tracepoint: trace_sched_migrate_task(): remove parameter

The orig_cpu parameter in trace_sched_migrate_task() is not necessary,
it can be got by using task_cpu(p) in the probe.

[ Impact: micro-optimization ]

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
[ modified from Mathieu's patch. The original patch is at:
  http://marc.info/?l=linux-kernel&m=123791201716239&w=2 ]
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: zhaolei@cn.fujitsu.com
Cc: laijs@cn.fujitsu.com
LKML-Reference: <49FFFDB7.1050402@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index ffa1cab..dd4033c 100644 (file)
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -180,9 +180,9 @@ TRACE_EVENT(sched_switch,
  */
 TRACE_EVENT(sched_migrate_task,
 
-       TP_PROTO(struct task_struct *p, int orig_cpu, int dest_cpu),
+       TP_PROTO(struct task_struct *p, int dest_cpu),
 
-       TP_ARGS(p, orig_cpu, dest_cpu),
+       TP_ARGS(p, dest_cpu),
 
        TP_STRUCT__entry(
                __array(        char,   comm,   TASK_COMM_LEN   )
@@ -196,7 +196,7 @@ TRACE_EVENT(sched_migrate_task,
                memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
                __entry->pid            = p->pid;
                __entry->prio           = p->prio;
-               __entry->orig_cpu       = orig_cpu;
+               __entry->orig_cpu       = task_cpu(p);
                __entry->dest_cpu       = dest_cpu;
        ),
 

diff --git a/kernel/sched.c b/kernel/sched.c
index 9f7ffd0..9cdedbd 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1954,7 +1954,7 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
 
        clock_offset = old_rq->clock - new_rq->clock;
 
-       trace_sched_migrate_task(p, task_cpu(p), new_cpu);
+       trace_sched_migrate_task(p, new_cpu);
 
 #ifdef CONFIG_SCHEDSTATS
        if (p->se.wait_start)