[lkml]   [2022]   [Jan]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH v3 2/2] sched/tracing: Report TASK_RTLOCK_WAIT tasks as TASK_UNINTERRUPTIBLE
TASK_RTLOCK_WAIT currently isn't part of TASK_REPORT, thus a task blocking
on an rtlock will appear as having a task state == 0, IOW TASK_RUNNING.

The actual state is saved in p->saved_state, but reading it after reading
p->__state has a few issues:
o that could still be TASK_RUNNING in the case of e.g. rt_spin_lock
o ttwu_state_match() might have changed that to TASK_RUNNING

As pointed out by Eric, adding TASK_RTLOCK_WAIT to TASK_REPORT implies
exposing a new state to userspace tools which way not know what to do with
them. The only information that needs to be conveyed here is that a task is
waiting on an rt_mutex, which matches TASK_UNINTERRUPTIBLE - there's no
need for a new state.

Reported-by: Uwe Kleine-König <>
Signed-off-by: Valentin Schneider <>
include/linux/sched.h | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index d00837d12b9d..068270ff04b8 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1626,6 +1626,14 @@ static inline unsigned int __task_state_index(unsigned int tsk_state,
if (tsk_state == TASK_IDLE)

+ /*
+ * We're lying here, but rather than expose a completely new task state
+ * to userspace, we can make this appear as if the task has gone through
+ * a regular rt_mutex_lock() call.
+ */
+ if (tsk_state == TASK_RTLOCK_WAIT)
return fls(state);

 \ /
  Last update: 2022-01-20 17:26    [W:0.132 / U:1.340 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site