diff options
| author | Riley Andrews <riandrews@google.com> | 2015-10-02 00:39:53 -0700 |
|---|---|---|
| committer | Dmitry Shmidt <dimitrysh@google.com> | 2015-12-22 11:53:42 -0800 |
| commit | f734d2ce1bcdc2b8105a45e89c546b4a72c09b11 (patch) | |
| tree | 65c7c5929c967331ed39c96cf7ad5136675860b2 /include | |
| parent | 2195139276bb72516293bb8038d997fba90a497e (diff) | |
sched: add sched blocked tracepoint which dumps out context of sleep.
Decare war on uninterruptible sleep. Add a tracepoint which
walks the kernel stack and dumps the first non-scheduler function
called before the scheduler is invoked.
Change-Id: I19e965d5206329360a92cbfe2afcc8c30f65c229
Signed-off-by: Riley Andrews <riandrews@google.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/trace/events/sched.h | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h index f65802c24b69..5abe3e4a2c7e 100644 --- a/include/trace/events/sched.h +++ b/include/trace/events/sched.h @@ -235,7 +235,7 @@ DECLARE_EVENT_CLASS(sched_process_template, DEFINE_EVENT(sched_process_template, sched_process_free, TP_PROTO(struct task_struct *p), TP_ARGS(p)); - + /* * Tracepoint for a task exiting: @@ -390,6 +390,30 @@ DEFINE_EVENT(sched_stat_template, sched_stat_blocked, TP_ARGS(tsk, delay)); /* + * Tracepoint for recording the cause of uninterruptible sleep. + */ +TRACE_EVENT(sched_blocked_reason, + + TP_PROTO(struct task_struct *tsk), + + TP_ARGS(tsk), + + TP_STRUCT__entry( + __field( pid_t, pid ) + __field( void*, caller ) + __field( bool, io_wait ) + ), + + TP_fast_assign( + __entry->pid = tsk->pid; + __entry->caller = (void*)get_wchan(tsk); + __entry->io_wait = tsk->in_iowait; + ), + + TP_printk("pid=%d iowait=%d caller=%pS", __entry->pid, __entry->io_wait, __entry->caller) +); + +/* * Tracepoint for accounting runtime (time the task is executing * on a CPU). */ |