Jetpack/kernel/kernel-4.9/rt-patches/0187-rcu-Merge-RCU-bh-into-...

381 lines
11 KiB
Diff

From e8a2caa5188b64f68162a7cd4a160812dd5db33a Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 5 Oct 2011 11:59:38 -0700
Subject: [PATCH 187/352] rcu: Merge RCU-bh into RCU-preempt
The Linux kernel has long RCU-bh read-side critical sections that
intolerably increase scheduling latency under mainline's RCU-bh rules,
which include RCU-bh read-side critical sections being non-preemptible.
This patch therefore arranges for RCU-bh to be implemented in terms of
RCU-preempt for CONFIG_PREEMPT_RT_FULL=y.
This has the downside of defeating the purpose of RCU-bh, namely,
handling the case where the system is subjected to a network-based
denial-of-service attack that keeps at least one CPU doing full-time
softirq processing. This issue will be fixed by a later commit.
The current commit will need some work to make it appropriate for
mainline use, for example, it needs to be extended to cover Tiny RCU.
[ paulmck: Added a useful changelog ]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20111005185938.GA20403@linux.vnet.ibm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/rcupdate.h | 23 +++++++++++++++++++++++
include/linux/rcutree.h | 21 ++++++++++++++++++---
kernel/rcu/rcutorture.c | 7 +++++++
kernel/rcu/tree.c | 24 ++++++++++++++++++++++++
kernel/rcu/tree.h | 2 ++
kernel/rcu/update.c | 2 ++
6 files changed, 76 insertions(+), 3 deletions(-)
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index a5b130e..c19c711 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -179,6 +179,9 @@ void call_rcu(struct rcu_head *head,
#endif /* #else #ifdef CONFIG_PREEMPT_RCU */
+#ifdef CONFIG_PREEMPT_RT_FULL
+#define call_rcu_bh call_rcu
+#else
/**
* call_rcu_bh() - Queue an RCU for invocation after a quicker grace period.
* @head: structure to be used for queueing the RCU updates.
@@ -202,6 +205,7 @@ void call_rcu(struct rcu_head *head,
*/
void call_rcu_bh(struct rcu_head *head,
rcu_callback_t func);
+#endif
/**
* call_rcu_sched() - Queue an RCU for invocation after sched grace period.
@@ -339,7 +343,11 @@ static inline int rcu_preempt_depth(void)
/* Internal to kernel */
void rcu_init(void);
void rcu_sched_qs(void);
+#ifdef CONFIG_PREEMPT_RT_FULL
+static inline void rcu_bh_qs(void) { }
+#else
void rcu_bh_qs(void);
+#endif
void rcu_check_callbacks(int user);
void rcu_report_dead(unsigned int cpu);
void rcu_cpu_starting(unsigned int cpu);
@@ -513,7 +521,14 @@ extern struct lockdep_map rcu_callback_map;
int debug_lockdep_rcu_enabled(void);
int rcu_read_lock_held(void);
+#ifdef CONFIG_PREEMPT_RT_FULL
+static inline int rcu_read_lock_bh_held(void)
+{
+ return rcu_read_lock_held();
+}
+#else
int rcu_read_lock_bh_held(void);
+#endif
/**
* rcu_read_lock_sched_held() - might we be in RCU-sched read-side critical section?
@@ -911,10 +926,14 @@ static inline void rcu_read_unlock(void)
static inline void rcu_read_lock_bh(void)
{
local_bh_disable();
+#ifdef CONFIG_PREEMPT_RT_FULL
+ rcu_read_lock();
+#else
__acquire(RCU_BH);
rcu_lock_acquire(&rcu_bh_lock_map);
RCU_LOCKDEP_WARN(!rcu_is_watching(),
"rcu_read_lock_bh() used illegally while idle");
+#endif
}
/*
@@ -924,10 +943,14 @@ static inline void rcu_read_lock_bh(void)
*/
static inline void rcu_read_unlock_bh(void)
{
+#ifdef CONFIG_PREEMPT_RT_FULL
+ rcu_read_unlock();
+#else
RCU_LOCKDEP_WARN(!rcu_is_watching(),
"rcu_read_unlock_bh() used illegally while idle");
rcu_lock_release(&rcu_bh_lock_map);
__release(RCU_BH);
+#endif
local_bh_enable();
}
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
index 63a4e4c..08ab12d 100644
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -44,7 +44,11 @@ static inline void rcu_virt_note_context_switch(int cpu)
rcu_note_context_switch();
}
+#ifdef CONFIG_PREEMPT_RT_FULL
+# define synchronize_rcu_bh synchronize_rcu
+#else
void synchronize_rcu_bh(void);
+#endif
void synchronize_sched_expedited(void);
void synchronize_rcu_expedited(void);
@@ -72,7 +76,11 @@ static inline void synchronize_rcu_bh_expedited(void)
}
void rcu_barrier(void);
+#ifdef CONFIG_PREEMPT_RT_FULL
+# define rcu_barrier_bh rcu_barrier
+#else
void rcu_barrier_bh(void);
+#endif
void rcu_barrier_sched(void);
unsigned long get_state_synchronize_rcu(void);
void cond_synchronize_rcu(unsigned long oldstate);
@@ -82,17 +90,14 @@ void cond_synchronize_sched(unsigned long oldstate);
extern unsigned long rcutorture_testseq;
extern unsigned long rcutorture_vernum;
unsigned long rcu_batches_started(void);
-unsigned long rcu_batches_started_bh(void);
unsigned long rcu_batches_started_sched(void);
unsigned long rcu_batches_completed(void);
-unsigned long rcu_batches_completed_bh(void);
unsigned long rcu_batches_completed_sched(void);
unsigned long rcu_exp_batches_completed(void);
unsigned long rcu_exp_batches_completed_sched(void);
void show_rcu_gp_kthreads(void);
void rcu_force_quiescent_state(void);
-void rcu_bh_force_quiescent_state(void);
void rcu_sched_force_quiescent_state(void);
void rcu_idle_enter(void);
@@ -109,6 +114,16 @@ extern int rcu_scheduler_active __read_mostly;
bool rcu_is_watching(void);
+#ifndef CONFIG_PREEMPT_RT_FULL
+void rcu_bh_force_quiescent_state(void);
+unsigned long rcu_batches_started_bh(void);
+unsigned long rcu_batches_completed_bh(void);
+#else
+# define rcu_bh_force_quiescent_state rcu_force_quiescent_state
+# define rcu_batches_completed_bh rcu_batches_completed
+# define rcu_batches_started_bh rcu_batches_completed
+#endif
+
void rcu_all_qs(void);
/* RCUtree hotplug events */
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index bf08fee..eeb8ce4 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -404,6 +404,7 @@ static struct rcu_torture_ops rcu_ops = {
.name = "rcu"
};
+#ifndef CONFIG_PREEMPT_RT_FULL
/*
* Definitions for rcu_bh torture testing.
*/
@@ -443,6 +444,12 @@ static struct rcu_torture_ops rcu_bh_ops = {
.name = "rcu_bh"
};
+#else
+static struct rcu_torture_ops rcu_bh_ops = {
+ .ttype = INVALID_RCU_FLAVOR,
+};
+#endif
+
/*
* Don't even think about trying any of these in real life!!!
* The names includes "busted", and they really means it!
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index d1a0287..2653613 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -260,6 +260,7 @@ void rcu_sched_qs(void)
this_cpu_ptr(&rcu_sched_data), true);
}
+#ifndef CONFIG_PREEMPT_RT_FULL
void rcu_bh_qs(void)
{
if (__this_cpu_read(rcu_bh_data.cpu_no_qs.s)) {
@@ -269,6 +270,7 @@ void rcu_bh_qs(void)
__this_cpu_write(rcu_bh_data.cpu_no_qs.b.norm, false);
}
}
+#endif
static DEFINE_PER_CPU(int, rcu_sched_qs_mask);
@@ -449,11 +451,13 @@ EXPORT_SYMBOL_GPL(rcu_batches_started_sched);
/*
* Return the number of RCU BH batches started thus far for debug & stats.
*/
+#ifndef CONFIG_PREEMPT_RT_FULL
unsigned long rcu_batches_started_bh(void)
{
return rcu_bh_state.gpnum;
}
EXPORT_SYMBOL_GPL(rcu_batches_started_bh);
+#endif
/*
* Return the number of RCU batches completed thus far for debug & stats.
@@ -473,6 +477,7 @@ unsigned long rcu_batches_completed_sched(void)
}
EXPORT_SYMBOL_GPL(rcu_batches_completed_sched);
+#ifndef CONFIG_PREEMPT_RT_FULL
/*
* Return the number of RCU BH batches completed thus far for debug & stats.
*/
@@ -481,6 +486,7 @@ unsigned long rcu_batches_completed_bh(void)
return rcu_bh_state.completed;
}
EXPORT_SYMBOL_GPL(rcu_batches_completed_bh);
+#endif
/*
* Return the number of RCU expedited batches completed thus far for
@@ -504,6 +510,7 @@ unsigned long rcu_exp_batches_completed_sched(void)
}
EXPORT_SYMBOL_GPL(rcu_exp_batches_completed_sched);
+#ifndef CONFIG_PREEMPT_RT_FULL
/*
* Force a quiescent state.
*/
@@ -522,6 +529,13 @@ void rcu_bh_force_quiescent_state(void)
}
EXPORT_SYMBOL_GPL(rcu_bh_force_quiescent_state);
+#else
+void rcu_force_quiescent_state(void)
+{
+}
+EXPORT_SYMBOL_GPL(rcu_force_quiescent_state);
+#endif
+
/*
* Force a quiescent state for RCU-sched.
*/
@@ -572,9 +586,11 @@ void rcutorture_get_gp_data(enum rcutorture_type test_type, int *flags,
case RCU_FLAVOR:
rsp = rcu_state_p;
break;
+#ifndef CONFIG_PREEMPT_RT_FULL
case RCU_BH_FLAVOR:
rsp = &rcu_bh_state;
break;
+#endif
case RCU_SCHED_FLAVOR:
rsp = &rcu_sched_state;
break;
@@ -3205,6 +3221,7 @@ void call_rcu_sched(struct rcu_head *head, rcu_callback_t func)
}
EXPORT_SYMBOL_GPL(call_rcu_sched);
+#ifndef CONFIG_PREEMPT_RT_FULL
/*
* Queue an RCU callback for invocation after a quicker grace period.
*/
@@ -3213,6 +3230,7 @@ void call_rcu_bh(struct rcu_head *head, rcu_callback_t func)
__call_rcu(head, func, &rcu_bh_state, -1, 0);
}
EXPORT_SYMBOL_GPL(call_rcu_bh);
+#endif
/*
* Queue an RCU callback for lazy invocation after a grace period.
@@ -3304,6 +3322,7 @@ void synchronize_sched(void)
}
EXPORT_SYMBOL_GPL(synchronize_sched);
+#ifndef CONFIG_PREEMPT_RT_FULL
/**
* synchronize_rcu_bh - wait until an rcu_bh grace period has elapsed.
*
@@ -3330,6 +3349,7 @@ void synchronize_rcu_bh(void)
wait_rcu_gp(call_rcu_bh);
}
EXPORT_SYMBOL_GPL(synchronize_rcu_bh);
+#endif
/**
* get_state_synchronize_rcu - Snapshot current RCU state
@@ -3708,6 +3728,7 @@ static void _rcu_barrier(struct rcu_state *rsp)
mutex_unlock(&rsp->barrier_mutex);
}
+#ifndef CONFIG_PREEMPT_RT_FULL
/**
* rcu_barrier_bh - Wait until all in-flight call_rcu_bh() callbacks complete.
*/
@@ -3716,6 +3737,7 @@ void rcu_barrier_bh(void)
_rcu_barrier(&rcu_bh_state);
}
EXPORT_SYMBOL_GPL(rcu_barrier_bh);
+#endif
/**
* rcu_barrier_sched - Wait for in-flight call_rcu_sched() callbacks.
@@ -4237,7 +4259,9 @@ void __init rcu_init(void)
rcu_bootup_announce();
rcu_init_geometry();
+#ifndef CONFIG_PREEMPT_RT_FULL
rcu_init_one(&rcu_bh_state);
+#endif
rcu_init_one(&rcu_sched_state);
if (dump_tree)
rcu_dump_rcu_node_tree(&rcu_sched_state);
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index e99a523..e803255 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -588,7 +588,9 @@ extern struct list_head rcu_struct_flavors;
*/
extern struct rcu_state rcu_sched_state;
+#ifndef CONFIG_PREEMPT_RT_FULL
extern struct rcu_state rcu_bh_state;
+#endif
#ifdef CONFIG_PREEMPT_RCU
extern struct rcu_state rcu_preempt_state;
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index 019b470..949714f 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -296,6 +296,7 @@ int rcu_read_lock_held(void)
}
EXPORT_SYMBOL_GPL(rcu_read_lock_held);
+#ifndef CONFIG_PREEMPT_RT_FULL
/**
* rcu_read_lock_bh_held() - might we be in RCU-bh read-side critical section?
*
@@ -322,6 +323,7 @@ int rcu_read_lock_bh_held(void)
return in_softirq() || irqs_disabled();
}
EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held);
+#endif
#endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
--
2.7.4