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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

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

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