perf sched: Add involuntarily sleeping task in work atoms
Currently in perf sched, we are measuring the scheduler wakeup
latencies.
Now we also want measure the time a task wait to be scheduled
after it gets preempted.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
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>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 7e57a98..61a80e8 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -866,8 +866,8 @@
#define TASK_STATE_TO_CHAR_STR "RSDTtZX"
enum thread_state {
- THREAD_SLEEPING,
- THREAD_WAKED_UP,
+ THREAD_SLEEPING = 0,
+ THREAD_WAIT_CPU,
THREAD_SCHED_IN,
THREAD_IGNORE
};
@@ -962,7 +962,9 @@
static void
lat_sched_out(struct task_atoms *atoms,
- struct trace_switch_event *switch_event __used, u64 delta)
+ struct trace_switch_event *switch_event __used,
+ u64 delta,
+ u64 timestamp)
{
struct work_atom *snapshot;
@@ -970,6 +972,11 @@
if (!snapshot)
die("Non memory");
+ if (sched_out_state(switch_event) == 'R') {
+ snapshot->state = THREAD_WAIT_CPU;
+ snapshot->wake_up_time = timestamp;
+ }
+
snapshot->runtime = delta;
list_add_tail(&snapshot->list, &atoms->snapshot_list);
}
@@ -985,7 +992,7 @@
snapshot = list_entry(atoms->snapshot_list.prev, struct work_atom,
list);
- if (snapshot->state != THREAD_WAKED_UP)
+ if (snapshot->state != THREAD_WAIT_CPU)
return;
if (timestamp < snapshot->wake_up_time) {
@@ -1043,7 +1050,7 @@
}
lat_sched_in(in_atoms, timestamp);
- lat_sched_out(out_atoms, switch_event, delta);
+ lat_sched_out(out_atoms, switch_event, delta, timestamp);
}
static void
@@ -1077,7 +1084,7 @@
if (snapshot->state != THREAD_SLEEPING)
return;
- snapshot->state = THREAD_WAKED_UP;
+ snapshot->state = THREAD_WAIT_CPU;
snapshot->wake_up_time = timestamp;
}