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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-08-18 10:20:43 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-10-07 16:02:50 -0700
commit74611ecb0fc4c850a8f89a744ce99cbf0dd43cb2 (patch)
treec9b1b3d088f3fbe755656086fe104116a9b395dc /kernel/rcu/tree.c
parentdcdb8807ba0f5127d4dc67daeeb154edf50a93d1 (diff)
downloadlinux-sh-74611ecb0fc4c850a8f89a744ce99cbf0dd43cb2.tar.gz
rcu: Add online/offline info to expedited stall warning message
This commit makes the RCU CPU stall warning message print online/offline indications immediately after the CPU number. A "O" indicates global offline, a "." global online, and a "o" indicates RCU believes that the CPU is offline for the current grace period and "." otherwise, and an "N" indicates that RCU believes that the CPU will be offline for the next grace period, and "." otherwise, all right after the CPU number. So for CPU 10, you would normally see "10-...:" indicating that everything believes that the CPU is online. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu/tree.c')
-rw-r--r--kernel/rcu/tree.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index f44f4b30c68a..3d033fee0dcb 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3737,11 +3737,18 @@ static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
pr_err("INFO: %s detected expedited stalls on CPUs: {",
rsp->name);
rcu_for_each_leaf_node(rsp, rnp) {
+ (void)rcu_print_task_exp_stall(rnp);
mask = 1;
for (cpu = rnp->grplo; cpu <= rnp->grphi; cpu++, mask <<= 1) {
+ struct rcu_data *rdp;
+
if (!(rnp->expmask & mask))
continue;
- pr_cont(" %d", cpu);
+ rdp = per_cpu_ptr(rsp->rda, cpu);
+ pr_cont(" %d-%c%c%c", cpu,
+ "O."[cpu_online(cpu)],
+ "o."[!!(rdp->grpmask & rnp->expmaskinit)],
+ "N."[!!(rdp->grpmask & rnp->expmaskinitnext)]);
}
mask <<= 1;
}