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-rw-r--r--tools/perf/builtin-sched.c159
1 files changed, 128 insertions, 31 deletions
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 5275bab70313..33962612a5e9 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -95,6 +95,7 @@ struct work_atoms {
u64 total_lat;
u64 nb_atoms;
u64 total_runtime;
+ int num_merged;
};
typedef int (*sort_fn_t)(struct work_atoms *, struct work_atoms *);
@@ -168,9 +169,10 @@ struct perf_sched {
u64 all_runtime;
u64 all_count;
u64 cpu_last_switched[MAX_CPUS];
- struct rb_root atom_root, sorted_atom_root;
+ struct rb_root atom_root, sorted_atom_root, merged_atom_root;
struct list_head sort_list, cmp_pid;
bool force;
+ bool skip_merge;
};
static u64 get_nsecs(void)
@@ -770,7 +772,7 @@ static int replay_fork_event(struct perf_sched *sched,
if (child == NULL || parent == NULL) {
pr_debug("thread does not exist on fork event: child %p, parent %p\n",
child, parent);
- return 0;
+ goto out_put;
}
if (verbose) {
@@ -781,6 +783,9 @@ static int replay_fork_event(struct perf_sched *sched,
register_pid(sched, parent->tid, thread__comm_str(parent));
register_pid(sched, child->tid, thread__comm_str(child));
+out_put:
+ thread__put(child);
+ thread__put(parent);
return 0;
}
@@ -957,7 +962,7 @@ static int latency_switch_event(struct perf_sched *sched,
struct work_atoms *out_events, *in_events;
struct thread *sched_out, *sched_in;
u64 timestamp0, timestamp = sample->time;
- int cpu = sample->cpu;
+ int cpu = sample->cpu, err = -1;
s64 delta;
BUG_ON(cpu >= MAX_CPUS || cpu < 0);
@@ -976,15 +981,17 @@ static int latency_switch_event(struct perf_sched *sched,
sched_out = machine__findnew_thread(machine, -1, prev_pid);
sched_in = machine__findnew_thread(machine, -1, next_pid);
+ if (sched_out == NULL || sched_in == NULL)
+ goto out_put;
out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
if (!out_events) {
if (thread_atoms_insert(sched, sched_out))
- return -1;
+ goto out_put;
out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
if (!out_events) {
pr_err("out-event: Internal tree error");
- return -1;
+ goto out_put;
}
}
if (add_sched_out_event(out_events, sched_out_state(prev_state), timestamp))
@@ -993,22 +1000,25 @@ static int latency_switch_event(struct perf_sched *sched,
in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
if (!in_events) {
if (thread_atoms_insert(sched, sched_in))
- return -1;
+ goto out_put;
in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
if (!in_events) {
pr_err("in-event: Internal tree error");
- return -1;
+ goto out_put;
}
/*
* Take came in we have not heard about yet,
* add in an initial atom in runnable state:
*/
if (add_sched_out_event(in_events, 'R', timestamp))
- return -1;
+ goto out_put;
}
add_sched_in_event(in_events, timestamp);
-
- return 0;
+ err = 0;
+out_put:
+ thread__put(sched_out);
+ thread__put(sched_in);
+ return err;
}
static int latency_runtime_event(struct perf_sched *sched,
@@ -1021,23 +1031,29 @@ static int latency_runtime_event(struct perf_sched *sched,
struct thread *thread = machine__findnew_thread(machine, -1, pid);
struct work_atoms *atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
u64 timestamp = sample->time;
- int cpu = sample->cpu;
+ int cpu = sample->cpu, err = -1;
+
+ if (thread == NULL)
+ return -1;
BUG_ON(cpu >= MAX_CPUS || cpu < 0);
if (!atoms) {
if (thread_atoms_insert(sched, thread))
- return -1;
+ goto out_put;
atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
if (!atoms) {
pr_err("in-event: Internal tree error");
- return -1;
+ goto out_put;
}
if (add_sched_out_event(atoms, 'R', timestamp))
- return -1;
+ goto out_put;
}
add_runtime_event(atoms, runtime, timestamp);
- return 0;
+ err = 0;
+out_put:
+ thread__put(thread);
+ return err;
}
static int latency_wakeup_event(struct perf_sched *sched,
@@ -1050,19 +1066,22 @@ static int latency_wakeup_event(struct perf_sched *sched,
struct work_atom *atom;
struct thread *wakee;
u64 timestamp = sample->time;
+ int err = -1;
wakee = machine__findnew_thread(machine, -1, pid);
+ if (wakee == NULL)
+ return -1;
atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
if (!atoms) {
if (thread_atoms_insert(sched, wakee))
- return -1;
+ goto out_put;
atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
if (!atoms) {
pr_err("wakeup-event: Internal tree error");
- return -1;
+ goto out_put;
}
if (add_sched_out_event(atoms, 'S', timestamp))
- return -1;
+ goto out_put;
}
BUG_ON(list_empty(&atoms->work_list));
@@ -1081,17 +1100,21 @@ static int latency_wakeup_event(struct perf_sched *sched,
* skip in this case.
*/
if (sched->profile_cpu == -1 && atom->state != THREAD_SLEEPING)
- return 0;
+ goto out_ok;
sched->nr_timestamps++;
if (atom->sched_out_time > timestamp) {
sched->nr_unordered_timestamps++;
- return 0;
+ goto out_ok;
}
atom->state = THREAD_WAIT_CPU;
atom->wake_up_time = timestamp;
- return 0;
+out_ok:
+ err = 0;
+out_put:
+ thread__put(wakee);
+ return err;
}
static int latency_migrate_task_event(struct perf_sched *sched,
@@ -1104,6 +1127,7 @@ static int latency_migrate_task_event(struct perf_sched *sched,
struct work_atoms *atoms;
struct work_atom *atom;
struct thread *migrant;
+ int err = -1;
/*
* Only need to worry about migration when profiling one CPU.
@@ -1112,18 +1136,20 @@ static int latency_migrate_task_event(struct perf_sched *sched,
return 0;
migrant = machine__findnew_thread(machine, -1, pid);
+ if (migrant == NULL)
+ return -1;
atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
if (!atoms) {
if (thread_atoms_insert(sched, migrant))
- return -1;
+ goto out_put;
register_pid(sched, migrant->tid, thread__comm_str(migrant));
atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
if (!atoms) {
pr_err("migration-event: Internal tree error");
- return -1;
+ goto out_put;
}
if (add_sched_out_event(atoms, 'R', timestamp))
- return -1;
+ goto out_put;
}
BUG_ON(list_empty(&atoms->work_list));
@@ -1135,8 +1161,10 @@ static int latency_migrate_task_event(struct perf_sched *sched,
if (atom->sched_out_time > timestamp)
sched->nr_unordered_timestamps++;
-
- return 0;
+ err = 0;
+out_put:
+ thread__put(migrant);
+ return err;
}
static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_list)
@@ -1156,7 +1184,10 @@ static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_
sched->all_runtime += work_list->total_runtime;
sched->all_count += work_list->nb_atoms;
- ret = printf(" %s:%d ", thread__comm_str(work_list->thread), work_list->thread->tid);
+ if (work_list->num_merged > 1)
+ ret = printf(" %s:(%d) ", thread__comm_str(work_list->thread), work_list->num_merged);
+ else
+ ret = printf(" %s:%d ", thread__comm_str(work_list->thread), work_list->thread->tid);
for (i = 0; i < 24 - ret; i++)
printf(" ");
@@ -1276,17 +1307,22 @@ static int sort_dimension__add(const char *tok, struct list_head *list)
static void perf_sched__sort_lat(struct perf_sched *sched)
{
struct rb_node *node;
-
+ struct rb_root *root = &sched->atom_root;
+again:
for (;;) {
struct work_atoms *data;
- node = rb_first(&sched->atom_root);
+ node = rb_first(root);
if (!node)
break;
- rb_erase(node, &sched->atom_root);
+ rb_erase(node, root);
data = rb_entry(node, struct work_atoms, node);
__thread_latency_insert(&sched->sorted_atom_root, data, &sched->sort_list);
}
+ if (root == &sched->atom_root) {
+ root = &sched->merged_atom_root;
+ goto again;
+ }
}
static int process_sched_wakeup_event(struct perf_tool *tool,
@@ -1330,8 +1366,10 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
}
sched_in = machine__findnew_thread(machine, -1, next_pid);
+ if (sched_in == NULL)
+ return -1;
- sched->curr_thread[this_cpu] = sched_in;
+ sched->curr_thread[this_cpu] = thread__get(sched_in);
printf(" ");
@@ -1381,6 +1419,8 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
printf("\n");
}
+ thread__put(sched_in);
+
return 0;
}
@@ -1542,6 +1582,59 @@ static void print_bad_events(struct perf_sched *sched)
}
}
+static void __merge_work_atoms(struct rb_root *root, struct work_atoms *data)
+{
+ struct rb_node **new = &(root->rb_node), *parent = NULL;
+ struct work_atoms *this;
+ const char *comm = thread__comm_str(data->thread), *this_comm;
+
+ while (*new) {
+ int cmp;
+
+ this = container_of(*new, struct work_atoms, node);
+ parent = *new;
+
+ this_comm = thread__comm_str(this->thread);
+ cmp = strcmp(comm, this_comm);
+ if (cmp > 0) {
+ new = &((*new)->rb_left);
+ } else if (cmp < 0) {
+ new = &((*new)->rb_right);
+ } else {
+ this->num_merged++;
+ this->total_runtime += data->total_runtime;
+ this->nb_atoms += data->nb_atoms;
+ this->total_lat += data->total_lat;
+ list_splice(&data->work_list, &this->work_list);
+ if (this->max_lat < data->max_lat) {
+ this->max_lat = data->max_lat;
+ this->max_lat_at = data->max_lat_at;
+ }
+ zfree(&data);
+ return;
+ }
+ }
+
+ data->num_merged++;
+ rb_link_node(&data->node, parent, new);
+ rb_insert_color(&data->node, root);
+}
+
+static void perf_sched__merge_lat(struct perf_sched *sched)
+{
+ struct work_atoms *data;
+ struct rb_node *node;
+
+ if (sched->skip_merge)
+ return;
+
+ while ((node = rb_first(&sched->atom_root))) {
+ rb_erase(node, &sched->atom_root);
+ data = rb_entry(node, struct work_atoms, node);
+ __merge_work_atoms(&sched->merged_atom_root, data);
+ }
+}
+
static int perf_sched__lat(struct perf_sched *sched)
{
struct rb_node *next;
@@ -1551,6 +1644,7 @@ static int perf_sched__lat(struct perf_sched *sched)
if (perf_sched__read_events(sched))
return -1;
+ perf_sched__merge_lat(sched);
perf_sched__sort_lat(sched);
printf("\n -----------------------------------------------------------------------------------------------------------------\n");
@@ -1702,6 +1796,7 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
.profile_cpu = -1,
.next_shortname1 = 'A',
.next_shortname2 = '0',
+ .skip_merge = 0,
};
const struct option latency_options[] = {
OPT_STRING('s', "sort", &sched.sort_order, "key[,key2...]",
@@ -1712,6 +1807,8 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
"CPU to profile on"),
OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
"dump raw trace in ASCII"),
+ OPT_BOOLEAN('p', "pids", &sched.skip_merge,
+ "latency stats per pid instead of per comm"),
OPT_END()
};
const struct option replay_options[] = {
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.