
 	/* ip -> dso rip */
@@ -46,25 +48,31 @@ struct kmap {
 };
 
 struct map_groups {
-	struct rb_root		maps[MAP__NR_TYPES];
-	struct list_head	removed_maps[MAP__NR_TYPES];
-	struct kernel_info	*this_kerninfo;
+	struct rb_root	 maps[MAP__NR_TYPES];
+	struct list_head removed_maps[MAP__NR_TYPES];
+	struct machine	 *machine;
 };
 
-/* Native host kernel uses -1 as pid index in kernel_info */
+/* Native host kernel uses -1 as pid index in machine */
 #define	HOST_KERNEL_ID			(-1)
 #define	DEFAULT_GUEST_KERNEL_ID		(0)
 
-struct kernel_info {
-	struct rb_node rb_node;
-	pid_t pid;
-	char *root_dir;
-	struct list_head dsos__user;
-	struct list_head dsos__kernel;
+struct machine {
+	struct rb_node	  rb_node;
+	pid_t		  pid;
+	char		  *root_dir;
+	struct list_head  user_dsos;
+	struct list_head  kernel_dsos;
 	struct map_groups kmaps;
-	struct map *vmlinux_maps[MAP__NR_TYPES];
+	struct map	  *vmlinux_maps[MAP__NR_TYPES];
 };
 
+static inline
+struct map *machine__kernel_map(struct machine *self, enum map_type type)
+{
+	return self->vmlinux_maps[type];
+}
+
 static inline struct kmap *map__kmap(struct map *self)
 {
 	return (struct kmap *)(self + 1);
@@ -124,36 +132,31 @@ int map_groups__clone(struct map_groups *self,
 size_t map_groups__fprintf(struct map_groups *self, int verbose, FILE *fp);
 size_t map_groups__fprintf_maps(struct map_groups *self, int verbose, FILE *fp);
 
-struct kernel_info *add_new_kernel_info(struct rb_root *kerninfo_root,
-			pid_t pid, const char *root_dir);
-struct kernel_info *kerninfo__find(struct rb_root *kerninfo_root, pid_t pid);
-struct kernel_info *kerninfo__findnew(struct rb_root *kerninfo_root, pid_t pid);
-struct kernel_info *kerninfo__findhost(struct rb_root *kerninfo_root);
-char *kern_mmap_name(struct kernel_info *kerninfo, char *buff);
+typedef void (*machine__process_t)(struct machine *self, void *data);
+
+void machines__process(struct rb_root *self, machine__process_t process, void *data);
+struct machine *machines__add(struct rb_root *self, pid_t pid,
+			      const char *root_dir);
+struct machine *machines__find_host(struct rb_root *self);
+struct machine *machines__find(struct rb_root *self, pid_t pid);
+struct machine *machines__findnew(struct rb_root *self, pid_t pid);
+char *machine__mmap_name(struct machine *self, char *bf, size_t size);
+int machine__init(struct machine *self, const char *root_dir, pid_t pid);
 
 /*
  * Default guest kernel is defined by parameter --guestkallsyms
  * and --guestmodules
  */
-static inline int is_default_guest(struct kernel_info *kerninfo)
+static inline bool machine__is_default_guest(struct machine *self)
 {
-	if (!kerninfo)
-		return 0;
-	return kerninfo->pid == DEFAULT_GUEST_KERNEL_ID;
+	return self ? self->pid == DEFAULT_GUEST_KERNEL_ID : false;
 }
 
-static inline int is_host_kernel(struct kernel_info *kerninfo)
+static inline bool machine__is_host(struct machine *self)
 {
-	if (!kerninfo)
-		return 0;
-	return kerninfo->pid == HOST_KERNEL_ID;
+	return self ? self->pid == HOST_KERNEL_ID : false;
 }
 
-typedef void (*process_kernel_info)(struct kernel_info *kerninfo, void *data);
-void kerninfo__process_allkernels(struct rb_root *kerninfo_root,
-				  process_kernel_info process,
-				  void *data);
-
 static inline void map_groups__insert(struct map_groups *self, struct map *map)
 {
 	maps__insert(&self->maps[map->type], map);
@@ -178,10 +181,20 @@ struct symbol *map_groups__find_symbol_by_name(struct map_groups *self,
 					       symbol_filter_t filter);
 
 static inline
-struct symbol *map_groups__find_function(struct map_groups *self, u64 addr,
-					 struct map **mapp, symbol_filter_t filter)
+struct symbol *machine__find_kernel_symbol(struct machine *self,
+					   enum map_type type, u64 addr,
+					   struct map **mapp,
+					   symbol_filter_t filter)
+{
+	return map_groups__find_symbol(&self->kmaps, type, addr, mapp, filter);
+}
+
+static inline
+struct symbol *machine__find_kernel_function(struct machine *self, u64 addr,
+					     struct map **mapp,
+					     symbol_filter_t filter)
 {
-	return map_groups__find_symbol(self, MAP__FUNCTION, addr, mapp, filter);
+	return machine__find_kernel_symbol(self, MAP__FUNCTION, addr, mapp, filter);
 }
 
 static inline
@@ -197,10 +210,7 @@ int map_groups__fixup_overlappings(struct map_groups *self, struct map *map,
 
 struct map *map_groups__find_by_name(struct map_groups *self,
 				     enum map_type type, const char *name);
-struct map *map_groups__new_module(struct map_groups *self,
-				    u64 start,
-				    const char *filename,
-				    struct kernel_info *kerninfo);
+struct map *machine__new_module(struct machine *self, u64 start, const char *filename);
 
 void map_groups__flush(struct map_groups *self);
 
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 9ded38c..914c670 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -72,8 +72,7 @@ static int e_snprintf(char *str, size_t size, const char *format, ...)
 }
 
 static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
-static struct map_groups kmap_groups;
-static struct map *kmaps[MAP__NR_TYPES];
+static struct machine machine;
 
 /* Initialize symbol maps and path of vmlinux */
 static int init_vmlinux(void)
@@ -92,12 +91,15 @@ static int init_vmlinux(void)
 		goto out;
 	}
 
+	ret = machine__init(&machine, "/", 0);
+	if (ret < 0)
+		goto out;
+
 	kernel = dso__new_kernel(symbol_conf.vmlinux_name);
 	if (kernel == NULL)
 		die("Failed to create kernel dso.");
 
-	map_groups__init(&kmap_groups);
-	ret = __map_groups__create_kernel_maps(&kmap_groups, kmaps, kernel);
+	ret = __machine__create_kernel_maps(&machine, kernel);
 	if (ret < 0)
 		pr_debug("Failed to create kernel maps.\n");
 
@@ -110,12 +112,12 @@ out:
 #ifdef DWARF_SUPPORT
 static int open_vmlinux(void)
 {
-	if (map__load(kmaps[MAP__FUNCTION], NULL) < 0) {
+	if (map__load(machine.vmlinux_maps[MAP__FUNCTION], NULL) < 0) {
 		pr_debug("Failed to load kernel map.\n");
 		return -EINVAL;
 	}
-	pr_debug("Try to open %s\n", kmaps[MAP__FUNCTION]->dso->long_name);
-	return open(kmaps[MAP__FUNCTION]->dso->long_name, O_RDONLY);
+	pr_debug("Try to open %s\n", machine.vmlinux_maps[MAP__FUNCTION]->dso->long_name);
+	return open(machine.vmlinux_maps[MAP__FUNCTION]->dso->long_name, O_RDONLY);
 }
 
 /* Convert trace point to probe point with debuginfo */
@@ -125,7 +127,7 @@ static int convert_to_perf_probe_point(struct kprobe_trace_point *tp,
 	struct symbol *sym;
 	int fd, ret = -ENOENT;
 
-	sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION],
+	sym = map__find_symbol_by_name(machine.vmlinux_maps[MAP__FUNCTION],
 				       tp->symbol, NULL);
 	if (sym) {
 		fd = open_vmlinux();
@@ -1466,7 +1468,7 @@ static int convert_to_kprobe_trace_events(struct perf_probe_event *pev,
 	}
 
 	/* Currently just checking function name from symbol map */
-	sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION],
+	sym = map__find_symbol_by_name(machine.vmlinux_maps[MAP__FUNCTION],
 				       tev->point.symbol, NULL);
 	if (!sym) {
 		pr_warning("Kernel symbol \'%s\' not found.\n",
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index b7aade2..a8dd73e 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -69,12 +69,11 @@ void perf_session__update_sample_type(struct perf_session *self)
 
 int perf_session__create_kernel_maps(struct perf_session *self)
 {
-	int ret;
-	struct rb_root *root = &self->kerninfo_root;
+	struct rb_root *machines = &self->machines;
+	int ret = machines__create_kernel_maps(machines, HOST_KERNEL_ID);
 
-	ret = map_groups__create_kernel_maps(root, HOST_KERNEL_ID);
 	if (ret >= 0)
-		ret = map_groups__create_guest_kernel_maps(root);
+		ret = machines__create_guest_kernel_maps(machines);
 	return ret;
 }
 
@@ -97,7 +96,7 @@ struct perf_session *perf_session__new(const char *filename, int mode, bool forc
 	self->cwd = NULL;
 	self->cwdlen = 0;
 	self->unknown_events = 0;
-	self->kerninfo_root = RB_ROOT;
+	self->machines = RB_ROOT;
 	self->ordered_samples.flush_limit = ULLONG_MAX;
 	INIT_LIST_HEAD(&self->ordered_samples.samples_head);
 
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 796e229..61ca92e 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -25,7 +25,7 @@ struct perf_session {
 	unsigned long		mmap_window;
 	struct rb_root		threads;
 	struct thread		*last_match;
-	struct rb_root		kerninfo_root;
+	struct rb_root		machines;
 	struct events_stats	events_stats;
 	struct rb_root		stats_by_id;
 	unsigned long		event_total[PERF_RECORD_MAX];
@@ -102,4 +102,42 @@ int perf_session__browse_hists(struct rb_root *hists, u64 nr_hists,
 			       u64 session_total, const char *helpline,
 			       const char *input_name);
 #endif
+
+static inline
+struct machine *perf_session__find_host_machine(struct perf_session *self)
+{
+	return machines__find_host(&self->machines);
+}
+
+static inline
+struct machine *perf_session__find_machine(struct perf_session *self, pid_t pid)
+{
+	return machines__find(&self->machines, pid);
+}
+
+static inline
+struct machine *perf_session__findnew_machine(struct perf_session *self, pid_t pid)
+{
+	return machines__findnew(&self->machines, pid);
+}
+
+static inline
+void perf_session__process_machines(struct perf_session *self,
+				    machine__process_t process)
+{
+	return machines__process(&self->machines, process, self);
+}
+
+static inline
+size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
+{
+	return machines__fprintf_dsos(&self->machines, fp);
+}
+
+static inline
+size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
+					  bool with_hits)
+{
+	return machines__fprintf_dsos_buildid(&self->machines, fp, with_hits);
+}
 #endif /* __PERF_SESSION_H */
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index e77c33a..4c0146a 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -485,7 +485,7 @@ static int dso__split_kallsyms(struct dso *self, struct map *map,
 			       symbol_filter_t filter)
 {
 	struct map_groups *kmaps = map__kmap(map)->kmaps;
-	struct kernel_info *kerninfo = kmaps->this_kerninfo;
+	struct machine *machine = kmaps->machine;
 	struct map *curr_map = map;
 	struct symbol *pos;
 	int count = 0;
@@ -508,8 +508,8 @@ static int dso__split_kallsyms(struct dso *self, struct map *map,
 
 			if (strcmp(curr_map->dso->short_name, module)) {
 				if (curr_map != map &&
-					self->kernel == DSO_TYPE_GUEST_KERNEL &&
-					is_default_guest(kerninfo)) {
+				    self->kernel == DSO_TYPE_GUEST_KERNEL &&
+				    machine__is_default_guest(machine)) {
 					/*
 					 * We assume all symbols of a module are
 					 * continuous in * kallsyms, so curr_map
@@ -527,13 +527,13 @@ static int dso__split_kallsyms(struct dso *self, struct map *map,
 					pr_err("%s/proc/{kallsyms,modules} "
 					         "inconsistency while looking "
 						 "for \"%s\" module!\n",
-						 kerninfo->root_dir, module);
+						 machine->root_dir, module);
 					curr_map = map;
 					goto discard_symbol;
 				}
 
 				if (curr_map->dso->loaded &&
-					!is_default_guest(kmaps->this_kerninfo))
+				    !machine__is_default_guest(machine))
 					goto discard_symbol;
 			}
 			/*
@@ -586,7 +586,7 @@ discard_symbol:		rb_erase(&pos->rb_node, root);
 
 	if (curr_map != map &&
 	    self->kernel == DSO_TYPE_GUEST_KERNEL &&
-	    is_default_guest(kmaps->this_kerninfo)) {
+	    machine__is_default_guest(kmaps->machine)) {
 		dso__set_loaded(curr_map->dso, curr_map->type);
 	}
 
@@ -1291,7 +1291,7 @@ int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
 	char build_id_hex[BUILD_ID_SIZE * 2 + 1];
 	int ret = -1;
 	int fd;
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 	const char *root_dir;
 
 	dso__set_loaded(self, map->type);
@@ -1301,10 +1301,10 @@ int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
 	else if (self->kernel == DSO_TYPE_GUEST_KERNEL)
 		return dso__load_guest_kernel_sym(self, map, filter);
 
-	if (map->groups && map->groups->this_kerninfo)
-		kerninfo = map->groups->this_kerninfo;
+	if (map->groups && map->groups->machine)
+		machine = map->groups->machine;
 	else
-		kerninfo = NULL;
+		machine = NULL;
 
 	name = malloc(size);
 	if (!name)
@@ -1359,8 +1359,8 @@ more:
 			snprintf(name, size, "%s", self->long_name);
 			break;
 		case DSO__ORIG_GUEST_KMODULE:
-			if (map->groups && map->groups->this_kerninfo)
-				root_dir = map->groups->this_kerninfo->root_dir;
+			if (map->groups && map->groups->machine)
+				root_dir = map->groups->machine->root_dir;
 			else
 				root_dir = "";
 			snprintf(name, size, "%s%s", root_dir, self->long_name);
@@ -1528,21 +1528,20 @@ static char *get_kernel_version(const char *root_dir)
 	return strdup(name);
 }
 
-static int map_groups__set_modules_path(struct map_groups *self,
-				const char *root_dir)
+static int machine__set_modules_path(struct machine *self)
 {
 	char *version;
 	char modules_path[PATH_MAX];
 
-	version = get_kernel_version(root_dir);
+	version = get_kernel_version(self->root_dir);
 	if (!version)
 		return -1;
 
 	snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
-		 root_dir, version);
+		 self->root_dir, version);
 	free(version);
 
-	return map_groups__set_modules_path_dir(self, modules_path);
+	return map_groups__set_modules_path_dir(&self->kmaps, modules_path);
 }
 
 /*
@@ -1564,14 +1563,12 @@ static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
 	return self;
 }
 
-struct map *map_groups__new_module(struct map_groups *self, u64 start,
-				const char *filename,
-				struct kernel_info *kerninfo)
+struct map *machine__new_module(struct machine *self, u64 start,
+				const char *filename)
 {
 	struct map *map;
-	struct dso *dso;
+	struct dso *dso = __dsos__findnew(&self->kernel_dsos, filename);
 
-	dso = __dsos__findnew(&kerninfo->dsos__kernel, filename);
 	if (dso == NULL)
 		return NULL;
 
@@ -1579,28 +1576,27 @@ struct map *map_groups__new_module(struct map_groups *self, u64 start,
 	if (map == NULL)
 		return NULL;
 
-	if (is_host_kernel(kerninfo))
+	if (machine__is_host(self))
 		dso->origin = DSO__ORIG_KMODULE;
 	else
 		dso->origin = DSO__ORIG_GUEST_KMODULE;
-	map_groups__insert(self, map);
+	map_groups__insert(&self->kmaps, map);
 	return map;
 }
 
-static int map_groups__create_modules(struct kernel_info *kerninfo)
+static int machine__create_modules(struct machine *self)
 {
 	char *line = NULL;
 	size_t n;
 	FILE *file;
 	struct map *map;
-	const char *root_dir;
 	const char *modules;
 	char path[PATH_MAX];
 
-	if (is_default_guest(kerninfo))
+	if (machine__is_default_guest(self))
 		modules = symbol_conf.default_guest_modules;
 	else {
-		sprintf(path, "%s/proc/modules", kerninfo->root_dir);
+		sprintf(path, "%s/proc/modules", self->root_dir);
 		modules = path;
 	}
 
@@ -1608,8 +1604,6 @@ static int map_groups__create_modules(struct kernel_info *kerninfo)
 	if (file == NULL)
 		return -1;
 
-	root_dir = kerninfo->root_dir;
-
 	while (!feof(file)) {
 		char name[PATH_MAX];
 		u64 start;
@@ -1638,17 +1632,16 @@ static int map_groups__create_modules(struct kernel_info *kerninfo)
 		*sep = '\0';
 
 		snprintf(name, sizeof(name), "[%s]", line);
-		map = map_groups__new_module(&kerninfo->kmaps,
-				start, name, kerninfo);
+		map = machine__new_module(self, start, name);
 		if (map == NULL)
 			goto out_delete_line;
-		dso__kernel_module_get_build_id(map->dso, root_dir);
+		dso__kernel_module_get_build_id(map->dso, self->root_dir);
 	}
 
 	free(line);
 	fclose(file);
 
-	return map_groups__set_modules_path(&kerninfo->kmaps, root_dir);
+	return machine__set_modules_path(self);
 
 out_delete_line:
 	free(line);
@@ -1820,16 +1813,16 @@ static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
 {
 	int err;
 	const char *kallsyms_filename = NULL;
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 	char path[PATH_MAX];
 
 	if (!map->groups) {
 		pr_debug("Guest kernel map hasn't the point to groups\n");
 		return -1;
 	}
-	kerninfo = map->groups->this_kerninfo;
+	machine = map->groups->machine;
 
-	if (is_default_guest(kerninfo)) {
+	if (machine__is_default_guest(machine)) {
 		/*
 		 * if the user specified a vmlinux filename, use it and only
 		 * it, reporting errors to the user if it cannot be used.
@@ -1845,7 +1838,7 @@ static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
 		if (!kallsyms_filename)
 			return -1;
 	} else {
-		sprintf(path, "%s/proc/kallsyms", kerninfo->root_dir);
+		sprintf(path, "%s/proc/kallsyms", machine->root_dir);
 		kallsyms_filename = path;
 	}
 
@@ -1856,9 +1849,8 @@ static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
 out_try_fixup:
 	if (err > 0) {
 		if (kallsyms_filename != NULL) {
-			kern_mmap_name(kerninfo, path);
-			dso__set_long_name(self,
-				strdup(path));
+			machine__mmap_name(machine, path, sizeof(path));
+			dso__set_long_name(self, strdup(path));
 		}
 		map__fixup_start(map);
 		map__fixup_end(map);
@@ -1897,27 +1889,32 @@ struct dso *__dsos__findnew(struct list_head *head, const char *name)
 	return dso;
 }
 
-static void __dsos__fprintf(struct list_head *head, FILE *fp)
+static size_t __dsos__fprintf(struct list_head *head, FILE *fp)
 {
 	struct dso *pos;
+	size_t ret = 0;
 
 	list_for_each_entry(pos, head, node) {
 		int i;
 		for (i = 0; i < MAP__NR_TYPES; ++i)
-			dso__fprintf(pos, i, fp);
+			ret += dso__fprintf(pos, i, fp);
 	}
+
+	return ret;
 }
 
-void dsos__fprintf(struct rb_root *kerninfo_root, FILE *fp)
+size_t machines__fprintf_dsos(struct rb_root *self, FILE *fp)
 {
 	struct rb_node *nd;
+	size_t ret = 0;
 
-	for (nd = rb_first(kerninfo_root); nd; nd = rb_next(nd)) {
-		struct kernel_info *pos = rb_entry(nd, struct kernel_info,
-				rb_node);
-		__dsos__fprintf(&pos->dsos__kernel, fp);
-		__dsos__fprintf(&pos->dsos__user, fp);
+	for (nd = rb_first(self); 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);
 	}
+
+	return ret;
 }
 
 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
@@ -1935,19 +1932,15 @@ static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
 	return ret;
 }
 
-size_t dsos__fprintf_buildid(struct rb_root *kerninfo_root,
-		FILE *fp, bool with_hits)
+size_t machines__fprintf_dsos_buildid(struct rb_root *self, FILE *fp, bool with_hits)
 {
 	struct rb_node *nd;
 	size_t ret = 0;
 
-	for (nd = rb_first(kerninfo_root); nd; nd = rb_next(nd)) {
-		struct kernel_info *pos = rb_entry(nd, struct kernel_info,
-				rb_node);
-		ret += __dsos__fprintf_buildid(&pos->dsos__kernel,
-					fp, with_hits);
-		ret += __dsos__fprintf_buildid(&pos->dsos__user,
-					fp, with_hits);
+	for (nd = rb_first(self); nd; nd = rb_next(nd)) {
+		struct machine *pos = rb_entry(nd, struct machine, rb_node);
+		ret += __dsos__fprintf_buildid(&pos->kernel_dsos, fp, with_hits);
+		ret += __dsos__fprintf_buildid(&pos->user_dsos, fp, with_hits);
 	}
 	return ret;
 }
@@ -1964,14 +1957,12 @@ struct dso *dso__new_kernel(const char *name)
 	return self;
 }
 
-static struct dso *dso__new_guest_kernel(struct kernel_info *kerninfo,
+static struct dso *dso__new_guest_kernel(struct machine *machine,
 					const char *name)
 {
-	char buff[PATH_MAX];
-	struct dso *self;
+	char bf[PATH_MAX];
+	struct dso *self = dso__new(name ?: machine__mmap_name(machine, bf, sizeof(bf)));
 
-	kern_mmap_name(kerninfo, buff);
-	self = dso__new(name ?: buff);
 	if (self != NULL) {
 		dso__set_short_name(self, "[guest.kernel]");
 		self->kernel = DSO_TYPE_GUEST_KERNEL;
@@ -1980,64 +1971,78 @@ static struct dso *dso__new_guest_kernel(struct kernel_info *kerninfo,
 	return self;
 }
 
-void dso__read_running_kernel_build_id(struct dso *self,
-			struct kernel_info *kerninfo)
+void dso__read_running_kernel_build_id(struct dso *self, struct machine *machine)
 {
 	char path[PATH_MAX];
 
-	if (is_default_guest(kerninfo))
+	if (machine__is_default_guest(machine))
 		return;
-	sprintf(path, "%s/sys/kernel/notes", kerninfo->root_dir);
+	sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
 	if (sysfs__read_build_id(path, self->build_id,
 				 sizeof(self->build_id)) == 0)
 		self->has_build_id = true;
 }
 
-static struct dso *dsos__create_kernel(struct kernel_info *kerninfo)
+static struct dso *machine__create_kernel(struct machine *self)
 {
 	const char *vmlinux_name = NULL;
 	struct dso *kernel;
 
-	if (is_host_kernel(kerninfo)) {
+	if (machine__is_host(self)) {
 		vmlinux_name = symbol_conf.vmlinux_name;
 		kernel = dso__new_kernel(vmlinux_name);
 	} else {
-		if (is_default_guest(kerninfo))
+		if (machine__is_default_guest(self))
 			vmlinux_name = symbol_conf.default_guest_vmlinux_name;
-		kernel = dso__new_guest_kernel(kerninfo, vmlinux_name);
+		kernel = dso__new_guest_kernel(self, vmlinux_name);
 	}
 
 	if (kernel != NULL) {
-		dso__read_running_kernel_build_id(kernel, kerninfo);
-		dsos__add(&kerninfo->dsos__kernel, kernel);
+		dso__read_running_kernel_build_id(kernel, self);
+		dsos__add(&self->kernel_dsos, kernel);
 	}
 	return kernel;
 }
 
-int __map_groups__create_kernel_maps(struct map_groups *self,
-				     struct map *vmlinux_maps[MAP__NR_TYPES],
-				     struct dso *kernel)
+int __machine__create_kernel_maps(struct machine *self, struct dso *kernel)
 {
 	enum map_type type;
 
 	for (type = 0; type < MAP__NR_TYPES; ++type) {
 		struct kmap *kmap;
 
-		vmlinux_maps[type] = map__new2(0, kernel, type);
-		if (vmlinux_maps[type] == NULL)
+		self->vmlinux_maps[type] = map__new2(0, kernel, type);
+		if (self->vmlinux_maps[type] == NULL)
 			return -1;
 
-		vmlinux_maps[type]->map_ip =
-			vmlinux_maps[type]->unmap_ip = identity__map_ip;
+		self->vmlinux_maps[type]->map_ip =
+			self->vmlinux_maps[type]->unmap_ip = identity__map_ip;
 
-		kmap = map__kmap(vmlinux_maps[type]);
-		kmap->kmaps = self;
-		map_groups__insert(self, vmlinux_maps[type]);
+		kmap = map__kmap(self->vmlinux_maps[type]);
+		kmap->kmaps = &self->kmaps;
+		map_groups__insert(&self->kmaps, self->vmlinux_maps[type]);
 	}
 
 	return 0;
 }
 
+int machine__create_kernel_maps(struct machine *self)
+{
+	struct dso *kernel = machine__create_kernel(self);
+
+	if (kernel == NULL ||
+	    __machine__create_kernel_maps(self, kernel) < 0)
+		return -1;
+
+	if (symbol_conf.use_modules && machine__create_modules(self) < 0)
+		pr_debug("Problems creating module maps, continuing anyway...\n");
+	/*
+	 * Now that we have all the maps created, just set the ->end of them:
+	 */
+	map_groups__fixup_end(&self->kmaps);
+	return 0;
+}
+
 static void vmlinux_path__exit(void)
 {
 	while (--vmlinux_path__nr_entries >= 0) {
@@ -2154,30 +2159,14 @@ out_free_comm_list:
 	return -1;
 }
 
-int map_groups__create_kernel_maps(struct rb_root *kerninfo_root, pid_t pid)
+int machines__create_kernel_maps(struct rb_root *self, pid_t pid)
 {
-	struct kernel_info *kerninfo;
-	struct dso *kernel;
-
-	kerninfo = kerninfo__findnew(kerninfo_root, pid);
-	if (kerninfo == NULL)
-		return -1;
-	kernel = dsos__create_kernel(kerninfo);
-	if (kernel == NULL)
-		return -1;
+	struct machine *machine = machines__findnew(self, pid);
 
-	if (__map_groups__create_kernel_maps(&kerninfo->kmaps,
-			kerninfo->vmlinux_maps, kernel) < 0)
+	if (machine == NULL)
 		return -1;
 
-	if (symbol_conf.use_modules &&
-		map_groups__create_modules(kerninfo) < 0)
-		pr_debug("Problems creating module maps, continuing anyway...\n");
-	/*
-	 * Now that we have all the maps created, just set the ->end of them:
-	 */
-	map_groups__fixup_end(&kerninfo->kmaps);
-	return 0;
+	return machine__create_kernel_maps(machine);
 }
 
 static int hex(char ch)
@@ -2223,7 +2212,7 @@ char *strxfrchar(char *s, char from, char to)
 	return s;
 }
 
-int map_groups__create_guest_kernel_maps(struct rb_root *kerninfo_root)
+int machines__create_guest_kernel_maps(struct rb_root *self)
 {
 	int ret = 0;
 	struct dirent **namelist = NULL;
@@ -2234,8 +2223,7 @@ int map_groups__create_guest_kernel_maps(struct rb_root *kerninfo_root)
 	if (symbol_conf.default_guest_vmlinux_name ||
 	    symbol_conf.default_guest_modules ||
 	    symbol_conf.default_guest_kallsyms) {
-		map_groups__create_kernel_maps(kerninfo_root,
-					DEFAULT_GUEST_KERNEL_ID);
+		machines__create_kernel_maps(self, DEFAULT_GUEST_KERNEL_ID);
 	}
 
 	if (symbol_conf.guestmount) {
@@ -2256,8 +2244,7 @@ int map_groups__create_guest_kernel_maps(struct rb_root *kerninfo_root)
 				pr_debug("Can't access file %s\n", path);
 				goto failure;
 			}
-			map_groups__create_kernel_maps(kerninfo_root,
-							pid);
+			machines__create_kernel_maps(self, pid);
 		}
 failure:
 		free(namelist);
@@ -2265,3 +2252,36 @@ failure:
 
 	return ret;
 }
+
+int machine__load_kallsyms(struct machine *self, const char *filename,
+			   enum map_type type, symbol_filter_t filter)
+{
+	struct map *map = self->vmlinux_maps[type];
+	int ret = dso__load_kallsyms(map->dso, filename, map, filter);
+
+	if (ret > 0) {
+		dso__set_loaded(map->dso, type);
+		/*
+		 * Since /proc/kallsyms will have multiple sessions for the
+		 * kernel, with modules between them, fixup the end of all
+		 * sections.
+		 */
+		__map_groups__fixup_end(&self->kmaps, type);
+	}
+
+	return ret;
+}
+
+int machine__load_vmlinux_path(struct machine *self, enum map_type type,
+			       symbol_filter_t filter)
+{
+	struct map *map = self->vmlinux_maps[type];
+	int ret = dso__load_vmlinux_path(map->dso, map, filter);
+
+	if (ret > 0) {
+		dso__set_loaded(map->dso, type);
+		map__reloc_vmlinux(map);
+	}
+
+	return ret;
+}
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 478f5ab..a517c17 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -162,9 +162,13 @@ int dso__load_vmlinux_path(struct dso *self, struct map *map,
 			   symbol_filter_t filter);
 int dso__load_kallsyms(struct dso *self, const char *filename, struct map *map,
 		       symbol_filter_t filter);
-void dsos__fprintf(struct rb_root *kerninfo_root, FILE *fp);
-size_t dsos__fprintf_buildid(struct rb_root *kerninfo_root,
-		FILE *fp, bool with_hits);
+int machine__load_kallsyms(struct machine *self, const char *filename,
+			   enum map_type type, symbol_filter_t filter);
+int machine__load_vmlinux_path(struct machine *self, enum map_type type,
+			       symbol_filter_t filter);
+
+size_t machines__fprintf_dsos(struct rb_root *self, FILE *fp);
+size_t machines__fprintf_dsos_buildid(struct rb_root *self, FILE *fp, bool with_hits);
 
 size_t dso__fprintf_buildid(struct dso *self, FILE *fp);
 size_t dso__fprintf(struct dso *self, enum map_type type, FILE *fp);
@@ -186,8 +190,7 @@ enum dso_origin {
 char dso__symtab_origin(const struct dso *self);
 void dso__set_long_name(struct dso *self, char *name);
 void dso__set_build_id(struct dso *self, void *build_id);
-void dso__read_running_kernel_build_id(struct dso *self,
-		struct kernel_info *kerninfo);
+void dso__read_running_kernel_build_id(struct dso *self, struct machine *machine);
 struct symbol *dso__find_symbol(struct dso *self, enum map_type type, u64 addr);
 struct symbol *dso__find_symbol_by_name(struct dso *self, enum map_type type,
 					const char *name);
@@ -200,11 +203,11 @@ int kallsyms__parse(const char *filename, void *arg,
 		    int (*process_symbol)(void *arg, const char *name,
 					  char type, u64 start));
 
-int __map_groups__create_kernel_maps(struct map_groups *self,
-			struct map *vmlinux_maps[MAP__NR_TYPES],
-			struct dso *kernel);
-int map_groups__create_kernel_maps(struct rb_root *kerninfo_root, pid_t pid);
-int map_groups__create_guest_kernel_maps(struct rb_root *kerninfo_root);
+int __machine__create_kernel_maps(struct machine *self, struct dso *kernel);
+int machine__create_kernel_maps(struct machine *self);
+
+int machines__create_kernel_maps(struct rb_root *self, pid_t pid);
+int machines__create_guest_kernel_maps(struct rb_root *self);
 
 int symbol__init(void);
 bool symbol_type__is_a(char symbol_type, enum map_type map_type);