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authorLinus Torvalds <torvalds@linux-foundation.org>2017-02-20 10:06:32 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-20 10:06:32 -0800
commit20dcfe1b7df4072a3c13bdb7506f7138125d0099 (patch)
treeb7a206aeb59240622a5f24e2c54f3d98c37caba2 /kernel
parentc9b9f207b90468bf9583f7ed71c15d0142bbf9b1 (diff)
parent336a9cde10d641e70bac67d90ae91b3190c3edca (diff)
downloadlinux-20dcfe1b7df4072a3c13bdb7506f7138125d0099.tar.bz2
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer updates from Thomas Gleixner: "Nothing exciting, just the usual pile of fixes, updates and cleanups: - A bunch of clocksource driver updates - Removal of CONFIG_TIMER_STATS and the related /proc file - More posix timer slim down work - A scalability enhancement in the tick broadcast code - Math cleanups" * 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits) hrtimer: Catch invalid clockids again math64, tile: Fix build failure clocksource/drivers/arm_arch_timer:: Mark cyclecounter __ro_after_init timerfd: Protect the might cancel mechanism proper timer_list: Remove useless cast when printing time: Remove CONFIG_TIMER_STATS clocksource/drivers/arm_arch_timer: Work around Hisilicon erratum 161010101 clocksource/drivers/arm_arch_timer: Introduce generic errata handling infrastructure clocksource/drivers/arm_arch_timer: Remove fsl-a008585 parameter clocksource/drivers/arm_arch_timer: Add dt binding for hisilicon-161010101 erratum clocksource/drivers/ostm: Add renesas-ostm timer driver clocksource/drivers/ostm: Document renesas-ostm timer DT bindings clocksource/drivers/tcb_clksrc: Use 32 bit tcb as sched_clock clocksource/drivers/gemini: Add driver for the Cortina Gemini clocksource: add DT bindings for Cortina Gemini clockevents: Add a clkevt-of mechanism like clksrc-of tick/broadcast: Reduce lock cacheline contention timers: Omit POSIX timer stuff from task_struct when disabled x86/timer: Make delay() work during early bootup delay: Add explanation of udelay() inaccuracy ...
Diffstat (limited to 'kernel')
-rw-r--r--kernel/fork.c10
-rw-r--r--kernel/kthread.c1
-rw-r--r--kernel/sched/rt.c4
-rw-r--r--kernel/sched/stats.h32
-rw-r--r--kernel/time/Makefile1
-rw-r--r--kernel/time/hrtimer.c58
-rw-r--r--kernel/time/tick-broadcast.c15
-rw-r--r--kernel/time/timekeeping.c39
-rw-r--r--kernel/time/timekeeping.h2
-rw-r--r--kernel/time/timer.c48
-rw-r--r--kernel/time/timer_list.c12
-rw-r--r--kernel/time/timer_stats.c425
-rw-r--r--kernel/workqueue.c2
13 files changed, 60 insertions, 589 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 11c5c8ab827c..105c6676d93b 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1304,6 +1304,7 @@ void __cleanup_sighand(struct sighand_struct *sighand)
}
}
+#ifdef CONFIG_POSIX_TIMERS
/*
* Initialize POSIX timer handling for a thread group.
*/
@@ -1322,6 +1323,9 @@ static void posix_cpu_timers_init_group(struct signal_struct *sig)
INIT_LIST_HEAD(&sig->cpu_timers[1]);
INIT_LIST_HEAD(&sig->cpu_timers[2]);
}
+#else
+static inline void posix_cpu_timers_init_group(struct signal_struct *sig) { }
+#endif
static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
{
@@ -1346,11 +1350,11 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
init_waitqueue_head(&sig->wait_chldexit);
sig->curr_target = tsk;
init_sigpending(&sig->shared_pending);
- INIT_LIST_HEAD(&sig->posix_timers);
seqlock_init(&sig->stats_lock);
prev_cputime_init(&sig->prev_cputime);
#ifdef CONFIG_POSIX_TIMERS
+ INIT_LIST_HEAD(&sig->posix_timers);
hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
sig->real_timer.function = it_real_fn;
#endif
@@ -1425,6 +1429,7 @@ static void rt_mutex_init_task(struct task_struct *p)
#endif
}
+#ifdef CONFIG_POSIX_TIMERS
/*
* Initialize POSIX timer handling for a single task.
*/
@@ -1437,6 +1442,9 @@ static void posix_cpu_timers_init(struct task_struct *tsk)
INIT_LIST_HEAD(&tsk->cpu_timers[1]);
INIT_LIST_HEAD(&tsk->cpu_timers[2]);
}
+#else
+static inline void posix_cpu_timers_init(struct task_struct *tsk) { }
+#endif
static inline void
init_task_pid(struct task_struct *task, enum pid_type type, struct pid *pid)
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 2318fba86277..8461a4372e8a 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -850,7 +850,6 @@ void __kthread_queue_delayed_work(struct kthread_worker *worker,
list_add(&work->node, &worker->delayed_work_list);
work->worker = worker;
- timer_stats_timer_set_start_info(&dwork->timer);
timer->expires = jiffies + delay;
add_timer(timer);
}
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 2516b8df6dbb..a688a8206727 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -2246,6 +2246,7 @@ prio_changed_rt(struct rq *rq, struct task_struct *p, int oldprio)
}
}
+#ifdef CONFIG_POSIX_TIMERS
static void watchdog(struct rq *rq, struct task_struct *p)
{
unsigned long soft, hard;
@@ -2267,6 +2268,9 @@ static void watchdog(struct rq *rq, struct task_struct *p)
p->cputime_expires.sched_exp = p->se.sum_exec_runtime;
}
}
+#else
+static inline void watchdog(struct rq *rq, struct task_struct *p) { }
+#endif
static void task_tick_rt(struct rq *rq, struct task_struct *p, int queued)
{
diff --git a/kernel/sched/stats.h b/kernel/sched/stats.h
index 34659a853505..c69a9870ab79 100644
--- a/kernel/sched/stats.h
+++ b/kernel/sched/stats.h
@@ -172,18 +172,19 @@ sched_info_switch(struct rq *rq,
*/
/**
- * cputimer_running - return true if cputimer is running
+ * get_running_cputimer - return &tsk->signal->cputimer if cputimer is running
*
* @tsk: Pointer to target task.
*/
-static inline bool cputimer_running(struct task_struct *tsk)
-
+#ifdef CONFIG_POSIX_TIMERS
+static inline
+struct thread_group_cputimer *get_running_cputimer(struct task_struct *tsk)
{
struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
/* Check if cputimer isn't running. This is accessed without locking. */
if (!READ_ONCE(cputimer->running))
- return false;
+ return NULL;
/*
* After we flush the task's sum_exec_runtime to sig->sum_sched_runtime
@@ -200,10 +201,17 @@ static inline bool cputimer_running(struct task_struct *tsk)
* clock delta is behind the expiring timer value.
*/
if (unlikely(!tsk->sighand))
- return false;
+ return NULL;
- return true;
+ return cputimer;
+}
+#else
+static inline
+struct thread_group_cputimer *get_running_cputimer(struct task_struct *tsk)
+{
+ return NULL;
}
+#endif
/**
* account_group_user_time - Maintain utime for a thread group.
@@ -218,9 +226,9 @@ static inline bool cputimer_running(struct task_struct *tsk)
static inline void account_group_user_time(struct task_struct *tsk,
cputime_t cputime)
{
- struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
+ struct thread_group_cputimer *cputimer = get_running_cputimer(tsk);
- if (!cputimer_running(tsk))
+ if (!cputimer)
return;
atomic64_add(cputime, &cputimer->cputime_atomic.utime);
@@ -239,9 +247,9 @@ static inline void account_group_user_time(struct task_struct *tsk,
static inline void account_group_system_time(struct task_struct *tsk,
cputime_t cputime)
{
- struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
+ struct thread_group_cputimer *cputimer = get_running_cputimer(tsk);
- if (!cputimer_running(tsk))
+ if (!cputimer)
return;
atomic64_add(cputime, &cputimer->cputime_atomic.stime);
@@ -260,9 +268,9 @@ static inline void account_group_system_time(struct task_struct *tsk,
static inline void account_group_exec_runtime(struct task_struct *tsk,
unsigned long long ns)
{
- struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
+ struct thread_group_cputimer *cputimer = get_running_cputimer(tsk);
- if (!cputimer_running(tsk))
+ if (!cputimer)
return;
atomic64_add(ns, &cputimer->cputime_atomic.sum_exec_runtime);
diff --git a/kernel/time/Makefile b/kernel/time/Makefile
index 976840d29a71..938dbf33ef49 100644
--- a/kernel/time/Makefile
+++ b/kernel/time/Makefile
@@ -15,6 +15,5 @@ ifeq ($(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST),y)
endif
obj-$(CONFIG_GENERIC_SCHED_CLOCK) += sched_clock.o
obj-$(CONFIG_TICK_ONESHOT) += tick-oneshot.o tick-sched.o
-obj-$(CONFIG_TIMER_STATS) += timer_stats.o
obj-$(CONFIG_DEBUG_FS) += timekeeping_debug.o
obj-$(CONFIG_TEST_UDELAY) += test_udelay.o
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index c6ecedd3b839..8e11d8d9f419 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -94,17 +94,15 @@ DEFINE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases) =
};
static const int hrtimer_clock_to_base_table[MAX_CLOCKS] = {
+ /* Make sure we catch unsupported clockids */
+ [0 ... MAX_CLOCKS - 1] = HRTIMER_MAX_CLOCK_BASES,
+
[CLOCK_REALTIME] = HRTIMER_BASE_REALTIME,
[CLOCK_MONOTONIC] = HRTIMER_BASE_MONOTONIC,
[CLOCK_BOOTTIME] = HRTIMER_BASE_BOOTTIME,
[CLOCK_TAI] = HRTIMER_BASE_TAI,
};
-static inline int hrtimer_clockid_to_base(clockid_t clock_id)
-{
- return hrtimer_clock_to_base_table[clock_id];
-}
-
/*
* Functions and macros which are different for UP/SMP systems are kept in a
* single place
@@ -766,34 +764,6 @@ void hrtimers_resume(void)
clock_was_set_delayed();
}
-static inline void timer_stats_hrtimer_set_start_info(struct hrtimer *timer)
-{
-#ifdef CONFIG_TIMER_STATS
- if (timer->start_site)
- return;
- timer->start_site = __builtin_return_address(0);
- memcpy(timer->start_comm, current->comm, TASK_COMM_LEN);
- timer->start_pid = current->pid;
-#endif
-}
-
-static inline void timer_stats_hrtimer_clear_start_info(struct hrtimer *timer)
-{
-#ifdef CONFIG_TIMER_STATS
- timer->start_site = NULL;
-#endif
-}
-
-static inline void timer_stats_account_hrtimer(struct hrtimer *timer)
-{
-#ifdef CONFIG_TIMER_STATS
- if (likely(!timer_stats_active))
- return;
- timer_stats_update_stats(timer, timer->start_pid, timer->start_site,
- timer->function, timer->start_comm, 0);
-#endif
-}
-
/*
* Counterpart to lock_hrtimer_base above:
*/
@@ -932,7 +902,6 @@ remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base, bool rest
* rare case and less expensive than a smp call.
*/
debug_deactivate(timer);
- timer_stats_hrtimer_clear_start_info(timer);
reprogram = base->cpu_base == this_cpu_ptr(&hrtimer_bases);
if (!restart)
@@ -990,8 +959,6 @@ void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
/* Switch the timer base, if necessary: */
new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED);
- timer_stats_hrtimer_set_start_info(timer);
-
leftmost = enqueue_hrtimer(timer, new_base);
if (!leftmost)
goto unlock;
@@ -1112,6 +1079,18 @@ u64 hrtimer_get_next_event(void)
}
#endif
+static inline int hrtimer_clockid_to_base(clockid_t clock_id)
+{
+ if (likely(clock_id < MAX_CLOCKS)) {
+ int base = hrtimer_clock_to_base_table[clock_id];
+
+ if (likely(base != HRTIMER_MAX_CLOCK_BASES))
+ return base;
+ }
+ WARN(1, "Invalid clockid %d. Using MONOTONIC\n", clock_id);
+ return HRTIMER_BASE_MONOTONIC;
+}
+
static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
enum hrtimer_mode mode)
{
@@ -1128,12 +1107,6 @@ static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
base = hrtimer_clockid_to_base(clock_id);
timer->base = &cpu_base->clock_base[base];
timerqueue_init(&timer->node);
-
-#ifdef CONFIG_TIMER_STATS
- timer->start_site = NULL;
- timer->start_pid = -1;
- memset(timer->start_comm, 0, TASK_COMM_LEN);
-#endif
}
/**
@@ -1217,7 +1190,6 @@ static void __run_hrtimer(struct hrtimer_cpu_base *cpu_base,
raw_write_seqcount_barrier(&cpu_base->seq);
__remove_hrtimer(timer, base, HRTIMER_STATE_INACTIVE, 0);
- timer_stats_account_hrtimer(timer);
fn = timer->function;
/*
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 17ac99b60ee5..987e496bb51a 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -29,12 +29,13 @@
*/
static struct tick_device tick_broadcast_device;
-static cpumask_var_t tick_broadcast_mask;
-static cpumask_var_t tick_broadcast_on;
-static cpumask_var_t tmpmask;
-static DEFINE_RAW_SPINLOCK(tick_broadcast_lock);
+static cpumask_var_t tick_broadcast_mask __cpumask_var_read_mostly;
+static cpumask_var_t tick_broadcast_on __cpumask_var_read_mostly;
+static cpumask_var_t tmpmask __cpumask_var_read_mostly;
static int tick_broadcast_forced;
+static __cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(tick_broadcast_lock);
+
#ifdef CONFIG_TICK_ONESHOT
static void tick_broadcast_clear_oneshot(int cpu);
static void tick_resume_broadcast_oneshot(struct clock_event_device *bc);
@@ -516,9 +517,9 @@ void tick_resume_broadcast(void)
#ifdef CONFIG_TICK_ONESHOT
-static cpumask_var_t tick_broadcast_oneshot_mask;
-static cpumask_var_t tick_broadcast_pending_mask;
-static cpumask_var_t tick_broadcast_force_mask;
+static cpumask_var_t tick_broadcast_oneshot_mask __cpumask_var_read_mostly;
+static cpumask_var_t tick_broadcast_pending_mask __cpumask_var_read_mostly;
+static cpumask_var_t tick_broadcast_force_mask __cpumask_var_read_mostly;
/*
* Exposed for debugging: see timer_list.c
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index db087d7e106d..95b258dd75db 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1275,27 +1275,8 @@ error: /* even if we error out, we forwarded the time, so call update */
}
EXPORT_SYMBOL(timekeeping_inject_offset);
-
-/**
- * timekeeping_get_tai_offset - Returns current TAI offset from UTC
- *
- */
-s32 timekeeping_get_tai_offset(void)
-{
- struct timekeeper *tk = &tk_core.timekeeper;
- unsigned int seq;
- s32 ret;
-
- do {
- seq = read_seqcount_begin(&tk_core.seq);
- ret = tk->tai_offset;
- } while (read_seqcount_retry(&tk_core.seq, seq));
-
- return ret;
-}
-
/**
- * __timekeeping_set_tai_offset - Lock free worker function
+ * __timekeeping_set_tai_offset - Sets the TAI offset from UTC and monotonic
*
*/
static void __timekeeping_set_tai_offset(struct timekeeper *tk, s32 tai_offset)
@@ -1305,24 +1286,6 @@ static void __timekeeping_set_tai_offset(struct timekeeper *tk, s32 tai_offset)
}
/**
- * timekeeping_set_tai_offset - Sets the current TAI offset from UTC
- *
- */
-void timekeeping_set_tai_offset(s32 tai_offset)
-{
- struct timekeeper *tk = &tk_core.timekeeper;
- unsigned long flags;
-
- raw_spin_lock_irqsave(&timekeeper_lock, flags);
- write_seqcount_begin(&tk_core.seq);
- __timekeeping_set_tai_offset(tk, tai_offset);
- timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET);
- write_seqcount_end(&tk_core.seq);
- raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
- clock_was_set();
-}
-
-/**
* change_clocksource - Swaps clocksources if a new one is available
*
* Accumulates current time interval and initializes new clocksource
diff --git a/kernel/time/timekeeping.h b/kernel/time/timekeeping.h
index 704f595ce83f..d0914676d4c5 100644
--- a/kernel/time/timekeeping.h
+++ b/kernel/time/timekeeping.h
@@ -11,8 +11,6 @@ extern ktime_t ktime_get_update_offsets_now(unsigned int *cwsseq,
extern int timekeeping_valid_for_hres(void);
extern u64 timekeeping_max_deferment(void);
extern int timekeeping_inject_offset(struct timespec *ts);
-extern s32 timekeeping_get_tai_offset(void);
-extern void timekeeping_set_tai_offset(s32 tai_offset);
extern int timekeeping_suspend(void);
extern void timekeeping_resume(void);
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index ec33a6933eae..82a6bfa0c307 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -571,38 +571,6 @@ internal_add_timer(struct timer_base *base, struct timer_list *timer)
trigger_dyntick_cpu(base, timer);
}
-#ifdef CONFIG_TIMER_STATS
-void __timer_stats_timer_set_start_info(struct timer_list *timer, void *addr)
-{
- if (timer->start_site)
- return;
-
- timer->start_site = addr;
- memcpy(timer->start_comm, current->comm, TASK_COMM_LEN);
- timer->start_pid = current->pid;
-}
-
-static void timer_stats_account_timer(struct timer_list *timer)
-{
- void *site;
-
- /*
- * start_site can be concurrently reset by
- * timer_stats_timer_clear_start_info()
- */
- site = READ_ONCE(timer->start_site);
- if (likely(!site))
- return;
-
- timer_stats_update_stats(timer, timer->start_pid, site,
- timer->function, timer->start_comm,
- timer->flags);
-}
-
-#else
-static void timer_stats_account_timer(struct timer_list *timer) {}
-#endif
-
#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
static struct debug_obj_descr timer_debug_descr;
@@ -789,11 +757,6 @@ static void do_init_timer(struct timer_list *timer, unsigned int flags,
{
timer->entry.pprev = NULL;
timer->flags = flags | raw_smp_processor_id();
-#ifdef CONFIG_TIMER_STATS
- timer->start_site = NULL;
- timer->start_pid = -1;
- memset(timer->start_comm, 0, TASK_COMM_LEN);
-#endif
lockdep_init_map(&timer->lockdep_map, name, key, 0);
}
@@ -1001,8 +964,6 @@ __mod_timer(struct timer_list *timer, unsigned long expires, bool pending_only)
base = lock_timer_base(timer, &flags);
}
- timer_stats_timer_set_start_info(timer);
-
ret = detach_if_pending(timer, base, false);
if (!ret && pending_only)
goto out_unlock;
@@ -1130,7 +1091,6 @@ void add_timer_on(struct timer_list *timer, int cpu)
struct timer_base *new_base, *base;
unsigned long flags;
- timer_stats_timer_set_start_info(timer);
BUG_ON(timer_pending(timer) || !timer->function);
new_base = get_timer_cpu_base(timer->flags, cpu);
@@ -1176,7 +1136,6 @@ int del_timer(struct timer_list *timer)
debug_assert_init(timer);
- timer_stats_timer_clear_start_info(timer);
if (timer_pending(timer)) {
base = lock_timer_base(timer, &flags);
ret = detach_if_pending(timer, base, true);
@@ -1204,10 +1163,9 @@ int try_to_del_timer_sync(struct timer_list *timer)
base = lock_timer_base(timer, &flags);
- if (base->running_timer != timer) {
- timer_stats_timer_clear_start_info(timer);
+ if (base->running_timer != timer)
ret = detach_if_pending(timer, base, true);
- }
+
spin_unlock_irqrestore(&base->lock, flags);
return ret;
@@ -1331,7 +1289,6 @@ static void expire_timers(struct timer_base *base, struct hlist_head *head)
unsigned long data;
timer = hlist_entry(head->first, struct timer_list, entry);
- timer_stats_account_timer(timer);
base->running_timer = timer;
detach_timer(timer, true);
@@ -1868,7 +1825,6 @@ static void __init init_timer_cpus(void)
void __init init_timers(void)
{
init_timer_cpus();
- init_timer_stats();
open_softirq(TIMER_SOFTIRQ, run_timer_softirq);
}
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index afe6cd1944fc..ff8d5c13d04b 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -62,21 +62,11 @@ static void
print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer,
int idx, u64 now)
{
-#ifdef CONFIG_TIMER_STATS
- char tmp[TASK_COMM_LEN + 1];
-#endif
SEQ_printf(m, " #%d: ", idx);
print_name_offset(m, taddr);
SEQ_printf(m, ", ");
print_name_offset(m, timer->function);
SEQ_printf(m, ", S:%02x", timer->state);
-#ifdef CONFIG_TIMER_STATS
- SEQ_printf(m, ", ");
- print_name_offset(m, timer->start_site);
- memcpy(tmp, timer->start_comm, TASK_COMM_LEN);
- tmp[TASK_COMM_LEN] = 0;
- SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
-#endif
SEQ_printf(m, "\n");
SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
(unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
@@ -127,7 +117,7 @@ print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
SEQ_printf(m, " .base: %pK\n", base);
SEQ_printf(m, " .index: %d\n", base->index);
- SEQ_printf(m, " .resolution: %u nsecs\n", (unsigned) hrtimer_resolution);
+ SEQ_printf(m, " .resolution: %u nsecs\n", hrtimer_resolution);
SEQ_printf(m, " .get_time: ");
print_name_offset(m, base->get_time);
diff --git a/kernel/time/timer_stats.c b/kernel/time/timer_stats.c
deleted file mode 100644
index afddded947df..000000000000
--- a/kernel/time/timer_stats.c
+++ /dev/null
@@ -1,425 +0,0 @@
-/*
- * kernel/time/timer_stats.c
- *
- * Collect timer usage statistics.
- *
- * Copyright(C) 2006, Red Hat, Inc., Ingo Molnar
- * Copyright(C) 2006 Timesys Corp., Thomas Gleixner <tglx@timesys.com>
- *
- * timer_stats is based on timer_top, a similar functionality which was part of
- * Con Kolivas dyntick patch set. It was developed by Daniel Petrini at the
- * Instituto Nokia de Tecnologia - INdT - Manaus. timer_top's design was based
- * on dynamic allocation of the statistics entries and linear search based
- * lookup combined with a global lock, rather than the static array, hash
- * and per-CPU locking which is used by timer_stats. It was written for the
- * pre hrtimer kernel code and therefore did not take hrtimers into account.
- * Nevertheless it provided the base for the timer_stats implementation and
- * was a helpful source of inspiration. Kudos to Daniel and the Nokia folks
- * for this effort.
- *
- * timer_top.c is
- * Copyright (C) 2005 Instituto Nokia de Tecnologia - INdT - Manaus
- * Written by Daniel Petrini <d.pensator@gmail.com>
- * timer_top.c was released under the GNU General Public License version 2
- *
- * We export the addresses and counting of timer functions being called,
- * the pid and cmdline from the owner process if applicable.
- *
- * Start/stop data collection:
- * # echo [1|0] >/proc/timer_stats
- *
- * Display the information collected so far:
- * # cat /proc/timer_stats
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/proc_fs.h>
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/sched.h>
-#include <linux/seq_file.h>
-#include <linux/kallsyms.h>
-
-#include <linux/uaccess.h>
-
-/*
- * This is our basic unit of interest: a timer expiry event identified
- * by the timer, its start/expire functions and the PID of the task that
- * started the timer. We count the number of times an event happens:
- */
-struct entry {
- /*
- * Hash list:
- */
- struct entry *next;
-
- /*
- * Hash keys:
- */
- void *timer;
- void *start_func;
- void *expire_func;
- pid_t pid;
-
- /*
- * Number of timeout events:
- */
- unsigned long count;
- u32 flags;
-
- /*
- * We save the command-line string to preserve
- * this information past task exit:
- */
- char comm[TASK_COMM_LEN + 1];
-
-} ____cacheline_aligned_in_smp;
-
-/*
- * Spinlock protecting the tables - not taken during lookup:
- */
-static DEFINE_RAW_SPINLOCK(table_lock);
-
-/*
- * Per-CPU lookup locks for fast hash lookup:
- */
-static DEFINE_PER_CPU(raw_spinlock_t, tstats_lookup_lock);
-
-/*
- * Mutex to serialize state changes with show-stats activities:
- */
-static DEFINE_MUTEX(show_mutex);
-
-/*
- * Collection status, active/inactive:
- */
-int __read_mostly timer_stats_active;
-
-/*
- * Beginning/end timestamps of measurement:
- */
-static ktime_t time_start, time_stop;
-
-/*
- * tstat entry structs only get allocated while collection is
- * active and never freed during that time - this simplifies
- * things quite a bit.
- *
- * They get freed when a new collection period is started.
- */
-#define MAX_ENTRIES_BITS 10
-#define MAX_ENTRIES (1UL << MAX_ENTRIES_BITS)
-
-static unsigned long nr_entries;
-static struct entry entries[MAX_ENTRIES];
-
-static atomic_t overflow_count;
-
-/*
- * The entries are in a hash-table, for fast lookup:
- */
-#define TSTAT_HASH_BITS (MAX_ENTRIES_BITS - 1)
-#define TSTAT_HASH_SIZE (1UL << TSTAT_HASH_BITS)
-#define TSTAT_HASH_MASK (TSTAT_HASH_SIZE - 1)
-
-#define __tstat_hashfn(entry) \
- (((unsigned long)(entry)->timer ^ \
- (unsigned long)(entry)->start_func ^ \
- (unsigned long)(entry)->expire_func ^ \
- (unsigned long)(entry)->pid ) & TSTAT_HASH_MASK)
-
-#define tstat_hashentry(entry) (tstat_hash_table + __tstat_hashfn(entry))
-
-static struct entry *tstat_hash_table[TSTAT_HASH_SIZE] __read_mostly;
-
-static void reset_entries(void)
-{
- nr_entries = 0;
- memset(entries, 0, sizeof(entries));
- memset(tstat_hash_table, 0, sizeof(tstat_hash_table));
- atomic_set(&overflow_count, 0);
-}
-
-static struct entry *alloc_entry(void)
-{
- if (nr_entries >= MAX_ENTRIES)
- return NULL;
-
- return entries + nr_entries++;
-}
-
-static int match_entries(struct entry *entry1, struct entry *entry2)
-{
- return entry1->timer == entry2->timer &&
- entry1->start_func == entry2->start_func &&
- entry1->expire_func == entry2->expire_func &&
- entry1->pid == entry2->pid;
-}
-
-/*
- * Look up whether an entry matching this item is present
- * in the hash already. Must be called with irqs off and the
- * lookup lock held:
- */
-static struct entry *tstat_lookup(struct entry *entry, char *comm)
-{
- struct entry **head, *curr, *prev;
-
- head = tstat_hashentry(entry);
- curr = *head;
-
- /*
- * The fastpath is when the entry is already hashed,
- * we do this with the lookup lock held, but with the
- * table lock not held:
- */
- while (curr) {
- if (match_entries(curr, entry))
- return curr;
-
- curr = curr->next;
- }
- /*
- * Slowpath: allocate, set up and link a new hash entry:
- */
- prev = NULL;
- curr = *head;
-
- raw_spin_lock(&table_lock);
- /*
- * Make sure we have not raced with another CPU:
- */
- while (curr) {
- if (match_entries(curr, entry))
- goto out_unlock;
-
- prev = curr;
- curr = curr->next;
- }
-
- curr = alloc_entry();
- if (curr) {
- *curr = *entry;
- curr->count = 0;
- curr->next = NULL;
- memcpy(curr->comm, comm, TASK_COMM_LEN);
-
- smp_mb(); /* Ensure that curr is initialized before insert */
-
- if (prev)
- prev->next = curr;
- else
- *head = curr;
- }
- out_unlock:
- raw_spin_unlock(&table_lock);
-
- return curr;
-}
-
-/**
- * timer_stats_update_stats - Update the statistics for a timer.
- * @timer: pointer to either a timer_list or a hrtimer
- * @pid: the pid of the task which set up the timer
- * @startf: pointer to the function which did the timer setup
- * @timerf: pointer to the timer callback function of the timer
- * @comm: name of the process which set up the timer
- * @tflags: The flags field of the timer
- *
- * When the timer is already registered, then the event counter is
- * incremented. Otherwise the timer is registered in a free slot.
- */
-void timer_stats_update_stats(void *timer, pid_t pid, void *startf,
- void *timerf, char *comm, u32 tflags)
-{
- /*
- * It doesn't matter which lock we take:
- */
- raw_spinlock_t *lock;
- struct entry *entry, input;
- unsigned long flags;
-
- if (likely(!timer_stats_active))
- return;
-
- lock = &per_cpu(tstats_lookup_lock, raw_smp_processor_id());
-
- input.timer = timer;
- input.start_func = startf;
- input.expire_func = timerf;
- input.pid = pid;
- input.flags = tflags;
-
- raw_spin_lock_irqsave(lock, flags);
- if (!timer_stats_active)
- goto out_unlock;
-
- entry = tstat_lookup(&input, comm);
- if (likely(entry))
- entry->count++;
- else
- atomic_inc(&overflow_count);
-
- out_unlock:
- raw_spin_unlock_irqrestore(lock, flags);
-}
-
-static void print_name_offset(struct seq_file *m, unsigned long addr)
-{
- char symname[KSYM_NAME_LEN];
-
- if (lookup_symbol_name(addr, symname) < 0)
- seq_printf(m, "<%p>", (void *)addr);
- else
- seq_printf(m, "%s", symname);
-}
-
-static int tstats_show(struct seq_file *m, void *v)
-{
- struct timespec64 period;
- struct entry *entry;
- unsigned long ms;
- long events = 0;
- ktime_t time;
- int i;
-
- mutex_lock(&show_mutex);
- /*
- * If still active then calculate up to now:
- */
- if (timer_stats_active)
- time_stop = ktime_get();
-
- time = ktime_sub(time_stop, time_start);
-
- period = ktime_to_timespec64(time);
- ms = period.tv_nsec / 1000000;
-
- seq_puts(m, "Timer Stats Version: v0.3\n");
- seq_printf(m, "Sample period: %ld.%03ld s\n", (long)period.tv_sec, ms);
- if (atomic_read(&overflow_count))
- seq_printf(m, "Overflow: %d entries\n", atomic_read(&overflow_count));
- seq_printf(m, "Collection: %s\n", timer_stats_active ? "active" : "inactive");
-
- for (i = 0; i < nr_entries; i++) {
- entry = entries + i;
- if (entry->flags & TIMER_DEFERRABLE) {
- seq_printf(m, "%4luD, %5d %-16s ",
- entry->count, entry->pid, entry->comm);
- } else {
- seq_printf(m, " %4lu, %5d %-16s ",
- entry->count, entry->pid, entry->comm);
- }
-
- print_name_offset(m, (unsigned long)entry->start_func);
- seq_puts(m, " (");
- print_name_offset(m, (unsigned long)entry->expire_func);
- seq_puts(m, ")\n");
-
- events += entry->count;
- }
-
- ms += period.tv_sec * 1000;
- if (!ms)
- ms = 1;
-
- if (events && period.tv_sec)
- seq_printf(m, "%ld total events, %ld.%03ld events/sec\n",
- events, events * 1000 / ms,
- (events * 1000000 / ms) % 1000);
- else
- seq_printf(m, "%ld total events\n", events);
-
- mutex_unlock(&show_mutex);
-
- return 0;
-}
-
-/*
- * After a state change, make sure all concurrent lookup/update
- * activities have stopped:
- */
-static void sync_access(void)
-{
- unsigned long flags;
- int cpu;
-
- for_each_online_cpu(cpu) {
- raw_spinlock_t *lock = &per_cpu(tstats_lookup_lock, cpu);
-
- raw_spin_lock_irqsave(lock, flags);
- /* nothing */
- raw_spin_unlock_irqrestore(lock, flags);
- }
-}
-
-static ssize_t tstats_write(struct file *file, const char __user *buf,
- size_t count, loff_t *offs)
-{
- char ctl[2];
-
- if (count != 2 || *offs)
- return -EINVAL;
-
- if (copy_from_user(ctl, buf, count))
- return -EFAULT;
-
- mutex_lock(&show_mutex);
- switch (ctl[0]) {
- case '0':
- if (timer_stats_active) {
- timer_stats_active = 0;
- time_stop = ktime_get();
- sync_access();
- }
- break;
- case '1':
- if (!timer_stats_active) {
- reset_entries();
- time_start = ktime_get();
- smp_mb();
- timer_stats_active = 1;
- }
- break;
- default:
- count = -EINVAL;
- }
- mutex_unlock(&show_mutex);
-
- return count;
-}
-
-static int tstats_open(struct inode *inode, struct file *filp)
-{
- return single_open(filp, tstats_show, NULL);
-}
-
-static const struct file_operations tstats_fops = {
- .open = tstats_open,
- .read = seq_read,
- .write = tstats_write,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-void __init init_timer_stats(void)
-{
- int cpu;
-
- for_each_possible_cpu(cpu)
- raw_spin_lock_init(&per_cpu(tstats_lookup_lock, cpu));
-}
-
-static int __init init_tstats_procfs(void)
-{
- struct proc_dir_entry *pe;
-
- pe = proc_create("timer_stats", 0644, NULL, &tstats_fops);
- if (!pe)
- return -ENOMEM;
- return 0;
-}
-__initcall(init_tstats_procfs);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 1d9fb6543a66..072cbc9b175d 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1523,8 +1523,6 @@ static void __queue_delayed_work(int cpu, struct workqueue_struct *wq,
return;
}
- timer_stats_timer_set_start_info(&dwork->timer);
-
dwork->wq = wq;
dwork->cpu = cpu;
timer->expires = jiffies + delay;