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| author | Paul E. McKenney <paulmck@kernel.org> | 2021-04-07 01:31:42 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-05-11 01:22:54 +0200 |
| commit | 396eba65f62414ee8850ed5f7b5ce844719ebebf (patch) | |
| tree | c199bb3e1f0ab831caa89a11cd45638331849ba7 /kernel/rcu/tree_plugin.h | |
| parent | rcu: Reject RCU_LOCKDEP_WARN() false positives (diff) | |
| download | linux-396eba65f62414ee8850ed5f7b5ce844719ebebf.tar.xz linux-396eba65f62414ee8850ed5f7b5ce844719ebebf.zip | |
rcu: Add quiescent states and boost states to show_rcu_gp_kthreads() output
This commit adds each rcu_node structure's ->qsmask and "bBEG" output
indicating whether: (1) There is a boost kthread, (2) A reader needs
to be (or is in the process of being) boosted, (3) A reader is blocking
an expedited grace period, and (4) A reader is blocking a normal grace
period. This helps diagnose RCU priority boosting failures.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/tree_plugin.h')
| -rw-r--r-- | kernel/rcu/tree_plugin.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 2cbe8f8456e6..ef004cc7101d 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -1098,6 +1098,7 @@ static int rcu_boost(struct rcu_node *rnp) /* Lock only for side effect: boosts task t's priority. */ rt_mutex_lock(&rnp->boost_mtx); rt_mutex_unlock(&rnp->boost_mtx); /* Then keep lockdep happy. */ + rnp->n_boosts++; return READ_ONCE(rnp->exp_tasks) != NULL || READ_ONCE(rnp->boost_tasks) != NULL; |