From f977bb4937857994312fff4f9c2cad336a36a932 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Sun, 13 Sep 2009 18:15:54 +0200 Subject: 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 Cc: Mike Galbraith Cc: Paul Mackerras Cc: Arnaldo Carvalho de Melo Cc: Frederic Weisbecker LKML-Reference: Signed-off-by: Ingo Molnar --- include/trace/events/sched.h | 33 +++++++++++++++++++++++++++++++++ kernel/sched_fair.c | 1 + 2 files changed, 34 insertions(+) diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h index b48f1ad7c946..4069c43f4187 100644 --- a/include/trace/events/sched.h +++ b/include/trace/events/sched.h @@ -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). diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index aa7f84121016..a097e909e80f 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -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); } -- cgit v1.2.2