[PATCH] SysRq-X: show blocked tasks
Add SysRq-X support: show blocked (TASK_UNINTERRUPTIBLE) tasks only.
Useful for debugging IO stalls.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/kernel/sched.c b/kernel/sched.c
index 12fdbef..1848e28 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4804,7 +4804,7 @@
show_stack(p, NULL);
}
-void show_state(void)
+void show_state_filter(unsigned long state_filter)
{
struct task_struct *g, *p;
@@ -4824,11 +4824,16 @@
* console might take alot of time:
*/
touch_nmi_watchdog();
- show_task(p);
+ if (p->state & state_filter)
+ show_task(p);
} while_each_thread(g, p);
read_unlock(&tasklist_lock);
- debug_show_all_locks();
+ /*
+ * Only show locks if all tasks are dumped:
+ */
+ if (state_filter == -1)
+ debug_show_all_locks();
}
/**
