18 files changed, 134 insertions, 118 deletions
diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index 795f865c136..e44c54c79be 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -463,7 +463,7 @@ static struct perf_event_ops event_ops = {
 static int __cmd_annotate(void)
 {
        struct perf_session *session = perf_session__new(input_name, O_RDONLY,
-                                                         force);
+                                                         force, &symbol_conf);
        int ret;
        if (session == NULL)
diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c
index 2629f76d95f..7c36e4b2ecc 100644
--- a/tools/perf/builtin-buildid-list.c
+++ b/tools/perf/builtin-buildid-list.c
@@ -54,8 +54,8 @@ static int perf_file_section__process_buildids(struct perf_file_section *self,
 static int __cmd_buildid_list(void)
 {
        int err = -1;
-        struct perf_session *session = perf_session__new(input_name, O_RDONLY, force);
+        struct perf_session *session = perf_session__new(input_name, O_RDONLY,
+                                                         force, NULL);
        if (session == NULL)
                return -1;
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index de194958fe6..e79ecbc1718 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -364,19 +364,6 @@ static struct perf_event_ops event_ops = {
        .sample_type_check      = sample_type_check,
 };
-static int read_events(void)
-{
-        int err;
-        struct perf_session *session = perf_session__new(input_name, O_RDONLY, 0);
-        if (session == NULL)
-                return -ENOMEM;
-        err = perf_session__process_events(session, &event_ops);
-        perf_session__delete(session);
-        return err;
-}
 static double fragmentation(unsigned long n_req, unsigned long n_alloc)
 {
        if (n_alloc == 0)
@@ -385,7 +372,8 @@ static double fragmentation(unsigned long n_req, unsigned long n_alloc)
                return 100.0 - (100.0 * n_req / n_alloc);
 }
-static void __print_result(struct rb_root *root, int n_lines, int is_caller)
+static void __print_result(struct rb_root *root, struct perf_session *session,
+                           int n_lines, int is_caller)
 {
        struct rb_node *next;
@@ -406,7 +394,7 @@ static void __print_result(struct rb_root *root, int n_lines, int is_caller)
                if (is_caller) {
                        addr = data->call_site;
                        if (!raw_ip)
-                                sym = map_groups__find_function(kmaps, addr, NULL);
+                                sym = map_groups__find_function(&session->kmaps, session, addr, NULL);
                } else
                        addr = data->ptr;
@@ -447,12 +435,12 @@ static void print_summary(void)
        printf("Cross CPU allocations: %lu/%lu\n", nr_cross_allocs, nr_allocs);
 }
-static void print_result(void)
+static void print_result(struct perf_session *session)
 {
        if (caller_flag)
-                __print_result(&root_caller_sorted, caller_lines, 1);
+                __print_result(&root_caller_sorted, session, caller_lines, 1);
        if (alloc_flag)
-                __print_result(&root_alloc_sorted, alloc_lines, 0);
+                __print_result(&root_alloc_sorted, session, alloc_lines, 0);
        print_summary();
 }
@@ -520,12 +508,21 @@ static void sort_result(void)
 static int __cmd_kmem(void)
 {
+        int err;
+        struct perf_session *session = perf_session__new(input_name, O_RDONLY,
+                                                         0, NULL);
+        if (session == NULL)
+                return -ENOMEM;
        setup_pager();
-        read_events();
+        err = perf_session__process_events(session, &event_ops);
+        if (err != 0)
+                goto out_delete;
        sort_result();
-        print_result();
+        print_result(session);
+out_delete:
-        return 0;
+        perf_session__delete(session);
+        return err;
 }
 static const char * const kmem_usage[] = {
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index b7e15a1b1ec..a66a58d5281 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -442,7 +442,7 @@ static int __cmd_record(int argc, const char **argv)
                exit(-1);
        }
-        session = perf_session__new(output_name, O_WRONLY, force);
+        session = perf_session__new(output_name, O_WRONLY, force, NULL);
        if (session == NULL) {
                pr_err("Not enough memory for reading perf file header\n");
                return -1;
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index efa8147b899..3487224670a 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -414,6 +414,7 @@ static int call__match(struct symbol *sym)
 }
 static struct symbol **resolve_callchain(struct thread *thread,
+                                         struct perf_session *session,
                                         struct ip_callchain *chain,
                                         struct symbol **parent)
 {
@@ -447,8 +448,8 @@ static struct symbol **resolve_callchain(struct thread *thread,
                        continue;
                }
-                thread__find_addr_location(thread, cpumode, MAP__FUNCTION,
+                thread__find_addr_location(thread, session, cpumode,
-                                           ip, &al, NULL);
+                                           MAP__FUNCTION, ip, &al, NULL);
                if (al.sym != NULL) {
                        if (sort__has_parent && !*parent &&
                            call__match(al.sym))
@@ -467,6 +468,7 @@ static struct symbol **resolve_callchain(struct thread *thread,
 */
 static int hist_entry__add(struct addr_location *al,
+                           struct perf_session *session,
                           struct ip_callchain *chain, u64 count)
 {
        struct symbol **syms = NULL, *parent = NULL;
@@ -474,7 +476,7 @@ static int hist_entry__add(struct addr_location *al,
        struct hist_entry *he;
        if ((sort__has_parent || callchain) && chain)
-                syms = resolve_callchain(al->thread, chain, &parent);
+                syms = resolve_callchain(al->thread, session, chain, &parent);
        he = __hist_entry__add(al, parent, count, &hit);
        if (he == NULL)
@@ -650,7 +652,7 @@ static int process_sample_event(event_t *event, struct perf_session *session)
        cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
-        thread__find_addr_location(thread, cpumode,
+        thread__find_addr_location(thread, session, cpumode,
                                   MAP__FUNCTION, data.ip, &al, NULL);
        /*
         * We have to do this here as we may have a dso with no symbol hit that
@@ -669,7 +671,7 @@ static int process_sample_event(event_t *event, struct perf_session *session)
        if (sym_list && al.sym && !strlist__has_entry(sym_list, al.sym->name))
                return 0;
-        if (hist_entry__add(&al, data.callchain, data.period)) {
+        if (hist_entry__add(&al, session, data.callchain, data.period)) {
                pr_debug("problem incrementing symbol count, skipping event\n");
                return -1;
        }
@@ -763,7 +765,7 @@ static int __cmd_report(void)
        int ret;
        struct perf_session *session;
-        session = perf_session__new(input_name, O_RDONLY, force);
+        session = perf_session__new(input_name, O_RDONLY, force, &symbol_conf);
        if (session == NULL)
                return -ENOMEM;
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 8d58d9e07a7..bce05dff6df 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1679,8 +1679,8 @@ static struct perf_event_ops event_ops = {
 static int read_events(void)
 {
        int err;
-        struct perf_session *session = perf_session__new(input_name, O_RDONLY, 0);
+        struct perf_session *session = perf_session__new(input_name, O_RDONLY,
+                                                         0, NULL);
        if (session == NULL)
                return -ENOMEM;
diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index b5211facddc..27018531404 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -1056,7 +1056,8 @@ static struct perf_event_ops event_ops = {
 static int __cmd_timechart(void)
 {
-        struct perf_session *session = perf_session__new(input_name, O_RDONLY, 0);
+        struct perf_session *session = perf_session__new(input_name, O_RDONLY,
+                                                         0, NULL);
        int ret;
        if (session == NULL)
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 0f7a4da2924..3b212bb2e4d 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1162,8 +1162,8 @@ static int __cmd_top(void)
         * FIXME: perf_session__new should allow passing a O_MMAP, so that all this
         * mmap reading, etc is encapsulated in it. Use O_WRONLY for now.
         */
-        struct perf_session *session = perf_session__new(NULL, O_WRONLY, false);
+        struct perf_session *session = perf_session__new(NULL, O_WRONLY, false,
+                                                         &symbol_conf);
        if (session == NULL)
                return -ENOMEM;
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index d7653237505..9d89ae423ca 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -318,7 +318,7 @@ int cmd_trace(int argc, const char **argv, const char *prefix __used)
        setup_pager();
-        session = perf_session__new(input_name, O_RDONLY, 0);
+        session = perf_session__new(input_name, O_RDONLY, 0, NULL);
        if (session == NULL)
                return -ENOMEM;
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 2d09c29b3a6..222efb1fc3b 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -256,7 +256,8 @@ int event__process_task(event_t *self, struct perf_session *session)
        return 0;
 }
-void thread__find_addr_location(struct thread *self, u8 cpumode,
+void thread__find_addr_location(struct thread *self,
+                                struct perf_session *session, u8 cpumode,
                                enum map_type type, u64 addr,
                                struct addr_location *al,
                                symbol_filter_t filter)
@@ -268,7 +269,7 @@ void thread__find_addr_location(struct thread *self, u8 cpumode,
        if (cpumode & PERF_RECORD_MISC_KERNEL) {
                al->level = 'k';
-                mg = kmaps;
+                mg = &session->kmaps;
        } else if (cpumode & PERF_RECORD_MISC_USER)
                al->level = '.';
        else {
@@ -289,14 +290,14 @@ try_again:
                 * "[vdso]" dso, but for now lets use the old trick of looking
                 * in the whole kernel symbol list.
                 */
-                if ((long long)al->addr < 0 && mg != kmaps) {
+                if ((long long)al->addr < 0 && mg != &session->kmaps) {
-                        mg = kmaps;
+                        mg = &session->kmaps;
                        goto try_again;
                }
                al->sym = NULL;
        } else {
                al->addr = al->map->map_ip(al->map, al->addr);
-                al->sym = map__find_symbol(al->map, al->addr, filter);
+                al->sym = map__find_symbol(al->map, session, al->addr, filter);
        }
 }
@@ -311,7 +312,7 @@ int event__preprocess_sample(const event_t *self, struct perf_session *session,
        dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
-        thread__find_addr_location(thread, cpumode, MAP__FUNCTION,
+        thread__find_addr_location(thread, session, cpumode, MAP__FUNCTION,
                                   self->ip.ip, al, filter);
        dump_printf(" ...... dso: %s\n",
                    al->map ? al->map->dso->long_name :
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index bb090257570..035ecf3c25c 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -149,15 +149,17 @@ void map__delete(struct map *self);
 struct map *map__clone(struct map *self);
 int map__overlap(struct map *l, struct map *r);
 size_t map__fprintf(struct map *self, FILE *fp);
-struct symbol *map__find_symbol(struct map *self, u64 addr,
-                                symbol_filter_t filter);
+struct perf_session;
+struct symbol *map__find_symbol(struct map *self, struct perf_session *session,
+                                u64 addr, symbol_filter_t filter);
 struct symbol *map__find_symbol_by_name(struct map *self, const char *name,
+                                        struct perf_session *session,
                                        symbol_filter_t filter);
 void map__fixup_start(struct map *self);
 void map__fixup_end(struct map *self);
-struct perf_session;
 int event__synthesize_thread(pid_t pid,
                             int (*process)(event_t *event,
                                            struct perf_session *session),
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 76bdca640a9..8b3dd467adb 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -104,10 +104,11 @@ void map__fixup_end(struct map *self)
 #define DSO__DELETED "(deleted)"
-static int map__load(struct map *self, symbol_filter_t filter)
+static int map__load(struct map *self, struct perf_session *session,
+                     symbol_filter_t filter)
 {
        const char *name = self->dso->long_name;
-        int nr = dso__load(self->dso, self, filter);
+        int nr = dso__load(self->dso, self, session, filter);
        if (nr < 0) {
                if (self->dso->has_build_id) {
@@ -143,19 +144,20 @@ static int map__load(struct map *self, symbol_filter_t filter)
        return 0;
 }
-struct symbol *map__find_symbol(struct map *self, u64 addr,
+struct symbol *map__find_symbol(struct map *self, struct perf_session *session,
-                                symbol_filter_t filter)
+                                u64 addr, symbol_filter_t filter)
 {
-        if (!dso__loaded(self->dso, self->type) && map__load(self, filter) < 0)
+        if (!dso__loaded(self->dso, self->type) && map__load(self, session, filter) < 0)
                return NULL;
        return dso__find_symbol(self->dso, self->type, addr);
 }
 struct symbol *map__find_symbol_by_name(struct map *self, const char *name,
+                                        struct perf_session *session,
                                        symbol_filter_t filter)
 {
-        if (!dso__loaded(self->dso, self->type) && map__load(self, filter) < 0)
+        if (!dso__loaded(self->dso, self->type) && map__load(self, session, filter) < 0)
                return NULL;
        if (!dso__sorted_by_name(self->dso, self->type))
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 09836a537fc..fe87a2f2e5a 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -49,7 +49,7 @@ out_close:
 }
 struct perf_session *perf_session__new(const char *filename, int mode,
-                                       bool force)
+                                       bool force, struct symbol_conf *conf)
 {
        size_t len = filename ? strlen(filename) + 1 : 0;
        struct perf_session *self = zalloc(sizeof(*self) + len);
@@ -58,7 +58,7 @@ struct perf_session *perf_session__new(const char *filename, int mode,
                goto out;
        if (perf_header__init(&self->header) < 0)
-                goto out_delete;
+                goto out_free;
        memcpy(self->filename, filename, len);
        self->threads = RB_ROOT;
@@ -66,16 +66,21 @@ struct perf_session *perf_session__new(const char *filename, int mode,
        self->mmap_window = 32;
        self->cwd = NULL;
        self->cwdlen = 0;
+        map_groups__init(&self->kmaps);
-        if (mode == O_RDONLY && perf_session__open(self, force) < 0) {
+        if (perf_session__create_kernel_maps(self, conf) < 0)
-                perf_session__delete(self);
+                goto out_delete;
-                self = NULL;
-        }
+        if (mode == O_RDONLY && perf_session__open(self, force) < 0)
+                goto out_delete;
 out:
        return self;
-out_delete:
+out_free:
        free(self);
        return NULL;
+out_delete:
+        perf_session__delete(self);
+        return NULL;
 }
 void perf_session__delete(struct perf_session *self)
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 1dbef7cdd48..20b2c9cc834 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -3,19 +3,23 @@
 #include "event.h"
 #include "header.h"
+#include "thread.h"
 #include <linux/rbtree.h>
 struct thread;
+struct symbol_conf;
 struct perf_session {
        struct perf_header      header;
        unsigned long           size;
        unsigned long           mmap_window;
+        struct map_groups       kmaps;
        struct rb_root          threads;
        struct thread           *last_match;
        int                     fd;
        int                     cwdlen;
        char                    *cwd;
+        bool                    use_modules;
        char filename[0];
 };
@@ -37,7 +41,7 @@ struct perf_event_ops {
 };
 struct perf_session *perf_session__new(const char *filename, int mode,
-                                       bool force);
+                                       bool force, struct symbol_conf *conf);
 void perf_session__delete(struct perf_session *self);
 int perf_session__process_events(struct perf_session *self,
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index d3d9fed74f1..185b9eec192 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1,5 +1,6 @@
 #include "util.h"
 #include "../perf.h"
+#include "session.h"
 #include "string.h"
 #include "symbol.h"
 #include "thread.h"
@@ -31,7 +32,7 @@ enum dso_origin {
 static void dsos__add(struct list_head *head, struct dso *dso);
 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
 static int dso__load_kernel_sym(struct dso *self, struct map *map,
-                                struct map_groups *mg, symbol_filter_t filter);
+                                struct perf_session *session, symbol_filter_t filter);
 unsigned int symbol__priv_size;
 static int vmlinux_path__nr_entries;
 static char **vmlinux_path;
@@ -41,9 +42,6 @@ static struct symbol_conf symbol_conf__defaults = {
        .try_vmlinux_path = true,
 };
-static struct map_groups kmaps_mem;
-struct map_groups *kmaps = &kmaps_mem;
 bool dso__loaded(const struct dso *self, enum map_type type)
 {
        return self->loaded & (1 << type);
@@ -456,7 +454,7 @@ out_failure:
 * the original ELF section names vmlinux have.
 */
 static int dso__split_kallsyms(struct dso *self, struct map *map,
-                               struct map_groups *mg, symbol_filter_t filter)
+                               struct perf_session *session, symbol_filter_t filter)
 {
        struct map *curr_map = map;
        struct symbol *pos;
@@ -473,13 +471,13 @@ static int dso__split_kallsyms(struct dso *self, struct map *map,
                module = strchr(pos->name, '\t');
                if (module) {
-                        if (!mg->use_modules)
+                        if (!session->use_modules)
                                goto discard_symbol;
                        *module++ = '\0';
                        if (strcmp(self->name, module)) {
-                                curr_map = map_groups__find_by_name(mg, map->type, module);
+                                curr_map = map_groups__find_by_name(&session->kmaps, map->type, module);
                                if (curr_map == NULL) {
                                        pr_debug("/proc/{kallsyms,modules} "
                                                 "inconsistency!\n");
@@ -510,7 +508,7 @@ static int dso__split_kallsyms(struct dso *self, struct map *map,
                        }
                        curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
-                        map_groups__insert(mg, curr_map);
+                        map_groups__insert(&session->kmaps, curr_map);
                        ++kernel_range;
                }
@@ -531,7 +529,7 @@ discard_symbol:		rb_erase(&pos->rb_node, root);
 static int dso__load_kallsyms(struct dso *self, struct map *map,
-                              struct map_groups *mg, symbol_filter_t filter)
+                              struct perf_session *session, symbol_filter_t filter)
 {
        if (dso__load_all_kallsyms(self, map) < 0)
                return -1;
@@ -539,14 +537,7 @@ static int dso__load_kallsyms(struct dso *self, struct map *map,
        symbols__fixup_end(&self->symbols[map->type]);
        self->origin = DSO__ORIG_KERNEL;
-        return dso__split_kallsyms(self, map, mg, filter);
+        return dso__split_kallsyms(self, map, session, filter);
-}
-size_t kernel_maps__fprintf(FILE *fp)
-{
-        size_t printed = fprintf(fp, "Kernel maps:\n");
-        printed += map_groups__fprintf_maps(kmaps, fp);
-        return printed + fprintf(fp, "END kernel maps\n");
 }
 static int dso__load_perf_map(struct dso *self, struct map *map,
@@ -873,7 +864,7 @@ static bool elf_sec__is_a(GElf_Shdr *self, Elf_Data *secstrs, enum map_type type
 }
 static int dso__load_sym(struct dso *self, struct map *map,
-                         struct map_groups *mg, const char *name, int fd,
+                         struct perf_session *session, const char *name, int fd,
                         symbol_filter_t filter, int kernel, int kmodule)
 {
        struct map *curr_map = map;
@@ -977,7 +968,7 @@ static int dso__load_sym(struct dso *self, struct map *map,
                        snprintf(dso_name, sizeof(dso_name),
                                 "%s%s", self->short_name, section_name);
-                        curr_map = map_groups__find_by_name(mg, map->type, dso_name);
+                        curr_map = map_groups__find_by_name(&session->kmaps, map->type, dso_name);
                        if (curr_map == NULL) {
                                u64 start = sym.st_value;
@@ -996,7 +987,7 @@ static int dso__load_sym(struct dso *self, struct map *map,
                                curr_map->map_ip = identity__map_ip;
                                curr_map->unmap_ip = identity__map_ip;
                                curr_dso->origin = DSO__ORIG_KERNEL;
-                                map_groups__insert(kmaps, curr_map);
+                                map_groups__insert(&session->kmaps, curr_map);
                                dsos__add(&dsos__kernel, curr_dso);
                        } else
                                curr_dso = curr_map->dso;
@@ -1211,7 +1202,8 @@ char dso__symtab_origin(const struct dso *self)
        return origin[self->origin];
 }
-int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
+int dso__load(struct dso *self, struct map *map, struct perf_session *session,
+              symbol_filter_t filter)
 {
        int size = PATH_MAX;
        char *name;
@@ -1222,7 +1214,7 @@ int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
        dso__set_loaded(self, map->type);
        if (self->kernel)
-                return dso__load_kernel_sym(self, map, kmaps, filter);
+                return dso__load_kernel_sym(self, map, session, filter);
        name = malloc(size);
        if (!name)
@@ -1323,7 +1315,7 @@ struct map *map_groups__find_by_name(struct map_groups *self,
        return NULL;
 }
-static int dsos__set_modules_path_dir(char *dirname)
+static int perf_session__set_modules_path_dir(struct perf_session *self, char *dirname)
 {
        struct dirent *dent;
        DIR *dir = opendir(dirname);
@@ -1343,7 +1335,7 @@ static int dsos__set_modules_path_dir(char *dirname)
                        snprintf(path, sizeof(path), "%s/%s",
                                 dirname, dent->d_name);
-                        if (dsos__set_modules_path_dir(path) < 0)
+                        if (perf_session__set_modules_path_dir(self, path) < 0)
                                goto failure;
                } else {
                        char *dot = strrchr(dent->d_name, '.'),
@@ -1357,7 +1349,7 @@ static int dsos__set_modules_path_dir(char *dirname)
                                 (int)(dot - dent->d_name), dent->d_name);
                        strxfrchar(dso_name, '-', '_');
-                        map = map_groups__find_by_name(kmaps, MAP__FUNCTION, dso_name);
+                        map = map_groups__find_by_name(&self->kmaps, MAP__FUNCTION, dso_name);
                        if (map == NULL)
                                continue;
@@ -1377,7 +1369,7 @@ failure:
        return -1;
 }
-static int dsos__set_modules_path(void)
+static int perf_session__set_modules_path(struct perf_session *self)
 {
        struct utsname uts;
        char modules_path[PATH_MAX];
@@ -1388,7 +1380,7 @@ static int dsos__set_modules_path(void)
        snprintf(modules_path, sizeof(modules_path), "/lib/modules/%s/kernel",
                 uts.release);
-        return dsos__set_modules_path_dir(modules_path);
+        return perf_session__set_modules_path_dir(self, modules_path);
 }
 /*
@@ -1410,7 +1402,7 @@ static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
        return self;
 }
-static int map_groups__create_module_maps(struct map_groups *self)
+static int perf_session__create_module_maps(struct perf_session *self)
 {
        char *line = NULL;
        size_t n;
@@ -1467,14 +1459,14 @@ static int map_groups__create_module_maps(struct map_groups *self)
                        dso->has_build_id = true;
                dso->origin = DSO__ORIG_KMODULE;
-                map_groups__insert(self, map);
+                map_groups__insert(&self->kmaps, map);
                dsos__add(&dsos__kernel, dso);
        }
        free(line);
        fclose(file);
-        return dsos__set_modules_path();
+        return perf_session__set_modules_path(self);
 out_delete_line:
        free(line);
@@ -1483,7 +1475,7 @@ out_failure:
 }
 static int dso__load_vmlinux(struct dso *self, struct map *map,
-                             struct map_groups *mg,
+                             struct perf_session *session,
                             const char *vmlinux, symbol_filter_t filter)
 {
        int err = -1, fd;
@@ -1517,14 +1509,14 @@ static int dso__load_vmlinux(struct dso *self, struct map *map,
                return -1;
        dso__set_loaded(self, map->type);
-        err = dso__load_sym(self, map, mg, self->long_name, fd, filter, 1, 0);
+        err = dso__load_sym(self, map, session, self->long_name, fd, filter, 1, 0);
        close(fd);
        return err;
 }
 static int dso__load_kernel_sym(struct dso *self, struct map *map,
-                                struct map_groups *mg, symbol_filter_t filter)
+                                struct perf_session *session, symbol_filter_t filter)
 {
        int err;
        bool is_kallsyms;
@@ -1534,7 +1526,7 @@ static int dso__load_kernel_sym(struct dso *self, struct map *map,
                pr_debug("Looking at the vmlinux_path (%d entries long)\n",
                         vmlinux_path__nr_entries);
                for (i = 0; i < vmlinux_path__nr_entries; ++i) {
-                        err = dso__load_vmlinux(self, map, mg,
+                        err = dso__load_vmlinux(self, map, session,
                                                vmlinux_path[i], filter);
                        if (err > 0) {
                                pr_debug("Using %s for symbols\n",
@@ -1550,12 +1542,12 @@ static int dso__load_kernel_sym(struct dso *self, struct map *map,
        if (is_kallsyms)
                goto do_kallsyms;
-        err = dso__load_vmlinux(self, map, mg, self->long_name, filter);
+        err = dso__load_vmlinux(self, map, session, self->long_name, filter);
        if (err <= 0) {
                pr_info("The file %s cannot be used, "
                        "trying to use /proc/kallsyms...", self->long_name);
 do_kallsyms:
-                err = dso__load_kallsyms(self, map, mg, filter);
+                err = dso__load_kallsyms(self, map, session, filter);
                if (err > 0 && !is_kallsyms)
                        dso__set_long_name(self, strdup("[kernel.kallsyms]"));
        }
@@ -1757,23 +1749,30 @@ int symbol__init(struct symbol_conf *conf)
        if (pconf->sort_by_name)
                symbol__priv_size += (sizeof(struct symbol_name_rb_node) -
                                      sizeof(struct symbol));
-        map_groups__init(kmaps);
        if (pconf->try_vmlinux_path && vmlinux_path__init() < 0)
                return -1;
-        if (map_groups__create_kernel_maps(kmaps, pconf->vmlinux_name) < 0) {
+        return 0;
-                vmlinux_path__exit();
+}
+int perf_session__create_kernel_maps(struct perf_session *self,
+                                     struct symbol_conf *conf)
+{
+        const struct symbol_conf *pconf = conf ?: &symbol_conf__defaults;
+        if (map_groups__create_kernel_maps(&self->kmaps,
+                                           pconf->vmlinux_name) < 0)
                return -1;
-        }
-        kmaps->use_modules = pconf->use_modules;
+        self->use_modules = pconf->use_modules;
-        if (pconf->use_modules && map_groups__create_module_maps(kmaps) < 0)
-                pr_debug("Failed to load list of modules in use, "
+        if (pconf->use_modules && perf_session__create_module_maps(self) < 0)
-                         "continuing...\n");
+                pr_debug("Failed to load list of modules for session %s, "
+                         "continuing...\n", self->filename);
        /*
         * Now that we have all the maps created, just set the ->end of them:
         */
-        map_groups__fixup_end(kmaps);
+        map_groups__fixup_end(&self->kmaps);
        return 0;
 }
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index cf99f88adf3..941ef331790 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -98,8 +98,11 @@ bool dso__sorted_by_name(const struct dso *self, enum map_type type);
 void dso__sort_by_name(struct dso *self, enum map_type type);
+struct perf_session;
 struct dso *dsos__findnew(const char *name);
-int dso__load(struct dso *self, struct map *map, symbol_filter_t filter);
+int dso__load(struct dso *self, struct map *map, struct perf_session *session,
+              symbol_filter_t filter);
 void dsos__fprintf(FILE *fp);
 size_t dsos__fprintf_buildid(FILE *fp);
@@ -116,12 +119,10 @@ int sysfs__read_build_id(const char *filename, void *bf, size_t size);
 bool dsos__read_build_ids(void);
 int build_id__sprintf(u8 *self, int len, char *bf);
-size_t kernel_maps__fprintf(FILE *fp);
 int symbol__init(struct symbol_conf *conf);
+int perf_session__create_kernel_maps(struct perf_session *self,
+                                     struct symbol_conf *conf);
-struct map_groups;
-struct map_groups *kmaps;
 extern struct list_head dsos__user, dsos__kernel;
 extern struct dso *vdso;
 #endif /* __PERF_SYMBOL */
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 634b7f7140d..4a08dcf50b6 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -282,13 +282,14 @@ size_t perf_session__fprintf(struct perf_session *self, FILE *fp)
 }
 struct symbol *map_groups__find_symbol(struct map_groups *self,
+                                       struct perf_session *session,
                                       enum map_type type, u64 addr,
                                       symbol_filter_t filter)
 {
        struct map *map = map_groups__find(self, type, addr);
        if (map != NULL)
-                return map__find_symbol(map, map->map_ip(map, addr), filter);
+                return map__find_symbol(map, session, map->map_ip(map, addr), filter);
        return NULL;
 }
diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index e93abf2d9cb..c206f72c888 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -8,7 +8,6 @@
 struct map_groups {
        struct rb_root          maps[MAP__NR_TYPES];
        struct list_head        removed_maps[MAP__NR_TYPES];
-        bool                    use_modules;
 };
 struct thread {
@@ -49,19 +48,21 @@ static inline struct map *thread__find_map(struct thread *self,
        return self ? map_groups__find(&self->mg, type, addr) : NULL;
 }
-void thread__find_addr_location(struct thread *self, u8 cpumode,
+void thread__find_addr_location(struct thread *self,
+                                struct perf_session *session, u8 cpumode,
                                enum map_type type, u64 addr,
                                struct addr_location *al,
                                symbol_filter_t filter);
 struct symbol *map_groups__find_symbol(struct map_groups *self,
+                                       struct perf_session *session,
                                       enum map_type type, u64 addr,
                                       symbol_filter_t filter);
 static inline struct symbol *
-map_groups__find_function(struct map_groups *self, u64 addr,
+map_groups__find_function(struct map_groups *self, struct perf_session *session,
-                          symbol_filter_t filter)
+                          u64 addr, symbol_filter_t filter)
 {
-        return map_groups__find_symbol(self, MAP__FUNCTION, addr, filter);
+        return map_groups__find_symbol(self, session, MAP__FUNCTION, addr, filter);
 }
 struct map *map_groups__find_by_name(struct map_groups *self,