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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2009-12-02 12:10:15 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-12-03 11:35:25 +0100 |
| commit | d9a3da0699b24a589b27a61e1a5b5bd30d9db669 (patch) | |
| tree | f7440e396a6c818f3cef514ccc31ab55d88025ef /kernel/rcutree.c | |
| parent | cf244dc01bf68e1ad338b82447f8686d24ea4435 (diff) | |
| download | lwn-d9a3da0699b24a589b27a61e1a5b5bd30d9db669.tar.gz lwn-d9a3da0699b24a589b27a61e1a5b5bd30d9db669.zip | |
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.c | 10 |
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]); } } } |