linux-kernel - [PATCH tip/core/rcu 26/45] torture: Dump ftrace buffer when the RCU grace period stalls

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Message-Id: <1398731133-18925-26-git-send-email-paulmck@linux.vnet.ibm.com>
Date:	Mon, 28 Apr 2014 17:25:14 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com,
	edumazet@...gle.com, darren@...art.com, fweisbec@...il.com,
	oleg@...hat.com, sbw@....edu,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 26/45] torture: Dump ftrace buffer when the RCU grace period stalls

From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>

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@...ux.vnet.ibm.com>
---
 kernel/rcu/rcutorture.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 0141fcff6bb9..50c26a7b6d97 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1033,6 +1033,7 @@ 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;
 }
-- 
1.8.1.5

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