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Diffstat (limited to 'kernel/rcu/tree_exp.h')
-rw-r--r--kernel/rcu/tree_exp.h36
1 files changed, 28 insertions, 8 deletions
diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h
index 46d61b597731..f72eefab8543 100644
--- a/kernel/rcu/tree_exp.h
+++ b/kernel/rcu/tree_exp.h
@@ -29,6 +29,15 @@ static void rcu_exp_gp_seq_start(struct rcu_state *rsp)
}
/*
+ * Return then value that expedited-grace-period counter will have
+ * at the end of the current grace period.
+ */
+static __maybe_unused unsigned long rcu_exp_gp_seq_endval(struct rcu_state *rsp)
+{
+ return rcu_seq_endval(&rsp->expedited_sequence);
+}
+
+/*
* Record the end of an expedited grace period.
*/
static void rcu_exp_gp_seq_end(struct rcu_state *rsp)
@@ -366,21 +375,30 @@ static void sync_rcu_exp_select_cpus(struct rcu_state *rsp,
int ret;
struct rcu_node *rnp;
+ trace_rcu_exp_grace_period(rsp->name, rcu_exp_gp_seq_endval(rsp), TPS("reset"));
sync_exp_reset_tree(rsp);
+ trace_rcu_exp_grace_period(rsp->name, rcu_exp_gp_seq_endval(rsp), TPS("select"));
rcu_for_each_leaf_node(rsp, rnp) {
raw_spin_lock_irqsave_rcu_node(rnp, flags);
/* Each pass checks a CPU for identity, offline, and idle. */
mask_ofl_test = 0;
- for_each_leaf_node_possible_cpu(rnp, cpu) {
+ for_each_leaf_node_cpu_mask(rnp, cpu, rnp->expmask) {
+ unsigned long mask = leaf_node_cpu_bit(rnp, cpu);
struct rcu_data *rdp = per_cpu_ptr(rsp->rda, cpu);
+ struct rcu_dynticks *rdtp = per_cpu_ptr(&rcu_dynticks, cpu);
+ int snap;
- rdp->exp_dynticks_snap =
- rcu_dynticks_snap(rdp->dynticks);
if (raw_smp_processor_id() == cpu ||
- rcu_dynticks_in_eqs(rdp->exp_dynticks_snap) ||
- !(rnp->qsmaskinitnext & rdp->grpmask))
- mask_ofl_test |= rdp->grpmask;
+ !(rnp->qsmaskinitnext & mask)) {
+ mask_ofl_test |= mask;
+ } else {
+ snap = rcu_dynticks_snap(rdtp);
+ if (rcu_dynticks_in_eqs(snap))
+ mask_ofl_test |= mask;
+ else
+ rdp->exp_dynticks_snap = snap;
+ }
}
mask_ofl_ipi = rnp->expmask & ~mask_ofl_test;
@@ -394,7 +412,7 @@ static void sync_rcu_exp_select_cpus(struct rcu_state *rsp,
raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
/* IPI the remaining CPUs for expedited quiescent state. */
- for_each_leaf_node_possible_cpu(rnp, cpu) {
+ for_each_leaf_node_cpu_mask(rnp, cpu, rnp->expmask) {
unsigned long mask = leaf_node_cpu_bit(rnp, cpu);
struct rcu_data *rdp = per_cpu_ptr(rsp->rda, cpu);
@@ -417,6 +435,7 @@ retry_ipi:
(rnp->expmask & mask)) {
/* Online, so delay for a bit and try again. */
raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
+ trace_rcu_exp_grace_period(rsp->name, rcu_exp_gp_seq_endval(rsp), TPS("selectofl"));
schedule_timeout_uninterruptible(1);
goto retry_ipi;
}
@@ -443,6 +462,7 @@ static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
struct rcu_node *rnp_root = rcu_get_root(rsp);
int ret;
+ trace_rcu_exp_grace_period(rsp->name, rcu_exp_gp_seq_endval(rsp), TPS("startwait"));
jiffies_stall = rcu_jiffies_till_stall_check();
jiffies_start = jiffies;
@@ -606,7 +626,7 @@ static void _synchronize_rcu_expedited(struct rcu_state *rsp,
rew.rew_rsp = rsp;
rew.rew_s = s;
INIT_WORK_ONSTACK(&rew.rew_work, wait_rcu_exp_gp);
- schedule_work(&rew.rew_work);
+ queue_work(rcu_gp_wq, &rew.rew_work);
}
/* Wait for expedited grace period to complete. */