diff options
Diffstat (limited to 'kernel/rcutree_plugin.h')
| -rw-r--r-- | kernel/rcutree_plugin.h | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h index 94d9ca1e4061..bdb2e82f78d3 100644 --- a/kernel/rcutree_plugin.h +++ b/kernel/rcutree_plugin.h @@ -124,6 +124,8 @@ static void rcu_preempt_qs(int cpu) rdp->passed_quiesc_completed = rdp->gpnum - 1; barrier(); + if (rdp->passed_quiesc == 0) + trace_rcu_grace_period("rcu_preempt", rdp->gpnum, "cpuqs"); rdp->passed_quiesc = 1; current->rcu_read_unlock_special &= ~RCU_READ_UNLOCK_NEED_QS; } @@ -190,6 +192,11 @@ static void rcu_preempt_note_context_switch(int cpu) if (rnp->qsmask & rdp->grpmask) rnp->gp_tasks = &t->rcu_node_entry; } + trace_rcu_preempt_task(rdp->rsp->name, + t->pid, + (rnp->qsmask & rdp->grpmask) + ? rnp->gpnum + : rnp->gpnum + 1); raw_spin_unlock_irqrestore(&rnp->lock, flags); } else if (t->rcu_read_lock_nesting < 0 && t->rcu_read_unlock_special) { @@ -344,6 +351,8 @@ static noinline void rcu_read_unlock_special(struct task_struct *t) smp_mb(); /* ensure expedited fastpath sees end of RCU c-s. */ np = rcu_next_node_entry(t, rnp); list_del_init(&t->rcu_node_entry); + trace_rcu_unlock_preempted_task("rcu_preempt", + rnp->gpnum, t->pid); if (&t->rcu_node_entry == rnp->gp_tasks) rnp->gp_tasks = np; if (&t->rcu_node_entry == rnp->exp_tasks) @@ -364,10 +373,17 @@ static noinline void rcu_read_unlock_special(struct task_struct *t) * we aren't waiting on any CPUs, report the quiescent state. * Note that rcu_report_unblock_qs_rnp() releases rnp->lock. */ - if (empty) - raw_spin_unlock_irqrestore(&rnp->lock, flags); - else + if (!empty && !rcu_preempt_blocked_readers_cgp(rnp)) { + trace_rcu_quiescent_state_report("preempt_rcu", + rnp->gpnum, + 0, rnp->qsmask, + rnp->level, + rnp->grplo, + rnp->grphi, + !!rnp->gp_tasks); rcu_report_unblock_qs_rnp(rnp, flags); + } else + raw_spin_unlock_irqrestore(&rnp->lock, flags); #ifdef CONFIG_RCU_BOOST /* Unboost if we were boosted. */ |