diff options
-rw-r--r-- | kernel/rcu/rcu_segcblist.h | 11 | ||||
-rw-r--r-- | kernel/rcu/tree_plugin.h | 39 |
2 files changed, 43 insertions, 7 deletions
diff --git a/kernel/rcu/rcu_segcblist.h b/kernel/rcu/rcu_segcblist.h index afad6fc6311c..311060279f1a 100644 --- a/kernel/rcu/rcu_segcblist.h +++ b/kernel/rcu/rcu_segcblist.h @@ -117,6 +117,17 @@ static inline bool rcu_segcblist_restempty(struct rcu_segcblist *rsclp, int seg) return !READ_ONCE(*READ_ONCE(rsclp->tails[seg])); } +/* + * Is the specified segment of the specified rcu_segcblist structure + * empty of callbacks? + */ +static inline bool rcu_segcblist_segempty(struct rcu_segcblist *rsclp, int seg) +{ + if (seg == RCU_DONE_TAIL) + return &rsclp->head == rsclp->tails[RCU_DONE_TAIL]; + return rsclp->tails[seg - 1] == rsclp->tails[seg]; +} + void rcu_segcblist_inc_len(struct rcu_segcblist *rsclp); void rcu_segcblist_add_len(struct rcu_segcblist *rsclp, long v); void rcu_segcblist_init(struct rcu_segcblist *rsclp); diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 8641b72f6d0d..5ee1113fbf39 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -2672,6 +2672,19 @@ void rcu_bind_current_to_nocb(void) } EXPORT_SYMBOL_GPL(rcu_bind_current_to_nocb); +// The ->on_cpu field is available only in CONFIG_SMP=y, so... +#ifdef CONFIG_SMP +static char *show_rcu_should_be_on_cpu(struct task_struct *tsp) +{ + return tsp && tsp->state == TASK_RUNNING && !tsp->on_cpu ? "!" : ""; +} +#else // #ifdef CONFIG_SMP +static char *show_rcu_should_be_on_cpu(struct task_struct *tsp) +{ + return ""; +} +#endif // #else #ifdef CONFIG_SMP + /* * Dump out nocb grace-period kthread state for the specified rcu_data * structure. @@ -2680,7 +2693,7 @@ static void show_rcu_nocb_gp_state(struct rcu_data *rdp) { struct rcu_node *rnp = rdp->mynode; - pr_info("nocb GP %d %c%c%c%c%c%c %c[%c%c] %c%c:%ld rnp %d:%d %lu\n", + pr_info("nocb GP %d %c%c%c%c%c%c %c[%c%c] %c%c:%ld rnp %d:%d %lu %c CPU %d%s\n", rdp->cpu, "kK"[!!rdp->nocb_gp_kthread], "lL"[raw_spin_is_locked(&rdp->nocb_gp_lock)], @@ -2694,12 +2707,17 @@ static void show_rcu_nocb_gp_state(struct rcu_data *rdp) ".B"[!!rdp->nocb_gp_bypass], ".G"[!!rdp->nocb_gp_gp], (long)rdp->nocb_gp_seq, - rnp->grplo, rnp->grphi, READ_ONCE(rdp->nocb_gp_loops)); + rnp->grplo, rnp->grphi, READ_ONCE(rdp->nocb_gp_loops), + rdp->nocb_gp_kthread ? task_state_to_char(rdp->nocb_gp_kthread) : '.', + rdp->nocb_cb_kthread ? (int)task_cpu(rdp->nocb_gp_kthread) : -1, + show_rcu_should_be_on_cpu(rdp->nocb_cb_kthread)); } /* Dump out nocb kthread state for the specified rcu_data structure. */ static void show_rcu_nocb_state(struct rcu_data *rdp) { + char bufw[20]; + char bufr[20]; struct rcu_segcblist *rsclp = &rdp->cblist; bool waslocked; bool wastimer; @@ -2708,7 +2726,9 @@ static void show_rcu_nocb_state(struct rcu_data *rdp) if (rdp->nocb_gp_rdp == rdp) show_rcu_nocb_gp_state(rdp); - pr_info(" CB %d->%d %c%c%c%c%c%c F%ld L%ld C%d %c%c%c%c%c q%ld\n", + sprintf(bufw, "%ld", rsclp->gp_seq[RCU_WAIT_TAIL]); + sprintf(bufr, "%ld", rsclp->gp_seq[RCU_NEXT_READY_TAIL]); + pr_info(" CB %d^%d->%d %c%c%c%c%c%c F%ld L%ld C%d %c%c%s%c%s%c%c q%ld %c CPU %d%s\n", rdp->cpu, rdp->nocb_gp_rdp->cpu, "kK"[!!rdp->nocb_cb_kthread], "bB"[raw_spin_is_locked(&rdp->nocb_bypass_lock)], @@ -2720,11 +2740,16 @@ static void show_rcu_nocb_state(struct rcu_data *rdp) jiffies - rdp->nocb_nobypass_last, rdp->nocb_nobypass_count, ".D"[rcu_segcblist_ready_cbs(rsclp)], - ".W"[!rcu_segcblist_restempty(rsclp, RCU_DONE_TAIL)], - ".R"[!rcu_segcblist_restempty(rsclp, RCU_WAIT_TAIL)], - ".N"[!rcu_segcblist_restempty(rsclp, RCU_NEXT_READY_TAIL)], + ".W"[!rcu_segcblist_segempty(rsclp, RCU_WAIT_TAIL)], + rcu_segcblist_segempty(rsclp, RCU_WAIT_TAIL) ? "" : bufw, + ".R"[!rcu_segcblist_segempty(rsclp, RCU_NEXT_READY_TAIL)], + rcu_segcblist_segempty(rsclp, RCU_NEXT_READY_TAIL) ? "" : bufr, + ".N"[!rcu_segcblist_segempty(rsclp, RCU_NEXT_TAIL)], ".B"[!!rcu_cblist_n_cbs(&rdp->nocb_bypass)], - rcu_segcblist_n_cbs(&rdp->cblist)); + rcu_segcblist_n_cbs(&rdp->cblist), + rdp->nocb_cb_kthread ? task_state_to_char(rdp->nocb_cb_kthread) : '.', + rdp->nocb_cb_kthread ? (int)task_cpu(rdp->nocb_gp_kthread) : -1, + show_rcu_should_be_on_cpu(rdp->nocb_cb_kthread)); /* It is OK for GP kthreads to have GP state. */ if (rdp->nocb_gp_rdp == rdp) |