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torture: Dump ftrace buffer when the RCU grace period stalls

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This commit adds a call to rcutorture_trace_dump() to dump the ftrace
buffer when the RCU grace period stalls in order to help debug the
stall.  Note that this is different than the RCU CPU stall warning,
as it is rcutorture detecting the stall rather than the underlying RCU
implementation.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney 2014-03-07 14:15:28 -08:00
parent 499c632dce
commit 945fa9c631
1 changed files with 1 additions and 0 deletions
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kernel/rcu/rcutorture.c
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@ -1034,6 +1034,7 @@ rcu_torture_printk(char *page)
"??? Writer stall state %d g%lu c%lu f%#x\n",
rcu_torture_writer_state,
gpnum, completed, flags);
rcutorture_trace_dump();
}
rtcv_snap = rcu_torture_current_version;
}