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-rw-r--r--tools/perf/tests/dso-data.c4
-rw-r--r--tools/perf/tests/hists_common.c6
-rw-r--r--tools/perf/util/dso.c37
-rw-r--r--tools/perf/util/dso.h14
-rw-r--r--tools/perf/util/header.c1
-rw-r--r--tools/perf/util/machine.c15
-rw-r--r--tools/perf/util/map.c11
-rw-r--r--tools/perf/util/probe-finder.c2
-rw-r--r--tools/perf/util/symbol-elf.c2
-rw-r--r--tools/perf/util/symbol.c2
-rw-r--r--tools/perf/util/vdso.c1
11 files changed, 81 insertions, 14 deletions
diff --git a/tools/perf/tests/dso-data.c b/tools/perf/tests/dso-data.c
index 3e41c61bd861..a218aeaf56a0 100644
--- a/tools/perf/tests/dso-data.c
+++ b/tools/perf/tests/dso-data.c
@@ -166,7 +166,7 @@ int test__dso_data(void)
free(buf);
}
- dso__delete(dso);
+ dso__put(dso);
unlink(file);
return 0;
}
@@ -226,7 +226,7 @@ static void dsos__delete(int cnt)
struct dso *dso = dsos[i];
unlink(dso->name);
- dso__delete(dso);
+ dso__put(dso);
}
free(dsos);
diff --git a/tools/perf/tests/hists_common.c b/tools/perf/tests/hists_common.c
index 915f60af6a0e..ce80b274b097 100644
--- a/tools/perf/tests/hists_common.c
+++ b/tools/perf/tests/hists_common.c
@@ -134,11 +134,15 @@ struct machine *setup_fake_machine(struct machines *machines)
sym = symbol__new(fsym->start, fsym->length,
STB_GLOBAL, fsym->name);
- if (sym == NULL)
+ if (sym == NULL) {
+ dso__put(dso);
goto out;
+ }
symbols__insert(&dso->symbols[MAP__FUNCTION], sym);
}
+
+ dso__put(dso);
}
return machine;
diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index ff0204ac4321..7c0c08386a1d 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -1049,6 +1049,7 @@ struct dso *dso__new(const char *name)
INIT_LIST_HEAD(&dso->node);
INIT_LIST_HEAD(&dso->data.open_entry);
pthread_mutex_init(&dso->lock, NULL);
+ atomic_set(&dso->refcnt, 1);
}
return dso;
@@ -1083,6 +1084,19 @@ void dso__delete(struct dso *dso)
free(dso);
}
+struct dso *dso__get(struct dso *dso)
+{
+ if (dso)
+ atomic_inc(&dso->refcnt);
+ return dso;
+}
+
+void dso__put(struct dso *dso)
+{
+ if (dso && atomic_dec_and_test(&dso->refcnt))
+ dso__delete(dso);
+}
+
void dso__set_build_id(struct dso *dso, void *build_id)
{
memcpy(dso->build_id, build_id, sizeof(dso->build_id));
@@ -1153,6 +1167,27 @@ void __dsos__add(struct dsos *dsos, struct dso *dso)
{
list_add_tail(&dso->node, &dsos->head);
__dso__findlink_by_longname(&dsos->root, dso, NULL);
+ /*
+ * It is now in the linked list, grab a reference, then garbage collect
+ * this when needing memory, by looking at LRU dso instances in the
+ * list with atomic_read(&dso->refcnt) == 1, i.e. no references
+ * anywhere besides the one for the list, do, under a lock for the
+ * list: remove it from the list, then a dso__put(), that probably will
+ * be the last and will then call dso__delete(), end of life.
+ *
+ * That, or at the end of the 'struct machine' lifetime, when all
+ * 'struct dso' instances will be removed from the list, in
+ * dsos__exit(), if they have no other reference from some other data
+ * structure.
+ *
+ * E.g.: after processing a 'perf.data' file and storing references
+ * to objects instantiated while processing events, we will have
+ * references to the 'thread', 'map', 'dso' structs all from 'struct
+ * hist_entry' instances, but we may not need anything not referenced,
+ * so we might as well call machines__exit()/machines__delete() and
+ * garbage collect it.
+ */
+ dso__get(dso);
}
void dsos__add(struct dsos *dsos, struct dso *dso)
@@ -1206,7 +1241,7 @@ struct dso *dsos__findnew(struct dsos *dsos, const char *name)
{
struct dso *dso;
pthread_rwlock_wrlock(&dsos->lock);
- dso = __dsos__findnew(dsos, name);
+ dso = dso__get(__dsos__findnew(dsos, name));
pthread_rwlock_unlock(&dsos->lock);
return dso;
}
diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
index c16ab5d849c3..2fe98bb0e95b 100644
--- a/tools/perf/util/dso.h
+++ b/tools/perf/util/dso.h
@@ -1,6 +1,7 @@
#ifndef __PERF_DSO
#define __PERF_DSO
+#include <linux/atomic.h>
#include <linux/types.h>
#include <linux/rbtree.h>
#include <stdbool.h>
@@ -179,7 +180,7 @@ struct dso {
void *priv;
u64 db_id;
};
-
+ atomic_t refcnt;
char name[0];
};
@@ -206,6 +207,17 @@ void dso__set_long_name(struct dso *dso, const char *name, bool name_allocated);
int dso__name_len(const struct dso *dso);
+struct dso *dso__get(struct dso *dso);
+void dso__put(struct dso *dso);
+
+static inline void __dso__zput(struct dso **dso)
+{
+ dso__put(*dso);
+ *dso = NULL;
+}
+
+#define dso__zput(dso) __dso__zput(&dso)
+
bool dso__loaded(const struct dso *dso, enum map_type type);
bool dso__sorted_by_name(const struct dso *dso, enum map_type type);
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index ac5aaaeed7ff..21a77e7a171e 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1277,6 +1277,7 @@ static int __event_process_build_id(struct build_id_event *bev,
sbuild_id);
pr_debug("build id event received for %s: %s\n",
dso->long_name, sbuild_id);
+ dso__put(dso);
}
err = 0;
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 0cf56d6f073a..132e35765101 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -82,7 +82,7 @@ out_delete:
return NULL;
}
-static void dsos__exit(struct dsos *dsos)
+static void dsos__purge(struct dsos *dsos)
{
struct dso *pos, *n;
@@ -90,12 +90,16 @@ static void dsos__exit(struct dsos *dsos)
list_for_each_entry_safe(pos, n, &dsos->head, node) {
RB_CLEAR_NODE(&pos->rb_node);
- list_del(&pos->node);
- dso__delete(pos);
+ list_del_init(&pos->node);
+ dso__put(pos);
}
pthread_rwlock_unlock(&dsos->lock);
+}
+static void dsos__exit(struct dsos *dsos)
+{
+ dsos__purge(dsos);
pthread_rwlock_destroy(&dsos->lock);
}
@@ -524,6 +528,7 @@ static struct dso *machine__findnew_module_dso(struct machine *machine,
dso__set_long_name(dso, strdup(filename), true);
}
+ dso__get(dso);
out_unlock:
pthread_rwlock_unlock(&machine->dsos.lock);
return dso;
@@ -1205,8 +1210,10 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
goto out_problem;
kernel->kernel = kernel_type;
- if (__machine__create_kernel_maps(machine, kernel) < 0)
+ if (__machine__create_kernel_maps(machine, kernel) < 0) {
+ dso__put(kernel);
goto out_problem;
+ }
if (strstr(kernel->long_name, "vmlinux"))
dso__set_short_name(kernel, "[kernel.vmlinux]", false);
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 365011c233a6..1241ab989cf5 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -132,7 +132,7 @@ void map__init(struct map *map, enum map_type type,
map->end = end;
map->pgoff = pgoff;
map->reloc = 0;
- map->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);
@@ -198,6 +198,7 @@ struct map *map__new(struct machine *machine, u64 start, u64 len,
if (type != MAP__FUNCTION)
dso__set_loaded(dso, map->type);
}
+ dso__put(dso);
}
return map;
out_delete:
@@ -224,9 +225,15 @@ struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
return map;
}
-void map__delete(struct map *map)
+static void map__exit(struct map *map)
{
BUG_ON(!RB_EMPTY_NODE(&map->rb_node));
+ dso__zput(map->dso);
+}
+
+void map__delete(struct map *map)
+{
+ map__exit(map);
free(map);
}
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index c50da392e256..2da65a710893 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -130,7 +130,7 @@ struct debuginfo *debuginfo__new(const char *path)
continue;
dinfo = __debuginfo__new(buf);
}
- dso__delete(dso);
+ dso__put(dso);
out:
/* if failed to open all distro debuginfo, open given binary */
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index a93ba85509b2..65f7e389ae09 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -1016,7 +1016,7 @@ int dso__load_sym(struct dso *dso, struct map *map,
curr_map = map__new2(start, curr_dso,
map->type);
if (curr_map == NULL) {
- dso__delete(curr_dso);
+ dso__put(curr_dso);
goto out_elf_end;
}
if (adjust_kernel_syms) {
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index eaee5d32d39d..504f2d73b7ee 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -786,7 +786,7 @@ static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta,
curr_map = map__new2(pos->start, ndso, map->type);
if (curr_map == NULL) {
- dso__delete(ndso);
+ dso__put(ndso);
return -1;
}
diff --git a/tools/perf/util/vdso.c b/tools/perf/util/vdso.c
index c646c74c34f8..4b89118f158d 100644
--- a/tools/perf/util/vdso.c
+++ b/tools/perf/util/vdso.c
@@ -314,6 +314,7 @@ struct dso *machine__findnew_vdso(struct machine *machine,
}
out_unlock:
+ dso__get(dso);
pthread_rwlock_unlock(&machine->dsos.lock);
return dso;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.