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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have outdated ideas of the current grace-period number.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>
This commit is contained in:
Paul E. McKenney 2021-04-07 15:14:01 -07:00
parent 3ef5a1c382
commit b15805013b
1 changed files with 3 additions and 2 deletions
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5
kernel/rcu/tree_stall.h
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@ -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,