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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-02-22 17:05:05 -0800
committerIngo Molnar <mingo@elte.hu>2010-02-25 10:35:02 +0100
commit1ed509a225008c9e8c0644fbd22168e09a7383a0 (patch)
treedb65a58258bb968e7bc922dab14f4f0714a7667e /kernel/rcutree.c
parent6155fec92e85f07d99e9746234496215443ffb0d (diff)
rcu: Add RCU_CPU_STALL_VERBOSE to dump detailed per-task information
When RCU detects a grace-period stall, it currently just prints out the PID of any tasks doing the stalling. This patch adds RCU_CPU_STALL_VERBOSE, which enables the more-verbose reporting from sched_show_task(). Suggested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <1266887105-1528-21-git-send-email-paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/rcutree.c')
-rw-r--r--kernel/rcutree.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index b07be37d2aa..525d3981061 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -489,6 +489,10 @@ static void print_other_cpu_stall(struct rcu_state *rsp)
smp_processor_id(), (long)(jiffies - rsp->gp_start));
trigger_all_cpu_backtrace();
+ /* If so configured, complain about tasks blocking the grace period. */
+
+ rcu_print_detail_task_stall(rsp);
+
force_quiescent_state(rsp, 0); /* Kick them all. */
}