Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit f977bb49 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

perf_counter, sched: Add sched_stat_runtime tracepoint 



This allows more precise tracking of how the scheduler accounts
(and acts upon) a task having spent N nanoseconds of CPU time.

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: default avatarIngo Molnar <mingo@elte.hu>
parent c13f0d3c

include/trace/events/sched.h

+33 −0
Original line number Diff line number Diff line
@@ -379,6 +379,39 @@ TRACE_EVENT(sched_stat_wait, 
			(unsigned long long)__entry->delay)

);



/*

 * Tracepoint for accounting runtime (time the task is executing

 * on a CPU).

 */

TRACE_EVENT(sched_stat_runtime,



	TP_PROTO(struct task_struct *tsk, u64 runtime, u64 vruntime),



	TP_ARGS(tsk, runtime, vruntime),



	TP_STRUCT__entry(

		__array( char,	comm,	TASK_COMM_LEN	)

		__field( pid_t,	pid			)

		__field( u64,	runtime			)

		__field( u64,	vruntime			)

	),



	TP_fast_assign(

		memcpy(__entry->comm, tsk->comm, TASK_COMM_LEN);

		__entry->pid		= tsk->pid;

		__entry->runtime	= runtime;

		__entry->vruntime	= vruntime;

	)

	TP_perf_assign(

		__perf_count(runtime);

	),



	TP_printk("task: %s:%d runtime: %Lu [ns], vruntime: %Lu [ns]",

			__entry->comm, __entry->pid,

			(unsigned long long)__entry->runtime,

			(unsigned long long)__entry->vruntime)

);



/*

 * Tracepoint for accounting sleep time (time the task is not runnable,

 * including iowait, see below).

kernel/sched_fair.c

+1 −0
Original line number Diff line number Diff line
@@ -513,6 +513,7 @@ static void update_curr(struct cfs_rq *cfs_rq) 
	if (entity_is_task(curr)) {

		struct task_struct *curtask = task_of(curr);



		trace_sched_stat_runtime(curtask, delta_exec, curr->vruntime);

		cpuacct_charge(curtask, delta_exec);

		account_group_exec_runtime(curtask, delta_exec);

	}