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perf tools: Protect accesses the dso rbtrees/lists with a rw lock

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To allow concurrent access, next step: refcount struct dso instances, so
that we can ditch unused them when the last map pointing to it goes
away.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/n/tip-yk1k08etpd2aoe3tnrf0oizn@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
2015-06-01 15:40:01 -03:00
parent 9f2de31542
commit e880784422
4 changed files with 95 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
tools/perf/util/dso.c
View File

@@ -889,8 +889,8 @@ struct dso *machine__findnew_kernel(struct machine *machine, const char *name,
* Either one of the dso or name parameter must be non-NULL or the * Either one of the dso or name parameter must be non-NULL or the
* function will not work. * function will not work.
*/ */
static struct dso *dso__findlink_by_longname(struct rb_root *root, static struct dso *__dso__findlink_by_longname(struct rb_root *root,
struct dso *dso, const char *name) struct dso *dso, const char *name)
{ {
struct rb_node **p = &root->rb_node; struct rb_node **p = &root->rb_node;
struct rb_node *parent = NULL; struct rb_node *parent = NULL;
@@ -937,10 +937,10 @@ static struct dso *dso__findlink_by_longname(struct rb_root *root,
return NULL; return NULL;
} }
static inline struct dso * static inline struct dso *__dso__find_by_longname(struct rb_root *root,
dso__find_by_longname(const struct rb_root *root, const char *name) const char *name)
{ {
return dso__findlink_by_longname((struct rb_root *)root, NULL, name); return __dso__findlink_by_longname(root, NULL, name);
} }
void dso__set_long_name(struct dso *dso, const char *name, bool name_allocated) void dso__set_long_name(struct dso *dso, const char *name, bool name_allocated)
@@ -1149,14 +1149,20 @@ bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
return have_build_id; return have_build_id;
} }
void dsos__add(struct dsos *dsos, struct dso *dso) void __dsos__add(struct dsos *dsos, struct dso *dso)
{ {
list_add_tail(&dso->node, &dsos->head); list_add_tail(&dso->node, &dsos->head);
dso__findlink_by_longname(&dsos->root, dso, NULL); __dso__findlink_by_longname(&dsos->root, dso, NULL);
} }
struct dso *dsos__find(const struct dsos *dsos, const char *name, void dsos__add(struct dsos *dsos, struct dso *dso)
bool cmp_short) {
pthread_rwlock_wrlock(&dsos->lock);
__dsos__add(dsos, dso);
pthread_rwlock_unlock(&dsos->lock);
}
struct dso *__dsos__find(struct dsos *dsos, const char *name, bool cmp_short)
{ {
struct dso *pos; struct dso *pos;
@@ -1166,15 +1172,24 @@ struct dso *dsos__find(const struct dsos *dsos, const char *name,
return pos; return pos;
return NULL; return NULL;
} }
return dso__find_by_longname(&dsos->root, name); return __dso__find_by_longname(&dsos->root, name);
} }
struct dso *dsos__addnew(struct dsos *dsos, const char *name) struct dso *dsos__find(struct dsos *dsos, const char *name, bool cmp_short)
{
struct dso *dso;
pthread_rwlock_rdlock(&dsos->lock);
dso = __dsos__find(dsos, name, cmp_short);
pthread_rwlock_unlock(&dsos->lock);
return dso;
}
struct dso *__dsos__addnew(struct dsos *dsos, const char *name)
{ {
struct dso *dso = dso__new(name); struct dso *dso = dso__new(name);
if (dso != NULL) { if (dso != NULL) {
dsos__add(dsos, dso); __dsos__add(dsos, dso);
dso__set_basename(dso); dso__set_basename(dso);
} }
return dso; return dso;
@@ -1182,9 +1197,18 @@ struct dso *dsos__addnew(struct dsos *dsos, const char *name)
struct dso *__dsos__findnew(struct dsos *dsos, const char *name) struct dso *__dsos__findnew(struct dsos *dsos, const char *name)
{ {
struct dso *dso = dsos__find(dsos, name, false); struct dso *dso = __dsos__find(dsos, name, false);
return dso ? dso : dsos__addnew(dsos, name); return dso ? dso : __dsos__addnew(dsos, name);
}
struct dso *dsos__findnew(struct dsos *dsos, const char *name)
{
struct dso *dso;
pthread_rwlock_wrlock(&dsos->lock);
dso = __dsos__findnew(dsos, name);
pthread_rwlock_unlock(&dsos->lock);
return dso;
} }
size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp, size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,

10
tools/perf/util/dso.h
View File

@@ -4,6 +4,7 @@
#include <linux/types.h> #include <linux/types.h>
#include <linux/rbtree.h> #include <linux/rbtree.h>
#include <stdbool.h> #include <stdbool.h>
#include <pthread.h>
#include <linux/types.h> #include <linux/types.h>
#include <linux/bitops.h> #include <linux/bitops.h>
#include "map.h" #include "map.h"
@@ -124,6 +125,7 @@ struct dso_cache {
struct dsos { struct dsos {
struct list_head head; struct list_head head;
struct rb_root root; /* rbtree root sorted by long name */ struct rb_root root; /* rbtree root sorted by long name */
pthread_rwlock_t lock;
}; };
struct auxtrace_cache; struct auxtrace_cache;
@@ -297,11 +299,13 @@ struct map *dso__new_map(const char *name);
struct dso *machine__findnew_kernel(struct machine *machine, const char *name, struct dso *machine__findnew_kernel(struct machine *machine, const char *name,
const char *short_name, int dso_type); const char *short_name, int dso_type);
void __dsos__add(struct dsos *dsos, struct dso *dso);
void dsos__add(struct dsos *dsos, struct dso *dso); void dsos__add(struct dsos *dsos, struct dso *dso);
struct dso *dsos__addnew(struct dsos *dsos, const char *name); struct dso *__dsos__addnew(struct dsos *dsos, const char *name);
struct dso *dsos__find(const struct dsos *dsos, const char *name, struct dso *__dsos__find(struct dsos *dsos, const char *name, bool cmp_short);
bool cmp_short); struct dso *dsos__find(struct dsos *dsos, const char *name, bool cmp_short);
struct dso *__dsos__findnew(struct dsos *dsos, const char *name); struct dso *__dsos__findnew(struct dsos *dsos, const char *name);
struct dso *dsos__findnew(struct dsos *dsos, const char *name);
bool __dsos__read_build_ids(struct list_head *head, bool with_hits); bool __dsos__read_build_ids(struct list_head *head, bool with_hits);
size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp, size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,

27
tools/perf/util/machine.c
View File

@@ -20,6 +20,7 @@ static void dsos__init(struct dsos *dsos)
{ {
INIT_LIST_HEAD(&dsos->head); INIT_LIST_HEAD(&dsos->head);
dsos->root = RB_ROOT; dsos->root = RB_ROOT;
pthread_rwlock_init(&dsos->lock, NULL);
} }
int machine__init(struct machine *machine, const char *root_dir, pid_t pid) int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
@@ -81,15 +82,21 @@ out_delete:
return NULL; return NULL;
} }
static void dsos__delete(struct dsos *dsos) static void dsos__exit(struct dsos *dsos)
{ {
struct dso *pos, *n; struct dso *pos, *n;
pthread_rwlock_wrlock(&dsos->lock);
list_for_each_entry_safe(pos, n, &dsos->head, node) { list_for_each_entry_safe(pos, n, &dsos->head, node) {
RB_CLEAR_NODE(&pos->rb_node); RB_CLEAR_NODE(&pos->rb_node);
list_del(&pos->node); list_del(&pos->node);
dso__delete(pos); dso__delete(pos);
} }
pthread_rwlock_unlock(&dsos->lock);
pthread_rwlock_destroy(&dsos->lock);
} }
void machine__delete_threads(struct machine *machine) void machine__delete_threads(struct machine *machine)
@@ -110,7 +117,7 @@ void machine__delete_threads(struct machine *machine)
void machine__exit(struct machine *machine) void machine__exit(struct machine *machine)
{ {
map_groups__exit(&machine->kmaps); map_groups__exit(&machine->kmaps);
dsos__delete(&machine->dsos); dsos__exit(&machine->dsos);
machine__exit_vdso(machine); machine__exit_vdso(machine);
zfree(&machine->root_dir); zfree(&machine->root_dir);
zfree(&machine->current_tid); zfree(&machine->current_tid);
@@ -496,11 +503,13 @@ static struct dso *machine__findnew_module_dso(struct machine *machine,
{ {
struct dso *dso; struct dso *dso;
dso = dsos__find(&machine->dsos, m->name, true); pthread_rwlock_wrlock(&machine->dsos.lock);
dso = __dsos__find(&machine->dsos, m->name, true);
if (!dso) { if (!dso) {
dso = dsos__addnew(&machine->dsos, m->name); dso = __dsos__addnew(&machine->dsos, m->name);
if (dso == NULL) if (dso == NULL)
return NULL; goto out_unlock;
if (machine__is_host(machine)) if (machine__is_host(machine))
dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE; dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE;
@@ -515,6 +524,8 @@ static struct dso *machine__findnew_module_dso(struct machine *machine,
dso__set_long_name(dso, strdup(filename), true); dso__set_long_name(dso, strdup(filename), true);
} }
out_unlock:
pthread_rwlock_unlock(&machine->dsos.lock);
return dso; return dso;
} }
@@ -1156,6 +1167,8 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
struct dso *kernel = NULL; struct dso *kernel = NULL;
struct dso *dso; struct dso *dso;
pthread_rwlock_rdlock(&machine->dsos.lock);
list_for_each_entry(dso, &machine->dsos.head, node) { list_for_each_entry(dso, &machine->dsos.head, node) {
/* /*
@@ -1184,6 +1197,8 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
break; break;
} }
pthread_rwlock_unlock(&machine->dsos.lock);
if (kernel == NULL) if (kernel == NULL)
kernel = machine__findnew_dso(machine, kmmap_prefix); kernel = machine__findnew_dso(machine, kmmap_prefix);
if (kernel == NULL) if (kernel == NULL)
@@ -1948,5 +1963,5 @@ int machine__get_kernel_start(struct machine *machine)
struct dso *machine__findnew_dso(struct machine *machine, const char *filename) struct dso *machine__findnew_dso(struct machine *machine, const char *filename)
{ {
return __dsos__findnew(&machine->dsos, filename); return dsos__findnew(&machine->dsos, filename);
} }

53
tools/perf/util/vdso.c
View File

@@ -120,14 +120,14 @@ void machine__exit_vdso(struct machine *machine)
zfree(&machine->vdso_info); zfree(&machine->vdso_info);
} }
static struct dso *machine__addnew_vdso(struct machine *machine, const char *short_name, static struct dso *__machine__addnew_vdso(struct machine *machine, const char *short_name,
const char *long_name) const char *long_name)
{ {
struct dso *dso; struct dso *dso;
dso = dso__new(short_name); dso = dso__new(short_name);
if (dso != NULL) { if (dso != NULL) {
dsos__add(&machine->dsos, dso); __dsos__add(&machine->dsos, dso);
dso__set_long_name(dso, long_name, false); dso__set_long_name(dso, long_name, false);
} }
@@ -230,27 +230,31 @@ static const char *vdso__get_compat_file(struct vdso_file *vdso_file)
return vdso_file->temp_file_name; return vdso_file->temp_file_name;
} }
static struct dso *vdso__findnew_compat(struct machine *machine, static struct dso *__machine__findnew_compat(struct machine *machine,
struct vdso_file *vdso_file) struct vdso_file *vdso_file)
{ {
const char *file_name; const char *file_name;
struct dso *dso; struct dso *dso;
dso = dsos__find(&machine->dsos, vdso_file->dso_name, true); pthread_rwlock_wrlock(&machine->dsos.lock);
dso = __dsos__find(&machine->dsos, vdso_file->dso_name, true);
if (dso) if (dso)
return dso; goto out_unlock;
file_name = vdso__get_compat_file(vdso_file); file_name = vdso__get_compat_file(vdso_file);
if (!file_name) if (!file_name)
return NULL; goto out_unlock;
return machine__addnew_vdso(machine, vdso_file->dso_name, file_name); dso = __machine__addnew_vdso(machine, vdso_file->dso_name, file_name);
out_unlock:
pthread_rwlock_unlock(&machine->dsos.lock);
return dso;
} }
static int machine__findnew_vdso_compat(struct machine *machine, static int __machine__findnew_vdso_compat(struct machine *machine,
struct thread *thread, struct thread *thread,
struct vdso_info *vdso_info, struct vdso_info *vdso_info,
struct dso **dso) struct dso **dso)
{ {
enum dso_type dso_type; enum dso_type dso_type;
@@ -267,10 +271,10 @@ static int machine__findnew_vdso_compat(struct machine *machine,
switch (dso_type) { switch (dso_type) {
case DSO__TYPE_32BIT: case DSO__TYPE_32BIT:
*dso = vdso__findnew_compat(machine, &vdso_info->vdso32); *dso = __machine__findnew_compat(machine, &vdso_info->vdso32);
return 1; return 1;
case DSO__TYPE_X32BIT: case DSO__TYPE_X32BIT:
*dso = vdso__findnew_compat(machine, &vdso_info->vdsox32); *dso = __machine__findnew_compat(machine, &vdso_info->vdsox32);
return 1; return 1;
case DSO__TYPE_UNKNOWN: case DSO__TYPE_UNKNOWN:
case DSO__TYPE_64BIT: case DSO__TYPE_64BIT:
@@ -285,31 +289,32 @@ struct dso *machine__findnew_vdso(struct machine *machine,
struct thread *thread __maybe_unused) struct thread *thread __maybe_unused)
{ {
struct vdso_info *vdso_info; struct vdso_info *vdso_info;
struct dso *dso; struct dso *dso = NULL;
pthread_rwlock_wrlock(&machine->dsos.lock);
if (!machine->vdso_info) if (!machine->vdso_info)
machine->vdso_info = vdso_info__new(); machine->vdso_info = vdso_info__new();
vdso_info = machine->vdso_info; vdso_info = machine->vdso_info;
if (!vdso_info) if (!vdso_info)
return NULL; goto out_unlock;
#if BITS_PER_LONG == 64 #if BITS_PER_LONG == 64
if (machine__findnew_vdso_compat(machine, thread, vdso_info, &dso)) if (__machine__findnew_vdso_compat(machine, thread, vdso_info, &dso))
return dso; goto out_unlock;
#endif #endif
dso = dsos__find(&machine->dsos, DSO__NAME_VDSO, true); dso = __dsos__find(&machine->dsos, DSO__NAME_VDSO, true);
if (!dso) { if (!dso) {
char *file; char *file;
file = get_file(&vdso_info->vdso); file = get_file(&vdso_info->vdso);
if (!file) if (file)
return NULL; dso = __machine__addnew_vdso(machine, DSO__NAME_VDSO, file);
dso = machine__addnew_vdso(machine, DSO__NAME_VDSO, file);
} }
out_unlock:
pthread_rwlock_unlock(&machine->dsos.lock);
return dso; return dso;
} }