rcu: Add grace-period information to RCU CPU stall warnings
This commit causes the last grace period started and completed to be
printed on RCU CPU stall warning messages in order to aid diagnosis.
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index e785387..8f4de3a 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -947,8 +947,9 @@
raw_spin_unlock_irqrestore(&rnp->lock, flags);
print_cpu_stall_info_end();
- printk(KERN_CONT "(detected by %d, t=%ld jiffies)\n",
- smp_processor_id(), (long)(jiffies - rsp->gp_start));
+ pr_cont("(detected by %d, t=%ld jiffies, g=%lu, c=%lu)\n",
+ smp_processor_id(), (long)(jiffies - rsp->gp_start),
+ rsp->gpnum, rsp->completed);
if (ndetected == 0)
printk(KERN_ERR "INFO: Stall ended before state dump start\n");
else if (!trigger_all_cpu_backtrace())
@@ -975,7 +976,8 @@
print_cpu_stall_info_begin();
print_cpu_stall_info(rsp, smp_processor_id());
print_cpu_stall_info_end();
- printk(KERN_CONT " (t=%lu jiffies)\n", jiffies - rsp->gp_start);
+ pr_cont(" (t=%lu jiffies g=%lu c=%lu)\n",
+ jiffies - rsp->gp_start, rsp->gpnum, rsp->completed);
if (!trigger_all_cpu_backtrace())
dump_stack();