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perf sched timehist: Account thread wait time separately 

Separate thread wait time into 3 parts - sleep, iowait and preempt based
on the prev_state of the last event.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170113104523.31212-1-namhyung@kernel.org
[ Fix the build on centos:5 where 'wait' shadows a global declaration ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2017-01-13 19:45:21 +09:00 committed by Arnaldo Carvalho de Melo
parent be3d466c73
commit 941bdea79e
1 changed files with 44 additions and 6 deletions
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50
tools/perf/builtin-sched.c
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@ -77,6 +77,22 @@ struct sched_atom {
#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP"
/* task state bitmask, copied from include/linux/sched.h */
#define TASK_RUNNING 0
#define TASK_INTERRUPTIBLE 1
#define TASK_UNINTERRUPTIBLE 2
#define __TASK_STOPPED 4
#define __TASK_TRACED 8
/* in tsk->exit_state */
#define EXIT_DEAD 16
#define EXIT_ZOMBIE 32
#define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD)
/* in tsk->state again */
#define TASK_DEAD 64
#define TASK_WAKEKILL 128
#define TASK_WAKING 256
#define TASK_PARKED 512
enum thread_state {
THREAD_SLEEPING = 0,
THREAD_WAIT_CPU,
@ -216,13 +232,16 @@ struct perf_sched {
struct thread_runtime {
u64 last_time; /* time of previous sched in/out event */
u64 dt_run; /* run time */
u64 dt_wait; /* time between CPU access (off cpu) */
u64 dt_sleep; /* time between CPU access by sleep (off cpu) */
u64 dt_iowait; /* time between CPU access by iowait (off cpu) */
u64 dt_preempt; /* time between CPU access by preempt (off cpu) */
u64 dt_delay; /* time between wakeup and sched-in */
u64 ready_to_run; /* time of wakeup */
struct stats run_stats;
u64 total_run_time;
int last_state;
u64 migrations;
};
@ -1858,6 +1877,7 @@ static void timehist_print_sample(struct perf_sched *sched,
struct thread_runtime *tr = thread__priv(thread);
u32 max_cpus = sched->max_cpu + 1;
char tstr[64];
u64 wait_time;
timestamp__scnprintf_usec(t, tstr, sizeof(tstr));
printf("%15s [%04d] ", tstr, sample->cpu);
@ -1880,7 +1900,9 @@ static void timehist_print_sample(struct perf_sched *sched,
printf(" %-*s ", comm_width, timehist_get_commstr(thread));
print_sched_time(tr->dt_wait, 6);
wait_time = tr->dt_sleep + tr->dt_iowait + tr->dt_preempt;
print_sched_time(wait_time, 6);
print_sched_time(tr->dt_delay, 6);
print_sched_time(tr->dt_run, 6);
@ -1930,8 +1952,11 @@ static void timehist_update_runtime_stats(struct thread_runtime *r,
u64 t, u64 tprev)
{
r->dt_delay = 0;
r->dt_wait = 0;
r->dt_sleep = 0;
r->dt_iowait = 0;
r->dt_preempt = 0;
r->dt_run = 0;
if (tprev) {
r->dt_run = t - tprev;
if (r->ready_to_run) {
@ -1943,8 +1968,16 @@ static void timehist_update_runtime_stats(struct thread_runtime *r,
if (r->last_time > tprev)
pr_debug("time travel: last sched out time for task > previous sched_switch event\n");
else if (r->last_time)
r->dt_wait = tprev - r->last_time;
else if (r->last_time) {
u64 dt_wait = tprev - r->last_time;
if (r->last_state == TASK_RUNNING)
r->dt_preempt = dt_wait;
else if (r->last_state == TASK_UNINTERRUPTIBLE)
r->dt_iowait = dt_wait;
else
r->dt_sleep = dt_wait;
}
}
update_stats(&r->run_stats, r->dt_run);
@ -2447,8 +2480,10 @@ static int timehist_sched_change_event(struct perf_tool *tool,
* time. we only care total run time and run stat.
*/
last_tr->dt_run = 0;
last_tr->dt_wait = 0;
last_tr->dt_delay = 0;
last_tr->dt_sleep = 0;
last_tr->dt_iowait = 0;
last_tr->dt_preempt = 0;
if (itr->cursor.nr)
callchain_append(&itr->callchain, &itr->cursor, t - tprev);
@ -2470,6 +2505,9 @@ out:
/* time of this sched_switch event becomes last time task seen */
tr->last_time = sample->time;
/* last state is used to determine where to account wait time */
tr->last_state = perf_evsel__intval(evsel, sample, "prev_state");
/* sched out event for task so reset ready to run time */
tr->ready_to_run = 0;
}