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Commit c6ced611 authored by Frederic Weisbecker's avatar Frederic Weisbecker Committed by Ingo Molnar
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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: default avatarFrederic 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: default avatarIngo Molnar <mingo@elte.hu>
parent 17562205

tools/perf/builtin-sched.c

+13 −6
Original line number Diff line number Diff line
@@ -866,8 +866,8 @@ static struct trace_sched_handler replay_ops = { 
#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 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)

	      struct trace_switch_event *switch_event __used,

	      u64 delta,

	      u64 timestamp)

{

	struct work_atom *snapshot;
@@ -970,6 +972,11 @@ lat_sched_out(struct task_atoms *atoms, 
	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 @@ lat_sched_in(struct task_atoms *atoms, u64 timestamp) 
	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 @@ latency_switch_event(struct trace_switch_event *switch_event, 
	}



	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 @@ latency_wakeup_event(struct trace_wakeup_event *wakeup_event, 
	if (snapshot->state != THREAD_SLEEPING)

		return;



	snapshot->state = THREAD_WAKED_UP;

	snapshot->state = THREAD_WAIT_CPU;

	snapshot->wake_up_time = timestamp;

}