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| author | Oleg Nesterov <oleg@redhat.com> | 2013-10-19 18:18:28 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-10-31 11:16:18 +0100 |
| commit | 6a716c90a51338009c3bc1f460829afaed8f922d (patch) | |
| tree | 85e821a30e0f9350a2b67ff94d758632eec92689 /kernel | |
| parent | 4c4e4f61368164f326fe59e2156c70d7faa72c17 (diff) | |
| download | op-kernel-dev-6a716c90a51338009c3bc1f460829afaed8f922d.zip op-kernel-dev-6a716c90a51338009c3bc1f460829afaed8f922d.tar.gz | |
hung_task debugging: Add tracepoint to report the hang
Currently check_hung_task() prints a warning if it detects the
problem, but it is not convenient to watch the system logs if
user-space wants to be notified about the hang.
Add the new trace_sched_process_hang() into check_hung_task(),
this way a user-space monitor can easily wait for the hang and
potentially resolve a problem.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Dave Sullivan <dsulliva@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20131019161828.GA7439@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/hung_task.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/hung_task.c b/kernel/hung_task.c index 0422523..8807061 100644 --- a/kernel/hung_task.c +++ b/kernel/hung_task.c @@ -16,6 +16,7 @@ #include <linux/export.h> #include <linux/sysctl.h> #include <linux/utsname.h> +#include <trace/events/sched.h> /* * The number of tasks checked: @@ -92,6 +93,9 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout) t->last_switch_count = switch_count; return; } + + trace_sched_process_hang(t); + if (!sysctl_hung_task_warnings) return; sysctl_hung_task_warnings--; |
