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| author |   Paul E. McKenney <paulmck@kernel.org> | 2021-04-07 15:14:01 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-05-10 16:22:54 -0700 |
| commit | b15805013b441b13fcf6e402c03421c03edb79c6 (patch) | |
| tree | 2da032bfaa65140dd27a5afdbd935f3cbd966ea0 /kernel/rcu/tree_stall.h | |
| parent | rcu: Make RCU priority boosting work on single-CPU rcu_node structures (diff) | |
| download | wireguard-linux-b15805013b441b13fcf6e402c03421c03edb79c6.tar.xz wireguard-linux-b15805013b441b13fcf6e402c03421c03edb79c6.zip | |
rcu: Make show_rcu_gp_kthreads() dump rcu_node structures blocking GP
Currently, show_rcu_gp_kthreads() only dumps rcu_node structures that
have outdated ideas of the current grace-period number. This commit
also dumps those that are in any way blocking the current grace period.
This helps diagnose RCU priority boosting failures.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/tree_stall.h')
| -rw-r--r-- | kernel/rcu/tree_stall.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h index c1f83864a18e..e6bd518e0bc4 100644 --- a/kernel/rcu/tree_stall.h +++ b/kernel/rcu/tree_stall.h @@ -746,8 +746,9 @@ void show_rcu_gp_kthreads(void) data_race(rcu_state.gp_max), data_race(rcu_state.gp_flags)); rcu_for_each_node_breadth_first(rnp) { - if (ULONG_CMP_GE(READ_ONCE(rcu_state.gp_seq), - READ_ONCE(rnp->gp_seq_needed))) + if (ULONG_CMP_GE(READ_ONCE(rcu_state.gp_seq), READ_ONCE(rnp->gp_seq_needed)) && + !data_race(rnp->qsmask) && !data_race(rnp->boost_tasks) && + !data_race(rnp->exp_tasks) && !data_race(rnp->gp_tasks)) continue; pr_info("\trcu_node %d:%d ->gp_seq %ld ->gp_seq_needed %ld ->qsmask %#lx %c%c%c%c ->n_boosts %ld\n", rnp->grplo, rnp->grphi, |