[tip:perfcounters/core] perf sched: Add support for sched:sched_stat_runtime events

tip-bot for mingo
2009-09-15T09:37:41Z

Commit-ID: 39aeb52f99f2380c1f16036deed2f7bb8b2e0559
Gitweb: http://git.kernel.org/tip/39aeb52f99f2380c1f16036deed2f7bb8b2e0559
Author: mingo <mingo@europe.(none)>
AuthorDate: Mon, 14 Sep 2009 20:04:48 +0200
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Mon, 14 Sep 2009 20:08:23 +0200

perf sched: Add support for sched:sched_stat_runtime events

This allows more precise 'perf sched latency' output:

---------------------------------------------------------------------------------------
Task | Runtime ms | Switches | Average delay ms | Maximum delay ms |
---------------------------------------------------------------------------------------
ksoftirqd/0-4 | 0.010 ms | 2 | avg: 2.476 ms | max: 2.977 ms |
perf-12328 | 15.844 ms | 66 | avg: 1.118 ms | max: 9.979 ms |
bdi-default-235 | 0.009 ms | 1 | avg: 0.998 ms | max: 0.998 ms |
events/1-8 | 0.020 ms | 2 | avg: 0.998 ms | max: 0.998 ms |
events/0-7 | 0.018 ms | 2 | avg: 0.992 ms | max: 0.996 ms |
sleep-12329 | 0.742 ms | 3 | avg: 0.906 ms | max: 2.289 ms |
sshd-12122 | 0.163 ms | 2 | avg: 0.283 ms | max: 0.562 ms |
loop-getpid-lon-12322 | 1023.636 ms | 69 | avg: 0.208 ms | max: 5.996 ms |
loop-getpid-lon-12321 | 1038.638 ms | 5 | avg: 0.073 ms | max: 0.171 ms |
migration/1-5 | 0.000 ms | 1 | avg: 0.006 ms | max: 0.006 ms |
---------------------------------------------------------------------------------------
TOTAL: | 2079.078 ms | 153 |
-------------------------------------------------

Also, streamline the code a bit more, add asserts for various state
machine failures (they should be debugged if they occur) and fix
a few odd ends.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

---
tools/perf/builtin-sched.c | 264 +++++++++++++++++++++++++++++---------------
1 files changed, 173 insertions(+), 91 deletions(-)

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 93ef7b2..adcb563 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -50,7 +50,7 @@ static u64 sleep_measurement_overhead;

static unsigned long nr_tasks;

-struct sched_event;
+struct sched_atom;

struct task_desc {
unsigned long nr;
@@ -59,7 +59,7 @@ struct task_desc {

unsigned long nr_events;
unsigned long curr_event;
- struct sched_event **events;
+ struct sched_atom **atoms;

pthread_t thread;
sem_t sleep_sem;
@@ -76,7 +76,7 @@ enum sched_event_type {
SCHED_EVENT_WAKEUP,
};

-struct sched_event {
+struct sched_atom {
enum sched_event_type type;
u64 timestamp;
u64 duration;
@@ -137,8 +137,8 @@ struct work_atom {
u64 runtime;
};

-struct task_atoms {
- struct list_head atom_list;
+struct work_atoms {
+ struct list_head work_list;
struct thread *thread;
struct rb_node node;
u64 max_lat;
@@ -147,7 +147,7 @@ struct task_atoms {
u64 total_runtime;
};

-typedef int (*sort_fn_t)(struct task_atoms *, struct task_atoms *);
+typedef int (*sort_fn_t)(struct work_atoms *, struct work_atoms *);

static struct rb_root atom_root, sorted_atom_root;

@@ -220,10 +220,10 @@ static void calibrate_sleep_measurement_overhead(void)
printf("sleep measurement overhead: %Ld nsecs\n", min_delta);
}

-static struct sched_event *
+static struct sched_atom *
get_new_event(struct task_desc *task, u64 timestamp)
{
- struct sched_event *event = calloc(1, sizeof(*event));
+ struct sched_atom *event = calloc(1, sizeof(*event));
unsigned long idx = task->nr_events;
size_t size;

@@ -231,27 +231,27 @@ get_new_event(struct task_desc *task, u64 timestamp)
event->nr = idx;

task->nr_events++;
- size = sizeof(struct sched_event *) * task->nr_events;
- task->events = realloc(task->events, size);
- BUG_ON(!task->events);
+ size = sizeof(struct sched_atom *) * task->nr_events;
+ task->atoms = realloc(task->atoms, size);
+ BUG_ON(!task->atoms);

- task->events[idx] = event;
+ task->atoms[idx] = event;

return event;
}

-static struct sched_event *last_event(struct task_desc *task)
+static struct sched_atom *last_event(struct task_desc *task)
{
if (!task->nr_events)
return NULL;

- return task->events[task->nr_events - 1];
+ return task->atoms[task->nr_events - 1];
}

static void
add_sched_event_run(struct task_desc *task, u64 timestamp, u64 duration)
{
- struct sched_event *event, *curr_event = last_event(task);
+ struct sched_atom *event, *curr_event = last_event(task);

/*
* optimize an existing RUN event by merging this one
@@ -275,7 +275,7 @@ static void
add_sched_event_wakeup(struct task_desc *task, u64 timestamp,
struct task_desc *wakee)
{
- struct sched_event *event, *wakee_event;
+ struct sched_atom *event, *wakee_event;

event = get_new_event(task, timestamp);
event->type = SCHED_EVENT_WAKEUP;
@@ -303,7 +303,7 @@ static void
add_sched_event_sleep(struct task_desc *task, u64 timestamp,
u64 task_state __used)
{
- struct sched_event *event = get_new_event(task, timestamp);
+ struct sched_atom *event = get_new_event(task, timestamp);

event->type = SCHED_EVENT_SLEEP;

@@ -372,27 +372,27 @@ static void add_cross_task_wakeups(void)
}

static void
-process_sched_event(struct task_desc *this_task __used, struct sched_event *event)
+process_sched_event(struct task_desc *this_task __used, struct sched_atom *atom)
{
int ret = 0;
u64 now;
long long delta;

now = get_nsecs();
- delta = start_time + event->timestamp - now;
+ delta = start_time + atom->timestamp - now;

- switch (event->type) {
+ switch (atom->type) {
case SCHED_EVENT_RUN:
- burn_nsecs(event->duration);
+ burn_nsecs(atom->duration);
break;
case SCHED_EVENT_SLEEP:
- if (event->wait_sem)
- ret = sem_wait(event->wait_sem);
+ if (atom->wait_sem)
+ ret = sem_wait(atom->wait_sem);
BUG_ON(ret);
break;
case SCHED_EVENT_WAKEUP:
- if (event->wait_sem)
- ret = sem_post(event->wait_sem);
+ if (atom->wait_sem)
+ ret = sem_post(atom->wait_sem);
BUG_ON(ret);
break;
default:
@@ -467,7 +467,7 @@ again:

for (i = 0; i < this_task->nr_events; i++) {
this_task->curr_event = i;
- process_sched_event(this_task, this_task->events[i]);
+ process_sched_event(this_task, this_task->atoms[i]);
}

cpu_usage_1 = get_cpu_usage_nsec_self();
@@ -649,7 +649,7 @@ static void __cmd_replay(void)
if (multitarget_wakeups)
printf("multi-target wakeups: %ld\n", multitarget_wakeups);
if (nr_run_events_optimized)
- printf("run events optimized: %ld\n",
+ printf("run atoms optimized: %ld\n",
nr_run_events_optimized);

print_task_traces();
@@ -727,6 +727,20 @@ struct trace_switch_event {
u32 next_prio;
};

+struct trace_runtime_event {
+ u32 size;
+
+ u16 common_type;
+ u8 common_flags;
+ u8 common_preempt_count;
+ u32 common_pid;
+ u32 common_tgid;
+
+ char comm[16];
+ u32 pid;
+ u64 runtime;
+ u64 vruntime;
+};

struct trace_wakeup_event {
u32 size;
@@ -767,6 +781,12 @@ struct trace_sched_handler {
u64 timestamp,
struct thread *thread);

+ void (*runtime_event)(struct trace_runtime_event *,
+ struct event *,
+ int cpu,
+ u64 timestamp,
+ struct thread *thread);
+
void (*wakeup_event)(struct trace_wakeup_event *,
struct event *,
int cpu,
@@ -881,7 +901,7 @@ struct sort_dimension {
static LIST_HEAD(cmp_pid);

static int
-thread_lat_cmp(struct list_head *list, struct task_atoms *l, struct task_atoms *r)
+thread_lat_cmp(struct list_head *list, struct work_atoms *l, struct work_atoms *r)
{
struct sort_dimension *sort;
int ret = 0;
@@ -897,18 +917,18 @@ thread_lat_cmp(struct list_head *list, struct task_atoms *l, struct task_atoms *
return ret;
}

-static struct task_atoms *
+static struct work_atoms *
thread_atoms_search(struct rb_root *root, struct thread *thread,
struct list_head *sort_list)
{
struct rb_node *node = root->rb_node;
- struct task_atoms key = { .thread = thread };
+ struct work_atoms key = { .thread = thread };

while (node) {
- struct task_atoms *atoms;
+ struct work_atoms *atoms;
int cmp;

- atoms = container_of(node, struct task_atoms, node);
+ atoms = container_of(node, struct work_atoms, node);

cmp = thread_lat_cmp(sort_list, &key, atoms);
if (cmp > 0)
@@ -924,16 +944,16 @@ thread_atoms_search(struct rb_root *root, struct thread *thread,
}

static void
-__thread_latency_insert(struct rb_root *root, struct task_atoms *data,
+__thread_latency_insert(struct rb_root *root, struct work_atoms *data,
struct list_head *sort_list)
{
struct rb_node **new = &(root->rb_node), *parent = NULL;

while (*new) {
- struct task_atoms *this;
+ struct work_atoms *this;
int cmp;

- this = container_of(*new, struct task_atoms, node);
+ this = container_of(*new, struct work_atoms, node);
parent = *new;

cmp = thread_lat_cmp(sort_list, data, this);
@@ -950,14 +970,14 @@ __thread_latency_insert(struct rb_root *root, struct task_atoms *data,

static void thread_atoms_insert(struct thread *thread)
{
- struct task_atoms *atoms;
+ struct work_atoms *atoms;

atoms = calloc(sizeof(*atoms), 1);
if (!atoms)
die("No memory");

atoms->thread = thread;
- INIT_LIST_HEAD(&atoms->atom_list);
+ INIT_LIST_HEAD(&atoms->work_list);
__thread_latency_insert(&atom_root, atoms, &cmp_pid);
}

@@ -980,10 +1000,9 @@ static char sched_out_state(struct trace_switch_event *switch_event)
}

static void
-lat_sched_out(struct task_atoms *atoms,
- struct trace_switch_event *switch_event __used,
- u64 delta,
- u64 timestamp)
+add_sched_out_event(struct work_atoms *atoms,
+ char run_state,
+ u64 timestamp)
{
struct work_atom *atom;

@@ -993,25 +1012,37 @@ lat_sched_out(struct task_atoms *atoms,

atom->sched_out_time = timestamp;

- if (sched_out_state(switch_event) == 'R') {
+ if (run_state == 'R') {
atom->state = THREAD_WAIT_CPU;
atom->wake_up_time = atom->sched_out_time;
}

- atom->runtime = delta;
- list_add_tail(&atom->list, &atoms->atom_list);
+ list_add_tail(&atom->list, &atoms->work_list);
+}
+
+static void
+add_runtime_event(struct work_atoms *atoms, u64 delta, u64 timestamp __used)
+{
+ struct work_atom *atom;
+
+ BUG_ON(list_empty(&atoms->work_list));
+
+ atom = list_entry(atoms->work_list.prev, struct work_atom, list);
+
+ atom->runtime += delta;
+ atoms->total_runtime += delta;
}

static void
-lat_sched_in(struct task_atoms *atoms, u64 timestamp)
+add_sched_in_event(struct work_atoms *atoms, u64 timestamp)
{
struct work_atom *atom;
u64 delta;

- if (list_empty(&atoms->atom_list))
+ if (list_empty(&atoms->work_list))
return;

- atom = list_entry(atoms->atom_list.prev, struct work_atom, list);
+ atom = list_entry(atoms->work_list.prev, struct work_atom, list);

if (atom->state != THREAD_WAIT_CPU)
return;
@@ -1029,7 +1060,6 @@ lat_sched_in(struct task_atoms *atoms, u64 timestamp)
if (delta > atoms->max_lat)
atoms->max_lat = delta;
atoms->nb_atoms++;
- atoms->total_runtime += atom->runtime;
}

static void
@@ -1039,13 +1069,12 @@ latency_switch_event(struct trace_switch_event *switch_event,
u64 timestamp,
struct thread *thread __used)
{
- struct task_atoms *out_atoms, *in_atoms;
+ struct work_atoms *out_events, *in_events;
struct thread *sched_out, *sched_in;
u64 timestamp0;
s64 delta;

- if (cpu >= MAX_CPUS || cpu < 0)
- return;
+ BUG_ON(cpu >= MAX_CPUS || cpu < 0);

timestamp0 = cpu_last_switched[cpu];
cpu_last_switched[cpu] = timestamp;
@@ -1061,34 +1090,63 @@ latency_switch_event(struct trace_switch_event *switch_event,
sched_out = threads__findnew(switch_event->prev_pid, &threads, &last_match);
sched_in = threads__findnew(switch_event->next_pid, &threads, &last_match);

- in_atoms = thread_atoms_search(&atom_root, sched_in, &cmp_pid);
- if (!in_atoms) {
+ out_events = thread_atoms_search(&atom_root, sched_out, &cmp_pid);
+ if (!out_events) {
+ thread_atoms_insert(sched_out);
+ out_events = thread_atoms_search(&atom_root, sched_out, &cmp_pid);
+ if (!out_events)
+ die("out-event: Internal tree error");
+ }
+ add_sched_out_event(out_events, sched_out_state(switch_event), timestamp);
+
+ in_events = thread_atoms_search(&atom_root, sched_in, &cmp_pid);
+ if (!in_events) {
thread_atoms_insert(sched_in);
- in_atoms = thread_atoms_search(&atom_root, sched_in, &cmp_pid);
- if (!in_atoms)
- die("in-atom: Internal tree error");
+ in_events = thread_atoms_search(&atom_root, sched_in, &cmp_pid);
+ if (!in_events)
+ die("in-event: Internal tree error");
+ /*
+ * Take came in we have not heard about yet,
+ * add in an initial atom in runnable state:
+ */
+ add_sched_out_event(in_events, 'R', timestamp);
}
+ add_sched_in_event(in_events, timestamp);
+}

- out_atoms = thread_atoms_search(&atom_root, sched_out, &cmp_pid);
- if (!out_atoms) {
- thread_atoms_insert(sched_out);
- out_atoms = thread_atoms_search(&atom_root, sched_out, &cmp_pid);
- if (!out_atoms)
- die("out-atom: Internal tree error");
+static void
+latency_runtime_event(struct trace_runtime_event *runtime_event,
+ struct event *event __used,
+ int cpu,
+ u64 timestamp,
+ struct thread *this_thread __used)
+{
+ struct work_atoms *atoms;
+ struct thread *thread;
+
+ BUG_ON(cpu >= MAX_CPUS || cpu < 0);
+
+ thread = threads__findnew(runtime_event->pid, &threads, &last_match);
+ atoms = thread_atoms_search(&atom_root, thread, &cmp_pid);
+ if (!atoms) {
+ thread_atoms_insert(thread);
+ atoms = thread_atoms_search(&atom_root, thread, &cmp_pid);
+ if (!atoms)
+ die("in-event: Internal tree error");
+ add_sched_out_event(atoms, 'R', timestamp);
}

- lat_sched_in(in_atoms, timestamp);
- lat_sched_out(out_atoms, switch_event, delta, timestamp);
+ add_runtime_event(atoms, runtime_event->runtime, timestamp);
}

static void
latency_wakeup_event(struct trace_wakeup_event *wakeup_event,
- struct event *event __used,
+ struct event *__event __used,
int cpu __used,
u64 timestamp,
struct thread *thread __used)
{
- struct task_atoms *atoms;
+ struct work_atoms *atoms;
struct work_atom *atom;
struct thread *wakee;

@@ -1100,16 +1158,20 @@ latency_wakeup_event(struct trace_wakeup_event *wakeup_event,
atoms = thread_atoms_search(&atom_root, wakee, &cmp_pid);
if (!atoms) {
thread_atoms_insert(wakee);
- return;
+ atoms = thread_atoms_search(&atom_root, wakee, &cmp_pid);
+ if (!atoms)
+ die("wakeup-event: Internal tree error");
+ add_sched_out_event(atoms, 'S', timestamp);
}

- if (list_empty(&atoms->atom_list))
- return;
+ BUG_ON(list_empty(&atoms->work_list));

- atom = list_entry(atoms->atom_list.prev, struct work_atom, list);
+ atom = list_entry(atoms->work_list.prev, struct work_atom, list);

- if (atom->state != THREAD_SLEEPING)
+ if (atom->state != THREAD_SLEEPING) {
+ printf("boo2\n");
return;
+ }

nr_timestamps++;
if (atom->sched_out_time > timestamp) {
@@ -1124,40 +1186,41 @@ latency_wakeup_event(struct trace_wakeup_event *wakeup_event,
static struct trace_sched_handler lat_ops = {
.wakeup_event = latency_wakeup_event,
.switch_event = latency_switch_event,
+ .runtime_event = latency_runtime_event,
.fork_event = latency_fork_event,
};

-static void output_lat_thread(struct task_atoms *atom_list)
+static void output_lat_thread(struct work_atoms *work_list)
{
int i;
int ret;
u64 avg;

- if (!atom_list->nb_atoms)
+ if (!work_list->nb_atoms)
return;
/*
* Ignore idle threads:
*/
- if (!atom_list->thread->pid)
+ if (!work_list->thread->pid)
return;

- all_runtime += atom_list->total_runtime;
- all_count += atom_list->nb_atoms;
+ all_runtime += work_list->total_runtime;
+ all_count += work_list->nb_atoms;

- ret = printf(" %s-%d ", atom_list->thread->comm, atom_list->thread->pid);
+ ret = printf(" %s-%d ", work_list->thread->comm, work_list->thread->pid);

for (i = 0; i < 24 - ret; i++)
printf(" ");

- avg = atom_list->total_lat / atom_list->nb_atoms;
+ avg = work_list->total_lat / work_list->nb_atoms;

printf("|%9.3f ms |%9llu | avg:%9.3f ms | max:%9.3f ms |\n",
- (double)atom_list->total_runtime / 1e6,
- atom_list->nb_atoms, (double)avg / 1e6,
- (double)atom_list->max_lat / 1e6);
+ (double)work_list->total_runtime / 1e6,
+ work_list->nb_atoms, (double)avg / 1e6,
+ (double)work_list->max_lat / 1e6);
}

-static int pid_cmp(struct task_atoms *l, struct task_atoms *r)
+static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
{
if (l->thread->pid < r->thread->pid)
return -1;
@@ -1172,7 +1235,7 @@ static struct sort_dimension pid_sort_dimension = {
.cmp = pid_cmp,
};

-static int avg_cmp(struct task_atoms *l, struct task_atoms *r)
+static int avg_cmp(struct work_atoms *l, struct work_atoms *r)
{
u64 avgl, avgr;

@@ -1198,7 +1261,7 @@ static struct sort_dimension avg_sort_dimension = {
.cmp = avg_cmp,
};

-static int max_cmp(struct task_atoms *l, struct task_atoms *r)
+static int max_cmp(struct work_atoms *l, struct work_atoms *r)
{
if (l->max_lat < r->max_lat)
return -1;
@@ -1213,7 +1276,7 @@ static struct sort_dimension max_sort_dimension = {
.cmp = max_cmp,
};

-static int switch_cmp(struct task_atoms *l, struct task_atoms *r)
+static int switch_cmp(struct work_atoms *l, struct work_atoms *r)
{
if (l->nb_atoms < r->nb_atoms)
return -1;
@@ -1228,7 +1291,7 @@ static struct sort_dimension switch_sort_dimension = {
.cmp = switch_cmp,
};

-static int runtime_cmp(struct task_atoms *l, struct task_atoms *r)
+static int runtime_cmp(struct work_atoms *l, struct work_atoms *r)
{
if (l->total_runtime < r->total_runtime)
return -1;
@@ -1277,13 +1340,13 @@ static void sort_lat(void)
struct rb_node *node;

for (;;) {
- struct task_atoms *data;
+ struct work_atoms *data;
node = rb_first(&atom_root);
if (!node)
break;

rb_erase(node, &atom_root);
- data = rb_entry(node, struct task_atoms, node);
+ data = rb_entry(node, struct work_atoms, node);
__thread_latency_insert(&sorted_atom_root, data, &sort_list);
}
}
@@ -1303,10 +1366,10 @@ static void __cmd_lat(void)
next = rb_first(&sorted_atom_root);

while (next) {
- struct task_atoms *atom_list;
+ struct work_atoms *work_list;

- atom_list = rb_entry(next, struct task_atoms, node);
- output_lat_thread(atom_list);
+ work_list = rb_entry(next, struct work_atoms, node);
+ output_lat_thread(work_list);
next = rb_next(next);
}

@@ -1369,6 +1432,23 @@ process_sched_switch_event(struct raw_event_sample *raw,
}

static void
+process_sched_runtime_event(struct raw_event_sample *raw,
+ struct event *event,
+ int cpu __used,
+ u64 timestamp __used,
+ struct thread *thread __used)
+{
+ struct trace_runtime_event runtime_event;
+
+ FILL_ARRAY(runtime_event, comm, event, raw->data);
+ FILL_FIELD(runtime_event, pid, event, raw->data);
+ FILL_FIELD(runtime_event, runtime, event, raw->data);
+ FILL_FIELD(runtime_event, vruntime, event, raw->data);
+
+ trace_handler->runtime_event(&runtime_event, event, cpu, timestamp, thread);
+}
+
+static void
process_sched_fork_event(struct raw_event_sample *raw,
struct event *event,
int cpu __used,
@@ -1410,6 +1490,8 @@ process_raw_event(event_t *raw_event __used, void *more_data,

if (!strcmp(event->name, "sched_switch"))
process_sched_switch_event(raw, event, cpu, timestamp, thread);
+ if (!strcmp(event->name, "sched_stat_runtime"))
+ process_sched_runtime_event(raw, event, cpu, timestamp, thread);
if (!strcmp(event->name, "sched_wakeup"))
process_sched_wakeup_event(raw, event, cpu, timestamp, thread);
if (!strcmp(event->name, "sched_wakeup_new"))