diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/clocksource.h | 7 | ||||
| -rw-r--r-- | include/linux/ftrace_event.h | 2 | ||||
| -rw-r--r-- | include/linux/genhd.h | 1 | ||||
| -rw-r--r-- | include/linux/init_task.h | 2 | ||||
| -rw-r--r-- | include/linux/iocontext.h | 10 | ||||
| -rw-r--r-- | include/linux/kernel.h | 28 | ||||
| -rw-r--r-- | include/linux/math64.h | 4 | ||||
| -rw-r--r-- | include/linux/preempt.h | 5 | ||||
| -rw-r--r-- | include/linux/printk.h | 10 | ||||
| -rw-r--r-- | include/linux/rcupdate.h | 83 | ||||
| -rw-r--r-- | include/linux/rcutiny.h | 10 | ||||
| -rw-r--r-- | include/linux/rcutree.h | 19 | ||||
| -rw-r--r-- | include/linux/ring_buffer.h | 3 | ||||
| -rw-r--r-- | include/linux/sched.h | 54 | ||||
| -rw-r--r-- | include/linux/srcu.h | 15 | ||||
| -rw-r--r-- | include/linux/timex.h | 17 | ||||
| -rw-r--r-- | include/linux/wait.h | 5 | ||||
| -rw-r--r-- | include/linux/workqueue.h | 4 | ||||
| -rw-r--r-- | include/trace/events/rcu.h | 63 |
19 files changed, 257 insertions, 85 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h index 081147da0564..fbe89e17124e 100644 --- a/include/linux/clocksource.h +++ b/include/linux/clocksource.h @@ -319,13 +319,6 @@ static inline void __clocksource_updatefreq_khz(struct clocksource *cs, u32 khz) __clocksource_updatefreq_scale(cs, 1000, khz); } -static inline void -clocksource_calc_mult_shift(struct clocksource *cs, u32 freq, u32 minsec) -{ - return clocks_calc_mult_shift(&cs->mult, &cs->shift, freq, - NSEC_PER_SEC, minsec); -} - #ifdef CONFIG_GENERIC_TIME_VSYSCALL extern void update_vsyscall(struct timespec *ts, struct timespec *wtm, diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h index dd478fc8f9f5..5f3f3be5af09 100644 --- a/include/linux/ftrace_event.h +++ b/include/linux/ftrace_event.h @@ -144,12 +144,14 @@ struct event_filter; enum trace_reg { TRACE_REG_REGISTER, TRACE_REG_UNREGISTER, +#ifdef CONFIG_PERF_EVENTS TRACE_REG_PERF_REGISTER, TRACE_REG_PERF_UNREGISTER, TRACE_REG_PERF_OPEN, TRACE_REG_PERF_CLOSE, TRACE_REG_PERF_ADD, TRACE_REG_PERF_DEL, +#endif }; struct ftrace_event_call; diff --git a/include/linux/genhd.h b/include/linux/genhd.h index fe23ee768589..e61d3192448e 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -596,6 +596,7 @@ extern char *disk_name (struct gendisk *hd, int partno, char *buf); extern int disk_expand_part_tbl(struct gendisk *disk, int target); extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev); +extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev); extern struct hd_struct * __must_check add_partition(struct gendisk *disk, int partno, sector_t start, sector_t len, int flags, diff --git a/include/linux/init_task.h b/include/linux/init_task.h index 9c66b1ada9d7..f994d51f70f2 100644 --- a/include/linux/init_task.h +++ b/include/linux/init_task.h @@ -149,7 +149,7 @@ extern struct cred init_cred; }, \ .rt = { \ .run_list = LIST_HEAD_INIT(tsk.rt.run_list), \ - .time_slice = HZ, \ + .time_slice = RR_TIMESLICE, \ .nr_cpus_allowed = NR_CPUS, \ }, \ .tasks = LIST_HEAD_INIT(tsk.tasks), \ diff --git a/include/linux/iocontext.h b/include/linux/iocontext.h index 119773eebe31..1a3018063034 100644 --- a/include/linux/iocontext.h +++ b/include/linux/iocontext.h @@ -6,8 +6,11 @@ #include <linux/workqueue.h> enum { - ICQ_IOPRIO_CHANGED, - ICQ_CGROUP_CHANGED, + ICQ_IOPRIO_CHANGED = 1 << 0, + ICQ_CGROUP_CHANGED = 1 << 1, + ICQ_EXITED = 1 << 2, + + ICQ_CHANGED_MASK = ICQ_IOPRIO_CHANGED | ICQ_CGROUP_CHANGED, }; /* @@ -88,7 +91,7 @@ struct io_cq { struct rcu_head __rcu_head; }; - unsigned long changed; + unsigned int flags; }; /* @@ -139,6 +142,7 @@ struct io_context *get_task_io_context(struct task_struct *task, gfp_t gfp_flags, int node); void ioc_ioprio_changed(struct io_context *ioc, int ioprio); void ioc_cgroup_changed(struct io_context *ioc); +unsigned int icq_get_changed(struct io_cq *icq); #else struct io_context; static inline void put_io_context(struct io_context *ioc) { } diff --git a/include/linux/kernel.h b/include/linux/kernel.h index e8343422240a..5582c7985567 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -85,6 +85,19 @@ } \ ) +/* + * Multiplies an integer by a fraction, while avoiding unnecessary + * overflow or loss of precision. + */ +#define mult_frac(x, numer, denom)( \ +{ \ + typeof(x) quot = (x) / (denom); \ + typeof(x) rem = (x) % (denom); \ + (quot * (numer)) + ((rem * (numer)) / (denom)); \ +} \ +) + + #define _RET_IP_ (unsigned long)__builtin_return_address(0) #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) @@ -414,16 +427,10 @@ extern int __must_check hex2bin(u8 *dst, const char *src, size_t count); * Most likely, you want to use tracing_on/tracing_off. */ #ifdef CONFIG_RING_BUFFER -void tracing_on(void); -void tracing_off(void); /* trace_off_permanent stops recording with no way to bring it back */ void tracing_off_permanent(void); -int tracing_is_on(void); #else -static inline void tracing_on(void) { } -static inline void tracing_off(void) { } static inline void tracing_off_permanent(void) { } -static inline int tracing_is_on(void) { return 0; } #endif enum ftrace_dump_mode { @@ -433,6 +440,10 @@ enum ftrace_dump_mode { }; #ifdef CONFIG_TRACING +void tracing_on(void); +void tracing_off(void); +int tracing_is_on(void); + extern void tracing_start(void); extern void tracing_stop(void); extern void ftrace_off_permanent(void); @@ -517,6 +528,11 @@ static inline void tracing_start(void) { } static inline void tracing_stop(void) { } static inline void ftrace_off_permanent(void) { } static inline void trace_dump_stack(void) { } + +static inline void tracing_on(void) { } +static inline void tracing_off(void) { } +static inline int tracing_is_on(void) { return 0; } + static inline int trace_printk(const char *fmt, ...) { diff --git a/include/linux/math64.h b/include/linux/math64.h index 23fcdfcba81b..b8ba85544721 100644 --- a/include/linux/math64.h +++ b/include/linux/math64.h @@ -6,6 +6,8 @@ #if BITS_PER_LONG == 64 +#define div64_long(x,y) div64_s64((x),(y)) + /** * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder * @@ -45,6 +47,8 @@ static inline s64 div64_s64(s64 dividend, s64 divisor) #elif BITS_PER_LONG == 32 +#define div64_long(x,y) div_s64((x),(y)) + #ifndef div_u64_rem static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder) { diff --git a/include/linux/preempt.h b/include/linux/preempt.h index 58969b2a8a82..5a710b9c578e 100644 --- a/include/linux/preempt.h +++ b/include/linux/preempt.h @@ -48,12 +48,14 @@ do { \ barrier(); \ } while (0) -#define preempt_enable_no_resched() \ +#define sched_preempt_enable_no_resched() \ do { \ barrier(); \ dec_preempt_count(); \ } while (0) +#define preempt_enable_no_resched() sched_preempt_enable_no_resched() + #define preempt_enable() \ do { \ preempt_enable_no_resched(); \ @@ -92,6 +94,7 @@ do { \ #else /* !CONFIG_PREEMPT_COUNT */ #define preempt_disable() do { } while (0) +#define sched_preempt_enable_no_resched() do { } while (0) #define preempt_enable_no_resched() do { } while (0) #define preempt_enable() do { } while (0) diff --git a/include/linux/printk.h b/include/linux/printk.h index f0e22f75143f..1f77a4174ee0 100644 --- a/include/linux/printk.h +++ b/include/linux/printk.h @@ -101,6 +101,11 @@ asmlinkage __printf(1, 2) __cold int printk(const char *fmt, ...); /* + * Special printk facility for scheduler use only, _DO_NOT_USE_ ! + */ +__printf(1, 2) __cold int printk_sched(const char *fmt, ...); + +/* * Please don't use printk_ratelimit(), because it shares ratelimiting state * with all other unrelated printk_ratelimit() callsites. Instead use * printk_ratelimited() or plain old __ratelimit(). @@ -127,6 +132,11 @@ int printk(const char *s, ...) { return 0; } +static inline __printf(1, 2) __cold +int printk_sched(const char *s, ...) +{ + return 0; +} static inline int printk_ratelimit(void) { return 0; diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index 81c04f4348ec..937217425c47 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -190,6 +190,33 @@ extern void rcu_idle_exit(void); extern void rcu_irq_enter(void); extern void rcu_irq_exit(void); +/** + * RCU_NONIDLE - Indicate idle-loop code that needs RCU readers + * @a: Code that RCU needs to pay attention to. + * + * RCU, RCU-bh, and RCU-sched read-side critical sections are forbidden + * in the inner idle loop, that is, between the rcu_idle_enter() and + * the rcu_idle_exit() -- RCU will happily ignore any such read-side + * critical sections. However, things like powertop need tracepoints + * in the inner idle loop. + * + * This macro provides the way out: RCU_NONIDLE(do_something_with_RCU()) + * will tell RCU that it needs to pay attending, invoke its argument + * (in this example, a call to the do_something_with_RCU() function), + * and then tell RCU to go back to ignoring this CPU. It is permissible + * to nest RCU_NONIDLE() wrappers, but the nesting level is currently + * quite limited. If deeper nesting is required, it will be necessary + * to adjust DYNTICK_TASK_NESTING_VALUE accordingly. + * + * This macro may be used from process-level code only. + */ +#define RCU_NONIDLE(a) \ + do { \ + rcu_idle_exit(); \ + do { a; } while (0); \ + rcu_idle_enter(); \ + } while (0) + /* * Infrastructure to implement the synchronize_() primitives in * TREE_RCU and rcu_barrier_() primitives in TINY_RCU. @@ -226,6 +253,15 @@ static inline void destroy_rcu_head_on_stack(struct rcu_head *head) } #endif /* #else !CONFIG_DEBUG_OBJECTS_RCU_HEAD */ +#if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PROVE_RCU) +bool rcu_lockdep_current_cpu_online(void); +#else /* #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PROVE_RCU) */ +static inline bool rcu_lockdep_current_cpu_online(void) +{ + return 1; +} +#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PROVE_RCU) */ + #ifdef CONFIG_DEBUG_LOCK_ALLOC #ifdef CONFIG_PROVE_RCU @@ -239,13 +275,11 @@ static inline int rcu_is_cpu_idle(void) static inline void rcu_lock_acquire(struct lockdep_map *map) { - WARN_ON_ONCE(rcu_is_cpu_idle()); lock_acquire(map, 0, 0, 2, 1, NULL, _THIS_IP_); } static inline void rcu_lock_release(struct lockdep_map *map) { - WARN_ON_ONCE(rcu_is_cpu_idle()); lock_release(map, 1, _THIS_IP_); } @@ -270,6 +304,9 @@ extern int debug_lockdep_rcu_enabled(void); * occur in the same context, for example, it is illegal to invoke * rcu_read_unlock() in process context if the matching rcu_read_lock() * was invoked from within an irq handler. + * + * Note that rcu_read_lock() is disallowed if the CPU is either idle or + * offline from an RCU perspective, so check for those as well. */ static inline int rcu_read_lock_held(void) { @@ -277,6 +314,8 @@ static inline int rcu_read_lock_held(void) return 1; if (rcu_is_cpu_idle()) return 0; + if (!rcu_lockdep_current_cpu_online()) + return 0; return lock_is_held(&rcu_lock_map); } @@ -313,6 +352,9 @@ extern int rcu_read_lock_bh_held(void); * notice an extended quiescent state to other CPUs that started a grace * period. Otherwise we would delay any grace period as long as we run in * the idle task. + * + * Similarly, we avoid claiming an SRCU read lock held if the current + * CPU is offline. */ #ifdef CONFIG_PREEMPT_COUNT static inline int rcu_read_lock_sched_held(void) @@ -323,6 +365,8 @@ static inline int rcu_read_lock_sched_held(void) return 1; if (rcu_is_cpu_idle()) return 0; + if (!rcu_lockdep_current_cpu_online()) + return 0; if (debug_locks) lockdep_opinion = lock_is_held(&rcu_sched_lock_map); return lockdep_opinion || preempt_count() != 0 || irqs_disabled(); @@ -381,8 +425,22 @@ extern int rcu_my_thread_group_empty(void); } \ } while (0) +#if defined(CONFIG_PROVE_RCU) && !defined(CONFIG_PREEMPT_RCU) +static inline void rcu_preempt_sleep_check(void) +{ + rcu_lockdep_assert(!lock_is_held(&rcu_lock_map), + "Illegal context switch in RCU read-side " + "critical section"); +} +#else /* #ifdef CONFIG_PROVE_RCU */ +static inline void rcu_preempt_sleep_check(void) +{ +} +#endif /* #else #ifdef CONFIG_PROVE_RCU */ + #define rcu_sleep_check() \ do { \ + rcu_preempt_sleep_check(); \ rcu_lockdep_assert(!lock_is_held(&rcu_bh_lock_map), \ "Illegal context switch in RCU-bh" \ " read-side critical section"); \ @@ -470,6 +528,13 @@ extern int rcu_my_thread_group_empty(void); * NULL. Although rcu_access_pointer() may also be used in cases where * update-side locks prevent the value of the pointer from changing, you * should instead use rcu_dereference_protected() for this use case. + * + * It is also permissible to use rcu_access_pointer() when read-side + * access to the pointer was removed at least one grace period ago, as + * is the case in the context of the RCU callback that is freeing up + * the data, or after a synchronize_rcu() returns. This can be useful + * when tearing down multi-linked structures after a grace period + * has elapsed. */ #define rcu_access_pointer(p) __rcu_access_pointer((p), __rcu) @@ -659,6 +724,8 @@ static inline void rcu_read_lock(void) __rcu_read_lock(); __acquire(RCU); rcu_lock_acquire(&rcu_lock_map); + rcu_lockdep_assert(!rcu_is_cpu_idle(), + "rcu_read_lock() used illegally while idle"); } /* @@ -678,6 +745,8 @@ static inline void rcu_read_lock(void) */ static inline void rcu_read_unlock(void) { + rcu_lockdep_assert(!rcu_is_cpu_idle(), + "rcu_read_unlock() used illegally while idle"); rcu_lock_release(&rcu_lock_map); __release(RCU); __rcu_read_unlock(); @@ -705,6 +774,8 @@ 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_cpu_idle(), + "rcu_read_lock_bh() used illegally while idle"); } /* @@ -714,6 +785,8 @@ static inline void rcu_read_lock_bh(void) */ static inline void rcu_read_unlock_bh(void) { + rcu_lockdep_assert(!rcu_is_cpu_idle(), + "rcu_read_unlock_bh() used illegally while idle"); rcu_lock_release(&rcu_bh_lock_map); __release(RCU_BH); local_bh_enable(); @@ -737,6 +810,8 @@ static inline void rcu_read_lock_sched(void) preempt_disable(); __acquire(RCU_SCHED); rcu_lock_acquire(&rcu_sched_lock_map); + rcu_lockdep_assert(!rcu_is_cpu_idle(), + "rcu_read_lock_sched() used illegally while idle"); } /* Used by lockdep and tracing: cannot be traced, cannot call lockdep. */ @@ -753,6 +828,8 @@ static inline notrace void rcu_read_lock_sched_notrace(void) */ static inline void rcu_read_unlock_sched(void) { + rcu_lockdep_assert(!rcu_is_cpu_idle(), + "rcu_read_unlock_sched() used illegally while idle"); rcu_lock_release(&rcu_sched_lock_map); __release(RCU_SCHED); preempt_enable(); @@ -841,7 +918,7 @@ void __kfree_rcu(struct rcu_head *head, unsigned long offset) /* See the kfree_rcu() header comment. */ BUILD_BUG_ON(!__is_kfree_rcu_offset(offset)); - call_rcu(head, (rcu_callback)offset); + kfree_call_rcu(head, (rcu_callback)offset); } /** diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h index 00b7a5e493d2..e93df77176d1 100644 --- a/include/linux/rcutiny.h +++ b/include/linux/rcutiny.h @@ -27,13 +27,9 @@ #include <linux/cache.h> -#ifdef CONFIG_RCU_BOOST static inline void rcu_init(void) { } -#else /* #ifdef CONFIG_RCU_BOOST */ -void rcu_init(void); -#endif /* #else #ifdef CONFIG_RCU_BOOST */ static inline void rcu_barrier_bh(void) { @@ -83,6 +79,12 @@ static inline void synchronize_sched_expedited(void) synchronize_sched(); } +static inline void kfree_call_rcu(struct rcu_head *head, + void (*func)(struct rcu_head *rcu)) +{ + call_rcu(head, func); +} + #ifdef CONFIG_TINY_RCU static inline void rcu_preempt_note_context_switch(void) diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h index 67458468f1a8..e8ee5dd0854c 100644 --- a/include/linux/rcutree.h +++ b/include/linux/rcutree.h @@ -61,6 +61,24 @@ extern void synchronize_rcu_bh(void); extern void synchronize_sched_expedited(void); extern void synchronize_rcu_expedited(void); +void kfree_call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu)); + +/** + * synchronize_rcu_bh_expedited - Brute-force RCU-bh grace period + * + * Wait for an RCU-bh grace period to elapse, but use a "big hammer" + * approach to force the grace period to end quickly. This consumes + * significant time on all CPUs and is unfriendly to real-time workloads, + * so is thus not recommended for any sort of common-case code. In fact, + * if you are using synchronize_rcu_bh_expedited() in a loop, please + * restructure your code to batch your updates, and then use a single + * synchronize_rcu_bh() instead. + * + * Note that it is illegal to call this function while holding any lock + * that is acquired by a CPU-hotplug notifier. And yes, it is also illegal + * to call this function from a CPU-hotplug notifier. Failing to observe + * these restriction will result in deadlock. + */ static inline void synchronize_rcu_bh_expedited(void) { synchronize_sched_expedited(); @@ -83,6 +101,7 @@ extern void rcu_sched_force_quiescent_state(void); /* A context switch is a grace period for RCU-sched and RCU-bh. */ static inline int rcu_blocking_is_gp(void) { + might_sleep(); /* Check for RCU read-side critical section. */ return num_online_cpus() == 1; } diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h index 67be0376d8e3..7be2e88f23fd 100644 --- a/include/linux/ring_buffer.h +++ b/include/linux/ring_buffer.h @@ -151,6 +151,9 @@ int ring_buffer_empty_cpu(struct ring_buffer *buffer, int cpu); void ring_buffer_record_disable(struct ring_buffer *buffer); void ring_buffer_record_enable(struct ring_buffer *buffer); +void ring_buffer_record_off(struct ring_buffer *buffer); +void ring_buffer_record_on(struct ring_buffer *buffer); +int ring_buffer_record_is_on(struct ring_buffer *buffer); void ring_buffer_record_disable_cpu(struct ring_buffer *buffer, int cpu); void ring_buffer_record_enable_cpu(struct ring_buffer *buffer, int cpu); diff --git a/include/linux/sched.h b/include/linux/sched.h index 0657368bd78f..e074e1e54f85 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -361,6 +361,7 @@ extern signed long schedule_timeout_interruptible(signed long timeout); extern signed long schedule_timeout_killable(signed long timeout); extern signed long schedule_timeout_uninterruptible(signed long timeout); asmlinkage void schedule(void); +extern void schedule_preempt_disabled(void); extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner); struct nsproxy; @@ -905,6 +906,7 @@ struct sched_group_power { * single CPU. */ unsigned int power, power_orig; + unsigned long next_update; /* * Number of busy cpus in this group. */ @@ -1052,6 +1054,8 @@ static inline int test_sd_parent(struct sched_domain *sd, int flag) unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu); unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); +bool cpus_share_cache(int this_cpu, int that_cpu); + #else /* CONFIG_SMP */ struct sched_domain_attr; @@ -1061,6 +1065,12 @@ partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], struct sched_domain_attr *dattr_new) { } + +static inline bool cpus_share_cache(int this_cpu, int that_cpu) +{ + return true; +} + #endif /* !CONFIG_SMP */ @@ -1225,6 +1235,12 @@ struct sched_rt_entity { #endif }; +/* + * default timeslice is 100 msecs (used only for SCHED_RR tasks). + * Timeslices get refilled after they expire. + */ +#define RR_TIMESLICE (100 * HZ / 1000) + struct rcu_node; enum perf_event_task_context { @@ -1319,6 +1335,11 @@ struct task_struct { unsigned sched_reset_on_fork:1; unsigned sched_contributes_to_load:1; +#ifdef CONFIG_GENERIC_HARDIRQS + /* IRQ handler threads */ + unsigned irq_thread:1; +#endif + pid_t pid; pid_t tgid; @@ -1427,11 +1448,6 @@ struct task_struct { * mempolicy */ spinlock_t alloc_lock; -#ifdef CONFIG_GENERIC_HARDIRQS - /* IRQ handler threads */ - struct irqaction *irqaction; -#endif - /* Protection of the PI data structures: */ raw_spinlock_t pi_lock; @@ -1863,8 +1879,7 @@ extern void task_clear_jobctl_pending(struct task_struct *task, #ifdef CONFIG_PREEMPT_RCU #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ -#define RCU_READ_UNLOCK_BOOSTED (1 << 1) /* boosted while in RCU read-side. */ -#define RCU_READ_UNLOCK_NEED_QS (1 << 2) /* RCU core needs CPU response. */ +#define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */ static inline void rcu_copy_process(struct task_struct *p) { @@ -2048,7 +2063,7 @@ extern void sched_autogroup_fork(struct signal_struct *sig); extern void sched_autogroup_exit(struct signal_struct *sig); #ifdef CONFIG_PROC_FS extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); -extern int proc_sched_autogroup_set_nice(struct task_struct *p, int *nice); +extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice); #endif #else static inline void sched_autogroup_create_attach(struct task_struct *p) { } @@ -2065,12 +2080,20 @@ extern unsigned int sysctl_sched_cfs_bandwidth_slice; extern int rt_mutex_getprio(struct task_struct *p); extern void rt_mutex_setprio(struct task_struct *p, int prio); extern void rt_mutex_adjust_pi(struct task_struct *p); +static inline bool tsk_is_pi_blocked(struct task_struct *tsk) +{ + return tsk->pi_blocked_on != NULL; +} #else static inline int rt_mutex_getprio(struct task_struct *p) { return p->normal_prio; } # define rt_mutex_adjust_pi(p) do { } while (0) +static inline bool tsk_is_pi_blocked(struct task_struct *tsk) +{ + return false; +} #endif extern bool yield_to(struct task_struct *p, bool preempt); @@ -2389,12 +2412,15 @@ static inline void task_unlock(struct task_struct *p) extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, unsigned long *flags); -#define lock_task_sighand(tsk, flags) \ -({ struct sighand_struct *__ss; \ - __cond_lock(&(tsk)->sighand->siglock, \ - (__ss = __lock_task_sighand(tsk, flags))); \ - __ss; \ -}) \ +static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk, + unsigned long *flags) +{ + struct sighand_struct *ret; + + ret = __lock_task_sighand(tsk, flags); + (void)__cond_lock(&tsk->sighand->siglock, ret); + return ret; +} static inline void unlock_task_sighand(struct task_struct *tsk, unsigned long *flags) diff --git a/include/linux/srcu.h b/include/linux/srcu.h index e1b005918bbb..d3d5fa54f25e 100644 --- a/include/linux/srcu.h +++ b/include/linux/srcu.h @@ -99,15 +99,18 @@ long srcu_batches_completed(struct srcu_struct *sp); * power mode. This way we can notice an extended quiescent state to * other CPUs that started a grace period. Otherwise we would delay any * grace period as long as we run in the idle task. + * + * Similarly, we avoid claiming an SRCU read lock held if the current + * CPU is offline. */ static inline int srcu_read_lock_held(struct srcu_struct *sp) { - if (rcu_is_cpu_idle()) - return 0; - if (!debug_lockdep_rcu_enabled()) return 1; - + if (rcu_is_cpu_idle()) + return 0; + if (!rcu_lockdep_current_cpu_online()) + return 0; return lock_is_held(&sp->dep_map); } @@ -169,6 +172,8 @@ 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_lockdep_assert(!rcu_is_cpu_idle(), + "srcu_read_lock() used illegally while idle"); return retval; } @@ -182,6 +187,8 @@ 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_lockdep_assert(!rcu_is_cpu_idle(), + "srcu_read_unlock() used illegally while idle"); rcu_lock_release(&(sp)->dep_map); __srcu_read_unlock(sp, idx); } diff --git a/include/linux/timex.h b/include/linux/timex.h index aa60fe7b6ed6..b75e1864ed19 100644 --- a/include/linux/timex.h +++ b/include/linux/timex.h @@ -234,23 +234,9 @@ struct timex { extern unsigned long tick_usec; /* USER_HZ period (usec) */ extern unsigned long tick_nsec; /* ACTHZ period (nsec) */ -/* - * phase-lock loop variables - */ -extern int time_status; /* clock synchronization status bits */ - extern void ntp_init(void); extern void ntp_clear(void); -/** - * ntp_synced - Returns 1 if the NTP status is not UNSYNC - * - */ -static inline int ntp_synced(void) -{ - return !(time_status & STA_UNSYNC); -} - /* Required to safely shift negative values */ #define shift_right(x, s) ({ \ __typeof__(x) __x = (x); \ @@ -264,10 +250,9 @@ static inline int ntp_synced(void) #define NTP_INTERVAL_LENGTH (NSEC_PER_SEC/NTP_INTERVAL_FREQ) /* Returns how long ticks are at present, in ns / 2^NTP_SCALE_SHIFT. */ -extern u64 tick_length; +extern u64 ntp_tick_length(void); extern void second_overflow(void); -extern void update_ntp_one_tick(void); extern int do_adjtimex(struct timex *); extern void hardpps(const struct timespec *, const struct timespec *); diff --git a/include/linux/wait.h b/include/linux/wait.h index a9ce45e8501c..7d9a9e990ce6 100644 --- a/include/linux/wait.h +++ b/include/linux/wait.h @@ -157,7 +157,7 @@ void __wake_up(wait_queue_head_t *q, unsigned int mode, int nr, void *key); void __wake_up_locked_key(wait_queue_head_t *q, unsigned int mode, void *key); void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode, int nr, void *key); -void __wake_up_locked(wait_queue_head_t *q, unsigned int mode); +void __wake_up_locked(wait_queue_head_t *q, unsigned int mode, int nr); void __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr); void __wake_up_bit(wait_queue_head_t *, void *, int); int __wait_on_bit(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned); @@ -170,7 +170,8 @@ wait_queue_head_t *bit_waitqueue(void *, int); #define wake_up(x) __wake_up(x, TASK_NORMAL, 1, NULL) #define wake_up_nr(x, nr) __wake_up(x, TASK_NORMAL, nr, NULL) #define wake_up_all(x) __wake_up(x, TASK_NORMAL, 0, NULL) -#define wake_up_locked(x) __wake_up_locked((x), TASK_NORMAL) +#define wake_up_locked(x) __wake_up_locked((x), TASK_NORMAL, 1) +#define wake_up_all_locked(x) __wake_up_locked((x), TASK_NORMAL, 0) #define wake_up_interruptible(x) __wake_up(x, TASK_INTERRUPTIBLE, 1, NULL) #define wake_up_interruptible_nr(x, nr) __wake_up(x, TASK_INTERRUPTIBLE, nr, NULL) diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h index eb8b9f15f2e0..af155450cabb 100644 --- a/include/linux/workqueue.h +++ b/include/linux/workqueue.h @@ -289,12 +289,16 @@ enum { * * system_freezable_wq is equivalent to system_wq except that it's * freezable. + * + * system_nrt_freezable_wq is equivalent to system_nrt_wq except that + * it's freezable. */ extern struct workqueue_struct *system_wq; extern struct workqueue_struct *system_long_wq; extern struct workqueue_struct *system_nrt_wq; extern struct workqueue_struct *system_unbound_wq; extern struct workqueue_struct *system_freezable_wq; +extern struct workqueue_struct *system_nrt_freezable_wq; extern struct workqueue_struct * __alloc_workqueue_key(const char *fmt, unsigned int flags, int max_active, diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h index d2d88bed891b..337099783f37 100644 --- a/include/trace/events/rcu.h +++ b/include/trace/events/rcu.h @@ -313,19 +313,22 @@ TRACE_EVENT(rcu_prep_idle, /* * Tracepoint for the registration of a single RCU callback function. * The first argument is the type of RCU, the second argument is - * a pointer to the RCU callback itself, and the third element is the - * new RCU callback queue length for the current CPU. + * a pointer to the RCU callback itself, the third element is the + * number of lazy callbacks queued, and the fourth element is the + * total number of callbacks queued. */ TRACE_EVENT(rcu_callback, - TP_PROTO(char *rcuname, struct rcu_head *rhp, long qlen), + TP_PROTO(char *rcuname, struct rcu_head *rhp, long qlen_lazy, + long qlen), - TP_ARGS(rcuname, rhp, qlen), + TP_ARGS(rcuname, rhp, qlen_lazy, qlen), TP_STRUCT__entry( __field(char *, rcuname) __field(void *, rhp) __field(void *, func) + __field(long, qlen_lazy) __field(long, qlen) ), @@ -333,11 +336,13 @@ TRACE_EVENT(rcu_callback, __entry->rcuname = rcuname; __entry->rhp = rhp; __entry->func = rhp->func; + __entry->qlen_lazy = qlen_lazy; __entry->qlen = qlen; ), - TP_printk("%s rhp=%p func=%pf %ld", - __entry->rcuname, __entry->rhp, __entry->func, __entry->qlen) + TP_printk("%s rhp=%p func=%pf %ld/%ld", + __entry->rcuname, __entry->rhp, __entry->func, + __entry->qlen_lazy, __entry->qlen) ); /* @@ -345,20 +350,21 @@ TRACE_EVENT(rcu_callback, * kfree() form. The first argument is the RCU type, the second argument * is a pointer to the RCU callback, the third argument is the offset * of the callback within the enclosing RCU-protected data structure, - * and the fourth argument is the new RCU callback queue length for the - * current CPU. + * the fourth argument is the number of lazy callbacks queued, and the + * fifth argument is the total number of callbacks queued. */ TRACE_EVENT(rcu_kfree_callback, TP_PROTO(char *rcuname, struct rcu_head *rhp, unsigned long offset, - long qlen), + long qlen_lazy, long qlen), - TP_ARGS(rcuname, rhp, offset, qlen), + TP_ARGS(rcuname, rhp, offset, qlen_lazy, qlen), TP_STRUCT__entry( __field(char *, rcuname) __field(void *, rhp) __field(unsigned long, offset) + __field(long, qlen_lazy) __field(long, qlen) ), @@ -366,41 +372,45 @@ TRACE_EVENT(rcu_kfree_callback, __entry->rcuname = rcuname; __entry->rhp = rhp; __entry->offset = offset; + __entry->qlen_lazy = qlen_lazy; __entry->qlen = qlen; ), - TP_printk("%s rhp=%p func=%ld %ld", + TP_printk("%s rhp=%p func=%ld %ld/%ld", __entry->rcuname, __entry->rhp, __entry->offset, - __entry->qlen) + __entry->qlen_lazy, __entry->qlen) ); /* * Tracepoint for marking the beginning rcu_do_batch, performed to start * RCU callback invocation. The first argument is the RCU flavor, - * the second is the total number of callbacks (including those that - * are not yet ready to be invoked), and the third argument is the - * current RCU-callback batch limit. + * the second is the number of lazy callbacks queued, the third is + * the total number of callbacks queued, and the fourth argument is + * the current RCU-callback batch limit. */ TRACE_EVENT(rcu_batch_start, - TP_PROTO(char *rcuname, long qlen, int blimit), + TP_PROTO(char *rcuname, long qlen_lazy, long qlen, int blimit), - TP_ARGS(rcuname, qlen, blimit), + TP_ARGS(rcuname, qlen_lazy, qlen, blimit), TP_STRUCT__entry( __field(char *, rcuname) + __field(long, qlen_lazy) __field(long, qlen) __field(int, blimit) ), TP_fast_assign( __entry->rcuname = rcuname; + __entry->qlen_lazy = qlen_lazy; __entry->qlen = qlen; __entry->blimit = blimit; ), - TP_printk("%s CBs=%ld bl=%d", - __entry->rcuname, __entry->qlen, __entry->blimit) + TP_printk("%s CBs=%ld/%ld bl=%d", + __entry->rcuname, __entry->qlen_lazy, __entry->qlen, + __entry->blimit) ); /* @@ -531,16 +541,21 @@ TRACE_EVENT(rcu_torture_read, #else /* #ifdef CONFIG_RCU_TRACE */ #define trace_rcu_grace_period(rcuname, gpnum, gpevent) do { } while (0) -#define trace_rcu_grace_period_init(rcuname, gpnum, level, grplo, grphi, qsmask) do { } while (0) +#define trace_rcu_grace_period_init(rcuname, gpnum, level, grplo, grphi, \ + qsmask) do { } while (0) #define trace_rcu_preempt_task(rcuname, pid, gpnum) do { } while (0) #define trace_rcu_unlock_preempted_task(rcuname, gpnum, pid) do { } while (0) -#define trace_rcu_quiescent_state_report(rcuname, gpnum, mask, qsmask, level, grplo, grphi, gp_tasks) do { } while (0) +#define trace_rcu_quiescent_state_report(rcuname, gpnum, mask, qsmask, level, \ + grplo, grphi, gp_tasks) do { } \ + while (0) #define trace_rcu_fqs(rcuname, gpnum, cpu, qsevent) do { } while (0) #define trace_rcu_dyntick(polarity, oldnesting, newnesting) do { } while (0) #define trace_rcu_prep_idle(reason) do { } while (0) -#define trace_rcu_callback(rcuname, rhp, qlen) do { } while (0) -#define trace_rcu_kfree_callback(rcuname, rhp, offset, qlen) do { } while (0) -#define trace_rcu_batch_start(rcuname, qlen, blimit) do { } while (0) +#define trace_rcu_callback(rcuname, rhp, qlen_lazy, qlen) do { } while (0) +#define trace_rcu_kfree_callback(rcuname, rhp, offset, qlen_lazy, qlen) \ + do { } while (0) +#define trace_rcu_batch_start(rcuname, qlen_lazy, qlen, blimit) \ + do { } while (0) #define trace_rcu_invoke_callback(rcuname, rhp) do { } while (0) #define trace_rcu_invoke_kfree_callback(rcuname, rhp, offset) do { } while (0) #define trace_rcu_batch_end(rcuname, callbacks_invoked, cb, nr, iit, risk) \ |