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Date: Mon, 25 May 2015 20:45:25 +0300
From: Kirill Tkhai <ktkhai@...n.com>
To: <linux-kernel@...r.kernel.org>
CC: Oleg Nesterov <oleg@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...hat.com>,
"Peter Zijlstra" <peterz@...radead.org>,
Michal Hocko <mhocko@...e.cz>,
"Rik van Riel" <riel@...hat.com>,
Ionut Alexa <ionut.m.alexa@...il.com>,
Peter Hurley <peter@...leysoftware.com>,
Kirill Tkhai <tkhai@...dex.ru>
Subject: [PATCH RFC 07/13] kin_lock: Implement helpers for kin_lock locking.
Signed-off-by: Kirill Tkhai <ktkhai@...n.com>
---
include/linux/sched.h | 302 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 302 insertions(+)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 58dc09f..6a810f3 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1835,6 +1835,308 @@ static inline bool should_numa_migrate_memory(struct task_struct *p,
}
#endif
+static inline void write_real_parent_lock(struct task_struct *p)
+{
+ struct task_struct *real_parent;
+ rcu_read_lock();
+again:
+ real_parent = p->real_parent;
+ write_lock(&real_parent->kin_lock);
+ if (real_parent != p->real_parent) {
+ write_unlock(&real_parent->kin_lock);
+ goto again;
+ }
+ rcu_read_unlock();
+}
+
+static inline void write_real_parent_lock_irq(struct task_struct *p)
+{
+ local_irq_disable();
+ write_real_parent_lock(p);
+}
+
+static inline void write_real_parent_unlock(struct task_struct *p)
+{
+ write_unlock(&p->real_parent->kin_lock);
+}
+
+static inline void write_real_parent_unlock_irq(struct task_struct *p)
+{
+ write_unlock_irq(&p->real_parent->kin_lock);
+}
+
+static inline void read_parent_lock(struct task_struct *p)
+{
+ struct task_struct *parent;
+ rcu_read_lock();
+again:
+ parent = p->parent;
+ read_lock(&parent->kin_lock);
+ if (parent != p->parent) {
+ read_unlock(&parent->kin_lock);
+ goto again;
+ }
+ rcu_read_unlock();
+
+}
+
+static inline void read_parent_unlock(struct task_struct *p)
+{
+ read_unlock(&p->parent->kin_lock);
+}
+
+static inline void read_real_parent_lock(struct task_struct *p)
+{
+ struct task_struct *real_parent;
+ rcu_read_lock();
+again:
+ real_parent = p->real_parent;
+ read_lock(&real_parent->kin_lock);
+ if (real_parent != p->real_parent) {
+ read_unlock(&real_parent->kin_lock);
+ goto again;
+ }
+ rcu_read_unlock();
+
+}
+
+static inline void read_real_parent_unlock(struct task_struct *p)
+{
+ read_unlock(&p->real_parent->kin_lock);
+}
+
+static inline void write_parent_lock(struct task_struct *p)
+{
+ struct task_struct *parent;
+ rcu_read_lock();
+again:
+ parent = p->parent;
+ write_lock(&parent->kin_lock);
+ if (parent != p->parent) {
+ write_unlock(&parent->kin_lock);
+ goto again;
+ }
+ rcu_read_unlock();
+}
+
+static inline void write_parent_lock_irq(struct task_struct *p)
+{
+ local_irq_disable();
+ write_parent_lock(p);
+}
+
+static inline void write_parent_unlock(struct task_struct *p)
+{
+ write_unlock(&p->parent->kin_lock);
+}
+
+static inline void write_parent_unlock_irq(struct task_struct *p)
+{
+ write_unlock_irq(&p->parent->kin_lock);
+}
+
+static inline void write_parent_and_given_lock(struct task_struct *child,
+ struct task_struct *given)
+{
+ struct task_struct *parent;
+ rcu_read_lock();
+again:
+ parent = child->parent;
+ if (parent <= given) {
+ write_lock(&parent->kin_lock);
+ if (parent != child->parent) {
+ write_unlock(&parent->kin_lock);
+ goto again;
+ }
+ if (parent != given)
+ write_lock(&given->kin_lock);
+ } else {
+ write_lock(&given->kin_lock);
+ write_lock(&parent->kin_lock);
+ if (parent != child->parent) {
+ write_unlock(&given->kin_lock);
+ write_unlock(&parent->kin_lock);
+ goto again;
+ }
+ }
+ rcu_read_unlock();
+}
+
+static inline void write_parent_and_given_lock_irq(struct task_struct *child,
+ struct task_struct *given)
+{
+ local_irq_disable();
+ write_parent_and_given_lock(child, given);
+}
+
+static inline void read_parent_and_given_lock(struct task_struct *child,
+ struct task_struct *given)
+{
+ struct task_struct *parent;
+ rcu_read_lock();
+again:
+ parent = child->parent;
+ if (parent <= given) {
+ read_lock(&parent->kin_lock);
+ if (parent != child->parent) {
+ read_unlock(&parent->kin_lock);
+ goto again;
+ }
+ if (parent != given)
+ read_lock(&given->kin_lock);
+ } else {
+ read_lock(&given->kin_lock);
+ read_lock(&parent->kin_lock);
+ if (parent != child->parent) {
+ read_unlock(&given->kin_lock);
+ read_unlock(&parent->kin_lock);
+ goto again;
+ }
+ }
+ rcu_read_unlock();
+}
+
+static inline void read_real_parent_and_given_lock(struct task_struct *child,
+ struct task_struct *given)
+{
+ struct task_struct *real_parent;
+ rcu_read_lock();
+again:
+ real_parent = child->real_parent;
+ if (real_parent <= given) {
+ read_lock(&real_parent->kin_lock);
+ if (real_parent != child->real_parent) {
+ read_unlock(&real_parent->kin_lock);
+ goto again;
+ }
+ if (real_parent != given)
+ read_lock(&given->kin_lock);
+ } else {
+ read_lock(&given->kin_lock);
+ read_lock(&real_parent->kin_lock);
+ if (real_parent != child->real_parent) {
+ read_unlock(&given->kin_lock);
+ read_unlock(&real_parent->kin_lock);
+ goto again;
+ }
+ }
+ rcu_read_unlock();
+}
+
+static inline void read_real_parent_and_given_unlock(struct task_struct *child,
+ struct task_struct *given)
+{
+ struct task_struct *real_parent = child->real_parent;
+
+ if (real_parent != given)
+ read_unlock(&real_parent->kin_lock);
+ read_unlock(&given->kin_lock);
+}
+static inline void write_parent_and_real_parent_lock(struct task_struct *child)
+{
+ struct task_struct *parent, *real_parent;
+ rcu_read_lock();
+again:
+ parent = child->parent;
+ real_parent = child->real_parent;
+ if (parent <= real_parent) {
+ write_lock(&parent->kin_lock);
+ if (parent != child->parent) {
+ write_unlock(&parent->kin_lock);
+ goto again;
+ }
+ if (parent != real_parent) {
+ write_lock(&real_parent->kin_lock);
+ if (real_parent != child->real_parent) {
+ write_unlock(&parent->kin_lock);
+ write_unlock(&real_parent->kin_lock);
+ goto again;
+ }
+ }
+ } else {
+ write_lock(&real_parent->kin_lock);
+ write_lock(&parent->kin_lock);
+ if (real_parent != child->real_parent ||
+ parent != child->parent) {
+ write_unlock(&real_parent->kin_lock);
+ write_unlock(&parent->kin_lock);
+ goto again;
+ }
+ }
+ rcu_read_unlock();
+}
+
+static inline void write_parent_and_real_parent_lock_irq(struct task_struct *child)
+{
+ local_irq_disable();
+ write_parent_and_real_parent_lock(child);
+}
+
+static inline void write_parent_and_real_parent_unlock(struct task_struct *child)
+{
+ struct task_struct *parent, *real_parent;
+
+ parent = child->parent;
+ real_parent = child->real_parent;
+
+ write_unlock(&real_parent->kin_lock);
+ if (parent != real_parent)
+ write_unlock(&parent->kin_lock);
+}
+
+static inline void write_parent_and_real_parent_unlock_irq(struct task_struct *child)
+{
+ write_parent_and_real_parent_unlock(child);
+ local_irq_enable();
+}
+
+static inline void read_parent_and_real_parent_lock(struct task_struct *child)
+{
+ struct task_struct *parent, *real_parent;
+ rcu_read_lock();
+again:
+ parent = child->parent;
+ real_parent = child->real_parent;
+ if (parent <= real_parent) {
+ read_lock(&parent->kin_lock);
+ if (parent != child->parent) {
+ read_unlock(&parent->kin_lock);
+ goto again;
+ }
+ if (parent != real_parent) {
+ read_lock(&real_parent->kin_lock);
+ if (real_parent != child->real_parent) {
+ read_unlock(&parent->kin_lock);
+ read_unlock(&real_parent->kin_lock);
+ goto again;
+ }
+ }
+ } else {
+ read_lock(&real_parent->kin_lock);
+ read_lock(&parent->kin_lock);
+ if (real_parent != child->real_parent ||
+ parent != child->parent) {
+ read_unlock(&real_parent->kin_lock);
+ read_unlock(&parent->kin_lock);
+ goto again;
+ }
+ }
+ rcu_read_unlock();
+}
+
+static inline void read_parent_and_real_parent_unlock(struct task_struct *child)
+{
+ struct task_struct *parent, *real_parent;
+
+ parent = child->parent;
+ real_parent = child->real_parent;
+
+ read_unlock(&real_parent->kin_lock);
+ if (parent != real_parent)
+ read_unlock(&parent->kin_lock);
+}
+
+
static inline struct pid *task_pid(struct task_struct *task)
{
return task->pids[PIDTYPE_PID].pid;
--
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