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rcu: Add diagnostics for rcutorture writer stall warning 

This commit adds any in-the-future ->gp_seq_needed fields to the
diagnostics for an rcutorture writer stall warning message.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-05-28 10:33:08 -07:00
parent cd23ac8ddb
commit 47199a0812
1 changed files with 21 additions and 0 deletions
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21
kernel/rcu/tree.c
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@ -606,11 +606,32 @@ EXPORT_SYMBOL_GPL(rcu_sched_force_quiescent_state);
*/ */
void show_rcu_gp_kthreads(void) void show_rcu_gp_kthreads(void)
{ {
int cpu;
struct rcu_data *rdp;
struct rcu_node *rnp;
struct rcu_state *rsp; struct rcu_state *rsp;
for_each_rcu_flavor(rsp) { for_each_rcu_flavor(rsp) {
pr_info("%s: wait state: %d ->state: %#lx\n", pr_info("%s: wait state: %d ->state: %#lx\n",
rsp->name, rsp->gp_state, rsp->gp_kthread->state); rsp->name, rsp->gp_state, rsp->gp_kthread->state);
rcu_for_each_node_breadth_first(rsp, rnp) {
if (ULONG_CMP_GE(rsp->gp_seq, rnp->gp_seq_needed))
continue;
pr_info("\trcu_node %d:%d ->gp_seq %lu ->gp_seq_needed %lu\n",
rnp->grplo, rnp->grphi, rnp->gp_seq,
rnp->gp_seq_needed);
if (!rcu_is_leaf_node(rnp))
continue;
for_each_leaf_node_possible_cpu(rnp, cpu) {
rdp = per_cpu_ptr(rsp->rda, cpu);
if (rdp->gpwrap ||
ULONG_CMP_GE(rsp->gp_seq,
rdp->gp_seq_needed))
continue;
pr_info("\tcpu %d ->gp_seq_needed %lu\n",
cpu, rdp->gp_seq_needed);
}
}
/* sched_show_task(rsp->gp_kthread); */ /* sched_show_task(rsp->gp_kthread); */
} }
} }