[PATCH v3 12/22] perf maps: Remove rb_node from struct map

Ian Rogers
2022-02-11T10:35:18Z

struct map is reference counted, having it also be a node in an
red-black tree complicates the reference counting. Switch to having a
map_rb_node which is a red-block tree node but points at the reference
counted struct map. This reference is responsible for a single reference
count.

Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/arch/x86/util/event.c | 13 +-
tools/perf/builtin-report.c | 6 +-
tools/perf/tests/maps.c | 8 +-
tools/perf/tests/vmlinux-kallsyms.c | 17 +--
tools/perf/util/machine.c | 62 ++++++----
tools/perf/util/map.c | 16 ---
tools/perf/util/map.h | 1 -
tools/perf/util/maps.c | 182 ++++++++++++++++++----------
tools/perf/util/maps.h | 17 ++-
tools/perf/util/probe-event.c | 18 +--
tools/perf/util/symbol-elf.c | 9 +-
tools/perf/util/symbol.c | 77 +++++++-----
tools/perf/util/synthetic-events.c | 26 ++--
tools/perf/util/thread.c | 10 +-
tools/perf/util/vdso.c | 7 +-
15 files changed, 288 insertions(+), 181 deletions(-)

diff --git a/tools/perf/arch/x86/util/event.c b/tools/perf/arch/x86/util/event.c
index e670f3547581..7b6b0c98fb36 100644
--- a/tools/perf/arch/x86/util/event.c
+++ b/tools/perf/arch/x86/util/event.c
@@ -17,7 +17,7 @@ int perf_event__synthesize_extra_kmaps(struct perf_tool *tool,
struct machine *machine)
{
int rc = 0;
- struct map *pos;
+ struct map_rb_node *pos;
struct maps *kmaps = machine__kernel_maps(machine);
union perf_event *event = zalloc(sizeof(event->mmap) +
machine->id_hdr_size);
@@ -31,11 +31,12 @@ int perf_event__synthesize_extra_kmaps(struct perf_tool *tool,
maps__for_each_entry(kmaps, pos) {
struct kmap *kmap;
size_t size;
+ struct map *map = pos->map;

- if (!__map__is_extra_kernel_map(pos))
+ if (!__map__is_extra_kernel_map(map))
continue;

- kmap = map__kmap(pos);
+ kmap = map__kmap(map);

size = sizeof(event->mmap) - sizeof(event->mmap.filename) +
PERF_ALIGN(strlen(kmap->name) + 1, sizeof(u64)) +
@@ -56,9 +57,9 @@ int perf_event__synthesize_extra_kmaps(struct perf_tool *tool,

event->mmap.header.size = size;

- event->mmap.start = pos->start;
- event->mmap.len = pos->end - pos->start;
- event->mmap.pgoff = pos->pgoff;
+ event->mmap.start = map->start;
+ event->mmap.len = map->end - map->start;
+ event->mmap.pgoff = map->pgoff;
event->mmap.pid = machine->pid;

strlcpy(event->mmap.filename, kmap->name, PATH_MAX);
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 1dd92d8c9279..57611ef725c3 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -799,9 +799,11 @@ static struct task *tasks_list(struct task *task, struct machine *machine)
static size_t maps__fprintf_task(struct maps *maps, int indent, FILE *fp)
{
size_t printed = 0;
- struct map *map;
+ struct map_rb_node *rb_node;
+
+ maps__for_each_entry(maps, rb_node) {
+ struct map *map = rb_node->map;

- maps__for_each_entry(maps, map) {
printed += fprintf(fp, "%*s %" PRIx64 "-%" PRIx64 " %c%c%c%c %08" PRIx64 " %" PRIu64 " %s\n",
indent, "", map->start, map->end,
map->prot & PROT_READ ? 'r' : '-',
diff --git a/tools/perf/tests/maps.c b/tools/perf/tests/maps.c
index 6f53f17f788e..a58274598587 100644
--- a/tools/perf/tests/maps.c
+++ b/tools/perf/tests/maps.c
@@ -15,10 +15,12 @@ struct map_def {

static int check_maps(struct map_def *merged, unsigned int size, struct maps *maps)
{
- struct map *map;
+ struct map_rb_node *rb_node;
unsigned int i = 0;

- maps__for_each_entry(maps, map) {
+ maps__for_each_entry(maps, rb_node) {
+ struct map *map = rb_node->map;
+
if (i > 0)
TEST_ASSERT_VAL("less maps expected", (map && i < size) || (!map && i == size));

@@ -74,7 +76,7 @@ static int test__maps__merge_in(struct test_suite *t __maybe_unused, int subtest

map->start = bpf_progs[i].start;
map->end = bpf_progs[i].end;
- maps__insert(maps, map);
+ TEST_ASSERT_VAL("failed to insert map", maps__insert(maps, map) == 0);
map__put(map);
}

diff --git a/tools/perf/tests/vmlinux-kallsyms.c b/tools/perf/tests/vmlinux-kallsyms.c
index 84bf5f640065..11a230ee5894 100644
--- a/tools/perf/tests/vmlinux-kallsyms.c
+++ b/tools/perf/tests/vmlinux-kallsyms.c
@@ -117,7 +117,8 @@ static int test__vmlinux_matches_kallsyms(struct test_suite *test __maybe_unused
int err = -1;
struct rb_node *nd;
struct symbol *sym;
- struct map *kallsyms_map, *vmlinux_map, *map;
+ struct map *kallsyms_map, *vmlinux_map;
+ struct map_rb_node *rb_node;
struct machine kallsyms, vmlinux;
struct maps *maps = machine__kernel_maps(&vmlinux);
u64 mem_start, mem_end;
@@ -285,15 +286,15 @@ static int test__vmlinux_matches_kallsyms(struct test_suite *test __maybe_unused

header_printed = false;

- maps__for_each_entry(maps, map) {
- struct map *
+ maps__for_each_entry(maps, rb_node) {
+ struct map *map = rb_node->map;
/*
* 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 = maps__find_by_name(kallsyms.kmaps, (map->dso->kernel ?
+ struct map *pair = maps__find_by_name(kallsyms.kmaps, (map->dso->kernel ?
map->dso->short_name :
map->dso->name));
if (pair) {
@@ -309,8 +310,8 @@ static int test__vmlinux_matches_kallsyms(struct test_suite *test __maybe_unused

header_printed = false;

- maps__for_each_entry(maps, map) {
- struct map *pair;
+ maps__for_each_entry(maps, rb_node) {
+ struct map *pair, *map = rb_node->map;

mem_start = vmlinux_map->unmap_ip(vmlinux_map, map->start);
mem_end = vmlinux_map->unmap_ip(vmlinux_map, map->end);
@@ -339,7 +340,9 @@ static int test__vmlinux_matches_kallsyms(struct test_suite *test __maybe_unused

maps = machine__kernel_maps(&kallsyms);

- maps__for_each_entry(maps, map) {
+ maps__for_each_entry(maps, rb_node) {
+ struct map *map = rb_node->map;
+
if (!map->priv) {
if (!header_printed) {
pr_info("WARN: Maps only in kallsyms:\n");
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 57fbdba66425..fa25174cabf7 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -786,6 +786,7 @@ static int machine__process_ksymbol_register(struct machine *machine,

if (!map) {
struct dso *dso = dso__new(event->ksymbol.name);
+ int err;

if (dso) {
dso->kernel = DSO_SPACE__KERNEL;
@@ -805,8 +806,11 @@ static int machine__process_ksymbol_register(struct machine *machine,

map->start = event->ksymbol.addr;
map->end = map->start + event->ksymbol.len;
- maps__insert(machine__kernel_maps(machine), map);
+ err = maps__insert(machine__kernel_maps(machine), map);
map__put(map);
+ if (err)
+ return err;
+
dso__set_loaded(dso);

if (is_bpf_image(event->ksymbol.name)) {
@@ -906,6 +910,7 @@ static struct map *machine__addnew_module_map(struct machine *machine, u64 start
struct map *map = NULL;
struct kmod_path m;
struct dso *dso;
+ int err;

if (kmod_path__parse_name(&m, filename))
return NULL;
@@ -918,10 +923,14 @@ static struct map *machine__addnew_module_map(struct machine *machine, u64 start
if (map == NULL)
goto out;

- maps__insert(machine__kernel_maps(machine), map);
+ err = maps__insert(machine__kernel_maps(machine), map);

/* Put the map here because maps__insert already got it */
map__put(map);
+
+ /* If maps__insert failed, return NULL. */
+ if (err)
+ map = NULL;
out:
/* put the dso here, corresponding to machine__findnew_module_dso */
dso__put(dso);
@@ -1092,10 +1101,11 @@ int machine__create_extra_kernel_map(struct machine *machine,
{
struct kmap *kmap;
struct map *map;
+ int err;

map = map__new2(xm->start, kernel);
if (!map)
- return -1;
+ return -ENOMEM;

map->end = xm->end;
map->pgoff = xm->pgoff;
@@ -1104,14 +1114,16 @@ int machine__create_extra_kernel_map(struct machine *machine,

strlcpy(kmap->name, xm->name, KMAP_NAME_LEN);

- maps__insert(machine__kernel_maps(machine), map);
+ err = maps__insert(machine__kernel_maps(machine), map);

- pr_debug2("Added extra kernel map %s %" PRIx64 "-%" PRIx64 "\n",
- kmap->name, map->start, map->end);
+ if (!err) {
+ pr_debug2("Added extra kernel map %s %" PRIx64 "-%" PRIx64 "\n",
+ kmap->name, map->start, map->end);
+ }

map__put(map);

- return 0;
+ return err;
}

static u64 find_entry_trampoline(struct dso *dso)
@@ -1152,16 +1164,16 @@ int machine__map_x86_64_entry_trampolines(struct machine *machine,
struct maps *kmaps = machine__kernel_maps(machine);
int nr_cpus_avail, cpu;
bool found = false;
- struct map *map;
+ struct map_rb_node *rb_node;
u64 pgoff;

/*
* In the vmlinux case, pgoff is a virtual address which must now be
* mapped to a vmlinux offset.
*/
- maps__for_each_entry(kmaps, map) {
+ maps__for_each_entry(kmaps, rb_node) {
+ struct map *dest_map, *map = rb_node->map;
struct kmap *kmap = __map__kmap(map);
- struct map *dest_map;

if (!kmap || !is_entry_trampoline(kmap->name))
continue;
@@ -1216,11 +1228,10 @@ __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)

machine->vmlinux_map = map__new2(0, kernel);
if (machine->vmlinux_map == NULL)
- return -1;
+ return -ENOMEM;

machine->vmlinux_map->map_ip = machine->vmlinux_map->unmap_ip = identity__map_ip;
- maps__insert(machine__kernel_maps(machine), machine->vmlinux_map);
- return 0;
+ return maps__insert(machine__kernel_maps(machine), machine->vmlinux_map);
}

void machine__destroy_kernel_maps(struct machine *machine)
@@ -1542,25 +1553,26 @@ static void machine__set_kernel_mmap(struct machine *machine,
machine->vmlinux_map->end = ~0ULL;
}

-static void machine__update_kernel_mmap(struct machine *machine,
+static int machine__update_kernel_mmap(struct machine *machine,
u64 start, u64 end)
{
struct map *map = machine__kernel_map(machine);
+ int err;

map__get(map);
maps__remove(machine__kernel_maps(machine), map);

machine__set_kernel_mmap(machine, start, end);

- maps__insert(machine__kernel_maps(machine), map);
+ err = maps__insert(machine__kernel_maps(machine), map);
map__put(map);
+ return err;
}

int machine__create_kernel_maps(struct machine *machine)
{
struct dso *kernel = machine__get_kernel(machine);
const char *name = NULL;
- struct map *map;
u64 start = 0, end = ~0ULL;
int ret;

@@ -1592,7 +1604,9 @@ int machine__create_kernel_maps(struct machine *machine)
* we have a real start address now, so re-order the kmaps
* assume it's the last in the kmaps
*/
- machine__update_kernel_mmap(machine, start, end);
+ ret = machine__update_kernel_mmap(machine, start, end);
+ if (ret < 0)
+ goto out_put;
}

if (machine__create_extra_kernel_maps(machine, kernel))
@@ -1600,9 +1614,12 @@ int machine__create_kernel_maps(struct machine *machine)

if (end == ~0ULL) {
/* update end address of the kernel map using adjacent module address */
- map = map__next(machine__kernel_map(machine));
- if (map)
- machine__set_kernel_mmap(machine, start, map->start);
+ struct map_rb_node *rb_node = maps__find_node(machine__kernel_maps(machine),
+ machine__kernel_map(machine));
+ struct map_rb_node *next = map_rb_node__next(rb_node);
+
+ if (next)
+ machine__set_kernel_mmap(machine, start, next->map->start);
}

out_put:
@@ -1726,7 +1743,10 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
if (strstr(kernel->long_name, "vmlinux"))
dso__set_short_name(kernel, "[kernel.vmlinux]", false);

- machine__update_kernel_mmap(machine, xm->start, xm->end);
+ if (machine__update_kernel_mmap(machine, xm->start, xm->end) < 0) {
+ dso__put(kernel);
+ goto out_problem;
+ }

if (build_id__is_defined(bid))
dso__set_build_id(kernel, bid);
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 8bbf9246a3cf..dfa5f6b7381f 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -111,7 +111,6 @@ void map__init(struct map *map, u64 start, u64 end, u64 pgoff, struct dso *dso)
map->dso = dso__get(dso);
map->map_ip = map__map_ip;
map->unmap_ip = map__unmap_ip;
- RB_CLEAR_NODE(&map->rb_node);
map->erange_warned = false;
refcount_set(&map->refcnt, 1);
}
@@ -383,7 +382,6 @@ struct map *map__clone(struct map *from)
map = memdup(from, size);
if (map != NULL) {
refcount_set(&map->refcnt, 1);
- RB_CLEAR_NODE(&map->rb_node);
dso__get(map->dso);
}

@@ -523,20 +521,6 @@ bool map__contains_symbol(const struct map *map, const struct symbol *sym)
return ip >= map->start && ip < map->end;
}

-static struct map *__map__next(struct map *map)
-{
- struct rb_node *next = rb_next(&map->rb_node);
-
- if (next)
- return rb_entry(next, struct map, rb_node);
- return NULL;
-}
-
-struct map *map__next(struct map *map)
-{
- return map ? __map__next(map) : NULL;
-}
-
struct kmap *__map__kmap(struct map *map)
{
if (!map->dso || !map->dso->kernel)
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index 2879cae05ee0..d1a6f85fd31d 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -16,7 +16,6 @@ struct maps;
struct machine;

struct map {
- struct rb_node rb_node;
u64 start;
u64 end;
bool erange_warned:1;
diff --git a/tools/perf/util/maps.c b/tools/perf/util/maps.c
index ededabf0a230..beb09b9a122c 100644
--- a/tools/perf/util/maps.c
+++ b/tools/perf/util/maps.c
@@ -10,9 +10,7 @@
#include "ui/ui.h"
#include "unwind.h"

-static void __maps__insert(struct maps *maps, struct map *map);
-
-void maps__init(struct maps *maps, struct machine *machine)
+static void maps__init(struct maps *maps, struct machine *machine)
{
maps->entries = RB_ROOT;
init_rwsem(&maps->lock);
@@ -32,10 +30,44 @@ static void __maps__free_maps_by_name(struct maps *maps)
maps->nr_maps_allocated = 0;
}

-void maps__insert(struct maps *maps, struct map *map)
+static int __maps__insert(struct maps *maps, struct map *map)
+{
+ struct rb_node **p = &maps->entries.rb_node;
+ struct rb_node *parent = NULL;
+ const u64 ip = map->start;
+ struct map_rb_node *m, *new_rb_node;
+
+ new_rb_node = malloc(sizeof(*new_rb_node));
+ if (!new_rb_node)
+ return -ENOMEM;
+
+ RB_CLEAR_NODE(&new_rb_node->rb_node);
+ new_rb_node->map = map;
+
+ while (*p != NULL) {
+ parent = *p;
+ m = rb_entry(parent, struct map_rb_node, rb_node);
+ if (ip < m->map->start)
+ p = &(*p)->rb_left;
+ else
+ p = &(*p)->rb_right;
+ }
+
+ rb_link_node(&new_rb_node->rb_node, parent, p);
+ rb_insert_color(&new_rb_node->rb_node, &maps->entries);
+ map__get(map);
+ return 0;
+}
+
+int maps__insert(struct maps *maps, struct map *map)
{
+ int err;
+
down_write(&maps->lock);
- __maps__insert(maps, map);
+ err = __maps__insert(maps, map);
+ if (err)
+ goto out;
+
++maps->nr_maps;

if (map->dso && map->dso->kernel) {
@@ -59,8 +91,8 @@ void maps__insert(struct maps *maps, struct map *map)

if (maps_by_name == NULL) {
__maps__free_maps_by_name(maps);
- up_write(&maps->lock);
- return;
+ err = -ENOMEM;
+ goto out;
}

maps->maps_by_name = maps_by_name;
@@ -69,22 +101,29 @@ void maps__insert(struct maps *maps, struct map *map)
maps->maps_by_name[maps->nr_maps - 1] = map;
__maps__sort_by_name(maps);
}
+out:
up_write(&maps->lock);
+ return err;
}

-static void __maps__remove(struct maps *maps, struct map *map)
+static void __maps__remove(struct maps *maps, struct map_rb_node *rb_node)
{
- rb_erase_init(&map->rb_node, &maps->entries);
- map__put(map);
+ rb_erase_init(&rb_node->rb_node, &maps->entries);
+ map__put(rb_node->map);
+ free(rb_node);
}

void maps__remove(struct maps *maps, struct map *map)
{
+ struct map_rb_node *rb_node;
+
down_write(&maps->lock);
if (maps->last_search_by_name == map)
maps->last_search_by_name = NULL;

- __maps__remove(maps, map);
+ rb_node = maps__find_node(maps, map);
+ assert(rb_node->map == map);
+ __maps__remove(maps, rb_node);
--maps->nr_maps;
if (maps->maps_by_name)
__maps__free_maps_by_name(maps);
@@ -93,15 +132,16 @@ void maps__remove(struct maps *maps, struct map *map)

static void __maps__purge(struct maps *maps)
{
- struct map *pos, *next;
+ struct map_rb_node *pos, *next;

maps__for_each_entry_safe(maps, pos, next) {
rb_erase_init(&pos->rb_node, &maps->entries);
- map__put(pos);
+ map__put(pos->map);
+ free(pos);
}
}

-void maps__exit(struct maps *maps)
+static void maps__exit(struct maps *maps)
{
down_write(&maps->lock);
__maps__purge(maps);
@@ -153,21 +193,21 @@ struct symbol *maps__find_symbol(struct maps *maps, u64 addr, struct map **mapp)
struct symbol *maps__find_symbol_by_name(struct maps *maps, const char *name, struct map **mapp)
{
struct symbol *sym;
- struct map *pos;
+ struct map_rb_node *pos;

down_read(&maps->lock);

maps__for_each_entry(maps, pos) {
- sym = map__find_symbol_by_name(pos, name);
+ sym = map__find_symbol_by_name(pos->map, name);

if (sym == NULL)
continue;
- if (!map__contains_symbol(pos, sym)) {
+ if (!map__contains_symbol(pos->map, sym)) {
sym = NULL;
continue;
}
if (mapp != NULL)
- *mapp = pos;
+ *mapp = pos->map;
goto out;
}

@@ -196,15 +236,15 @@ int maps__find_ams(struct maps *maps, struct addr_map_symbol *ams)
size_t maps__fprintf(struct maps *maps, FILE *fp)
{
size_t printed = 0;
- struct map *pos;
+ struct map_rb_node *pos;

down_read(&maps->lock);

maps__for_each_entry(maps, pos) {
printed += fprintf(fp, "Map:");
- printed += map__fprintf(pos, fp);
+ printed += map__fprintf(pos->map, fp);
if (verbose > 2) {
- printed += dso__fprintf(pos->dso, fp);
+ printed += dso__fprintf(pos->map->dso, fp);
printed += fprintf(fp, "--\n");
}
}
@@ -231,11 +271,11 @@ int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)
next = root->rb_node;
first = NULL;
while (next) {
- struct map *pos = rb_entry(next, struct map, rb_node);
+ struct map_rb_node *pos = rb_entry(next, struct map_rb_node, rb_node);

- if (pos->end > map->start) {
+ if (pos->map->end > map->start) {
first = next;
- if (pos->start <= map->start)
+ if (pos->map->start <= map->start)
break;
next = next->rb_left;
} else
@@ -244,14 +284,14 @@ int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)

next = first;
while (next) {
- struct map *pos = rb_entry(next, struct map, rb_node);
+ struct map_rb_node *pos = rb_entry(next, struct map_rb_node, rb_node);
next = rb_next(&pos->rb_node);

/*
* Stop if current map starts after map->end.
* Maps are ordered by start: next will not overlap for sure.
*/
- if (pos->start >= map->end)
+ if (pos->map->start >= map->end)
break;

if (verbose >= 2) {
@@ -262,7 +302,7 @@ int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)
} else {
fputs("overlapping maps:\n", fp);
map__fprintf(map, fp);
- map__fprintf(pos, fp);
+ map__fprintf(pos->map, fp);
}
}

@@ -271,8 +311,8 @@ int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)
* Now check if we need to create new maps for areas not
* overlapped by the new map:
*/
- if (map->start > pos->start) {
- struct map *before = map__clone(pos);
+ if (map->start > pos->map->start) {
+ struct map *before = map__clone(pos->map);

if (before == NULL) {
err = -ENOMEM;
@@ -280,14 +320,17 @@ int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)
}

before->end = map->start;
- __maps__insert(maps, before);
+ err = __maps__insert(maps, before);
+ if (err)
+ goto put_map;
+
if (verbose >= 2 && !use_browser)
map__fprintf(before, fp);
map__put(before);
}

- if (map->end < pos->end) {
- struct map *after = map__clone(pos);
+ if (map->end < pos->map->end) {
+ struct map *after = map__clone(pos->map);

if (after == NULL) {
err = -ENOMEM;
@@ -295,15 +338,19 @@ int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)
}

after->start = map->end;
- after->pgoff += map->end - pos->start;
- assert(pos->map_ip(pos, map->end) == after->map_ip(after, map->end));
- __maps__insert(maps, after);
+ after->pgoff += map->end - pos->map->start;
+ assert(pos->map->map_ip(pos->map, map->end) ==
+ after->map_ip(after, map->end));
+ err = __maps__insert(maps, after);
+ if (err)
+ goto put_map;
+
if (verbose >= 2 && !use_browser)
map__fprintf(after, fp);
map__put(after);
}
put_map:
- map__put(pos);
+ map__put(pos->map);

if (err)
goto out;
@@ -322,12 +369,12 @@ int maps__clone(struct thread *thread, struct maps *parent)
{
struct maps *maps = thread->maps;
int err;
- struct map *map;
+ struct map_rb_node *rb_node;

down_read(&parent->lock);

- maps__for_each_entry(parent, map) {
- struct map *new = map__clone(map);
+ maps__for_each_entry(parent, rb_node) {
+ struct map *new = map__clone(rb_node->map);

if (new == NULL) {
err = -ENOMEM;
@@ -338,7 +385,10 @@ int maps__clone(struct thread *thread, struct maps *parent)
if (err)
goto out_unlock;

- maps__insert(maps, new);
+ err = maps__insert(maps, new);
+ if (err)
+ goto out_unlock;
+
map__put(new);
}

@@ -348,40 +398,30 @@ int maps__clone(struct thread *thread, struct maps *parent)
return err;
}

-static void __maps__insert(struct maps *maps, struct map *map)
+struct map_rb_node *maps__find_node(struct maps *maps, struct map *map)
{
- struct rb_node **p = &maps->entries.rb_node;
- struct rb_node *parent = NULL;
- const u64 ip = map->start;
- struct map *m;
+ struct map_rb_node *rb_node;

- while (*p != NULL) {
- parent = *p;
- m = rb_entry(parent, struct map, rb_node);
- if (ip < m->start)
- p = &(*p)->rb_left;
- else
- p = &(*p)->rb_right;
+ maps__for_each_entry(maps, rb_node) {
+ if (rb_node->map == map)
+ return rb_node;
}
-
- rb_link_node(&map->rb_node, parent, p);
- rb_insert_color(&map->rb_node, &maps->entries);
- map__get(map);
+ return NULL;
}

struct map *maps__find(struct maps *maps, u64 ip)
{
struct rb_node *p;
- struct map *m;
+ struct map_rb_node *m;

down_read(&maps->lock);

p = maps->entries.rb_node;
while (p != NULL) {
- m = rb_entry(p, struct map, rb_node);
- if (ip < m->start)
+ m = rb_entry(p, struct map_rb_node, rb_node);
+ if (ip < m->map->start)
p = p->rb_left;
- else if (ip >= m->end)
+ else if (ip >= m->map->end)
p = p->rb_right;
else
goto out;
@@ -390,14 +430,30 @@ struct map *maps__find(struct maps *maps, u64 ip)
m = NULL;
out:
up_read(&maps->lock);
- return m;
+
+ return m ? m->map : NULL;
}

-struct map *maps__first(struct maps *maps)
+struct map_rb_node *maps__first(struct maps *maps)
{
struct rb_node *first = rb_first(&maps->entries);

if (first)
- return rb_entry(first, struct map, rb_node);
+ return rb_entry(first, struct map_rb_node, rb_node);
return NULL;
}
+
+struct map_rb_node *map_rb_node__next(struct map_rb_node *node)
+{
+ struct rb_node *next;
+
+ if (!node)
+ return NULL;
+
+ next = rb_next(&node->rb_node);
+
+ if (!next)
+ return NULL;
+
+ return rb_entry(next, struct map_rb_node, rb_node);
+}
diff --git a/tools/perf/util/maps.h b/tools/perf/util/maps.h
index 7e729ff42749..512746ec0f9a 100644
--- a/tools/perf/util/maps.h
+++ b/tools/perf/util/maps.h
@@ -15,15 +15,22 @@ struct map;
struct maps;
struct thread;

+struct map_rb_node {
+ struct rb_node rb_node;
+ struct map *map;
+};
+
+struct map_rb_node *maps__first(struct maps *maps);
+struct map_rb_node *map_rb_node__next(struct map_rb_node *node);
+struct map_rb_node *maps__find_node(struct maps *maps, struct map *map);
struct map *maps__find(struct maps *maps, u64 addr);
-struct map *maps__first(struct maps *maps);
-struct map *map__next(struct map *map);

#define maps__for_each_entry(maps, map) \
- for (map = maps__first(maps); map; map = map__next(map))
+ for (map = maps__first(maps); map; map = map_rb_node__next(map))

#define maps__for_each_entry_safe(maps, map, next) \
- for (map = maps__first(maps), next = map__next(map); map; map = next, next = map__next(map))
+ for (map = maps__first(maps), next = map_rb_node__next(map); map; \
+ map = next, next = map_rb_node__next(map))

struct maps {
struct rb_root entries;
@@ -63,7 +70,7 @@ void maps__put(struct maps *maps);
int maps__clone(struct thread *thread, struct maps *parent);
size_t maps__fprintf(struct maps *maps, FILE *fp);

-void maps__insert(struct maps *maps, struct map *map);
+int maps__insert(struct maps *maps, struct map *map);

void maps__remove(struct maps *maps, struct map *map);

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index bc5ab782ace5..f9fbf611f2bf 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -150,23 +150,27 @@ static int kernel_get_symbol_address_by_name(const char *name, u64 *addr,
static struct map *kernel_get_module_map(const char *module)
{
struct maps *maps = machine__kernel_maps(host_machine);
- struct map *pos;
+ struct map_rb_node *pos;

/* A file path -- this is an offline module */
if (module && strchr(module, '/'))
return dso__new_map(module);

if (!module) {
- pos = machine__kernel_map(host_machine);
- return map__get(pos);
+ struct map *map = machine__kernel_map(host_machine);
+
+ return map__get(map);
}

maps__for_each_entry(maps, pos) {
/* short_name is "[module]" */
- if (strncmp(pos->dso->short_name + 1, module,
- pos->dso->short_name_len - 2) == 0 &&
- module[pos->dso->short_name_len - 2] == '\0') {
- return map__get(pos);
+ const char *short_name = pos->map->dso->short_name;
+ u16 short_name_len = pos->map->dso->short_name_len;
+
+ if (strncmp(short_name + 1, module,
+ short_name_len - 2) == 0 &&
+ module[short_name_len - 2] == '\0') {
+ return map__get(pos->map);
}
}
return NULL;
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 31cd59a2b66e..4607c9438866 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -1000,10 +1000,14 @@ static int dso__process_kernel_symbol(struct dso *dso, struct map *map,
map->unmap_ip = map__unmap_ip;
/* Ensure maps are correctly ordered */
if (kmaps) {
+ int err;
+
map__get(map);
maps__remove(kmaps, map);
- maps__insert(kmaps, map);
+ err = maps__insert(kmaps, map);
map__put(map);
+ if (err)
+ return err;
}
}

@@ -1056,7 +1060,8 @@ static int dso__process_kernel_symbol(struct dso *dso, struct map *map,
curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
}
curr_dso->symtab_type = dso->symtab_type;
- maps__insert(kmaps, curr_map);
+ if (maps__insert(kmaps, curr_map))
+ return -1;
/*
* Add it before we drop the reference to curr_map, i.e. while
* we still are sure to have a reference to this DSO via
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 99accae7d3b8..266c65bb8bbb 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -247,13 +247,13 @@ void symbols__fixup_end(struct rb_root_cached *symbols)

void maps__fixup_end(struct maps *maps)
{
- struct map *prev = NULL, *curr;
+ struct map_rb_node *prev = NULL, *curr;

down_write(&maps->lock);

maps__for_each_entry(maps, curr) {
- if (prev != NULL && !prev->end)
- prev->end = curr->start;
+ if (prev != NULL && !prev->map->end)
+ prev->map->end = curr->map->start;

prev = curr;
}
@@ -262,8 +262,8 @@ void maps__fixup_end(struct maps *maps)
* We still haven't the actual symbols, so guess the
* last map final address.
*/
- if (curr && !curr->end)
- curr->end = ~0ULL;
+ if (curr && !curr->map->end)
+ curr->map->end = ~0ULL;

up_write(&maps->lock);
}
@@ -911,7 +911,10 @@ static int maps__split_kallsyms(struct maps *kmaps, struct dso *dso, u64 delta,
}

curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
- maps__insert(kmaps, curr_map);
+ if (maps__insert(kmaps, curr_map)) {
+ dso__put(ndso);
+ return -1;
+ }
++kernel_range;
} else if (delta) {
/* Kernel was relocated at boot time */
@@ -1099,14 +1102,15 @@ int compare_proc_modules(const char *from, const char *to)
static int do_validate_kcore_modules(const char *filename, struct maps *kmaps)
{
struct rb_root modules = RB_ROOT;
- struct map *old_map;
+ struct map_rb_node *old_node;
int err;

err = read_proc_modules(filename, &modules);
if (err)
return err;

- maps__for_each_entry(kmaps, old_map) {
+ maps__for_each_entry(kmaps, old_node) {
+ struct map *old_map = old_node->map;
struct module_info *mi;

if (!__map__is_kmodule(old_map)) {
@@ -1224,10 +1228,13 @@ static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
*/
int maps__merge_in(struct maps *kmaps, struct map *new_map)
{
- struct map *old_map;
+ struct map_rb_node *rb_node;
LIST_HEAD(merged);
+ int err = 0;
+
+ maps__for_each_entry(kmaps, rb_node) {
+ struct map *old_map = rb_node->map;

- maps__for_each_entry(kmaps, old_map) {
/* no overload with this one */
if (new_map->end < old_map->start ||
new_map->start >= old_map->end)
@@ -1252,13 +1259,16 @@ int maps__merge_in(struct maps *kmaps, struct map *new_map)
struct map_list_node *m;

m = malloc(sizeof(*m));
- if (!m)
- return -ENOMEM;
+ if (!m) {
+ err = -ENOMEM;
+ goto out;
+ }

m->map = map__clone(new_map);
if (!m->map) {
free(m);
- return -ENOMEM;
+ err = -ENOMEM;
+ goto out;
}

m->map->end = old_map->start;
@@ -1290,21 +1300,24 @@ int maps__merge_in(struct maps *kmaps, struct map *new_map)
}
}

+out:
while (!list_empty(&merged)) {
struct map_list_node *old_node;

old_node = list_entry(merged.next, struct map_list_node, node);
list_del_init(&old_node->node);
- maps__insert(kmaps, old_node->map);
+ if (!err)
+ err = maps__insert(kmaps, old_node->map);
map__put(old_node->map);
free(old_node);
}

if (new_map) {
- maps__insert(kmaps, new_map);
+ if (!err)
+ err = maps__insert(kmaps, new_map);
map__put(new_map);
}
- return 0;
+ return err;
}

static int dso__load_kcore(struct dso *dso, struct map *map,
@@ -1312,7 +1325,8 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
{
struct maps *kmaps = map__kmaps(map);
struct kcore_mapfn_data md;
- struct map *old_map, *replacement_map = NULL, *next;
+ struct map *replacement_map = NULL;
+ struct map_rb_node *old_node, *next;
struct machine *machine;
bool is_64_bit;
int err, fd;
@@ -1359,7 +1373,9 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
}

/* Remove old maps */
- maps__for_each_entry_safe(kmaps, old_map, next) {
+ maps__for_each_entry_safe(kmaps, old_node, next) {
+ struct map *old_map = old_node->map;
+
/*
* We need to preserve eBPF maps even if they are
* covered by kcore, because we need to access
@@ -1400,17 +1416,21 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
/* Ensure maps are correctly ordered */
map__get(map);
maps__remove(kmaps, map);
- maps__insert(kmaps, map);
+ err = maps__insert(kmaps, map);
map__put(map);
map__put(new_node->map);
+ if (err)
+ goto out_err;
} else {
/*
* Merge kcore map into existing maps,
* and ensure that current maps (eBPF)
* stay intact.
*/
- if (maps__merge_in(kmaps, new_node->map))
+ if (maps__merge_in(kmaps, new_node->map)) {
+ err = -EINVAL;
goto out_err;
+ }
}
free(new_node);
}
@@ -1457,7 +1477,7 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
free(list_node);
}
close(fd);
- return -EINVAL;
+ return err;
}

/*
@@ -1991,8 +2011,9 @@ void __maps__sort_by_name(struct maps *maps)

static int map__groups__sort_by_name_from_rbtree(struct maps *maps)
{
- struct map *map;
- struct map **maps_by_name = realloc(maps->maps_by_name, maps->nr_maps * sizeof(map));
+ struct map_rb_node *rb_node;
+ struct map **maps_by_name = realloc(maps->maps_by_name,
+ maps->nr_maps * sizeof(struct map *));
int i = 0;

if (maps_by_name == NULL)
@@ -2001,8 +2022,8 @@ static int map__groups__sort_by_name_from_rbtree(struct maps *maps)
maps->maps_by_name = maps_by_name;
maps->nr_maps_allocated = maps->nr_maps;

- maps__for_each_entry(maps, map)
- maps_by_name[i++] = map;
+ maps__for_each_entry(maps, rb_node)
+ maps_by_name[i++] = rb_node->map;

__maps__sort_by_name(maps);
return 0;
@@ -2024,6 +2045,7 @@ static struct map *__maps__find_by_name(struct maps *maps, const char *name)

struct map *maps__find_by_name(struct maps *maps, const char *name)
{
+ struct map_rb_node *rb_node;
struct map *map;

down_read(&maps->lock);
@@ -2042,12 +2064,13 @@ struct map *maps__find_by_name(struct maps *maps, const char *name)
goto out_unlock;

/* Fallback to traversing the rbtree... */
- maps__for_each_entry(maps, map)
+ maps__for_each_entry(maps, rb_node) {
+ map = rb_node->map;
if (strcmp(map->dso->short_name, name) == 0) {
maps->last_search_by_name = map;
goto out_unlock;
}
-
+ }
map = NULL;

out_unlock:
diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
index 70f095624a0b..ed2d55d224aa 100644
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -639,7 +639,7 @@ int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t
struct machine *machine)
{
int rc = 0;
- struct map *pos;
+ struct map_rb_node *pos;
struct maps *maps = machine__kernel_maps(machine);
union perf_event *event;
size_t size = symbol_conf.buildid_mmap2 ?
@@ -662,37 +662,39 @@ int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t
event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;

maps__for_each_entry(maps, pos) {
- if (!__map__is_kmodule(pos))
+ struct map *map = pos->map;
+
+ if (!__map__is_kmodule(map))
continue;

if (symbol_conf.buildid_mmap2) {
- size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
+ size = PERF_ALIGN(map->dso->long_name_len + 1, sizeof(u64));
event->mmap2.header.type = PERF_RECORD_MMAP2;
event->mmap2.header.size = (sizeof(event->mmap2) -
(sizeof(event->mmap2.filename) - size));
memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
event->mmap2.header.size += machine->id_hdr_size;
- event->mmap2.start = pos->start;
- event->mmap2.len = pos->end - pos->start;
+ event->mmap2.start = map->start;
+ event->mmap2.len = map->end - map->start;
event->mmap2.pid = machine->pid;

- memcpy(event->mmap2.filename, pos->dso->long_name,
- pos->dso->long_name_len + 1);
+ memcpy(event->mmap2.filename, map->dso->long_name,
+ map->dso->long_name_len + 1);

perf_record_mmap2__read_build_id(&event->mmap2, false);
} else {
- size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
+ size = PERF_ALIGN(map->dso->long_name_len + 1, sizeof(u64));
event->mmap.header.type = PERF_RECORD_MMAP;
event->mmap.header.size = (sizeof(event->mmap) -
(sizeof(event->mmap.filename) - size));
memset(event->mmap.filename + size, 0, machine->id_hdr_size);
event->mmap.header.size += machine->id_hdr_size;
- event->mmap.start = pos->start;
- event->mmap.len = pos->end - pos->start;
+ event->mmap.start = map->start;
+ event->mmap.len = map->end - map->start;
event->mmap.pid = machine->pid;

- memcpy(event->mmap.filename, pos->dso->long_name,
- pos->dso->long_name_len + 1);
+ memcpy(event->mmap.filename, map->dso->long_name,
+ map->dso->long_name_len + 1);
}

if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 665e5c0618ed..4baf4db8af65 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -338,9 +338,7 @@ int thread__insert_map(struct thread *thread, struct map *map)
return ret;

maps__fixup_overlappings(thread->maps, map, stderr);
- maps__insert(thread->maps, map);
-
- return 0;
+ return maps__insert(thread->maps, map);
}

static int __thread__prepare_access(struct thread *thread)
@@ -348,12 +346,12 @@ static int __thread__prepare_access(struct thread *thread)
bool initialized = false;
int err = 0;
struct maps *maps = thread->maps;
- struct map *map;
+ struct map_rb_node *rb_node;

down_read(&maps->lock);

- maps__for_each_entry(maps, map) {
- err = unwind__prepare_access(thread->maps, map, &initialized);
+ maps__for_each_entry(maps, rb_node) {
+ err = unwind__prepare_access(thread->maps, rb_node->map, &initialized);
if (err || initialized)
break;
}
diff --git a/tools/perf/util/vdso.c b/tools/perf/util/vdso.c
index 43beb169631d..835c39efb80d 100644
--- a/tools/perf/util/vdso.c
+++ b/tools/perf/util/vdso.c
@@ -144,10 +144,11 @@ static enum dso_type machine__thread_dso_type(struct machine *machine,
struct thread *thread)
{
enum dso_type dso_type = DSO__TYPE_UNKNOWN;
- struct map *map;
+ struct map_rb_node *rb_node;
+
+ maps__for_each_entry(thread->maps, rb_node) {
+ struct dso *dso = rb_node->map->dso;

- maps__for_each_entry(thread->maps, map) {
- struct dso *dso = map->dso;
if (!dso || dso->long_name[0] != '/')
continue;
dso_type = dso__type(dso, machine);
--
2.35.1.265.g69c8d7142f-goog