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authorIngo Molnar <mingo@kernel.org>2013-09-03 07:41:11 +0200
committerIngo Molnar <mingo@kernel.org>2013-09-03 07:41:11 +0200
commit7d992feb7694a21ee81f22894b455dadd5d1c110 (patch)
treed0f0961186b1c31c536a26a7f986ad7ca677453b /include
parent6e4664525b1db28f8c4e1130957f70a94c19213e (diff)
parent25f27ce4a6a4995c8bdd69b4b2180465ed5ad2b8 (diff)
Merge branch 'rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu
Pull RCU updates from Paul E. McKenney: " * Update RCU documentation. These were posted to LKML at https://lkml.org/lkml/2013/8/19/611. * Miscellaneous fixes. These were posted to LKML at https://lkml.org/lkml/2013/8/19/619. * Full-system idle detection. This is for use by Frederic Weisbecker's adaptive-ticks mechanism. Its purpose is to allow the timekeeping CPU to shut off its tick when all other CPUs are idle. These were posted to LKML at https://lkml.org/lkml/2013/8/19/648. * Improve rcutorture test coverage. These were posted to LKML at https://lkml.org/lkml/2013/8/19/675. " Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-generic/vmlinux.lds.h7
-rw-r--r--include/linux/debugobjects.h6
-rw-r--r--include/linux/ftrace_event.h34
-rw-r--r--include/linux/jiffies.h8
-rw-r--r--include/linux/rculist.h5
-rw-r--r--include/linux/rcupdate.h26
-rw-r--r--include/trace/events/rcu.h82
7 files changed, 111 insertions, 57 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 69732d279e8b..83e2c31e8b00 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -122,8 +122,12 @@
#define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \
*(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
+#define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .; \
+ *(__tracepoint_str) /* Trace_printk fmt' pointer */ \
+ VMLINUX_SYMBOL(__stop___tracepoint_str) = .;
#else
#define TRACE_PRINTKS()
+#define TRACEPOINT_STR()
#endif
#ifdef CONFIG_FTRACE_SYSCALLS
@@ -190,7 +194,8 @@
VMLINUX_SYMBOL(__stop___verbose) = .; \
LIKELY_PROFILE() \
BRANCH_PROFILE() \
- TRACE_PRINTKS()
+ TRACE_PRINTKS() \
+ TRACEPOINT_STR()
/*
* Data section helpers
diff --git a/include/linux/debugobjects.h b/include/linux/debugobjects.h
index 0e5f5785d9f2..98ffcbd4888e 100644
--- a/include/linux/debugobjects.h
+++ b/include/linux/debugobjects.h
@@ -63,7 +63,7 @@ struct debug_obj_descr {
extern void debug_object_init (void *addr, struct debug_obj_descr *descr);
extern void
debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr);
-extern void debug_object_activate (void *addr, struct debug_obj_descr *descr);
+extern int debug_object_activate (void *addr, struct debug_obj_descr *descr);
extern void debug_object_deactivate(void *addr, struct debug_obj_descr *descr);
extern void debug_object_destroy (void *addr, struct debug_obj_descr *descr);
extern void debug_object_free (void *addr, struct debug_obj_descr *descr);
@@ -85,8 +85,8 @@ static inline void
debug_object_init (void *addr, struct debug_obj_descr *descr) { }
static inline void
debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) { }
-static inline void
-debug_object_activate (void *addr, struct debug_obj_descr *descr) { }
+static inline int
+debug_object_activate (void *addr, struct debug_obj_descr *descr) { return 0; }
static inline void
debug_object_deactivate(void *addr, struct debug_obj_descr *descr) { }
static inline void
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index 120d57a1c3a5..5eaa746735ff 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -359,6 +359,40 @@ do { \
__trace_printk(ip, fmt, ##args); \
} while (0)
+/**
+ * tracepoint_string - register constant persistent string to trace system
+ * @str - a constant persistent string that will be referenced in tracepoints
+ *
+ * If constant strings are being used in tracepoints, it is faster and
+ * more efficient to just save the pointer to the string and reference
+ * that with a printf "%s" instead of saving the string in the ring buffer
+ * and wasting space and time.
+ *
+ * The problem with the above approach is that userspace tools that read
+ * the binary output of the trace buffers do not have access to the string.
+ * Instead they just show the address of the string which is not very
+ * useful to users.
+ *
+ * With tracepoint_string(), the string will be registered to the tracing
+ * system and exported to userspace via the debugfs/tracing/printk_formats
+ * file that maps the string address to the string text. This way userspace
+ * tools that read the binary buffers have a way to map the pointers to
+ * the ASCII strings they represent.
+ *
+ * The @str used must be a constant string and persistent as it would not
+ * make sense to show a string that no longer exists. But it is still fine
+ * to be used with modules, because when modules are unloaded, if they
+ * had tracepoints, the ring buffers are cleared too. As long as the string
+ * does not change during the life of the module, it is fine to use
+ * tracepoint_string() within a module.
+ */
+#define tracepoint_string(str) \
+ ({ \
+ static const char *___tp_str __tracepoint_string = str; \
+ ___tp_str; \
+ })
+#define __tracepoint_string __attribute__((section("__tracepoint_str")))
+
#ifdef CONFIG_PERF_EVENTS
struct perf_event;
diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h
index 97ba4e78a37e..d235e88cfd7c 100644
--- a/include/linux/jiffies.h
+++ b/include/linux/jiffies.h
@@ -101,13 +101,13 @@ static inline u64 get_jiffies_64(void)
#define time_after(a,b) \
(typecheck(unsigned long, a) && \
typecheck(unsigned long, b) && \
- ((long)(b) - (long)(a) < 0))
+ ((long)((b) - (a)) < 0))
#define time_before(a,b) time_after(b,a)
#define time_after_eq(a,b) \
(typecheck(unsigned long, a) && \
typecheck(unsigned long, b) && \
- ((long)(a) - (long)(b) >= 0))
+ ((long)((a) - (b)) >= 0))
#define time_before_eq(a,b) time_after_eq(b,a)
/*
@@ -130,13 +130,13 @@ static inline u64 get_jiffies_64(void)
#define time_after64(a,b) \
(typecheck(__u64, a) && \
typecheck(__u64, b) && \
- ((__s64)(b) - (__s64)(a) < 0))
+ ((__s64)((b) - (a)) < 0))
#define time_before64(a,b) time_after64(b,a)
#define time_after_eq64(a,b) \
(typecheck(__u64, a) && \
typecheck(__u64, b) && \
- ((__s64)(a) - (__s64)(b) >= 0))
+ ((__s64)((a) - (b)) >= 0))
#define time_before_eq64(a,b) time_after_eq64(b,a)
#define time_in_range64(a, b, c) \
diff --git a/include/linux/rculist.h b/include/linux/rculist.h
index f4b1001a4676..4106721c4e5e 100644
--- a/include/linux/rculist.h
+++ b/include/linux/rculist.h
@@ -267,8 +267,9 @@ static inline void list_splice_init_rcu(struct list_head *list,
*/
#define list_first_or_null_rcu(ptr, type, member) \
({struct list_head *__ptr = (ptr); \
- struct list_head __rcu *__next = list_next_rcu(__ptr); \
- likely(__ptr != __next) ? container_of(__next, type, member) : NULL; \
+ struct list_head *__next = ACCESS_ONCE(__ptr->next); \
+ likely(__ptr != __next) ? \
+ list_entry_rcu(__next, type, member) : NULL; \
})
/**
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 4b14bdc911d7..f1f1bc39346b 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -52,7 +52,7 @@ extern int rcutorture_runnable; /* for sysctl */
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU)
extern void rcutorture_record_test_transition(void);
extern void rcutorture_record_progress(unsigned long vernum);
-extern void do_trace_rcu_torture_read(char *rcutorturename,
+extern void do_trace_rcu_torture_read(const char *rcutorturename,
struct rcu_head *rhp,
unsigned long secs,
unsigned long c_old,
@@ -65,7 +65,7 @@ static inline void rcutorture_record_progress(unsigned long vernum)
{
}
#ifdef CONFIG_RCU_TRACE
-extern void do_trace_rcu_torture_read(char *rcutorturename,
+extern void do_trace_rcu_torture_read(const char *rcutorturename,
struct rcu_head *rhp,
unsigned long secs,
unsigned long c_old,
@@ -229,13 +229,9 @@ extern void rcu_irq_exit(void);
#ifdef CONFIG_RCU_USER_QS
extern void rcu_user_enter(void);
extern void rcu_user_exit(void);
-extern void rcu_user_enter_after_irq(void);
-extern void rcu_user_exit_after_irq(void);
#else
static inline void rcu_user_enter(void) { }
static inline void rcu_user_exit(void) { }
-static inline void rcu_user_enter_after_irq(void) { }
-static inline void rcu_user_exit_after_irq(void) { }
static inline void rcu_user_hooks_switch(struct task_struct *prev,
struct task_struct *next) { }
#endif /* CONFIG_RCU_USER_QS */
@@ -1015,4 +1011,22 @@ static inline bool rcu_is_nocb_cpu(int cpu) { return false; }
#endif /* #else #ifdef CONFIG_RCU_NOCB_CPU */
+/* Only for use by adaptive-ticks code. */
+#ifdef CONFIG_NO_HZ_FULL_SYSIDLE
+extern bool rcu_sys_is_idle(void);
+extern void rcu_sysidle_force_exit(void);
+#else /* #ifdef CONFIG_NO_HZ_FULL_SYSIDLE */
+
+static inline bool rcu_sys_is_idle(void)
+{
+ return false;
+}
+
+static inline void rcu_sysidle_force_exit(void)
+{
+}
+
+#endif /* #else #ifdef CONFIG_NO_HZ_FULL_SYSIDLE */
+
+
#endif /* __LINUX_RCUPDATE_H */
diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h
index 59ebcc89f148..ee2376cfaab3 100644
--- a/include/trace/events/rcu.h
+++ b/include/trace/events/rcu.h
@@ -19,12 +19,12 @@
*/
TRACE_EVENT(rcu_utilization,
- TP_PROTO(char *s),
+ TP_PROTO(const char *s),
TP_ARGS(s),
TP_STRUCT__entry(
- __field(char *, s)
+ __field(const char *, s)
),
TP_fast_assign(
@@ -51,14 +51,14 @@ TRACE_EVENT(rcu_utilization,
*/
TRACE_EVENT(rcu_grace_period,
- TP_PROTO(char *rcuname, unsigned long gpnum, char *gpevent),
+ TP_PROTO(const char *rcuname, unsigned long gpnum, const char *gpevent),
TP_ARGS(rcuname, gpnum, gpevent),
TP_STRUCT__entry(
- __field(char *, rcuname)
+ __field(const char *, rcuname)
__field(unsigned long, gpnum)
- __field(char *, gpevent)
+ __field(const char *, gpevent)
),
TP_fast_assign(
@@ -89,21 +89,21 @@ TRACE_EVENT(rcu_grace_period,
*/
TRACE_EVENT(rcu_future_grace_period,
- TP_PROTO(char *rcuname, unsigned long gpnum, unsigned long completed,
+ TP_PROTO(const char *rcuname, unsigned long gpnum, unsigned long completed,
unsigned long c, u8 level, int grplo, int grphi,
- char *gpevent),
+ const char *gpevent),
TP_ARGS(rcuname, gpnum, completed, c, level, grplo, grphi, gpevent),
TP_STRUCT__entry(
- __field(char *, rcuname)
+ __field(const char *, rcuname)
__field(unsigned long, gpnum)
__field(unsigned long, completed)
__field(unsigned long, c)
__field(u8, level)
__field(int, grplo)
__field(int, grphi)
- __field(char *, gpevent)
+ __field(const char *, gpevent)
),
TP_fast_assign(
@@ -132,13 +132,13 @@ TRACE_EVENT(rcu_future_grace_period,
*/
TRACE_EVENT(rcu_grace_period_init,
- TP_PROTO(char *rcuname, unsigned long gpnum, u8 level,
+ TP_PROTO(const char *rcuname, unsigned long gpnum, u8 level,
int grplo, int grphi, unsigned long qsmask),
TP_ARGS(rcuname, gpnum, level, grplo, grphi, qsmask),
TP_STRUCT__entry(
- __field(char *, rcuname)
+ __field(const char *, rcuname)
__field(unsigned long, gpnum)
__field(u8, level)
__field(int, grplo)
@@ -168,12 +168,12 @@ TRACE_EVENT(rcu_grace_period_init,
*/
TRACE_EVENT(rcu_preempt_task,
- TP_PROTO(char *rcuname, int pid, unsigned long gpnum),
+ TP_PROTO(const char *rcuname, int pid, unsigned long gpnum),
TP_ARGS(rcuname, pid, gpnum),
TP_STRUCT__entry(
- __field(char *, rcuname)
+ __field(const char *, rcuname)
__field(unsigned long, gpnum)
__field(int, pid)
),
@@ -195,12 +195,12 @@ TRACE_EVENT(rcu_preempt_task,
*/
TRACE_EVENT(rcu_unlock_preempted_task,
- TP_PROTO(char *rcuname, unsigned long gpnum, int pid),
+ TP_PROTO(const char *rcuname, unsigned long gpnum, int pid),
TP_ARGS(rcuname, gpnum, pid),
TP_STRUCT__entry(
- __field(char *, rcuname)
+ __field(const char *, rcuname)
__field(unsigned long, gpnum)
__field(int, pid)
),
@@ -224,14 +224,14 @@ TRACE_EVENT(rcu_unlock_preempted_task,
*/
TRACE_EVENT(rcu_quiescent_state_report,
- TP_PROTO(char *rcuname, unsigned long gpnum,
+ TP_PROTO(const char *rcuname, unsigned long gpnum,
unsigned long mask, unsigned long qsmask,
u8 level, int grplo, int grphi, int gp_tasks),
TP_ARGS(rcuname, gpnum, mask, qsmask, level, grplo, grphi, gp_tasks),
TP_STRUCT__entry(
- __field(char *, rcuname)
+ __field(const char *, rcuname)
__field(unsigned long, gpnum)
__field(unsigned long, mask)
__field(unsigned long, qsmask)
@@ -268,15 +268,15 @@ TRACE_EVENT(rcu_quiescent_state_report,
*/
TRACE_EVENT(rcu_fqs,
- TP_PROTO(char *rcuname, unsigned long gpnum, int cpu, char *qsevent),
+ TP_PROTO(const char *rcuname, unsigned long gpnum, int cpu, const char *qsevent),
TP_ARGS(rcuname, gpnum, cpu, qsevent),
TP_STRUCT__entry(
- __field(char *, rcuname)
+ __field(const char *, rcuname)
__field(unsigned long, gpnum)
__field(int, cpu)
- __field(char *, qsevent)
+ __field(const char *, qsevent)
),
TP_fast_assign(
@@ -308,12 +308,12 @@ TRACE_EVENT(rcu_fqs,
*/
TRACE_EVENT(rcu_dyntick,
- TP_PROTO(char *polarity, long long oldnesting, long long newnesting),
+ TP_PROTO(const char *polarity, long long oldnesting, long long newnesting),
TP_ARGS(polarity, oldnesting, newnesting),
TP_STRUCT__entry(
- __field(char *, polarity)
+ __field(const char *, polarity)
__field(long long, oldnesting)
__field(long long, newnesting)
),
@@ -352,12 +352,12 @@ TRACE_EVENT(rcu_dyntick,
*/
TRACE_EVENT(rcu_prep_idle,
- TP_PROTO(char *reason),
+ TP_PROTO(const char *reason),
TP_ARGS(reason),
TP_STRUCT__entry(
- __field(char *, reason)
+ __field(const char *, reason)
),
TP_fast_assign(
@@ -376,13 +376,13 @@ TRACE_EVENT(rcu_prep_idle,
*/
TRACE_EVENT(rcu_callback,
- TP_PROTO(char *rcuname, struct rcu_head *rhp, long qlen_lazy,
+ TP_PROTO(const char *rcuname, struct rcu_head *rhp, long qlen_lazy,
long qlen),
TP_ARGS(rcuname, rhp, qlen_lazy, qlen),
TP_STRUCT__entry(
- __field(char *, rcuname)
+ __field(const char *, rcuname)
__field(void *, rhp)
__field(void *, func)
__field(long, qlen_lazy)
@@ -412,13 +412,13 @@ TRACE_EVENT(rcu_callback,
*/
TRACE_EVENT(rcu_kfree_callback,
- TP_PROTO(char *rcuname, struct rcu_head *rhp, unsigned long offset,
+ TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset,
long qlen_lazy, long qlen),
TP_ARGS(rcuname, rhp, offset, qlen_lazy, qlen),
TP_STRUCT__entry(
- __field(char *, rcuname)
+ __field(const char *, rcuname)
__field(void *, rhp)
__field(unsigned long, offset)
__field(long, qlen_lazy)
@@ -447,12 +447,12 @@ TRACE_EVENT(rcu_kfree_callback,
*/
TRACE_EVENT(rcu_batch_start,
- TP_PROTO(char *rcuname, long qlen_lazy, long qlen, long blimit),
+ TP_PROTO(const char *rcuname, long qlen_lazy, long qlen, long blimit),
TP_ARGS(rcuname, qlen_lazy, qlen, blimit),
TP_STRUCT__entry(
- __field(char *, rcuname)
+ __field(const char *, rcuname)
__field(long, qlen_lazy)
__field(long, qlen)
__field(long, blimit)
@@ -477,12 +477,12 @@ TRACE_EVENT(rcu_batch_start,
*/
TRACE_EVENT(rcu_invoke_callback,
- TP_PROTO(char *rcuname, struct rcu_head *rhp),
+ TP_PROTO(const char *rcuname, struct rcu_head *rhp),
TP_ARGS(rcuname, rhp),
TP_STRUCT__entry(
- __field(char *, rcuname)
+ __field(const char *, rcuname)
__field(void *, rhp)
__field(void *, func)
),
@@ -506,12 +506,12 @@ TRACE_EVENT(rcu_invoke_callback,
*/
TRACE_EVENT(rcu_invoke_kfree_callback,
- TP_PROTO(char *rcuname, struct rcu_head *rhp, unsigned long offset),
+ TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset),
TP_ARGS(rcuname, rhp, offset),
TP_STRUCT__entry(
- __field(char *, rcuname)
+ __field(const char *, rcuname)
__field(void *, rhp)
__field(unsigned long, offset)
),
@@ -539,13 +539,13 @@ TRACE_EVENT(rcu_invoke_kfree_callback,
*/
TRACE_EVENT(rcu_batch_end,
- TP_PROTO(char *rcuname, int callbacks_invoked,
+ TP_PROTO(const char *rcuname, int callbacks_invoked,
bool cb, bool nr, bool iit, bool risk),
TP_ARGS(rcuname, callbacks_invoked, cb, nr, iit, risk),
TP_STRUCT__entry(
- __field(char *, rcuname)
+ __field(const char *, rcuname)
__field(int, callbacks_invoked)
__field(bool, cb)
__field(bool, nr)
@@ -577,13 +577,13 @@ TRACE_EVENT(rcu_batch_end,
*/
TRACE_EVENT(rcu_torture_read,
- TP_PROTO(char *rcutorturename, struct rcu_head *rhp,
+ TP_PROTO(const char *rcutorturename, struct rcu_head *rhp,
unsigned long secs, unsigned long c_old, unsigned long c),
TP_ARGS(rcutorturename, rhp, secs, c_old, c),
TP_STRUCT__entry(
- __field(char *, rcutorturename)
+ __field(const char *, rcutorturename)
__field(struct rcu_head *, rhp)
__field(unsigned long, secs)
__field(unsigned long, c_old)
@@ -623,13 +623,13 @@ TRACE_EVENT(rcu_torture_read,
*/
TRACE_EVENT(rcu_barrier,
- TP_PROTO(char *rcuname, char *s, int cpu, int cnt, unsigned long done),
+ TP_PROTO(const char *rcuname, const char *s, int cpu, int cnt, unsigned long done),
TP_ARGS(rcuname, s, cpu, cnt, done),
TP_STRUCT__entry(
- __field(char *, rcuname)
- __field(char *, s)
+ __field(const char *, rcuname)
+ __field(const char *, s)
__field(int, cpu)
__field(int, cnt)
__field(unsigned long, done)