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perf tools: Replace map->referenced & maps->removed_maps with map->re…
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…fcnt

Use just reference counts, so that when no more hist_entry instances
references a map and the thread instance goes away by processing a
PERF_RECORD_EXIT, we can delete the maps.

Cc: Adrian Hunter <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Don Zickus <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
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@acmel
acmel committed Jun 16, 2015
1 parent 35a23ff commit 5c24b67
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Showing 3 changed files with 32 additions and 73 deletions.
37 changes: 22 additions & 15 deletions tools/perf/util/hist.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -313,8 +313,7 @@ static struct hist_entry *hist_entry__new(struct hist_entry *template,
memset(&he->stat, 0, sizeof(he->stat));
}

if (he->ms.map)
he->ms.map->referenced = true;
map__get(he->ms.map);

if (he->branch_info) {
/*
Expand All @@ -324,6 +323,7 @@ static struct hist_entry *hist_entry__new(struct hist_entry *template,
*/
he->branch_info = malloc(sizeof(*he->branch_info));
if (he->branch_info == NULL) {
map__zput(he->ms.map);
free(he->stat_acc);
free(he);
return NULL;
Expand All @@ -332,17 +332,13 @@ static struct hist_entry *hist_entry__new(struct hist_entry *template,
memcpy(he->branch_info, template->branch_info,
sizeof(*he->branch_info));

if (he->branch_info->from.map)
he->branch_info->from.map->referenced = true;
if (he->branch_info->to.map)
he->branch_info->to.map->referenced = true;
map__get(he->branch_info->from.map);
map__get(he->branch_info->to.map);
}

if (he->mem_info) {
if (he->mem_info->iaddr.map)
he->mem_info->iaddr.map->referenced = true;
if (he->mem_info->daddr.map)
he->mem_info->daddr.map->referenced = true;
map__get(he->mem_info->iaddr.map);
map__get(he->mem_info->daddr.map);
}

if (symbol_conf.use_callchain)
Expand Down Expand Up @@ -407,9 +403,8 @@ static struct hist_entry *hists__findnew_entry(struct hists *hists,
* the history counter to increment.
*/
if (he->ms.map != entry->ms.map) {
he->ms.map = entry->ms.map;
if (he->ms.map)
he->ms.map->referenced = true;
map__put(he->ms.map);
he->ms.map = map__get(entry->ms.map);
}
goto out;
}
Expand Down Expand Up @@ -933,8 +928,20 @@ hist_entry__collapse(struct hist_entry *left, struct hist_entry *right)
void hist_entry__delete(struct hist_entry *he)
{
thread__zput(he->thread);
zfree(&he->branch_info);
zfree(&he->mem_info);
map__zput(he->ms.map);

if (he->branch_info) {
map__zput(he->branch_info->from.map);
map__zput(he->branch_info->to.map);
zfree(&he->branch_info);
}

if (he->mem_info) {
map__zput(he->mem_info->iaddr.map);
map__zput(he->mem_info->daddr.map);
zfree(&he->mem_info);
}

zfree(&he->stat_acc);
free_srcline(he->srcline);
free_callchain(he->callchain);
Expand Down
58 changes: 2 additions & 56 deletions tools/perf/util/map.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -137,7 +137,6 @@ void map__init(struct map *map, enum map_type type,
map->unmap_ip = map__unmap_ip;
RB_CLEAR_NODE(&map->rb_node);
map->groups = NULL;
map->referenced = false;
map->erange_warned = false;
atomic_set(&map->refcnt, 1);
}
Expand Down Expand Up @@ -439,7 +438,6 @@ static void maps__init(struct maps *maps)
{
maps->entries = RB_ROOT;
pthread_rwlock_init(&maps->lock, NULL);
INIT_LIST_HEAD(&maps->removed_maps);
}

void map_groups__init(struct map_groups *mg, struct machine *machine)
Expand All @@ -466,21 +464,10 @@ static void __maps__purge(struct maps *maps)
}
}

static void __maps__purge_removed_maps(struct maps *maps)
{
struct map *pos, *n;

list_for_each_entry_safe(pos, n, &maps->removed_maps, node) {
list_del_init(&pos->node);
map__put(pos);
}
}

static void maps__exit(struct maps *maps)
{
pthread_rwlock_wrlock(&maps->lock);
__maps__purge(maps);
__maps__purge_removed_maps(maps);
pthread_rwlock_unlock(&maps->lock);
}

Expand All @@ -499,8 +486,6 @@ bool map_groups__empty(struct map_groups *mg)
for (i = 0; i < MAP__NR_TYPES; ++i) {
if (maps__first(&mg->maps[i]))
return false;
if (!list_empty(&mg->maps[i].removed_maps))
return false;
}

return true;
Expand Down Expand Up @@ -621,47 +606,14 @@ size_t __map_groups__fprintf_maps(struct map_groups *mg, enum map_type type,
return printed += maps__fprintf(&mg->maps[type], fp);
}

static size_t map_groups__fprintf_maps(struct map_groups *mg, FILE *fp)
size_t map_groups__fprintf(struct map_groups *mg, FILE *fp)
{
size_t printed = 0, i;
for (i = 0; i < MAP__NR_TYPES; ++i)
printed += __map_groups__fprintf_maps(mg, i, fp);
return printed;
}

static size_t __map_groups__fprintf_removed_maps(struct map_groups *mg,
enum map_type type, FILE *fp)
{
struct map *pos;
size_t printed = 0;

list_for_each_entry(pos, &mg->maps[type].removed_maps, node) {
printed += fprintf(fp, "Map:");
printed += map__fprintf(pos, fp);
if (verbose > 1) {
printed += dso__fprintf(pos->dso, type, fp);
printed += fprintf(fp, "--\n");
}
}
return printed;
}

static size_t map_groups__fprintf_removed_maps(struct map_groups *mg,
FILE *fp)
{
size_t printed = 0, i;
for (i = 0; i < MAP__NR_TYPES; ++i)
printed += __map_groups__fprintf_removed_maps(mg, i, fp);
return printed;
}

size_t map_groups__fprintf(struct map_groups *mg, FILE *fp)
{
size_t printed = map_groups__fprintf_maps(mg, fp);
printed += fprintf(fp, "Removed maps:\n");
return printed + map_groups__fprintf_removed_maps(mg, fp);
}

static int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)
{
struct rb_root *root;
Expand Down Expand Up @@ -719,13 +671,7 @@ static int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp
map__fprintf(after, fp);
}
put_map:
/*
* If we have references, just move them to a separate list.
*/
if (pos->referenced)
list_add_tail(&pos->node, &maps->removed_maps);
else
map__put(pos);
map__put(pos);

if (err)
goto out;
Expand Down
10 changes: 8 additions & 2 deletions tools/perf/util/map.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,6 @@ struct map {
u64 start;
u64 end;
u8 /* enum map_type */ type;
bool referenced;
bool erange_warned;
u32 priv;
u32 prot;
Expand Down Expand Up @@ -63,7 +62,6 @@ struct kmap {
struct maps {
struct rb_root entries;
pthread_rwlock_t lock;
struct list_head removed_maps;
};

struct map_groups {
Expand Down Expand Up @@ -161,6 +159,14 @@ static inline struct map *map__get(struct map *map)

void map__put(struct map *map);

static inline void __map__zput(struct map **map)
{
map__put(*map);
*map = NULL;
}

#define map__zput(map) __map__zput(&map)

int map__overlap(struct map *l, struct map *r);
size_t map__fprintf(struct map *map, FILE *fp);
size_t map__fprintf_dsoname(struct map *map, FILE *fp);
Expand Down

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