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rcutorture: Dump grace-period diagnostics upon forward-progress OOM

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This commit adds an OOM notifier during rcutorture forward-progress
testing.  If this notifier is invoked, it dumps out some grace-period
state to help debug the forward-progress problem.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney
2018-10-01 17:40:54 -07:00
parent 61670adcb4
commit e0aff97355
3 changed files with 50 additions and 3 deletions
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20
kernel/rcu/tree.c
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@@ -2657,6 +2657,26 @@ rcu_check_gp_start_stall(struct rcu_node *rnp, struct rcu_data *rdp,
raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
}
/*
* Do a forward-progress check for rcutorture. This is normally invoked
* due to an OOM event. The argument "j" gives the time period during
* which rcutorture would like progress to have been made.
*/
void rcu_fwd_progress_check(unsigned long j)
{
struct rcu_data *rdp;
if (rcu_gp_in_progress()) {
show_rcu_gp_kthreads();
} else {
preempt_disable();
rdp = this_cpu_ptr(&rcu_data);
rcu_check_gp_start_stall(rdp->mynode, rdp, j);
preempt_enable();
}
}
EXPORT_SYMBOL_GPL(rcu_fwd_progress_check);
/*
* This does the RCU core processing work for the specified rcu_data
* structures. This may be called only from the CPU to whom the rdp