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authorIngo Molnar <mingo@elte.hu>2006-01-08 01:01:37 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 20:13:40 -0800
commite56d090310d7625ecb43a1eeebd479f04affb48b (patch)
tree2f479215dff4a2d8f3a9ed85200a5bc4f51534be /include/linux
parent4369ef3c3e9d3bd9b879580678778f558d481e90 (diff)
downloadop-kernel-dev-e56d090310d7625ecb43a1eeebd479f04affb48b.zip
op-kernel-dev-e56d090310d7625ecb43a1eeebd479f04affb48b.tar.gz
[PATCH] RCU signal handling
RCU tasklist_lock and RCU signal handling: send signals RCU-read-locked instead of tasklist_lock read-locked. This is a scalability improvement on SMP and a preemption-latency improvement under PREEMPT_RCU. Signed-off-by: Paul E. McKenney <paulmck@us.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Acked-by: William Irwin <wli@holomorphy.com> Cc: Roland McGrath <roland@redhat.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/sched.h32
1 files changed, 30 insertions, 2 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index a746620..a6af77e 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -34,6 +34,7 @@
#include <linux/percpu.h>
#include <linux/topology.h>
#include <linux/seccomp.h>
+#include <linux/rcupdate.h>
#include <linux/auxvec.h> /* For AT_VECTOR_SIZE */
@@ -350,8 +351,16 @@ struct sighand_struct {
atomic_t count;
struct k_sigaction action[_NSIG];
spinlock_t siglock;
+ struct rcu_head rcu;
};
+extern void sighand_free_cb(struct rcu_head *rhp);
+
+static inline void sighand_free(struct sighand_struct *sp)
+{
+ call_rcu(&sp->rcu, sighand_free_cb);
+}
+
/*
* NOTE! "signal_struct" does not have it's own
* locking, because a shared signal_struct always
@@ -844,6 +853,7 @@ struct task_struct {
int cpuset_mems_generation;
#endif
atomic_t fs_excl; /* holding fs exclusive resources */
+ struct rcu_head rcu;
};
static inline pid_t process_group(struct task_struct *tsk)
@@ -867,8 +877,26 @@ static inline int pid_alive(struct task_struct *p)
extern void free_task(struct task_struct *tsk);
extern void __put_task_struct(struct task_struct *tsk);
#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
-#define put_task_struct(tsk) \
-do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
+
+static inline int get_task_struct_rcu(struct task_struct *t)
+{
+ int oldusage;
+
+ do {
+ oldusage = atomic_read(&t->usage);
+ if (oldusage == 0)
+ return 0;
+ } while (cmpxchg(&t->usage.counter, oldusage, oldusage+1) != oldusage);
+ return 1;
+}
+
+extern void __put_task_struct_cb(struct rcu_head *rhp);
+
+static inline void put_task_struct(struct task_struct *t)
+{
+ if (atomic_dec_and_test(&t->usage))
+ call_rcu(&t->rcu, __put_task_struct_cb);
+}
/*
* Per process flags
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