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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2009-06-25 09:08:16 -0700
committerIngo Molnar <mingo@elte.hu>2009-07-03 10:02:28 +0200
commit03b042bf1dc14a268a3d65d38b4ec2a4261e8477 (patch)
tree10e422a1396087d14cec164d8f4962d7ce8bcf2d /include/linux/rcutree.h
parentc17ef45342cc033fdf7bdd5b28615e0090f8d2e7 (diff)
rcu: Add synchronize_sched_expedited() primitive
This adds the synchronize_sched_expedited() primitive that implements the "big hammer" expedited RCU grace periods. This primitive is placed in kernel/sched.c rather than kernel/rcupdate.c due to its need to interact closely with the migration_thread() kthread. The idea is to wake up this kthread with req->task set to NULL, in response to which the kthread reports the quiescent state resulting from the kthread having been scheduled. Because this patch needs to fallback to the slow versions of the primitives in response to some races with CPU onlining and offlining, a new synchronize_rcu_bh() primitive is added as well. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: akpm@linux-foundation.org Cc: torvalds@linux-foundation.org Cc: davem@davemloft.net Cc: dada1@cosmosbay.com Cc: zbr@ioremap.net Cc: jeff.chua.linux@gmail.com Cc: paulus@samba.org Cc: laijs@cn.fujitsu.com Cc: jengelh@medozas.de Cc: r000n@r000n.net Cc: benh@kernel.crashing.org Cc: mathieu.desnoyers@polymtl.ca LKML-Reference: <12459460982947-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/rcutree.h')
-rw-r--r--include/linux/rcutree.h12
1 files changed, 11 insertions, 1 deletions
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
index 5a5153806c42..d4dfd2489633 100644
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -286,8 +286,14 @@ static inline void __rcu_read_unlock_bh(void)
#define call_rcu_sched(head, func) call_rcu(head, func)
-static inline void rcu_init_sched(void)
+static inline void synchronize_rcu_expedited(void)
+{
+ synchronize_sched_expedited();
+}
+
+static inline void synchronize_rcu_bh_expedited(void)
{
+ synchronize_sched_expedited();
}
extern void __rcu_init(void);
@@ -297,6 +303,10 @@ extern void rcu_restart_cpu(int cpu);
extern long rcu_batches_completed(void);
extern long rcu_batches_completed_bh(void);
+static inline void rcu_init_sched(void)
+{
+}
+
#ifdef CONFIG_NO_HZ
void rcu_enter_nohz(void);
void rcu_exit_nohz(void);