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Message-ID: <20140121193909.GA17497@redhat.com>
Date: Tue, 21 Jan 2014 20:39:09 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Dave Jones <davej@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Alan Stern <stern@...land.harvard.edu>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Ingo Molnar <mingo@...nel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Paul McKenney <paulmck@...ux.vnet.ibm.com>,
Steven Rostedt <rostedt@...dmis.org>,
Thomas Gleixner <tglx@...utronix.de>,
linux-kernel@...r.kernel.org
Subject: uninline rcu_lock_acquire/etc ?
On 01/21, Oleg Nesterov wrote:
>
> But I agreed that the code looks simpler with bitfields, so perhaps
> this patch is better.
Besides, I guess the major offender is rcu...
Paul, can't we do something like below? Saves 19.5 kilobytes,
- 5255131 2974376 10125312 18354819 1181283 vmlinux
+ 5235227 2970344 10125312 18330883 117b503 vmlinux
probably we can also uninline rcu_lockdep_assert()...
Oleg.
---
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 2eef290..58f7a97 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -310,18 +310,34 @@ static inline bool rcu_lockdep_current_cpu_online(void)
}
#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PROVE_RCU) */
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-
-static inline void rcu_lock_acquire(struct lockdep_map *map)
+static inline void __rcu_lock_acquire(struct lockdep_map *map, unsigned long ip)
{
- lock_acquire(map, 0, 0, 2, 0, NULL, _THIS_IP_);
+ lock_acquire(map, 0, 0, 2, 0, NULL, ip);
}
-static inline void rcu_lock_release(struct lockdep_map *map)
+static inline void __rcu_lock_release(struct lockdep_map *map, unsigned long ip)
{
lock_release(map, 1, _THIS_IP_);
}
+#if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_PROVE_RCU)
+extern void rcu_lock_acquire(void);
+extern void rcu_lock_release(void);
+extern void rcu_lock_acquire_bh(void);
+extern void rcu_lock_release_bh(void);
+extern void rcu_lock_acquire_sched(void);
+extern void rcu_lock_release_sched(void);
+#else
+#define rcu_lock_acquire() do { } while (0)
+#define rcu_lock_release() do { } while (0)
+#define rcu_lock_acquire_bh() do { } while (0)
+#define rcu_lock_release_bh() do { } while (0)
+#define rcu_lock_acquire_sched() do { } while (0)
+#define rcu_lock_release_sched() do { } while (0)
+#endif
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+
extern struct lockdep_map rcu_lock_map;
extern struct lockdep_map rcu_bh_lock_map;
extern struct lockdep_map rcu_sched_lock_map;
@@ -419,9 +435,6 @@ static inline int rcu_read_lock_sched_held(void)
#else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
-# define rcu_lock_acquire(a) do { } while (0)
-# define rcu_lock_release(a) do { } while (0)
-
static inline int rcu_read_lock_held(void)
{
return 1;
@@ -766,11 +779,9 @@ static inline void rcu_preempt_sleep_check(void)
*/
static inline void rcu_read_lock(void)
{
- __rcu_read_lock();
__acquire(RCU);
- rcu_lock_acquire(&rcu_lock_map);
- rcu_lockdep_assert(rcu_is_watching(),
- "rcu_read_lock() used illegally while idle");
+ __rcu_read_lock();
+ rcu_lock_acquire();
}
/*
@@ -790,11 +801,9 @@ static inline void rcu_read_lock(void)
*/
static inline void rcu_read_unlock(void)
{
- rcu_lockdep_assert(rcu_is_watching(),
- "rcu_read_unlock() used illegally while idle");
- rcu_lock_release(&rcu_lock_map);
- __release(RCU);
+ rcu_lock_release();
__rcu_read_unlock();
+ __release(RCU);
}
/**
@@ -816,11 +825,9 @@ static inline void rcu_read_unlock(void)
*/
static inline void rcu_read_lock_bh(void)
{
- local_bh_disable();
__acquire(RCU_BH);
- rcu_lock_acquire(&rcu_bh_lock_map);
- rcu_lockdep_assert(rcu_is_watching(),
- "rcu_read_lock_bh() used illegally while idle");
+ local_bh_disable();
+ rcu_lock_acquire_bh();
}
/*
@@ -830,11 +837,9 @@ static inline void rcu_read_lock_bh(void)
*/
static inline void rcu_read_unlock_bh(void)
{
- rcu_lockdep_assert(rcu_is_watching(),
- "rcu_read_unlock_bh() used illegally while idle");
- rcu_lock_release(&rcu_bh_lock_map);
- __release(RCU_BH);
+ rcu_lock_release_bh();
local_bh_enable();
+ __release(RCU_BH);
}
/**
@@ -852,9 +857,9 @@ static inline void rcu_read_unlock_bh(void)
*/
static inline void rcu_read_lock_sched(void)
{
- preempt_disable();
__acquire(RCU_SCHED);
- rcu_lock_acquire(&rcu_sched_lock_map);
+ preempt_disable();
+ rcu_lock_acquire_sched();
rcu_lockdep_assert(rcu_is_watching(),
"rcu_read_lock_sched() used illegally while idle");
}
@@ -862,8 +867,8 @@ static inline void rcu_read_lock_sched(void)
/* Used by lockdep and tracing: cannot be traced, cannot call lockdep. */
static inline notrace void rcu_read_lock_sched_notrace(void)
{
- preempt_disable_notrace();
__acquire(RCU_SCHED);
+ preempt_disable_notrace();
}
/*
@@ -873,18 +878,16 @@ static inline notrace void rcu_read_lock_sched_notrace(void)
*/
static inline void rcu_read_unlock_sched(void)
{
- rcu_lockdep_assert(rcu_is_watching(),
- "rcu_read_unlock_sched() used illegally while idle");
- rcu_lock_release(&rcu_sched_lock_map);
- __release(RCU_SCHED);
+ rcu_lock_release_sched();
preempt_enable();
+ __release(RCU_SCHED);
}
/* Used by lockdep and tracing: cannot be traced, cannot call lockdep. */
static inline notrace void rcu_read_unlock_sched_notrace(void)
{
- __release(RCU_SCHED);
preempt_enable_notrace();
+ __release(RCU_SCHED);
}
/**
diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index 9b058ee..9b0f568 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -219,7 +219,7 @@ static inline int srcu_read_lock(struct srcu_struct *sp) __acquires(sp)
{
int retval = __srcu_read_lock(sp);
- rcu_lock_acquire(&(sp)->dep_map);
+ __rcu_lock_acquire(&(sp)->dep_map, _THIS_IP_);
return retval;
}
@@ -233,7 +233,7 @@ static inline int srcu_read_lock(struct srcu_struct *sp) __acquires(sp)
static inline void srcu_read_unlock(struct srcu_struct *sp, int idx)
__releases(sp)
{
- rcu_lock_release(&(sp)->dep_map);
+ __rcu_lock_release(&(sp)->dep_map, _THIS_IP_);
__srcu_read_unlock(sp, idx);
}
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index a3596c8..19ff915 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -333,4 +333,47 @@ static int __init check_cpu_stall_init(void)
}
early_initcall(check_cpu_stall_init);
+#if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_PROVE_RCU)
+
+static void ck_rcu_is_watching(const char *message)
+{
+ rcu_lockdep_assert(rcu_is_watching(), message);
+}
+
+void rcu_lock_acquire(void)
+{
+ __rcu_lock_acquire(&rcu_lock_map, _RET_IP_);
+ ck_rcu_is_watching("rcu_read_lock() used illegally while idle");
+}
+
+void rcu_lock_release(void)
+{
+ ck_rcu_is_watching("rcu_read_unlock() used illegally while idle");
+ __rcu_lock_release(&rcu_lock_map, _RET_IP_);
+}
+
+void rcu_lock_acquire_bh(void)
+{
+ __rcu_lock_acquire(&rcu_bh_lock_map, _RET_IP_);
+ ck_rcu_is_watching("rcu_read_lock_bh() used illegally while idle");
+}
+
+void rcu_lock_release_bh(void)
+{
+ ck_rcu_is_watching("rcu_read_unlock_bh() used illegally while idle");
+ __rcu_lock_release(&rcu_bh_lock_map, _RET_IP_);
+}
+void rcu_lock_acquire_sched(void)
+{
+ __rcu_lock_acquire(&rcu_sched_lock_map, _RET_IP_);
+ ck_rcu_is_watching("rcu_read_lock_sched() used illegally while idle");
+}
+
+void rcu_lock_release_sched(void)
+{
+ ck_rcu_is_watching("rcu_read_unlock_sched() used illegally while idle");
+ __rcu_lock_release(&rcu_sched_lock_map, _RET_IP_);
+}
+#endif
+
#endif /* #ifdef CONFIG_RCU_STALL_COMMON */
--
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