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perf dsos: Tidy reference counting and locking

Browse source 
Move more functionality into dsos.c generally from machine.c, renaming
functions to match their new usage.

The find function is made to always "get" before returning a dso.

Reduce the scope of locks in vdso to match the locking paradigm.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Anne Macedo <retpolanne@posteo.net>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Ben Gainey <ben.gainey@arm.com>
Cc: Changbin Du <changbin.du@huawei.com>
Cc: Chengen Du <chengen.du@canonical.com>
Cc: Colin Ian King <colin.i.king@gmail.com>
Cc: Ilkka Koskinen <ilkka@os.amperecomputing.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Li Dong <lidong@vivo.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Markus Elfring <Markus.Elfring@web.de>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paran Lee <p4ranlee@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Song Liu <song@kernel.org>
Cc: Sun Haiyong <sunhaiyong@loongson.cn>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Yang Jihong <yangjihong1@huawei.com>
Cc: Yanteng Si <siyanteng@loongson.cn>
Cc: Yicong Yang <yangyicong@hisilicon.com>
Cc: zhaimingbing <zhaimingbing@cmss.chinamobile.com>
Link: https://lore.kernel.org/r/20240410064214.2755936-3-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2024-04-09 23:42:04 -07:00 committed by Arnaldo Carvalho de Melo
parent 83acca9f90
commit f649ed80f3
5 changed files with 97 additions and 99 deletions
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73
tools/perf/util/dsos.c
View file

@ -181,7 +181,7 @@ struct dso *__dsos__findnew_link_by_longname_id(struct rb_root *root, struct dso
* at the end of the list of duplicates.
*/
if (!dso || (dso == this))
return this; /* Find matching dso */
return dso__get(this); /* Find matching dso */
/*
* The core kernel DSOs may have duplicated long name.
* In this case, the short name should be different.
@ -253,15 +253,20 @@ static struct dso *__dsos__find_id(struct dsos *dsos, const char *name, struct d
if (cmp_short) {
list_for_each_entry(pos, &dsos->head, node)
if (__dso__cmp_short_name(name, id, pos) == 0)
return pos;
return dso__get(pos);
return NULL;
}
return __dsos__findnew_by_longname_id(&dsos->root, name, id);
}
struct dso *__dsos__find(struct dsos *dsos, const char *name, bool cmp_short)
struct dso *dsos__find(struct dsos *dsos, const char *name, bool cmp_short)
{
return __dsos__find_id(dsos, name, NULL, cmp_short);
struct dso *res;
down_read(&dsos->lock);
res = __dsos__find_id(dsos, name, NULL, cmp_short);
up_read(&dsos->lock);
return res;
}
static void dso__set_basename(struct dso *dso)
@ -303,8 +308,6 @@ static struct dso *__dsos__addnew_id(struct dsos *dsos, const char *name, struct
if (dso != NULL) {
__dsos__add(dsos, dso);
dso__set_basename(dso);
/* Put dso here because __dsos_add already got it */
dso__put(dso);
}
return dso;
}
@ -328,7 +331,7 @@ struct dso *dsos__findnew_id(struct dsos *dsos, const char *name, struct dso_id
{
struct dso *dso;
down_write(&dsos->lock);
dso = dso__get(__dsos__findnew_id(dsos, name, id));
dso = __dsos__findnew_id(dsos, name, id);
up_write(&dsos->lock);
return dso;
}
@ -374,3 +377,59 @@ int __dsos__hit_all(struct dsos *dsos)
return 0;
}
struct dso *dsos__findnew_module_dso(struct dsos *dsos,
struct machine *machine,
struct kmod_path *m,
const char *filename)
{
struct dso *dso;
down_write(&dsos->lock);
dso = __dsos__find_id(dsos, m->name, NULL, /*cmp_short=*/true);
if (!dso) {
dso = __dsos__addnew(dsos, m->name);
if (dso == NULL)
goto out_unlock;
dso__set_module_info(dso, m, machine);
dso__set_long_name(dso, strdup(filename), true);
dso->kernel = DSO_SPACE__KERNEL;
}
out_unlock:
up_write(&dsos->lock);
return dso;
}
struct dso *dsos__find_kernel_dso(struct dsos *dsos)
{
struct dso *dso, *res = NULL;
down_read(&dsos->lock);
list_for_each_entry(dso, &dsos->head, node) {
/*
* The cpumode passed to is_kernel_module is not the cpumode of
* *this* event. If we insist on passing correct cpumode to
* is_kernel_module, we should record the cpumode when we adding
* this dso to the linked list.
*
* However we don't really need passing correct cpumode. We
* know the correct cpumode must be kernel mode (if not, we
* should not link it onto kernel_dsos list).
*
* Therefore, we pass PERF_RECORD_MISC_CPUMODE_UNKNOWN.
* is_kernel_module() treats it as a kernel cpumode.
*/
if (!dso->kernel ||
is_kernel_module(dso->long_name,
PERF_RECORD_MISC_CPUMODE_UNKNOWN))
continue;
res = dso__get(dso);
break;
}
up_read(&dsos->lock);
return res;
}

9
tools/perf/util/dsos.h
View file

@ -10,6 +10,8 @@
struct dso;
struct dso_id;
struct kmod_path;
struct machine;
/*
* DSOs are put into both a list for fast iteration and rbtree for fast
@ -33,7 +35,7 @@ void dsos__exit(struct dsos *dsos);
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__find(struct dsos *dsos, const char *name, bool cmp_short);
struct dso *dsos__find(struct dsos *dsos, const char *name, bool cmp_short);
struct dso *dsos__findnew_id(struct dsos *dsos, const char *name, struct dso_id *id);
@ -48,4 +50,9 @@ size_t __dsos__fprintf(struct dsos *dsos, FILE *fp);
int __dsos__hit_all(struct dsos *dsos);
struct dso *dsos__findnew_module_dso(struct dsos *dsos, struct machine *machine,
struct kmod_path *m, const char *filename);
struct dso *dsos__find_kernel_dso(struct dsos *dsos);
#endif /* __PERF_DSOS */

62
tools/perf/util/machine.c
View file

@ -646,31 +646,6 @@ int machine__process_lost_samples_event(struct machine *machine __maybe_unused,
return 0;
}
static struct dso *machine__findnew_module_dso(struct machine *machine,
struct kmod_path *m,
const char *filename)
{
struct dso *dso;
down_write(&machine->dsos.lock);
dso = __dsos__find(&machine->dsos, m->name, true);
if (!dso) {
dso = __dsos__addnew(&machine->dsos, m->name);
if (dso == NULL)
goto out_unlock;
dso__set_module_info(dso, m, machine);
dso__set_long_name(dso, strdup(filename), true);
dso->kernel = DSO_SPACE__KERNEL;
}
dso__get(dso);
out_unlock:
up_write(&machine->dsos.lock);
return dso;
}
int machine__process_aux_event(struct machine *machine __maybe_unused,
union perf_event *event)
{
@ -854,7 +829,7 @@ static struct map *machine__addnew_module_map(struct machine *machine, u64 start
if (kmod_path__parse_name(&m, filename))
return NULL;
dso = machine__findnew_module_dso(machine, &m, filename);
dso = dsos__findnew_module_dso(&machine->dsos, machine, &m, filename);
if (dso == NULL)
goto out;
@ -1663,40 +1638,7 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
* Should be there already, from the build-id table in
* the header.
*/
struct dso *kernel = NULL;
struct dso *dso;
down_read(&machine->dsos.lock);
list_for_each_entry(dso, &machine->dsos.head, node) {
/*
* The cpumode passed to is_kernel_module is not the
* cpumode of *this* event. If we insist on passing
* correct cpumode to is_kernel_module, we should
* record the cpumode when we adding this dso to the
* linked list.
*
* However we don't really need passing correct
* cpumode. We know the correct cpumode must be kernel
* mode (if not, we should not link it onto kernel_dsos
* list).
*
* Therefore, we pass PERF_RECORD_MISC_CPUMODE_UNKNOWN.
* is_kernel_module() treats it as a kernel cpumode.
*/
if (!dso->kernel ||
is_kernel_module(dso->long_name,
PERF_RECORD_MISC_CPUMODE_UNKNOWN))
continue;
kernel = dso__get(dso);
break;
}
up_read(&machine->dsos.lock);
struct dso *kernel = dsos__find_kernel_dso(&machine->dsos);
if (kernel == NULL)
kernel = machine__findnew_dso(machine, machine->mmap_name);

4
tools/perf/util/map.c
View file

@ -196,9 +196,7 @@ struct map *map__new(struct machine *machine, u64 start, u64 len,
* reading the header will have the build ID set and all future mmaps will
* have it missing.
*/
down_read(&machine->dsos.lock);
header_bid_dso = __dsos__find(&machine->dsos, filename, false);
up_read(&machine->dsos.lock);
header_bid_dso = dsos__find(&machine->dsos, filename, false);
if (header_bid_dso && header_bid_dso->header_build_id) {
dso__set_build_id(dso, &header_bid_dso->bid);
dso->header_build_id = 1;

48
tools/perf/util/vdso.c
View file

@ -133,8 +133,6 @@ static struct dso *__machine__addnew_vdso(struct machine *machine, const char *s
if (dso != NULL) {
__dsos__add(&machine->dsos, dso);
dso__set_long_name(dso, long_name, false);
/* Put dso here because __dsos_add already got it */
dso__put(dso);
}
return dso;
@ -252,17 +250,15 @@ static struct dso *__machine__findnew_compat(struct machine *machine,
const char *file_name;
struct dso *dso;
dso = __dsos__find(&machine->dsos, vdso_file->dso_name, true);
dso = dsos__find(&machine->dsos, vdso_file->dso_name, true);
if (dso)
goto out;
return dso;
file_name = vdso__get_compat_file(vdso_file);
if (!file_name)
goto out;
return NULL;
dso = __machine__addnew_vdso(machine, vdso_file->dso_name, file_name);
out:
return dso;
return __machine__addnew_vdso(machine, vdso_file->dso_name, file_name);
}
static int __machine__findnew_vdso_compat(struct machine *machine,
@ -308,21 +304,21 @@ static struct dso *machine__find_vdso(struct machine *machine,
dso_type = machine__thread_dso_type(machine, thread);
switch (dso_type) {
case DSO__TYPE_32BIT:
dso = __dsos__find(&machine->dsos, DSO__NAME_VDSO32, true);
dso = dsos__find(&machine->dsos, DSO__NAME_VDSO32, true);
if (!dso) {
dso = __dsos__find(&machine->dsos, DSO__NAME_VDSO,
true);
dso = dsos__find(&machine->dsos, DSO__NAME_VDSO,
true);
if (dso && dso_type != dso__type(dso, machine))
dso = NULL;
}
break;
case DSO__TYPE_X32BIT:
dso = __dsos__find(&machine->dsos, DSO__NAME_VDSOX32, true);
dso = dsos__find(&machine->dsos, DSO__NAME_VDSOX32, true);
break;
case DSO__TYPE_64BIT:
case DSO__TYPE_UNKNOWN:
default:
dso = __dsos__find(&machine->dsos, DSO__NAME_VDSO, true);
dso = dsos__find(&machine->dsos, DSO__NAME_VDSO, true);
break;
}
@ -334,37 +330,33 @@ struct dso *machine__findnew_vdso(struct machine *machine,
{
struct vdso_info *vdso_info;
struct dso *dso = NULL;
char *file;
down_write(&machine->dsos.lock);
if (!machine->vdso_info)
machine->vdso_info = vdso_info__new();
vdso_info = machine->vdso_info;
if (!vdso_info)
goto out_unlock;
return NULL;
dso = machine__find_vdso(machine, thread);
if (dso)
goto out_unlock;
return dso;
#if BITS_PER_LONG == 64
if (__machine__findnew_vdso_compat(machine, thread, vdso_info, &dso))
goto out_unlock;
return dso;
#endif
dso = __dsos__find(&machine->dsos, DSO__NAME_VDSO, true);
if (!dso) {
char *file;
dso = dsos__find(&machine->dsos, DSO__NAME_VDSO, true);
if (dso)
return dso;
file = get_file(&vdso_info->vdso);
if (file)
dso = __machine__addnew_vdso(machine, DSO__NAME_VDSO, file);
}
file = get_file(&vdso_info->vdso);
if (!file)
return NULL;
out_unlock:
dso__get(dso);
up_write(&machine->dsos.lock);
return dso;
return __machine__addnew_vdso(machine, DSO__NAME_VDSO, file);
}
bool dso__is_vdso(struct dso *dso)