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| author | Paul E. McKenney <paulmck@linux.ibm.com> | 2018-10-02 03:40:54 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.ibm.com> | 2018-12-01 23:45:36 +0300 |
| commit | e0aff97355575ac6a28a48a4217533a3953095c5 (patch) | |
| tree | 4826db9f3fc2c1452fa4dd7ce0f803dc69929d1c /kernel/rcu/tree.c | |
| parent | 61670adcb4a9f66ff3fa8a9e846a623d9a9e1553 (diff) | |
| download | linux-e0aff97355575ac6a28a48a4217533a3953095c5.tar.xz | |
rcutorture: Dump grace-period diagnostics upon forward-progress OOM
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>
Diffstat (limited to 'kernel/rcu/tree.c')
| -rw-r--r-- | kernel/rcu/tree.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 6ec3abbe90e2..853b79a6ff10 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -2658,6 +2658,26 @@ rcu_check_gp_start_stall(struct rcu_node *rnp, struct rcu_data *rdp, } /* + * 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 * belongs. |