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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2009-12-02 12:10:15 -0800
committerIngo Molnar <mingo@elte.hu>2009-12-03 11:35:25 +0100
commitd9a3da0699b24a589b27a61e1a5b5bd30d9db669 (patch)
treef7440e396a6c818f3cef514ccc31ab55d88025ef /kernel/rcutree.c
parentcf244dc01bf68e1ad338b82447f8686d24ea4435 (diff)
downloadlinux-d9a3da0699b24a589b27a61e1a5b5bd30d9db669.tar.bz2
rcu: Add expedited grace-period support for preemptible RCU
Implement an synchronize_rcu_expedited() for preemptible RCU that actually is expedited. This uses synchronize_sched_expedited() to force all threads currently running in a preemptible-RCU read-side critical section onto the appropriate ->blocked_tasks[] list, then takes a snapshot of all of these lists and waits for them to drain. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <1259784616158-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/rcutree.c')
-rw-r--r--kernel/rcutree.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index d47e03e5792a..53ae9598f798 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -948,7 +948,7 @@ static void __rcu_offline_cpu(int cpu, struct rcu_state *rsp)
{
unsigned long flags;
unsigned long mask;
- int need_quiet = 0;
+ int need_report = 0;
struct rcu_data *rdp = rsp->rda[cpu];
struct rcu_node *rnp;
@@ -967,7 +967,7 @@ static void __rcu_offline_cpu(int cpu, struct rcu_state *rsp)
break;
}
if (rnp == rdp->mynode)
- need_quiet = rcu_preempt_offline_tasks(rsp, rnp, rdp);
+ need_report = rcu_preempt_offline_tasks(rsp, rnp, rdp);
else
spin_unlock(&rnp->lock); /* irqs remain disabled. */
mask = rnp->grpmask;
@@ -982,10 +982,12 @@ static void __rcu_offline_cpu(int cpu, struct rcu_state *rsp)
*/
spin_unlock(&rsp->onofflock); /* irqs remain disabled. */
rnp = rdp->mynode;
- if (need_quiet)
+ if (need_report & RCU_OFL_TASKS_NORM_GP)
rcu_report_unblock_qs_rnp(rnp, flags);
else
spin_unlock_irqrestore(&rnp->lock, flags);
+ if (need_report & RCU_OFL_TASKS_EXP_GP)
+ rcu_report_exp_rnp(rsp, rnp);
rcu_adopt_orphan_cbs(rsp);
}
@@ -1843,6 +1845,8 @@ static void __init rcu_init_one(struct rcu_state *rsp)
rnp->level = i;
INIT_LIST_HEAD(&rnp->blocked_tasks[0]);
INIT_LIST_HEAD(&rnp->blocked_tasks[1]);
+ INIT_LIST_HEAD(&rnp->blocked_tasks[2]);
+ INIT_LIST_HEAD(&rnp->blocked_tasks[3]);
}
}
}