#include <linux/init.h>
#include <linux/list.h>
#include <linux/wait.h>
+ #include <linux/percpu.h>
+
struct hrtimer_clock_base;
struct hrtimer_cpu_base;
/**
* struct hrtimer - the basic hrtimer structure
* @node: red black tree node for time ordered insertion
- * @expires: the absolute expiry time in the hrtimers internal
+ * @_expires: the absolute expiry time in the hrtimers internal
* representation. The time is related to the clock on
- * which the timer is based.
+ * which the timer is based. Is setup by adding
+ * slack to the _softexpires value. For non range timers
+ * identical to _softexpires.
+ * @_softexpires: the absolute earliest expiry time of the hrtimer.
+ * The time which was given as expiry time when the timer
+ * was armed.
* @function: timer expiry callback function
* @base: pointer to the timer base (per cpu and per clock)
* @state: state information (See bit values above)
*/
struct hrtimer {
struct rb_node node;
- ktime_t expires;
+ ktime_t _expires;
+ ktime_t _softexpires;
enum hrtimer_restart (*function)(struct hrtimer *);
struct hrtimer_clock_base *base;
unsigned long state;
- enum hrtimer_cb_mode cb_mode;
struct list_head cb_entry;
+ enum hrtimer_cb_mode cb_mode;
#ifdef CONFIG_TIMER_STATS
+ int start_pid;
void *start_site;
char start_comm[16];
- int start_pid;
#endif
};
* @first: pointer to the timer node which expires first
* @resolution: the resolution of the clock, in nanoseconds
* @get_time: function to retrieve the current time of the clock
- * @get_softirq_time: function to retrieve the current time from the softirq
* @softirq_time: the time when running the hrtimer queue in the softirq
* @offset: offset of this clock to the monotonic base
- * @reprogram: function to reprogram the timer event
*/
struct hrtimer_clock_base {
struct hrtimer_cpu_base *cpu_base;
struct rb_node *first;
ktime_t resolution;
ktime_t (*get_time)(void);
- ktime_t (*get_softirq_time)(void);
ktime_t softirq_time;
#ifdef CONFIG_HIGH_RES_TIMERS
ktime_t offset;
- int (*reprogram)(struct hrtimer *t,
- struct hrtimer_clock_base *b,
- ktime_t n);
#endif
};
#endif
};
+ static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time)
+ {
+ timer->_expires = time;
+ timer->_softexpires = time;
+ }
+
+ static inline void hrtimer_set_expires_range(struct hrtimer *timer, ktime_t time, ktime_t delta)
+ {
+ timer->_softexpires = time;
+ timer->_expires = ktime_add_safe(time, delta);
+ }
+
+ static inline void hrtimer_set_expires_range_ns(struct hrtimer *timer, ktime_t time, unsigned long delta)
+ {
+ timer->_softexpires = time;
+ timer->_expires = ktime_add_safe(time, ns_to_ktime(delta));
+ }
+
+ static inline void hrtimer_set_expires_tv64(struct hrtimer *timer, s64 tv64)
+ {
+ timer->_expires.tv64 = tv64;
+ timer->_softexpires.tv64 = tv64;
+ }
+
+ static inline void hrtimer_add_expires(struct hrtimer *timer, ktime_t time)
+ {
+ timer->_expires = ktime_add_safe(timer->_expires, time);
+ timer->_softexpires = ktime_add_safe(timer->_softexpires, time);
+ }
+
+ static inline void hrtimer_add_expires_ns(struct hrtimer *timer, unsigned long ns)
+ {
+ timer->_expires = ktime_add_ns(timer->_expires, ns);
+ timer->_softexpires = ktime_add_ns(timer->_softexpires, ns);
+ }
+
+ static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer)
+ {
+ return timer->_expires;
+ }
+
+ static inline ktime_t hrtimer_get_softexpires(const struct hrtimer *timer)
+ {
+ return timer->_softexpires;
+ }
+
+ static inline s64 hrtimer_get_expires_tv64(const struct hrtimer *timer)
+ {
+ return timer->_expires.tv64;
+ }
+ static inline s64 hrtimer_get_softexpires_tv64(const struct hrtimer *timer)
+ {
+ return timer->_softexpires.tv64;
+ }
+
+ static inline s64 hrtimer_get_expires_ns(const struct hrtimer *timer)
+ {
+ return ktime_to_ns(timer->_expires);
+ }
+
+ static inline ktime_t hrtimer_expires_remaining(const struct hrtimer *timer)
+ {
+ return ktime_sub(timer->_expires, timer->base->get_time());
+ }
+
#ifdef CONFIG_HIGH_RES_TIMERS
struct clock_event_device;
return timer->base->cpu_base->hres_active;
}
+ extern void hrtimer_peek_ahead_timers(void);
+
/*
* The resolution of the clocks. The resolution value is returned in
* the clock_getres() system call to give application programmers an
* is expired in the next softirq when the clock was advanced.
*/
static inline void clock_was_set(void) { }
+ static inline void hrtimer_peek_ahead_timers(void) { }
static inline void hres_timers_resume(void) { }
extern ktime_t ktime_get(void);
extern ktime_t ktime_get_real(void);
+
+ DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
+
+
/* Exported timer functions: */
/* Initialize timers: */
/* Basic timer operations: */
extern int hrtimer_start(struct hrtimer *timer, ktime_t tim,
const enum hrtimer_mode mode);
+ extern int hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
+ unsigned long range_ns, const enum hrtimer_mode mode);
extern int hrtimer_cancel(struct hrtimer *timer);
extern int hrtimer_try_to_cancel(struct hrtimer *timer);
+ static inline int hrtimer_start_expires(struct hrtimer *timer,
+ enum hrtimer_mode mode)
+ {
+ unsigned long delta;
+ ktime_t soft, hard;
+ soft = hrtimer_get_softexpires(timer);
+ hard = hrtimer_get_expires(timer);
+ delta = ktime_to_ns(ktime_sub(hard, soft));
+ return hrtimer_start_range_ns(timer, soft, delta, mode);
+ }
+
static inline int hrtimer_restart(struct hrtimer *timer)
{
- return hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS);
+ return hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
}
/* Query timers: */
extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
struct task_struct *tsk);
+ extern int schedule_hrtimeout_range(ktime_t *expires, unsigned long delta,
+ const enum hrtimer_mode mode);
+ extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode);
+
/* Soft interrupt function to run the hrtimer queues: */
extern void hrtimer_run_queues(void);
extern void hrtimer_run_pending(void);
#define MMF_DUMP_MAPPED_PRIVATE 4
#define MMF_DUMP_MAPPED_SHARED 5
#define MMF_DUMP_ELF_HEADERS 6
+#define MMF_DUMP_HUGETLB_PRIVATE 7
+#define MMF_DUMP_HUGETLB_SHARED 8
#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
-#define MMF_DUMP_FILTER_BITS 5
+#define MMF_DUMP_FILTER_BITS 7
#define MMF_DUMP_FILTER_MASK \
(((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
#define MMF_DUMP_FILTER_DEFAULT \
- ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
+ ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
+ (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
+
+#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
+# define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
+#else
+# define MMF_DUMP_MASK_DEFAULT_ELF 0
+#endif
struct sighand_struct {
atomic_t count;
unsigned long ac_minflt, ac_majflt;
};
+/**
+ * struct task_cputime - collected CPU time counts
+ * @utime: time spent in user mode, in &cputime_t units
+ * @stime: time spent in kernel mode, in &cputime_t units
+ * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
+ *
+ * This structure groups together three kinds of CPU time that are
+ * tracked for threads and thread groups. Most things considering
+ * CPU time want to group these counts together and treat all three
+ * of them in parallel.
+ */
+struct task_cputime {
+ cputime_t utime;
+ cputime_t stime;
+ unsigned long long sum_exec_runtime;
+};
+/* Alternate field names when used to cache expirations. */
+#define prof_exp stime
+#define virt_exp utime
+#define sched_exp sum_exec_runtime
+
+/**
+ * struct thread_group_cputime - thread group interval timer counts
+ * @totals: thread group interval timers; substructure for
+ * uniprocessor kernel, per-cpu for SMP kernel.
+ *
+ * This structure contains the version of task_cputime, above, that is
+ * used for thread group CPU clock calculations.
+ */
+struct thread_group_cputime {
+ struct task_cputime *totals;
+};
+
/*
* NOTE! "signal_struct" does not have it's own
* locking, because a shared signal_struct always
cputime_t it_prof_expires, it_virt_expires;
cputime_t it_prof_incr, it_virt_incr;
+ /*
+ * Thread group totals for process CPU clocks.
+ * See thread_group_cputime(), et al, for details.
+ */
+ struct thread_group_cputime cputime;
+
+ /* Earliest-expiration cache. */
+ struct task_cputime cputime_expires;
+
+ struct list_head cpu_timers[3];
+
/* job control IDs */
/*
* Live threads maintain their own counters and add to these
* in __exit_signal, except for the group leader.
*/
- cputime_t utime, stime, cutime, cstime;
+ cputime_t cutime, cstime;
cputime_t gtime;
cputime_t cgtime;
unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
unsigned long inblock, oublock, cinblock, coublock;
struct task_io_accounting ioac;
- /*
- * Cumulative ns of scheduled CPU time for dead threads in the
- * group, not including a zombie group leader. (This only differs
- * from jiffies_to_ns(utime + stime) if sched_clock uses something
- * other than jiffies.)
- */
- unsigned long long sum_sched_runtime;
-
/*
* We don't bother to synchronize most readers of this at all,
* because there is no reader checking a limit that actually needs
*/
struct rlimit rlim[RLIM_NLIMITS];
- struct list_head cpu_timers[3];
-
/* keep the process-shared keyrings here so that they do the right
* thing in threads created with CLONE_THREAD */
#ifdef CONFIG_KEYS
/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
unsigned long min_flt, maj_flt;
- cputime_t it_prof_expires, it_virt_expires;
- unsigned long long it_sched_expires;
+ struct task_cputime cputime_expires;
struct list_head cpu_timers[3];
/* process credentials */
int latency_record_count;
struct latency_record latency_record[LT_SAVECOUNT];
#endif
+ /*
+ * time slack values; these are used to round up poll() and
+ * select() etc timeout values. These are in nanoseconds.
+ */
+ unsigned long timer_slack_ns;
+ unsigned long default_timer_slack_ns;
};
/*
extern unsigned long long
task_sched_runtime(struct task_struct *task);
+extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
/* sched_exec is called by processes performing an exec */
#ifdef CONFIG_SMP
#endif
}
+/*
+ * Thread group CPU time accounting.
+ */
+
+extern int thread_group_cputime_alloc(struct task_struct *);
+extern void thread_group_cputime(struct task_struct *, struct task_cputime *);
+
+static inline void thread_group_cputime_init(struct signal_struct *sig)
+{
+ sig->cputime.totals = NULL;
+}
+
+static inline int thread_group_cputime_clone_thread(struct task_struct *curr)
+{
+ if (curr->signal->cputime.totals)
+ return 0;
+ return thread_group_cputime_alloc(curr);
+}
+
+static inline void thread_group_cputime_free(struct signal_struct *sig)
+{
+ free_percpu(sig->cputime.totals);
+}
+
/*
* Reevaluate whether the task has signals pending delivery.
* Wake the task if so.
#define NSEC_PER_SEC 1000000000L
#define FSEC_PER_SEC 1000000000000000L
+ #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
+
static inline int timespec_equal(const struct timespec *a,
const struct timespec *b)
{
const unsigned int min, const unsigned int sec);
extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
+ extern struct timespec timespec_add_safe(const struct timespec lhs,
+ const struct timespec rhs);
/*
* sub = lhs - rhs, in normalized form
extern unsigned int alarm_setitimer(unsigned int seconds);
extern int do_getitimer(int which, struct itimerval *value);
extern void getnstimeofday(struct timespec *tv);
+extern void getrawmonotonic(struct timespec *ts);
extern void getboottime(struct timespec *ts);
extern void monotonic_to_bootbased(struct timespec *ts);
extern void update_wall_time(void);
extern void update_xtime_cache(u64 nsec);
+struct tms;
+extern void do_sys_times(struct tms *);
+
/**
* timespec_to_ns - Convert timespec to nanoseconds
* @ts: pointer to the timespec variable to be converted
#define CLOCK_MONOTONIC 1
#define CLOCK_PROCESS_CPUTIME_ID 2
#define CLOCK_THREAD_CPUTIME_ID 3
+#define CLOCK_MONOTONIC_RAW 4
/*
* The IDs of various hardware clocks:
#include <linux/tty.h>
#include <linux/proc_fs.h>
#include <linux/blkdev.h>
+#include <trace/sched.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
kmem_cache_free(sighand_cachep, sighand);
}
+
+/*
+ * Initialize POSIX timer handling for a thread group.
+ */
+static void posix_cpu_timers_init_group(struct signal_struct *sig)
+{
+ /* Thread group counters. */
+ thread_group_cputime_init(sig);
+
+ /* Expiration times and increments. */
+ sig->it_virt_expires = cputime_zero;
+ sig->it_virt_incr = cputime_zero;
+ sig->it_prof_expires = cputime_zero;
+ sig->it_prof_incr = cputime_zero;
+
+ /* Cached expiration times. */
+ sig->cputime_expires.prof_exp = cputime_zero;
+ sig->cputime_expires.virt_exp = cputime_zero;
+ sig->cputime_expires.sched_exp = 0;
+
+ /* The timer lists. */
+ INIT_LIST_HEAD(&sig->cpu_timers[0]);
+ INIT_LIST_HEAD(&sig->cpu_timers[1]);
+ INIT_LIST_HEAD(&sig->cpu_timers[2]);
+}
+
static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
{
struct signal_struct *sig;
int ret;
if (clone_flags & CLONE_THREAD) {
- atomic_inc(¤t->signal->count);
- atomic_inc(¤t->signal->live);
- return 0;
+ ret = thread_group_cputime_clone_thread(current);
+ if (likely(!ret)) {
+ atomic_inc(¤t->signal->count);
+ atomic_inc(¤t->signal->live);
+ }
+ return ret;
}
sig = kmem_cache_alloc(signal_cachep, GFP_KERNEL);
tsk->signal = sig;
sig->it_real_incr.tv64 = 0;
sig->real_timer.function = it_real_fn;
- sig->it_virt_expires = cputime_zero;
- sig->it_virt_incr = cputime_zero;
- sig->it_prof_expires = cputime_zero;
- sig->it_prof_incr = cputime_zero;
-
sig->leader = 0; /* session leadership doesn't inherit */
sig->tty_old_pgrp = NULL;
sig->tty = NULL;
- sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero;
+ sig->cutime = sig->cstime = cputime_zero;
sig->gtime = cputime_zero;
sig->cgtime = cputime_zero;
sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0;
sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0;
sig->inblock = sig->oublock = sig->cinblock = sig->coublock = 0;
task_io_accounting_init(&sig->ioac);
- sig->sum_sched_runtime = 0;
- INIT_LIST_HEAD(&sig->cpu_timers[0]);
- INIT_LIST_HEAD(&sig->cpu_timers[1]);
- INIT_LIST_HEAD(&sig->cpu_timers[2]);
taskstats_tgid_init(sig);
task_lock(current->group_leader);
memcpy(sig->rlim, current->signal->rlim, sizeof sig->rlim);
task_unlock(current->group_leader);
- if (sig->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
- /*
- * New sole thread in the process gets an expiry time
- * of the whole CPU time limit.
- */
- tsk->it_prof_expires =
- secs_to_cputime(sig->rlim[RLIMIT_CPU].rlim_cur);
- }
+ posix_cpu_timers_init_group(sig);
+
acct_init_pacct(&sig->pacct);
tty_audit_fork(sig);
void __cleanup_signal(struct signal_struct *sig)
{
+ thread_group_cputime_free(sig);
exit_thread_group_keys(sig);
tty_kref_put(sig->tty);
kmem_cache_free(signal_cachep, sig);
}
#endif /* CONFIG_MM_OWNER */
+/*
+ * Initialize POSIX timer handling for a single task.
+ */
+static void posix_cpu_timers_init(struct task_struct *tsk)
+{
+ tsk->cputime_expires.prof_exp = cputime_zero;
+ tsk->cputime_expires.virt_exp = cputime_zero;
+ tsk->cputime_expires.sched_exp = 0;
+ INIT_LIST_HEAD(&tsk->cpu_timers[0]);
+ INIT_LIST_HEAD(&tsk->cpu_timers[1]);
+ INIT_LIST_HEAD(&tsk->cpu_timers[2]);
+}
+
/*
* This creates a new process as a copy of the old one,
* but does not actually start it yet.
p->prev_utime = cputime_zero;
p->prev_stime = cputime_zero;
+ p->default_timer_slack_ns = current->timer_slack_ns;
+
#ifdef CONFIG_DETECT_SOFTLOCKUP
p->last_switch_count = 0;
p->last_switch_timestamp = 0;
task_io_accounting_init(&p->ioac);
acct_clear_integrals(p);
- p->it_virt_expires = cputime_zero;
- p->it_prof_expires = cputime_zero;
- p->it_sched_expires = 0;
- INIT_LIST_HEAD(&p->cpu_timers[0]);
- INIT_LIST_HEAD(&p->cpu_timers[1]);
- INIT_LIST_HEAD(&p->cpu_timers[2]);
+ posix_cpu_timers_init(p);
p->lock_depth = -1; /* -1 = no lock */
do_posix_clock_monotonic_gettime(&p->start_time);
if (clone_flags & CLONE_THREAD) {
p->group_leader = current->group_leader;
list_add_tail_rcu(&p->thread_group, &p->group_leader->thread_group);
-
- if (!cputime_eq(current->signal->it_virt_expires,
- cputime_zero) ||
- !cputime_eq(current->signal->it_prof_expires,
- cputime_zero) ||
- current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY ||
- !list_empty(¤t->signal->cpu_timers[0]) ||
- !list_empty(¤t->signal->cpu_timers[1]) ||
- !list_empty(¤t->signal->cpu_timers[2])) {
- /*
- * Have child wake up on its first tick to check
- * for process CPU timers.
- */
- p->it_prof_expires = jiffies_to_cputime(1);
- }
}
if (likely(p->pid)) {
if (!IS_ERR(p)) {
struct completion vfork;
+ trace_sched_process_fork(current, p);
+
nr = task_pid_vnr(p);
if (clone_flags & CLONE_PARENT_SETTID)
if (!base->first)
continue;
timer = rb_entry(base->first, struct hrtimer, node);
- expires = ktime_sub(timer->expires, base->offset);
+ expires = ktime_sub(hrtimer_get_expires(timer), base->offset);
if (expires.tv64 < cpu_base->expires_next.tv64)
cpu_base->expires_next = expires;
}
struct hrtimer_clock_base *base)
{
ktime_t *expires_next = &__get_cpu_var(hrtimer_bases).expires_next;
- ktime_t expires = ktime_sub(timer->expires, base->offset);
+ ktime_t expires = ktime_sub(hrtimer_get_expires(timer), base->offset);
int res;
- WARN_ON_ONCE(timer->expires.tv64 < 0);
+ WARN_ON_ONCE(hrtimer_get_expires_tv64(timer) < 0);
/*
* When the callback is running, we do not reprogram the clock event
u64 orun = 1;
ktime_t delta;
- delta = ktime_sub(now, timer->expires);
+ delta = ktime_sub(now, hrtimer_get_expires(timer));
if (delta.tv64 < 0)
return 0;
s64 incr = ktime_to_ns(interval);
orun = ktime_divns(delta, incr);
- timer->expires = ktime_add_ns(timer->expires, incr * orun);
- if (timer->expires.tv64 > now.tv64)
+ hrtimer_add_expires_ns(timer, incr * orun);
+ if (hrtimer_get_expires_tv64(timer) > now.tv64)
return orun;
/*
* This (and the ktime_add() below) is the
*/
orun++;
}
- timer->expires = ktime_add_safe(timer->expires, interval);
+ hrtimer_add_expires(timer, interval);
return orun;
}
* We dont care about collisions. Nodes with
* the same expiry time stay together.
*/
- if (timer->expires.tv64 < entry->expires.tv64) {
+ if (hrtimer_get_expires_tv64(timer) <
+ hrtimer_get_expires_tv64(entry)) {
link = &(*link)->rb_left;
} else {
link = &(*link)->rb_right;
}
/**
- * hrtimer_start - (re)start an relative timer on the current CPU
+ * hrtimer_start_range_ns - (re)start an hrtimer on the current CPU
* @timer: the timer to be added
* @tim: expiry time
+ * @delta_ns: "slack" range for the timer
* @mode: expiry mode: absolute (HRTIMER_ABS) or relative (HRTIMER_REL)
*
* Returns:
* 1 when the timer was active
*/
int
- hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
+ hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, unsigned long delta_ns,
+ const enum hrtimer_mode mode)
{
struct hrtimer_clock_base *base, *new_base;
unsigned long flags;
#endif
}
- timer->expires = tim;
+ hrtimer_set_expires_range_ns(timer, tim, delta_ns);
timer_stats_hrtimer_set_start_info(timer);
return ret;
}
+ EXPORT_SYMBOL_GPL(hrtimer_start_range_ns);
+
+ /**
+ * hrtimer_start - (re)start an hrtimer on the current CPU
+ * @timer: the timer to be added
+ * @tim: expiry time
+ * @mode: expiry mode: absolute (HRTIMER_ABS) or relative (HRTIMER_REL)
+ *
+ * Returns:
+ * 0 on success
+ * 1 when the timer was active
+ */
+ int
+ hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
+ {
+ return hrtimer_start_range_ns(timer, tim, 0, mode);
+ }
EXPORT_SYMBOL_GPL(hrtimer_start);
+
/**
* hrtimer_try_to_cancel - try to deactivate a timer
* @timer: hrtimer to stop
ktime_t rem;
base = lock_hrtimer_base(timer, &flags);
- rem = ktime_sub(timer->expires, base->get_time());
+ rem = hrtimer_expires_remaining(timer);
unlock_hrtimer_base(timer, &flags);
return rem;
continue;
timer = rb_entry(base->first, struct hrtimer, node);
- delta.tv64 = timer->expires.tv64;
+ delta.tv64 = hrtimer_get_expires_tv64(timer);
delta = ktime_sub(delta, base->get_time());
if (delta.tv64 < mindelta.tv64)
mindelta.tv64 = delta.tv64;
timer = rb_entry(node, struct hrtimer, node);
- if (basenow.tv64 < timer->expires.tv64) {
+ /*
+ * The immediate goal for using the softexpires is
+ * minimizing wakeups, not running timers at the
+ * earliest interrupt after their soft expiration.
+ * This allows us to avoid using a Priority Search
+ * Tree, which can answer a stabbing querry for
+ * overlapping intervals and instead use the simple
+ * BST we already have.
+ * We don't add extra wakeups by delaying timers that
+ * are right-of a not yet expired timer, because that
+ * timer will have to trigger a wakeup anyway.
+ */
+
+ if (basenow.tv64 < hrtimer_get_softexpires_tv64(timer)) {
ktime_t expires;
- expires = ktime_sub(timer->expires,
+ expires = ktime_sub(hrtimer_get_expires(timer),
base->offset);
if (expires.tv64 < expires_next.tv64)
expires_next = expires;
raise_softirq(HRTIMER_SOFTIRQ);
}
+ /**
+ * hrtimer_peek_ahead_timers -- run soft-expired timers now
+ *
+ * hrtimer_peek_ahead_timers will peek at the timer queue of
+ * the current cpu and check if there are any timers for which
+ * the soft expires time has passed. If any such timers exist,
+ * they are run immediately and then removed from the timer queue.
+ *
+ */
+ void hrtimer_peek_ahead_timers(void)
+ {
+ struct tick_device *td;
+ unsigned long flags;
+
+ if (!hrtimer_hres_active())
+ return;
+
+ local_irq_save(flags);
+ td = &__get_cpu_var(tick_cpu_device);
+ if (td && td->evtdev)
+ hrtimer_interrupt(td->evtdev);
+ local_irq_restore(flags);
+ }
+
static void run_hrtimer_softirq(struct softirq_action *h)
{
run_hrtimer_pending(&__get_cpu_var(hrtimer_bases));
if (!base->first)
continue;
- if (base->get_softirq_time)
- base->softirq_time = base->get_softirq_time();
- else if (gettime) {
+ if (gettime) {
hrtimer_get_softirq_time(cpu_base);
gettime = 0;
}
struct hrtimer *timer;
timer = rb_entry(node, struct hrtimer, node);
- if (base->softirq_time.tv64 <= timer->expires.tv64)
+ if (base->softirq_time.tv64 <=
+ hrtimer_get_expires_tv64(timer))
break;
if (timer->cb_mode == HRTIMER_CB_SOFTIRQ) {
do {
set_current_state(TASK_INTERRUPTIBLE);
- hrtimer_start(&t->timer, t->timer.expires, mode);
+ hrtimer_start_expires(&t->timer, mode);
if (!hrtimer_active(&t->timer))
t->task = NULL;
struct timespec rmt;
ktime_t rem;
- rem = ktime_sub(timer->expires, timer->base->get_time());
+ rem = hrtimer_expires_remaining(timer);
if (rem.tv64 <= 0)
return 0;
rmt = ktime_to_timespec(rem);
hrtimer_init_on_stack(&t.timer, restart->nanosleep.index,
HRTIMER_MODE_ABS);
- t.timer.expires.tv64 = restart->nanosleep.expires;
+ hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires);
if (do_nanosleep(&t, HRTIMER_MODE_ABS))
goto out;
struct restart_block *restart;
struct hrtimer_sleeper t;
int ret = 0;
+ unsigned long slack;
+
+ slack = current->timer_slack_ns;
+ if (rt_task(current))
+ slack = 0;
hrtimer_init_on_stack(&t.timer, clockid, mode);
- t.timer.expires = timespec_to_ktime(*rqtp);
+ hrtimer_set_expires_range_ns(&t.timer, timespec_to_ktime(*rqtp), slack);
if (do_nanosleep(&t, mode))
goto out;
restart->fn = hrtimer_nanosleep_restart;
restart->nanosleep.index = t.timer.base->index;
restart->nanosleep.rmtp = rmtp;
- restart->nanosleep.expires = t.timer.expires.tv64;
+ restart->nanosleep.expires = hrtimer_get_expires_tv64(&t.timer);
ret = -ERESTART_RESTARTBLOCK;
out:
new_base = &get_cpu_var(hrtimer_bases);
tick_cancel_sched_timer(cpu);
-
- local_irq_disable();
- spin_lock(&new_base->lock);
+ /*
+ * The caller is globally serialized and nobody else
+ * takes two locks at once, deadlock is not possible.
+ */
+ spin_lock_irq(&new_base->lock);
spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
raise = 1;
spin_unlock(&old_base->lock);
- spin_unlock(&new_base->lock);
- local_irq_enable();
+ spin_unlock_irq(&new_base->lock);
put_cpu_var(hrtimer_bases);
if (raise)
#endif
}
+ /**
+ * schedule_hrtimeout_range - sleep until timeout
+ * @expires: timeout value (ktime_t)
+ * @delta: slack in expires timeout (ktime_t)
+ * @mode: timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL
+ *
+ * Make the current task sleep until the given expiry time has
+ * elapsed. The routine will return immediately unless
+ * the current task state has been set (see set_current_state()).
+ *
+ * The @delta argument gives the kernel the freedom to schedule the
+ * actual wakeup to a time that is both power and performance friendly.
+ * The kernel give the normal best effort behavior for "@expires+@delta",
+ * but may decide to fire the timer earlier, but no earlier than @expires.
+ *
+ * You can set the task state as follows -
+ *
+ * %TASK_UNINTERRUPTIBLE - at least @timeout time is guaranteed to
+ * pass before the routine returns.
+ *
+ * %TASK_INTERRUPTIBLE - the routine may return early if a signal is
+ * delivered to the current task.
+ *
+ * The current task state is guaranteed to be TASK_RUNNING when this
+ * routine returns.
+ *
+ * Returns 0 when the timer has expired otherwise -EINTR
+ */
+ int __sched schedule_hrtimeout_range(ktime_t *expires, unsigned long delta,
+ const enum hrtimer_mode mode)
+ {
+ struct hrtimer_sleeper t;
+
+ /*
+ * Optimize when a zero timeout value is given. It does not
+ * matter whether this is an absolute or a relative time.
+ */
+ if (expires && !expires->tv64) {
+ __set_current_state(TASK_RUNNING);
+ return 0;
+ }
+
+ /*
+ * A NULL parameter means "inifinte"
+ */
+ if (!expires) {
+ schedule();
+ __set_current_state(TASK_RUNNING);
+ return -EINTR;
+ }
+
+ hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC, mode);
+ hrtimer_set_expires_range_ns(&t.timer, *expires, delta);
+
+ hrtimer_init_sleeper(&t, current);
+
+ hrtimer_start_expires(&t.timer, mode);
+ if (!hrtimer_active(&t.timer))
+ t.task = NULL;
+
+ if (likely(t.task))
+ schedule();
+
+ hrtimer_cancel(&t.timer);
+ destroy_hrtimer_on_stack(&t.timer);
+
+ __set_current_state(TASK_RUNNING);
+
+ return !t.task ? 0 : -EINTR;
+ }
+ EXPORT_SYMBOL_GPL(schedule_hrtimeout_range);
+
+ /**
+ * schedule_hrtimeout - sleep until timeout
+ * @expires: timeout value (ktime_t)
+ * @mode: timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL
+ *
+ * Make the current task sleep until the given expiry time has
+ * elapsed. The routine will return immediately unless
+ * the current task state has been set (see set_current_state()).
+ *
+ * You can set the task state as follows -
+ *
+ * %TASK_UNINTERRUPTIBLE - at least @timeout time is guaranteed to
+ * pass before the routine returns.
+ *
+ * %TASK_INTERRUPTIBLE - the routine may return early if a signal is
+ * delivered to the current task.
+ *
+ * The current task state is guaranteed to be TASK_RUNNING when this
+ * routine returns.
+ *
+ * Returns 0 when the timer has expired otherwise -EINTR
+ */
+ int __sched schedule_hrtimeout(ktime_t *expires,
+ const enum hrtimer_mode mode)
+ {
+ return schedule_hrtimeout_range(expires, 0, mode);
+ }
+ EXPORT_SYMBOL_GPL(schedule_hrtimeout);
return 0;
}
+/*
+ * Get monotonic time for posix timers
+ */
+static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec *tp)
+{
+ getrawmonotonic(tp);
+ return 0;
+}
+
/*
* Initialize everything, well, just everything in Posix clocks/timers ;)
*/
.clock_get = posix_ktime_get_ts,
.clock_set = do_posix_clock_nosettime,
};
+ struct k_clock clock_monotonic_raw = {
+ .clock_getres = hrtimer_get_res,
+ .clock_get = posix_get_monotonic_raw,
+ .clock_set = do_posix_clock_nosettime,
+ };
register_posix_clock(CLOCK_REALTIME, &clock_realtime);
register_posix_clock(CLOCK_MONOTONIC, &clock_monotonic);
+ register_posix_clock(CLOCK_MONOTONIC_RAW, &clock_monotonic_raw);
posix_timers_cache = kmem_cache_create("posix_timers_cache",
sizeof (struct k_itimer), 0, SLAB_PANIC,
int posix_timer_event(struct k_itimer *timr, int si_private)
{
+ int shared, ret;
/*
* FIXME: if ->sigq is queued we can race with
* dequeue_signal()->do_schedule_next_timer().
*/
timr->sigq->info.si_sys_private = si_private;
- timr->sigq->info.si_signo = timr->it_sigev_signo;
- timr->sigq->info.si_code = SI_TIMER;
- timr->sigq->info.si_tid = timr->it_id;
- timr->sigq->info.si_value = timr->it_sigev_value;
-
- if (timr->it_sigev_notify & SIGEV_THREAD_ID) {
- struct task_struct *leader;
- int ret = send_sigqueue(timr->sigq, timr->it_process, 0);
-
- if (likely(ret >= 0))
- return ret;
-
- timr->it_sigev_notify = SIGEV_SIGNAL;
- leader = timr->it_process->group_leader;
- put_task_struct(timr->it_process);
- timr->it_process = leader;
- }
-
- return send_sigqueue(timr->sigq, timr->it_process, 1);
+ shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID);
+ ret = send_sigqueue(timr->sigq, timr->it_process, shared);
+ /* If we failed to send the signal the timer stops. */
+ return ret > 0;
}
EXPORT_SYMBOL_GPL(posix_timer_event);
struct sigevent __user *timer_event_spec,
timer_t __user * created_timer_id)
{
- int error = 0;
- struct k_itimer *new_timer = NULL;
- int new_timer_id;
- struct task_struct *process = NULL;
- unsigned long flags;
+ struct k_itimer *new_timer;
+ int error, new_timer_id;
+ struct task_struct *process;
sigevent_t event;
int it_id_set = IT_ID_NOT_SET;
goto out;
}
spin_lock_irq(&idr_lock);
- error = idr_get_new(&posix_timers_id, (void *) new_timer,
- &new_timer_id);
+ error = idr_get_new(&posix_timers_id, new_timer, &new_timer_id);
spin_unlock_irq(&idr_lock);
- if (error == -EAGAIN)
- goto retry;
- else if (error) {
+ if (error) {
+ if (error == -EAGAIN)
+ goto retry;
/*
* Weird looking, but we return EAGAIN if the IDR is
* full (proper POSIX return value for this)
error = -EFAULT;
goto out;
}
- new_timer->it_sigev_notify = event.sigev_notify;
- new_timer->it_sigev_signo = event.sigev_signo;
- new_timer->it_sigev_value = event.sigev_value;
-
- read_lock(&tasklist_lock);
- if ((process = good_sigevent(&event))) {
- /*
- * We may be setting up this process for another
- * thread. It may be exiting. To catch this
- * case the we check the PF_EXITING flag. If
- * the flag is not set, the siglock will catch
- * him before it is too late (in exit_itimers).
- *
- * The exec case is a bit more invloved but easy
- * to code. If the process is in our thread
- * group (and it must be or we would not allow
- * it here) and is doing an exec, it will cause
- * us to be killed. In this case it will wait
- * for us to die which means we can finish this
- * linkage with our last gasp. I.e. no code :)
- */
- spin_lock_irqsave(&process->sighand->siglock, flags);
- if (!(process->flags & PF_EXITING)) {
- new_timer->it_process = process;
- list_add(&new_timer->list,
- &process->signal->posix_timers);
- if (new_timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
- get_task_struct(process);
- spin_unlock_irqrestore(&process->sighand->siglock, flags);
- } else {
- spin_unlock_irqrestore(&process->sighand->siglock, flags);
- process = NULL;
- }
- }
- read_unlock(&tasklist_lock);
+ rcu_read_lock();
+ process = good_sigevent(&event);
+ if (process)
+ get_task_struct(process);
+ rcu_read_unlock();
if (!process) {
error = -EINVAL;
goto out;
}
} else {
- new_timer->it_sigev_notify = SIGEV_SIGNAL;
- new_timer->it_sigev_signo = SIGALRM;
- new_timer->it_sigev_value.sival_int = new_timer->it_id;
+ event.sigev_notify = SIGEV_SIGNAL;
+ event.sigev_signo = SIGALRM;
+ event.sigev_value.sival_int = new_timer->it_id;
process = current->group_leader;
- spin_lock_irqsave(&process->sighand->siglock, flags);
- new_timer->it_process = process;
- list_add(&new_timer->list, &process->signal->posix_timers);
- spin_unlock_irqrestore(&process->sighand->siglock, flags);
+ get_task_struct(process);
}
+ new_timer->it_sigev_notify = event.sigev_notify;
+ new_timer->sigq->info.si_signo = event.sigev_signo;
+ new_timer->sigq->info.si_value = event.sigev_value;
+ new_timer->sigq->info.si_tid = new_timer->it_id;
+ new_timer->sigq->info.si_code = SI_TIMER;
+
+ spin_lock_irq(¤t->sighand->siglock);
+ new_timer->it_process = process;
+ list_add(&new_timer->list, ¤t->signal->posix_timers);
+ spin_unlock_irq(¤t->sighand->siglock);
+
+ return 0;
/*
* In the case of the timer belonging to another task, after
* the task is unlocked, the timer is owned by the other task
* and may cease to exist at any time. Don't use or modify
* new_timer after the unlock call.
*/
-
out:
- if (error)
- release_posix_timer(new_timer, it_id_set);
-
+ release_posix_timer(new_timer, it_id_set);
return error;
}
* the find to the timer lock. To avoid a dead lock, the timer id MUST
* be release with out holding the timer lock.
*/
-static struct k_itimer * lock_timer(timer_t timer_id, unsigned long *flags)
+static struct k_itimer *lock_timer(timer_t timer_id, unsigned long *flags)
{
struct k_itimer *timr;
/*
* flags part over to the timer lock. Must not let interrupts in
* while we are moving the lock.
*/
-
spin_lock_irqsave(&idr_lock, *flags);
- timr = (struct k_itimer *) idr_find(&posix_timers_id, (int) timer_id);
+ timr = idr_find(&posix_timers_id, (int)timer_id);
if (timr) {
spin_lock(&timr->it_lock);
-
- if ((timr->it_id != timer_id) || !(timr->it_process) ||
- !same_thread_group(timr->it_process, current)) {
- spin_unlock(&timr->it_lock);
- spin_unlock_irqrestore(&idr_lock, *flags);
- timr = NULL;
- } else
+ if (timr->it_process &&
+ same_thread_group(timr->it_process, current)) {
spin_unlock(&idr_lock);
- } else
- spin_unlock_irqrestore(&idr_lock, *flags);
+ return timr;
+ }
+ spin_unlock(&timr->it_lock);
+ }
+ spin_unlock_irqrestore(&idr_lock, *flags);
- return timr;
+ return NULL;
}
/*
(timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE))
timr->it_overrun += (unsigned int) hrtimer_forward(timer, now, iv);
- remaining = ktime_sub(timer->expires, now);
+ remaining = ktime_sub(hrtimer_get_expires(timer), now);
/* Return 0 only, when the timer is expired and not pending */
if (remaining.tv64 <= 0) {
/*
hrtimer_init(&timr->it.real.timer, timr->it_clock, mode);
timr->it.real.timer.function = posix_timer_fn;
- timer->expires = timespec_to_ktime(new_setting->it_value);
+ hrtimer_set_expires(timer, timespec_to_ktime(new_setting->it_value));
/* Convert interval */
timr->it.real.interval = timespec_to_ktime(new_setting->it_interval);
if (((timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) {
/* Setup correct expiry time for relative timers */
if (mode == HRTIMER_MODE_REL) {
- timer->expires =
- ktime_add_safe(timer->expires,
- timer->base->get_time());
+ hrtimer_add_expires(timer, timer->base->get_time());
}
return 0;
}
- hrtimer_start(timer, timer->expires, mode);
+ hrtimer_start_expires(timer, mode);
return 0;
}
* This keeps any tasks waiting on the spin lock from thinking
* they got something (see the lock code above).
*/
- if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
- put_task_struct(timer->it_process);
+ put_task_struct(timer->it_process);
timer->it_process = NULL;
unlock_timer(timer, flags);
* This keeps any tasks waiting on the spin lock from thinking
* they got something (see the lock code above).
*/
- if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
- put_task_struct(timer->it_process);
+ put_task_struct(timer->it_process);
timer->it_process = NULL;
unlock_timer(timer, flags);
#include <linux/debugfs.h>
#include <linux/ctype.h>
#include <linux/ftrace.h>
+#include <trace/sched.h>
#include <asm/tlb.h>
#include <asm/irq_regs.h>
now = hrtimer_cb_get_time(&rt_b->rt_period_timer);
hrtimer_forward(&rt_b->rt_period_timer, now, rt_b->rt_period);
- hrtimer_start(&rt_b->rt_period_timer,
- rt_b->rt_period_timer.expires,
- HRTIMER_MODE_ABS);
+ hrtimer_start_expires(&rt_b->rt_period_timer,
+ HRTIMER_MODE_ABS);
}
spin_unlock(&rt_b->rt_runtime_lock);
}
struct hrtimer *timer = &rq->hrtick_timer;
ktime_t time = ktime_add_ns(timer->base->get_time(), delay);
- timer->expires = time;
+ hrtimer_set_expires(timer, time);
if (rq == this_rq()) {
hrtimer_restart(timer);
* just go back and repeat.
*/
rq = task_rq_lock(p, &flags);
+ trace_sched_wait_task(rq, p);
running = task_running(rq, p);
on_rq = p->se.on_rq;
ncsw = 0;
success = 1;
out_running:
- trace_mark(kernel_sched_wakeup,
- "pid %d state %ld ## rq %p task %p rq->curr %p",
- p->pid, p->state, rq, p, rq->curr);
+ trace_sched_wakeup(rq, p);
check_preempt_curr(rq, p, sync);
p->state = TASK_RUNNING;
p->sched_class->task_new(rq, p);
inc_nr_running(rq);
}
- trace_mark(kernel_sched_wakeup_new,
- "pid %d state %ld ## rq %p task %p rq->curr %p",
- p->pid, p->state, rq, p, rq->curr);
+ trace_sched_wakeup_new(rq, p);
check_preempt_curr(rq, p, 0);
#ifdef CONFIG_SMP
if (p->sched_class->task_wake_up)
struct mm_struct *mm, *oldmm;
prepare_task_switch(rq, prev, next);
- trace_mark(kernel_sched_schedule,
- "prev_pid %d next_pid %d prev_state %ld "
- "## rq %p prev %p next %p",
- prev->pid, next->pid, prev->state,
- rq, prev, next);
+ trace_sched_switch(rq, prev, next);
mm = next->mm;
oldmm = prev->active_mm;
/*
|| unlikely(!cpu_active(dest_cpu)))
goto out;
+ trace_sched_migrate_task(rq, p, dest_cpu);
/* force the process onto the specified CPU */
if (migrate_task(p, dest_cpu, &req)) {
/* Need to wait for migration thread (might exit: take ref). */
EXPORT_PER_CPU_SYMBOL(kstat);
/*
- * Return p->sum_exec_runtime plus any more ns on the sched_clock
- * that have not yet been banked in case the task is currently running.
+ * Return any ns on the sched_clock that have not yet been banked in
+ * @p in case that task is currently running.
*/
-unsigned long long task_sched_runtime(struct task_struct *p)
+unsigned long long task_delta_exec(struct task_struct *p)
{
unsigned long flags;
- u64 ns, delta_exec;
struct rq *rq;
+ u64 ns = 0;
rq = task_rq_lock(p, &flags);
- ns = p->se.sum_exec_runtime;
+
if (task_current(rq, p)) {
+ u64 delta_exec;
+
update_rq_clock(rq);
delta_exec = rq->clock - p->se.exec_start;
if ((s64)delta_exec > 0)
- ns += delta_exec;
+ ns = delta_exec;
}
+
task_rq_unlock(rq, &flags);
return ns;
cputime64_t tmp;
p->utime = cputime_add(p->utime, cputime);
+ account_group_user_time(p, cputime);
/* Add user time to cpustat. */
tmp = cputime_to_cputime64(cputime);
tmp = cputime_to_cputime64(cputime);
p->utime = cputime_add(p->utime, cputime);
+ account_group_user_time(p, cputime);
p->gtime = cputime_add(p->gtime, cputime);
cpustat->user = cputime64_add(cpustat->user, tmp);
}
p->stime = cputime_add(p->stime, cputime);
+ account_group_system_time(p, cputime);
/* Add system time to cpustat. */
tmp = cputime_to_cputime64(cputime);
if (p == rq->idle) {
p->stime = cputime_add(p->stime, steal);
+ account_group_system_time(p, steal);
if (atomic_read(&rq->nr_iowait) > 0)
cpustat->iowait = cputime64_add(cpustat->iowait, tmp);
else
return old_fsgid;
}
+void do_sys_times(struct tms *tms)
+{
+ struct task_cputime cputime;
+ cputime_t cutime, cstime;
+
+ spin_lock_irq(¤t->sighand->siglock);
+ thread_group_cputime(current, &cputime);
+ cutime = current->signal->cutime;
+ cstime = current->signal->cstime;
+ spin_unlock_irq(¤t->sighand->siglock);
+ tms->tms_utime = cputime_to_clock_t(cputime.utime);
+ tms->tms_stime = cputime_to_clock_t(cputime.stime);
+ tms->tms_cutime = cputime_to_clock_t(cutime);
+ tms->tms_cstime = cputime_to_clock_t(cstime);
+}
+
asmlinkage long sys_times(struct tms __user * tbuf)
{
- /*
- * In the SMP world we might just be unlucky and have one of
- * the times increment as we use it. Since the value is an
- * atomically safe type this is just fine. Conceptually its
- * as if the syscall took an instant longer to occur.
- */
if (tbuf) {
struct tms tmp;
- struct task_struct *tsk = current;
- struct task_struct *t;
- cputime_t utime, stime, cutime, cstime;
-
- spin_lock_irq(&tsk->sighand->siglock);
- utime = tsk->signal->utime;
- stime = tsk->signal->stime;
- t = tsk;
- do {
- utime = cputime_add(utime, t->utime);
- stime = cputime_add(stime, t->stime);
- t = next_thread(t);
- } while (t != tsk);
-
- cutime = tsk->signal->cutime;
- cstime = tsk->signal->cstime;
- spin_unlock_irq(&tsk->sighand->siglock);
-
- tmp.tms_utime = cputime_to_clock_t(utime);
- tmp.tms_stime = cputime_to_clock_t(stime);
- tmp.tms_cutime = cputime_to_clock_t(cutime);
- tmp.tms_cstime = cputime_to_clock_t(cstime);
+
+ do_sys_times(&tmp);
if (copy_to_user(tbuf, &tmp, sizeof(struct tms)))
return -EFAULT;
}
asmlinkage long sys_setrlimit(unsigned int resource, struct rlimit __user *rlim)
{
struct rlimit new_rlim, *old_rlim;
- unsigned long it_prof_secs;
int retval;
if (resource >= RLIM_NLIMITS)
if (new_rlim.rlim_cur == RLIM_INFINITY)
goto out;
- it_prof_secs = cputime_to_secs(current->signal->it_prof_expires);
- if (it_prof_secs == 0 || new_rlim.rlim_cur <= it_prof_secs) {
- unsigned long rlim_cur = new_rlim.rlim_cur;
- cputime_t cputime;
-
- cputime = secs_to_cputime(rlim_cur);
- read_lock(&tasklist_lock);
- spin_lock_irq(¤t->sighand->siglock);
- set_process_cpu_timer(current, CPUCLOCK_PROF, &cputime, NULL);
- spin_unlock_irq(¤t->sighand->siglock);
- read_unlock(&tasklist_lock);
- }
+ update_rlimit_cpu(new_rlim.rlim_cur);
out:
return 0;
}
*
*/
-static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r,
- cputime_t *utimep, cputime_t *stimep)
+static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r)
{
- *utimep = cputime_add(*utimep, t->utime);
- *stimep = cputime_add(*stimep, t->stime);
r->ru_nvcsw += t->nvcsw;
r->ru_nivcsw += t->nivcsw;
r->ru_minflt += t->min_flt;
struct task_struct *t;
unsigned long flags;
cputime_t utime, stime;
+ struct task_cputime cputime;
memset((char *) r, 0, sizeof *r);
utime = stime = cputime_zero;
if (who == RUSAGE_THREAD) {
- accumulate_thread_rusage(p, r, &utime, &stime);
+ accumulate_thread_rusage(p, r);
goto out;
}
break;
case RUSAGE_SELF:
- utime = cputime_add(utime, p->signal->utime);
- stime = cputime_add(stime, p->signal->stime);
+ thread_group_cputime(p, &cputime);
+ utime = cputime_add(utime, cputime.utime);
+ stime = cputime_add(stime, cputime.stime);
r->ru_nvcsw += p->signal->nvcsw;
r->ru_nivcsw += p->signal->nivcsw;
r->ru_minflt += p->signal->min_flt;
r->ru_oublock += p->signal->oublock;
t = p;
do {
- accumulate_thread_rusage(t, r, &utime, &stime);
+ accumulate_thread_rusage(t, r);
t = next_thread(t);
} while (t != p);
break;
case PR_SET_TSC:
error = SET_TSC_CTL(arg2);
break;
+ case PR_GET_TIMERSLACK:
+ error = current->timer_slack_ns;
+ break;
+ case PR_SET_TIMERSLACK:
+ if (arg2 <= 0)
+ current->timer_slack_ns =
+ current->default_timer_slack_ns;
+ else
+ current->timer_slack_ns = arg2;
+ break;
default:
error = -EINVAL;
break;
#include <linux/mm.h>
#include <linux/time.h>
-#include <linux/timer.h>
#include <linux/timex.h>
#include <linux/jiffies.h>
#include <linux/hrtimer.h>
#include <linux/capability.h>
#include <linux/math64.h>
#include <linux/clocksource.h>
+#include <linux/workqueue.h>
#include <asm/timex.h>
/*
time_state = TIME_OOP;
printk(KERN_NOTICE "Clock: "
"inserting leap second 23:59:60 UTC\n");
- leap_timer.expires = ktime_add_ns(leap_timer.expires,
- NSEC_PER_SEC);
+ hrtimer_add_expires_ns(&leap_timer, NSEC_PER_SEC);
res = HRTIMER_RESTART;
break;
case TIME_DEL:
/* Disable the cmos update - used by virtualization and embedded */
int no_sync_cmos_clock __read_mostly;
-static void sync_cmos_clock(unsigned long dummy);
+static void sync_cmos_clock(struct work_struct *work);
-static DEFINE_TIMER(sync_cmos_timer, sync_cmos_clock, 0, 0);
+static DECLARE_DELAYED_WORK(sync_cmos_work, sync_cmos_clock);
-static void sync_cmos_clock(unsigned long dummy)
+static void sync_cmos_clock(struct work_struct *work)
{
struct timespec now, next;
int fail = 1;
next.tv_sec++;
next.tv_nsec -= NSEC_PER_SEC;
}
- mod_timer(&sync_cmos_timer, jiffies + timespec_to_jiffies(&next));
+ schedule_delayed_work(&sync_cmos_work, timespec_to_jiffies(&next));
}
static void notify_cmos_timer(void)
{
if (!no_sync_cmos_clock)
- mod_timer(&sync_cmos_timer, jiffies + 1);
+ schedule_delayed_work(&sync_cmos_work, 0);
}
#else
int do_adjtimex(struct timex *txc)
{
struct timespec ts;
- long save_adjust, sec;
int result;
- /* In order to modify anything, you gotta be super-user! */
- if (txc->modes && !capable(CAP_SYS_TIME))
- return -EPERM;
-
- /* Now we validate the data before disabling interrupts */
-
- if ((txc->modes & ADJ_OFFSET_SINGLESHOT) == ADJ_OFFSET_SINGLESHOT) {
+ /* Validate the data before disabling interrupts */
+ if (txc->modes & ADJ_ADJTIME) {
/* singleshot must not be used with any other mode bits */
- if (txc->modes & ~ADJ_OFFSET_SS_READ)
+ if (!(txc->modes & ADJ_OFFSET_SINGLESHOT))
return -EINVAL;
+ if (!(txc->modes & ADJ_OFFSET_READONLY) &&
+ !capable(CAP_SYS_TIME))
+ return -EPERM;
+ } else {
+ /* In order to modify anything, you gotta be super-user! */
+ if (txc->modes && !capable(CAP_SYS_TIME))
+ return -EPERM;
+
+ /* if the quartz is off by more than 10% something is VERY wrong! */
+ if (txc->modes & ADJ_TICK &&
+ (txc->tick < 900000/USER_HZ ||
+ txc->tick > 1100000/USER_HZ))
+ return -EINVAL;
+
+ if (txc->modes & ADJ_STATUS && time_state != TIME_OK)
+ hrtimer_cancel(&leap_timer);
}
- /* if the quartz is off by more than 10% something is VERY wrong ! */
- if (txc->modes & ADJ_TICK)
- if (txc->tick < 900000/USER_HZ ||
- txc->tick > 1100000/USER_HZ)
- return -EINVAL;
-
- if (time_state != TIME_OK && txc->modes & ADJ_STATUS)
- hrtimer_cancel(&leap_timer);
getnstimeofday(&ts);
write_seqlock_irq(&xtime_lock);
- /* Save for later - semantics of adjtime is to return old value */
- save_adjust = time_adjust;
-
/* If there are input parameters, then process them */
+ if (txc->modes & ADJ_ADJTIME) {
+ long save_adjust = time_adjust;
+
+ if (!(txc->modes & ADJ_OFFSET_READONLY)) {
+ /* adjtime() is independent from ntp_adjtime() */
+ time_adjust = txc->offset;
+ ntp_update_frequency();
+ }
+ txc->offset = save_adjust;
+ goto adj_done;
+ }
if (txc->modes) {
+ long sec;
+
if (txc->modes & ADJ_STATUS) {
if ((time_status & STA_PLL) &&
!(txc->status & STA_PLL)) {
if (txc->modes & ADJ_TAI && txc->constant > 0)
time_tai = txc->constant;
- if (txc->modes & ADJ_OFFSET) {
- if (txc->modes == ADJ_OFFSET_SINGLESHOT)
- /* adjtime() is independent from ntp_adjtime() */
- time_adjust = txc->offset;
- else
- ntp_update_offset(txc->offset);
- }
+ if (txc->modes & ADJ_OFFSET)
+ ntp_update_offset(txc->offset);
if (txc->modes & ADJ_TICK)
tick_usec = txc->tick;
ntp_update_frequency();
}
+ txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
+ NTP_SCALE_SHIFT);
+ if (!(time_status & STA_NANO))
+ txc->offset /= NSEC_PER_USEC;
+
+adj_done:
result = time_state; /* mostly `TIME_OK' */
if (time_status & (STA_UNSYNC|STA_CLOCKERR))
result = TIME_ERROR;
- if ((txc->modes == ADJ_OFFSET_SINGLESHOT) ||
- (txc->modes == ADJ_OFFSET_SS_READ))
- txc->offset = save_adjust;
- else {
- txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
- NTP_SCALE_SHIFT);
- if (!(time_status & STA_NANO))
- txc->offset /= NSEC_PER_USEC;
- }
- txc->freq = shift_right((s32)(time_freq >> PPM_SCALE_INV_SHIFT) *
- (s64)PPM_SCALE_INV,
- NTP_SCALE_SHIFT);
+ txc->freq = shift_right((time_freq >> PPM_SCALE_INV_SHIFT) *
+ (s64)PPM_SCALE_INV, NTP_SCALE_SHIFT);
txc->maxerror = time_maxerror;
txc->esterror = time_esterror;
txc->status = time_status;
touch_softlockup_watchdog();
}
-void tick_nohz_stop_idle(int cpu)
+static void tick_nohz_stop_idle(int cpu)
{
struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
goto out;
}
- ts->idle_tick = ts->sched_timer.expires;
+ ts->idle_tick = hrtimer_get_expires(&ts->sched_timer);
ts->tick_stopped = 1;
ts->idle_jiffies = last_jiffies;
rcu_enter_nohz();
return ts->sleep_length;
}
- ts->sched_timer.expires = ts->idle_tick;
+static void tick_nohz_restart(struct tick_sched *ts, ktime_t now)
+{
+ hrtimer_cancel(&ts->sched_timer);
- hrtimer_start(&ts->sched_timer,
- ts->sched_timer.expires,
++ hrtimer_set_expires(&ts->sched_timer, ts->idle_tick);
+
+ while (1) {
+ /* Forward the time to expire in the future */
+ hrtimer_forward(&ts->sched_timer, now, tick_period);
+
+ if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
- if (!tick_program_event(ts->sched_timer.expires, 0))
++ hrtimer_start_expires(&ts->sched_timer,
+ HRTIMER_MODE_ABS);
+ /* Check, if the timer was already in the past */
+ if (hrtimer_active(&ts->sched_timer))
+ break;
+ } else {
++ if (!tick_program_event(
++ hrtimer_get_expires(&ts->sched_timer), 0))
+ break;
+ }
+ /* Update jiffies and reread time */
+ tick_do_update_jiffies64(now);
+ now = ktime_get();
+ }
+}
+
/**
* tick_nohz_restart_sched_tick - restart the idle tick from the idle task
*
*/
ts->tick_stopped = 0;
ts->idle_exittime = now;
- hrtimer_cancel(&ts->sched_timer);
- hrtimer_set_expires(&ts->sched_timer, ts->idle_tick);
+
- while (1) {
- /* Forward the time to expire in the future */
- hrtimer_forward(&ts->sched_timer, now, tick_period);
+ tick_nohz_restart(ts, now);
+
- if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
- hrtimer_start_expires(&ts->sched_timer,
- HRTIMER_MODE_ABS);
- /* Check, if the timer was already in the past */
- if (hrtimer_active(&ts->sched_timer))
- break;
- } else {
- if (!tick_program_event(
- hrtimer_get_expires(&ts->sched_timer), 0))
- break;
- }
- /* Update jiffies and reread time */
- tick_do_update_jiffies64(now);
- now = ktime_get();
- }
local_irq_enable();
}
static int tick_nohz_reprogram(struct tick_sched *ts, ktime_t now)
{
hrtimer_forward(&ts->sched_timer, now, tick_period);
- return tick_program_event(ts->sched_timer.expires, 0);
+ return tick_program_event(hrtimer_get_expires(&ts->sched_timer), 0);
}
/*
update_process_times(user_mode(regs));
profile_tick(CPU_PROFILING);
- /* Do not restart, when we are in the idle loop */
- if (ts->tick_stopped)
- return;
-
while (tick_nohz_reprogram(ts, now)) {
now = ktime_get();
tick_do_update_jiffies64(now);
next = tick_init_jiffy_update();
for (;;) {
- ts->sched_timer.expires = next;
+ hrtimer_set_expires(&ts->sched_timer, next);
if (!tick_program_event(next, 0))
break;
next = ktime_add(next, tick_period);
smp_processor_id());
}
- delta = ktime_sub(ts->sched_timer.expires, now);
+/*
+ * When NOHZ is enabled and the tick is stopped, we need to kick the
+ * tick timer from irq_enter() so that the jiffies update is kept
+ * alive during long running softirqs. That's ugly as hell, but
+ * correctness is key even if we need to fix the offending softirq in
+ * the first place.
+ *
+ * Note, this is different to tick_nohz_restart. We just kick the
+ * timer and do not touch the other magic bits which need to be done
+ * when idle is left.
+ */
+static void tick_nohz_kick_tick(int cpu)
+{
+ struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
+ ktime_t delta, now;
+
+ if (!ts->tick_stopped)
+ return;
+
+ /*
+ * Do not touch the tick device, when the next expiry is either
+ * already reached or less/equal than the tick period.
+ */
+ now = ktime_get();
++ delta = ktime_sub(hrtimer_get_expires(&ts->sched_timer), now);
+ if (delta.tv64 <= tick_period.tv64)
+ return;
+
+ tick_nohz_restart(ts, now);
+}
+
#else
static inline void tick_nohz_switch_to_nohz(void) { }
#endif /* NO_HZ */
+/*
+ * Called from irq_enter to notify about the possible interruption of idle()
+ */
+void tick_check_idle(int cpu)
+{
+ tick_check_oneshot_broadcast(cpu);
+#ifdef CONFIG_NO_HZ
+ tick_nohz_stop_idle(cpu);
+ tick_nohz_update_jiffies();
+ tick_nohz_kick_tick(cpu);
+#endif
+}
+
/*
* High resolution timer specific code
*/
profile_tick(CPU_PROFILING);
}
- /* Do not restart, when we are in the idle loop */
- if (ts->tick_stopped)
- return HRTIMER_NORESTART;
-
hrtimer_forward(timer, now, tick_period);
return HRTIMER_RESTART;
ts->sched_timer.cb_mode = HRTIMER_CB_IRQSAFE_PERCPU;
/* Get the next period (per cpu) */
- ts->sched_timer.expires = tick_init_jiffy_update();
+ hrtimer_set_expires(&ts->sched_timer, tick_init_jiffy_update());
offset = ktime_to_ns(tick_period) >> 1;
do_div(offset, num_possible_cpus());
offset *= smp_processor_id();
- ts->sched_timer.expires = ktime_add_ns(ts->sched_timer.expires, offset);
+ hrtimer_add_expires_ns(&ts->sched_timer, offset);
for (;;) {
hrtimer_forward(&ts->sched_timer, now, tick_period);
- hrtimer_start(&ts->sched_timer, ts->sched_timer.expires,
- HRTIMER_MODE_ABS);
+ hrtimer_start_expires(&ts->sched_timer, HRTIMER_MODE_ABS);
/* Check, if the timer was already in the past */
if (hrtimer_active(&ts->sched_timer))
break;
}
static void
-print_timer(struct seq_file *m, struct hrtimer *timer, int idx, u64 now)
+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, timer);
+ print_name_offset(m, taddr);
SEQ_printf(m, ", ");
print_name_offset(m, timer->function);
SEQ_printf(m, ", S:%02lx", timer->state);
SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
#endif
SEQ_printf(m, "\n");
- SEQ_printf(m, " # expires at %Lu nsecs [in %Ld nsecs]\n",
- (unsigned long long)ktime_to_ns(timer->expires),
- (long long)(ktime_to_ns(timer->expires) - now));
+ SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
+ (unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
+ (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
+ (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
+ (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
}
static void
tmp = *timer;
spin_unlock_irqrestore(&base->cpu_base->lock, flags);
- print_timer(m, &tmp, i, now);
+ print_timer(m, timer, &tmp, i, now);
next++;
goto next_one;
}
static void
print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
{
+ SEQ_printf(m, " .base: %p\n", base);
SEQ_printf(m, " .index: %d\n",
base->index);
SEQ_printf(m, " .resolution: %Lu nsecs\n",
#ifdef CONFIG_GENERIC_CLOCKEVENTS
static void
-print_tickdevice(struct seq_file *m, struct tick_device *td)
+print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
{
struct clock_event_device *dev = td->evtdev;
SEQ_printf(m, "\n");
SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
+ if (cpu < 0)
+ SEQ_printf(m, "Broadcast device\n");
+ else
+ SEQ_printf(m, "Per CPU device: %d\n", cpu);
SEQ_printf(m, "Clock Event Device: ");
if (!dev) {
int cpu;
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
- print_tickdevice(m, tick_get_broadcast_device());
+ print_tickdevice(m, tick_get_broadcast_device(), -1);
SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
tick_get_broadcast_mask()->bits[0]);
#ifdef CONFIG_TICK_ONESHOT
SEQ_printf(m, "\n");
#endif
for_each_online_cpu(cpu)
- print_tickdevice(m, tick_get_device(cpu));
+ print_tickdevice(m, tick_get_device(cpu), cpu);
SEQ_printf(m, "\n");
}
#else
u64 now = ktime_to_ns(ktime_get());
int cpu;
- SEQ_printf(m, "Timer List Version: v0.3\n");
+ SEQ_printf(m, "Timer List Version: v0.4\n");
SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
projects / linux-2.6-omap-h63xx.git / commitdiff