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Subject[PATCH 06/12] perf symbols: Better support for multiple symbol tables per dso
Date
From: Arnaldo Carvalho de Melo <acme@redhat.com>

By using an array of rb_roots in struct dso we can, from a struct map
instance to get the right symbol rb_tree more easily. This way we can
have just one symbol lookup method for struct map instances,
map__find_symbol, instead of one per symtab type (functions, variables).

Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-annotate.c | 2 +-
tools/perf/builtin-report.c | 2 +-
tools/perf/builtin-top.c | 2 +-
tools/perf/util/event.h | 12 +++++---
tools/perf/util/map.c | 12 +++++---
tools/perf/util/symbol.c | 59 +++++++++++++++++++++++++----------------
tools/perf/util/symbol.h | 7 ++---
7 files changed, 56 insertions(+), 40 deletions(-)
diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index 0846c8a..c32e760 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -170,7 +170,7 @@ process_sample_event(event_t *event, unsigned long offset, unsigned long head)
map = thread__find_map(thread, ip);
if (map != NULL) {
ip = map->map_ip(map, ip);
- sym = map__find_function(map, ip, symbol_filter);
+ sym = map__find_symbol(map, ip, symbol_filter);
} else {
/*
* If this is outside of all known maps,
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index e4b1004..400bef9 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -455,7 +455,7 @@ got_map:
dump_printf(" ...... map: %Lx -> %Lx\n", *ipp, ip);
*ipp = ip;

- return map ? map__find_function(map, ip, NULL) : NULL;
+ return map ? map__find_symbol(map, ip, NULL) : NULL;
}

static int call__match(struct symbol *sym)
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index a0168f2..abe78bb 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -948,7 +948,7 @@ static void event__process_sample(const event_t *self, int counter)
map = thread__find_map(thread, ip);
if (map != NULL) {
ip = map->map_ip(map, ip);
- sym = map__find_function(map, ip, symbol_filter);
+ sym = map__find_symbol(map, ip, symbol_filter);
if (sym == NULL)
return;
userspace_samples++;
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 29543bd..3ae3c96 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -81,7 +81,9 @@ typedef union event_union {
} event_t;

enum map_type {
- MAP__FUNCTION,
+ MAP__FUNCTION = 0,
+
+ MAP__NR_TYPES,
};

struct map {
@@ -125,10 +127,10 @@ 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_function(struct map *self, u64 ip,
- symbol_filter_t filter);
-void map__fixup_start(struct map *self, struct rb_root *symbols);
-void map__fixup_end(struct map *self, struct rb_root *symbols);
+struct symbol *map__find_symbol(struct map *self, u64 addr,
+ symbol_filter_t filter);
+void map__fixup_start(struct map *self);
+void map__fixup_end(struct map *self);

int event__synthesize_thread(pid_t pid, int (*process)(event_t *event));
void event__synthesize_threads(int (*process)(event_t *event));
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 52bb4c6..69f94fe 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -82,8 +82,9 @@ void map__delete(struct map *self)
free(self);
}

-void map__fixup_start(struct map *self, struct rb_root *symbols)
+void map__fixup_start(struct map *self)
{
+ struct rb_root *symbols = &self->dso->symbols[self->type];
struct rb_node *nd = rb_first(symbols);
if (nd != NULL) {
struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
@@ -91,8 +92,9 @@ void map__fixup_start(struct map *self, struct rb_root *symbols)
}
}

-void map__fixup_end(struct map *self, struct rb_root *symbols)
+void map__fixup_end(struct map *self)
{
+ struct rb_root *symbols = &self->dso->symbols[self->type];
struct rb_node *nd = rb_last(symbols);
if (nd != NULL) {
struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
@@ -102,8 +104,8 @@ void map__fixup_end(struct map *self, struct rb_root *symbols)

#define DSO__DELETED "(deleted)"

-struct symbol *map__find_function(struct map *self, u64 ip,
- symbol_filter_t filter)
+struct symbol *map__find_symbol(struct map *self, u64 addr,
+ symbol_filter_t filter)
{
if (!dso__loaded(self->dso, self->type)) {
int nr = dso__load(self->dso, self, filter);
@@ -138,7 +140,7 @@ struct symbol *map__find_function(struct map *self, u64 ip,
}
}

- return self->dso->find_function(self->dso, ip);
+ return self->dso->find_symbol(self->dso, self->type, addr);
}

struct map *map__clone(struct map *self)
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 45a4a9a..9a2dd81 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -31,6 +31,7 @@ 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 void kernel_maps__insert(struct map *map);
+struct symbol *dso__find_symbol(struct dso *self, enum map_type type, u64 addr);
static int dso__load_kernel_sym(struct dso *self, struct map *map,
symbol_filter_t filter);
unsigned int symbol__priv_size;
@@ -151,11 +152,13 @@ struct dso *dso__new(const char *name)
struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);

if (self != NULL) {
+ int i;
strcpy(self->name, name);
dso__set_long_name(self, self->name);
self->short_name = self->name;
- self->functions = RB_ROOT;
- self->find_function = dso__find_function;
+ for (i = 0; i < MAP__NR_TYPES; ++i)
+ self->symbols[i] = RB_ROOT;
+ self->find_symbol = dso__find_symbol;
self->slen_calculated = 0;
self->origin = DSO__ORIG_NOT_FOUND;
self->loaded = 0;
@@ -180,7 +183,9 @@ static void symbols__delete(struct rb_root *self)

void dso__delete(struct dso *self)
{
- symbols__delete(&self->functions);
+ int i;
+ for (i = 0; i < MAP__NR_TYPES; ++i)
+ symbols__delete(&self->symbols[i]);
if (self->long_name != self->name)
free(self->long_name);
free(self);
@@ -234,9 +239,9 @@ static struct symbol *symbols__find(struct rb_root *self, u64 ip)
return NULL;
}

-struct symbol *dso__find_function(struct dso *self, u64 ip)
+struct symbol *dso__find_symbol(struct dso *self, enum map_type type, u64 addr)
{
- return symbols__find(&self->functions, ip);
+ return symbols__find(&self->symbols[type], addr);
}

int build_id__sprintf(u8 *self, int len, char *bf)
@@ -262,17 +267,25 @@ size_t dso__fprintf_buildid(struct dso *self, FILE *fp)
return fprintf(fp, "%s", sbuild_id);
}

+static const char * map_type__name[MAP__NR_TYPES] = {
+ [MAP__FUNCTION] = "Functions",
+};
+
size_t dso__fprintf(struct dso *self, FILE *fp)
{
+ int i;
struct rb_node *nd;
size_t ret = fprintf(fp, "dso: %s (", self->short_name);

ret += dso__fprintf_buildid(self, fp);
- ret += fprintf(fp, ")\nFunctions:\n");
+ ret += fprintf(fp, ")\n");
+ for (i = 0; i < MAP__NR_TYPES; ++i) {
+ ret += fprintf(fp, "%s:\n", map_type__name[i]);

- for (nd = rb_first(&self->functions); nd; nd = rb_next(nd)) {
- struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
- ret += symbol__fprintf(pos, fp);
+ for (nd = rb_first(&self->symbols[i]); nd; nd = rb_next(nd)) {
+ struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
+ ret += symbol__fprintf(pos, fp);
+ }
}

return ret;
@@ -335,7 +348,7 @@ static int kernel_maps__load_all_kallsyms(void)
* kernel_maps__split_kallsyms, when we have split the
* maps per module
*/
- symbols__insert(&kernel_map__functions->dso->functions, sym);
+ symbols__insert(&kernel_map__functions->dso->symbols[MAP__FUNCTION], sym);
}

free(line);
@@ -359,7 +372,7 @@ static int kernel_maps__split_kallsyms(symbol_filter_t filter)
struct map *map = kernel_map__functions;
struct symbol *pos;
int count = 0;
- struct rb_node *next = rb_first(&kernel_map__functions->dso->functions);
+ struct rb_node *next = rb_first(&kernel_map__functions->dso->symbols[map->type]);
int kernel_range = 0;

while (next) {
@@ -409,13 +422,13 @@ static int kernel_maps__split_kallsyms(symbol_filter_t filter)
}

if (filter && filter(map, pos)) {
- rb_erase(&pos->rb_node, &kernel_map__functions->dso->functions);
+ rb_erase(&pos->rb_node, &kernel_map__functions->dso->symbols[map->type]);
symbol__delete(pos);
} else {
if (map != kernel_map__functions) {
rb_erase(&pos->rb_node,
- &kernel_map__functions->dso->functions);
- symbols__insert(&map->dso->functions, pos);
+ &kernel_map__functions->dso->symbols[map->type]);
+ symbols__insert(&map->dso->symbols[map->type], pos);
}
count++;
}
@@ -430,7 +443,7 @@ static int kernel_maps__load_kallsyms(symbol_filter_t filter)
if (kernel_maps__load_all_kallsyms())
return -1;

- symbols__fixup_end(&kernel_map__functions->dso->functions);
+ symbols__fixup_end(&kernel_map__functions->dso->symbols[MAP__FUNCTION]);
kernel_map__functions->dso->origin = DSO__ORIG_KERNEL;

return kernel_maps__split_kallsyms(filter);
@@ -501,7 +514,7 @@ static int dso__load_perf_map(struct dso *self, struct map *map,
if (filter && filter(map, sym))
symbol__delete(sym);
else {
- symbols__insert(&self->functions, sym);
+ symbols__insert(&self->symbols[map->type], sym);
nr_syms++;
}
}
@@ -699,7 +712,7 @@ static int dso__synthesize_plt_symbols(struct dso *self, struct map *map,
if (filter && filter(map, f))
symbol__delete(f);
else {
- symbols__insert(&self->functions, f);
+ symbols__insert(&self->symbols[map->type], f);
++nr;
}
}
@@ -721,7 +734,7 @@ static int dso__synthesize_plt_symbols(struct dso *self, struct map *map,
if (filter && filter(map, f))
symbol__delete(f);
else {
- symbols__insert(&self->functions, f);
+ symbols__insert(&self->symbols[map->type], f);
++nr;
}
}
@@ -896,7 +909,7 @@ new_symbol:
if (filter && filter(curr_map, f))
symbol__delete(f);
else {
- symbols__insert(&curr_dso->functions, f);
+ symbols__insert(&curr_dso->symbols[curr_map->type], f);
nr++;
}
}
@@ -905,7 +918,7 @@ new_symbol:
* For misannotated, zeroed, ASM function sizes.
*/
if (nr > 0)
- symbols__fixup_end(&self->functions);
+ symbols__fixup_end(&self->symbols[map->type]);
err = nr;
out_elf_end:
elf_end(elf);
@@ -1191,7 +1204,7 @@ struct symbol *kernel_maps__find_function(u64 ip, struct map **mapp,

if (map) {
ip = map->map_ip(map, ip);
- return map__find_function(map, ip, filter);
+ return map__find_symbol(map, ip, filter);
} else
WARN_ONCE(RB_EMPTY_ROOT(&kernel_maps__functions),
"Empty kernel_maps, was symbol__init() called?\n");
@@ -1453,8 +1466,8 @@ do_kallsyms:

if (err > 0) {
out_fixup:
- map__fixup_start(map, &map->dso->functions);
- map__fixup_end(map, &map->dso->functions);
+ map__fixup_start(map);
+ map__fixup_end(map);
}

return err;
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 11d4195..8934814 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -65,8 +65,9 @@ static inline void *symbol__priv(struct symbol *self)

struct dso {
struct list_head node;
- struct rb_root functions;
- struct symbol *(*find_function)(struct dso *, u64 ip);
+ struct rb_root symbols[MAP__NR_TYPES];
+ struct symbol *(*find_symbol)(struct dso *self,
+ enum map_type type, u64 addr);
u8 adjust_symbols:1;
u8 slen_calculated:1;
u8 has_build_id:1;
@@ -83,8 +84,6 @@ struct dso {
struct dso *dso__new(const char *name);
void dso__delete(struct dso *self);

-struct symbol *dso__find_function(struct dso *self, u64 ip);
-
bool dso__loaded(const struct dso *self, enum map_type type);

struct dso *dsos__findnew(const char *name);
--
1.6.2.5
--
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