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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2018-05-24 16:26:48 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-11 17:29:24 +0300 |
| commit | 7cf346dfdea552f5ca71b85cf7389d347269b40c (patch) | |
| tree | 3d7ce8b5ee3f02472de184fc2aa84dba7b193a3b /include/trace/events | |
| parent | 32199c810655f5251e388abdd63e2313c71ad4d8 (diff) | |
| download | linux-7cf346dfdea552f5ca71b85cf7389d347269b40c.tar.xz | |
sched, tracing: Fix trace_sched_pi_setprio() for deboosting
commit 4ff648decf4712d39f184fc2df3163f43975575a upstream.
Since the following commit:
b91473ff6e97 ("sched,tracing: Update trace_sched_pi_setprio()")
the sched_pi_setprio trace point shows the "newprio" during a deboost:
|futex sched_pi_setprio: comm=futex_requeue_p pid"34 oldprio newprio=3D98
|futex sched_switch: prev_comm=futex_requeue_p prev_pid"34 prev_prio=120
This patch open codes __rt_effective_prio() in the tracepoint as the
'newprio' to get the old behaviour back / the correct priority:
|futex sched_pi_setprio: comm=futex_requeue_p pid"20 oldprio newprio=3D120
|futex sched_switch: prev_comm=futex_requeue_p prev_pid"20 prev_prio=120
Peter suggested to open code the new priority so people using tracehook
could get the deadline data out.
Reported-by: Mansky Christian <man@keba.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: b91473ff6e97 ("sched,tracing: Update trace_sched_pi_setprio()")
Link: http://lkml.kernel.org/r/20180524132647.gg6ziuogczdmjjzu@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/trace/events')
| -rw-r--r-- | include/trace/events/sched.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h index da10aa21bebc..d447f24df970 100644 --- a/include/trace/events/sched.h +++ b/include/trace/events/sched.h @@ -435,7 +435,9 @@ TRACE_EVENT(sched_pi_setprio, memcpy(__entry->comm, tsk->comm, TASK_COMM_LEN); __entry->pid = tsk->pid; __entry->oldprio = tsk->prio; - __entry->newprio = pi_task ? pi_task->prio : tsk->prio; + __entry->newprio = pi_task ? + min(tsk->normal_prio, pi_task->prio) : + tsk->normal_prio; /* XXX SCHED_DEADLINE bits missing */ ), |