Commit aa47b7e0 authored May 04, 2009 by David Rientjes Committed by Ingo Molnar May 07, 2009

sched: emit thread info flags with stack trace



When a thread is oom killed and fails to exit, it's helpful to know which
threads have access to memory reserves if the machine livelocks.  This is
done by testing for the TIF_MEMDIE thread info flag and should be
displayed alongside stack traces to identify tasks that have access to
such reserves but are still stuck allocating pages, for instance.

It would probably be helpful in other cases as well, so all thread info
flags are emitted when showing a task.

( v2: fix warning reported by Stephen Rothwell )

[ Impact: extend debug printout info ]

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
LKML-Reference: <alpine.DEB.2.00.0905040136390.15831@chino.kir.corp.google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 60aa605d

kernel/sched.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -6610,8 +6610,9 @@ void sched_show_task(struct task_struct *p)
		#ifdef CONFIG_DEBUG_STACK_USAGE
		free = stack_not_used(p);
		#endif
		printk(KERN_CONT "%5lu %5d %6d\n", free,
		task_pid_nr(p), task_pid_nr(p->real_parent));
		printk(KERN_CONT "%5lu %5d %6d 0x%08lx\n", free,
		task_pid_nr(p), task_pid_nr(p->real_parent),
		(unsigned long)task_thread_info(p)->flags);

		show_stack(p, NULL);
		}

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