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Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

Browse source 
* 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  itimers: Add tracepoints for itimer
  hrtimer: Add tracepoint for hrtimers
  timers: Add tracepoints for timer_list timers
  cputime: Optimize jiffies_to_cputime(1)
  itimers: Simplify arm_timer() code a bit
  itimers: Fix periodic tics precision
  itimers: Merge ITIMER_VIRT and ITIMER_PROF

Trivial header file include conflicts in kernel/fork.c
This commit is contained in:
Linus Torvalds 2009-09-23 09:46:15 -07:00
commit 31bbb9b58d
13 changed files with 620 additions and 172 deletions
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1
arch/ia64/include/asm/cputime.h
View file

@ -30,6 +30,7 @@ typedef u64 cputime_t;
typedef u64 cputime64_t;
#define cputime_zero ((cputime_t)0)
#define cputime_one_jiffy jiffies_to_cputime(1)
#define cputime_max ((~((cputime_t)0) >> 1) - 1)
#define cputime_add(__a, __b) ((__a) + (__b))
#define cputime_sub(__a, __b) ((__a) - (__b))

13
arch/powerpc/include/asm/cputime.h
View file

@ -18,6 +18,9 @@
#ifndef CONFIG_VIRT_CPU_ACCOUNTING
#include <asm-generic/cputime.h>
#ifdef __KERNEL__
static inline void setup_cputime_one_jiffy(void) { }
#endif
#else
#include <linux/types.h>
@ -48,6 +51,11 @@ typedef u64 cputime64_t;
#ifdef __KERNEL__
/*
* One jiffy in timebase units computed during initialization
*/
extern cputime_t cputime_one_jiffy;
/*
* Convert cputime <-> jiffies
*/
@ -89,6 +97,11 @@ static inline cputime_t jiffies_to_cputime(const unsigned long jif)
return ct;
}
static inline void setup_cputime_one_jiffy(void)
{
cputime_one_jiffy = jiffies_to_cputime(1);
}
static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
{
cputime_t ct;

4
arch/powerpc/kernel/time.c
View file

@ -193,6 +193,8 @@ EXPORT_SYMBOL(__cputime_clockt_factor);
DEFINE_PER_CPU(unsigned long, cputime_last_delta);
DEFINE_PER_CPU(unsigned long, cputime_scaled_last_delta);
cputime_t cputime_one_jiffy;
static void calc_cputime_factors(void)
{
struct div_result res;
@ -501,6 +503,7 @@ static int __init iSeries_tb_recal(void)
tb_to_xs = divres.result_low;
vdso_data->tb_ticks_per_sec = tb_ticks_per_sec;
vdso_data->tb_to_xs = tb_to_xs;
setup_cputime_one_jiffy();
}
else {
printk( "Titan recalibrate: FAILED (difference > 4 percent)\n"
@ -960,6 +963,7 @@ void __init time_init(void)
tb_ticks_per_usec = ppc_tb_freq / 1000000;
tb_to_us = mulhwu_scale_factor(ppc_tb_freq, 1000000);
calc_cputime_factors();
setup_cputime_one_jiffy();
/*
* Calculate the length of each tick in ns. It will not be

1
arch/s390/include/asm/cputime.h
View file

@ -42,6 +42,7 @@ __div(unsigned long long n, unsigned int base)
#endif /* __s390x__ */
#define cputime_zero (0ULL)
#define cputime_one_jiffy jiffies_to_cputime(1)
#define cputime_max ((~0UL >> 1) - 1)
#define cputime_add(__a, __b) ((__a) + (__b))
#define cputime_sub(__a, __b) ((__a) - (__b))

1
include/asm-generic/cputime.h
View file

@ -7,6 +7,7 @@
typedef unsigned long cputime_t;
#define cputime_zero (0UL)
#define cputime_one_jiffy jiffies_to_cputime(1)
#define cputime_max ((~0UL >> 1) - 1)
#define cputime_add(__a, __b) ((__a) + (__b))
#define cputime_sub(__a, __b) ((__a) - (__b))

16
include/linux/sched.h
View file

@ -493,6 +493,13 @@ struct pacct_struct {
unsigned long ac_minflt, ac_majflt;
};
struct cpu_itimer {
cputime_t expires;
cputime_t incr;
u32 error;
u32 incr_error;
};
/**
* struct task_cputime - collected CPU time counts
* @utime: time spent in user mode, in &cputime_t units
@ -587,9 +594,12 @@ struct signal_struct {
struct pid *leader_pid;
ktime_t it_real_incr;
/* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
cputime_t it_prof_expires, it_virt_expires;
cputime_t it_prof_incr, it_virt_incr;
/*
* ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
* CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
* values are defined to 0 and 1 respectively
*/
struct cpu_itimer it[2];
/*
* Thread group totals for process CPU timers.

342
include/trace/events/timer.h Normal file
View file

@ -0,0 +1,342 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM timer
#if !defined(_TRACE_TIMER_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_TIMER_H
#include <linux/tracepoint.h>
#include <linux/hrtimer.h>
#include <linux/timer.h>
/**
* timer_init - called when the timer is initialized
* @timer: pointer to struct timer_list
*/
TRACE_EVENT(timer_init,
TP_PROTO(struct timer_list *timer),
TP_ARGS(timer),
TP_STRUCT__entry(
__field( void *, timer )
),
TP_fast_assign(
__entry->timer = timer;
),
TP_printk("timer %p", __entry->timer)
);
/**
* timer_start - called when the timer is started
* @timer: pointer to struct timer_list
* @expires: the timers expiry time
*/
TRACE_EVENT(timer_start,
TP_PROTO(struct timer_list *timer, unsigned long expires),
TP_ARGS(timer, expires),
TP_STRUCT__entry(
__field( void *, timer )
__field( void *, function )
__field( unsigned long, expires )
__field( unsigned long, now )
),
TP_fast_assign(
__entry->timer = timer;
__entry->function = timer->function;
__entry->expires = expires;
__entry->now = jiffies;
),
TP_printk("timer %p: func %pf, expires %lu, timeout %ld",
__entry->timer, __entry->function, __entry->expires,
(long)__entry->expires - __entry->now)
);
/**
* timer_expire_entry - called immediately before the timer callback
* @timer: pointer to struct timer_list
*
* Allows to determine the timer latency.
*/
TRACE_EVENT(timer_expire_entry,
TP_PROTO(struct timer_list *timer),
TP_ARGS(timer),
TP_STRUCT__entry(
__field( void *, timer )
__field( unsigned long, now )
),
TP_fast_assign(
__entry->timer = timer;
__entry->now = jiffies;
),
TP_printk("timer %p: now %lu", __entry->timer, __entry->now)
);
/**
* timer_expire_exit - called immediately after the timer callback returns
* @timer: pointer to struct timer_list
*
* When used in combination with the timer_expire_entry tracepoint we can
* determine the runtime of the timer callback function.
*
* NOTE: Do NOT derefernce timer in TP_fast_assign. The pointer might
* be invalid. We solely track the pointer.
*/
TRACE_EVENT(timer_expire_exit,
TP_PROTO(struct timer_list *timer),
TP_ARGS(timer),
TP_STRUCT__entry(
__field(void *, timer )
),
TP_fast_assign(
__entry->timer = timer;
),
TP_printk("timer %p", __entry->timer)
);
/**
* timer_cancel - called when the timer is canceled
* @timer: pointer to struct timer_list
*/
TRACE_EVENT(timer_cancel,
TP_PROTO(struct timer_list *timer),
TP_ARGS(timer),
TP_STRUCT__entry(
__field( void *, timer )
),
TP_fast_assign(
__entry->timer = timer;
),
TP_printk("timer %p", __entry->timer)
);
/**
* hrtimer_init - called when the hrtimer is initialized
* @timer: pointer to struct hrtimer
* @clockid: the hrtimers clock
* @mode: the hrtimers mode
*/
TRACE_EVENT(hrtimer_init,
TP_PROTO(struct hrtimer *timer, clockid_t clockid,
enum hrtimer_mode mode),
TP_ARGS(timer, clockid, mode),
TP_STRUCT__entry(
__field( void *, timer )
__field( clockid_t, clockid )
__field( enum hrtimer_mode, mode )
),
TP_fast_assign(
__entry->timer = timer;
__entry->clockid = clockid;
__entry->mode = mode;
),
TP_printk("hrtimer %p, clockid %s, mode %s", __entry->timer,
__entry->clockid == CLOCK_REALTIME ?
"CLOCK_REALTIME" : "CLOCK_MONOTONIC",
__entry->mode == HRTIMER_MODE_ABS ?
"HRTIMER_MODE_ABS" : "HRTIMER_MODE_REL")
);
/**
* hrtimer_start - called when the hrtimer is started
* @timer: pointer to struct hrtimer
*/
TRACE_EVENT(hrtimer_start,
TP_PROTO(struct hrtimer *timer),
TP_ARGS(timer),
TP_STRUCT__entry(
__field( void *, timer )
__field( void *, function )
__field( s64, expires )
__field( s64, softexpires )
),
TP_fast_assign(
__entry->timer = timer;
__entry->function = timer->function;
__entry->expires = hrtimer_get_expires(timer).tv64;
__entry->softexpires = hrtimer_get_softexpires(timer).tv64;
),
TP_printk("hrtimer %p, func %pf, expires %llu, softexpires %llu",
__entry->timer, __entry->function,
(unsigned long long)ktime_to_ns((ktime_t) {
.tv64 = __entry->expires }),
(unsigned long long)ktime_to_ns((ktime_t) {
.tv64 = __entry->softexpires }))
);
/**
* htimmer_expire_entry - called immediately before the hrtimer callback
* @timer: pointer to struct hrtimer
* @now: pointer to variable which contains current time of the
* timers base.
*
* Allows to determine the timer latency.
*/
TRACE_EVENT(hrtimer_expire_entry,
TP_PROTO(struct hrtimer *timer, ktime_t *now),
TP_ARGS(timer, now),
TP_STRUCT__entry(
__field( void *, timer )
__field( s64, now )
),
TP_fast_assign(
__entry->timer = timer;
__entry->now = now->tv64;
),
TP_printk("hrtimer %p, now %llu", __entry->timer,
(unsigned long long)ktime_to_ns((ktime_t) {
.tv64 = __entry->now }))
);
/**
* hrtimer_expire_exit - called immediately after the hrtimer callback returns
* @timer: pointer to struct hrtimer
*
* When used in combination with the hrtimer_expire_entry tracepoint we can
* determine the runtime of the callback function.
*/
TRACE_EVENT(hrtimer_expire_exit,
TP_PROTO(struct hrtimer *timer),
TP_ARGS(timer),
TP_STRUCT__entry(
__field( void *, timer )
),
TP_fast_assign(
__entry->timer = timer;
),
TP_printk("hrtimer %p", __entry->timer)
);
/**
* hrtimer_cancel - called when the hrtimer is canceled
* @timer: pointer to struct hrtimer
*/
TRACE_EVENT(hrtimer_cancel,
TP_PROTO(struct hrtimer *timer),
TP_ARGS(timer),
TP_STRUCT__entry(
__field( void *, timer )
),
TP_fast_assign(
__entry->timer = timer;
),
TP_printk("hrtimer %p", __entry->timer)
);
/**
* itimer_state - called when itimer is started or canceled
* @which: name of the interval timer
* @value: the itimers value, itimer is canceled if value->it_value is
* zero, otherwise it is started
* @expires: the itimers expiry time
*/
TRACE_EVENT(itimer_state,
TP_PROTO(int which, const struct itimerval *const value,
cputime_t expires),
TP_ARGS(which, value, expires),
TP_STRUCT__entry(
__field( int, which )
__field( cputime_t, expires )
__field( long, value_sec )
__field( long, value_usec )
__field( long, interval_sec )
__field( long, interval_usec )
),
TP_fast_assign(
__entry->which = which;
__entry->expires = expires;
__entry->value_sec = value->it_value.tv_sec;
__entry->value_usec = value->it_value.tv_usec;
__entry->interval_sec = value->it_interval.tv_sec;
__entry->interval_usec = value->it_interval.tv_usec;
),
TP_printk("which %d, expires %lu, it_value %lu.%lu, it_interval %lu.%lu",
__entry->which, __entry->expires,
__entry->value_sec, __entry->value_usec,
__entry->interval_sec, __entry->interval_usec)
);
/**
* itimer_expire - called when itimer expires
* @which: type of the interval timer
* @pid: pid of the process which owns the timer
* @now: current time, used to calculate the latency of itimer
*/
TRACE_EVENT(itimer_expire,
TP_PROTO(int which, struct pid *pid, cputime_t now),
TP_ARGS(which, pid, now),
TP_STRUCT__entry(
__field( int , which )
__field( pid_t, pid )
__field( cputime_t, now )
),
TP_fast_assign(
__entry->which = which;
__entry->now = now;
__entry->pid = pid_nr(pid);
),
TP_printk("which %d, pid %d, now %lu", __entry->which,
(int) __entry->pid, __entry->now)
);
#endif /* _TRACE_TIMER_H */
/* This part must be outside protection */
#include <trace/define_trace.h>

9
kernel/fork.c
View file

@ -63,6 +63,7 @@
#include <linux/fs_struct.h>
#include <linux/magic.h>
#include <linux/perf_event.h>
#include <linux/posix-timers.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
@ -805,10 +806,10 @@ static void posix_cpu_timers_init_group(struct signal_struct *sig)
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;
sig->it[CPUCLOCK_PROF].expires = cputime_zero;
sig->it[CPUCLOCK_PROF].incr = cputime_zero;
sig->it[CPUCLOCK_VIRT].expires = cputime_zero;
sig->it[CPUCLOCK_VIRT].incr = cputime_zero;
/* Cached expiration times. */
sig->cputime_expires.prof_exp = cputime_zero;

40
kernel/hrtimer.c
View file

@ -48,6 +48,8 @@
#include <asm/uaccess.h>
#include <trace/events/timer.h>
/*
* The timer bases:
*
@ -442,6 +444,26 @@ static inline void debug_hrtimer_activate(struct hrtimer *timer) { }
static inline void debug_hrtimer_deactivate(struct hrtimer *timer) { }
#endif
static inline void
debug_init(struct hrtimer *timer, clockid_t clockid,
enum hrtimer_mode mode)
{
debug_hrtimer_init(timer);
trace_hrtimer_init(timer, clockid, mode);
}
static inline void debug_activate(struct hrtimer *timer)
{
debug_hrtimer_activate(timer);
trace_hrtimer_start(timer);
}
static inline void debug_deactivate(struct hrtimer *timer)
{
debug_hrtimer_deactivate(timer);
trace_hrtimer_cancel(timer);
}
/* High resolution timer related functions */
#ifdef CONFIG_HIGH_RES_TIMERS
@ -798,7 +820,7 @@ static int enqueue_hrtimer(struct hrtimer *timer,
struct hrtimer *entry;
int leftmost = 1;
debug_hrtimer_activate(timer);
debug_activate(timer);
/*
* Find the right place in the rbtree:
@ -884,7 +906,7 @@ remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base)
* reprogramming happens in the interrupt handler. This is a
* rare case and less expensive than a smp call.
*/
debug_hrtimer_deactivate(timer);
debug_deactivate(timer);
timer_stats_hrtimer_clear_start_info(timer);
reprogram = base->cpu_base == &__get_cpu_var(hrtimer_bases);
__remove_hrtimer(timer, base, HRTIMER_STATE_INACTIVE,
@ -1117,7 +1139,7 @@ static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
void hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
enum hrtimer_mode mode)
{
debug_hrtimer_init(timer);
debug_init(timer, clock_id, mode);
__hrtimer_init(timer, clock_id, mode);
}
EXPORT_SYMBOL_GPL(hrtimer_init);
@ -1141,7 +1163,7 @@ int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp)
}
EXPORT_SYMBOL_GPL(hrtimer_get_res);
static void __run_hrtimer(struct hrtimer *timer)
static void __run_hrtimer(struct hrtimer *timer, ktime_t *now)
{
struct hrtimer_clock_base *base = timer->base;
struct hrtimer_cpu_base *cpu_base = base->cpu_base;
@ -1150,7 +1172,7 @@ static void __run_hrtimer(struct hrtimer *timer)
WARN_ON(!irqs_disabled());
debug_hrtimer_deactivate(timer);
debug_deactivate(timer);
__remove_hrtimer(timer, base, HRTIMER_STATE_CALLBACK, 0);
timer_stats_account_hrtimer(timer);
fn = timer->function;
@ -1161,7 +1183,9 @@ static void __run_hrtimer(struct hrtimer *timer)
* the timer base.
*/
spin_unlock(&cpu_base->lock);
trace_hrtimer_expire_entry(timer, now);
restart = fn(timer);
trace_hrtimer_expire_exit(timer);
spin_lock(&cpu_base->lock);
/*
@ -1272,7 +1296,7 @@ void hrtimer_interrupt(struct clock_event_device *dev)
break;
}
__run_hrtimer(timer);
__run_hrtimer(timer, &basenow);
}
base++;
}
@ -1394,7 +1418,7 @@ void hrtimer_run_queues(void)
hrtimer_get_expires_tv64(timer))
break;
__run_hrtimer(timer);
__run_hrtimer(timer, &base->softirq_time);
}
spin_unlock(&cpu_base->lock);
}
@ -1571,7 +1595,7 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
while ((node = rb_first(&old_base->active))) {
timer = rb_entry(node, struct hrtimer, node);
BUG_ON(hrtimer_callback_running(timer));
debug_hrtimer_deactivate(timer);
debug_deactivate(timer);
/*
* Mark it as STATE_MIGRATE not INACTIVE otherwise the

169
kernel/itimer.c
View file

@ -12,6 +12,7 @@
#include <linux/time.h>
#include <linux/posix-timers.h>
#include <linux/hrtimer.h>
#include <trace/events/timer.h>
#include <asm/uaccess.h>
@ -41,10 +42,43 @@ static struct timeval itimer_get_remtime(struct hrtimer *timer)
return ktime_to_timeval(rem);
}
static void get_cpu_itimer(struct task_struct *tsk, unsigned int clock_id,
struct itimerval *const value)
{
cputime_t cval, cinterval;
struct cpu_itimer *it = &tsk->signal->it[clock_id];
spin_lock_irq(&tsk->sighand->siglock);
cval = it->expires;
cinterval = it->incr;
if (!cputime_eq(cval, cputime_zero)) {
struct task_cputime cputime;
cputime_t t;
thread_group_cputimer(tsk, &cputime);
if (clock_id == CPUCLOCK_PROF)
t = cputime_add(cputime.utime, cputime.stime);
else
/* CPUCLOCK_VIRT */
t = cputime.utime;
if (cputime_le(cval, t))
/* about to fire */
cval = cputime_one_jiffy;
else
cval = cputime_sub(cval, t);
}
spin_unlock_irq(&tsk->sighand->siglock);
cputime_to_timeval(cval, &value->it_value);
cputime_to_timeval(cinterval, &value->it_interval);
}
int do_getitimer(int which, struct itimerval *value)
{
struct task_struct *tsk = current;
cputime_t cinterval, cval;
switch (which) {
case ITIMER_REAL:
@ -55,44 +89,10 @@ int do_getitimer(int which, struct itimerval *value)
spin_unlock_irq(&tsk->sighand->siglock);
break;
case ITIMER_VIRTUAL:
spin_lock_irq(&tsk->sighand->siglock);
cval = tsk->signal->it_virt_expires;
cinterval = tsk->signal->it_virt_incr;
if (!cputime_eq(cval, cputime_zero)) {
struct task_cputime cputime;
cputime_t utime;
thread_group_cputimer(tsk, &cputime);
utime = cputime.utime;
if (cputime_le(cval, utime)) { /* about to fire */
cval = jiffies_to_cputime(1);
} else {
cval = cputime_sub(cval, utime);
}
}
spin_unlock_irq(&tsk->sighand->siglock);
cputime_to_timeval(cval, &value->it_value);
cputime_to_timeval(cinterval, &value->it_interval);
get_cpu_itimer(tsk, CPUCLOCK_VIRT, value);
break;
case ITIMER_PROF:
spin_lock_irq(&tsk->sighand->siglock);
cval = tsk->signal->it_prof_expires;
cinterval = tsk->signal->it_prof_incr;
if (!cputime_eq(cval, cputime_zero)) {
struct task_cputime times;
cputime_t ptime;
thread_group_cputimer(tsk, &times);
ptime = cputime_add(times.utime, times.stime);
if (cputime_le(cval, ptime)) { /* about to fire */
cval = jiffies_to_cputime(1);
} else {
cval = cputime_sub(cval, ptime);
}
}
spin_unlock_irq(&tsk->sighand->siglock);
cputime_to_timeval(cval, &value->it_value);
cputime_to_timeval(cinterval, &value->it_interval);
get_cpu_itimer(tsk, CPUCLOCK_PROF, value);
break;
default:
return(-EINVAL);
@ -123,11 +123,62 @@ enum hrtimer_restart it_real_fn(struct hrtimer *timer)
struct signal_struct *sig =
container_of(timer, struct signal_struct, real_timer);
trace_itimer_expire(ITIMER_REAL, sig->leader_pid, 0);
kill_pid_info(SIGALRM, SEND_SIG_PRIV, sig->leader_pid);
return HRTIMER_NORESTART;
}
static inline u32 cputime_sub_ns(cputime_t ct, s64 real_ns)
{
struct timespec ts;
s64 cpu_ns;
cputime_to_timespec(ct, &ts);
cpu_ns = timespec_to_ns(&ts);
return (cpu_ns <= real_ns) ? 0 : cpu_ns - real_ns;
}
static void set_cpu_itimer(struct task_struct *tsk, unsigned int clock_id,
const struct itimerval *const value,
struct itimerval *const ovalue)
{
cputime_t cval, nval, cinterval, ninterval;
s64 ns_ninterval, ns_nval;
struct cpu_itimer *it = &tsk->signal->it[clock_id];
nval = timeval_to_cputime(&value->it_value);
ns_nval = timeval_to_ns(&value->it_value);
ninterval = timeval_to_cputime(&value->it_interval);
ns_ninterval = timeval_to_ns(&value->it_interval);
it->incr_error = cputime_sub_ns(ninterval, ns_ninterval);
it->error = cputime_sub_ns(nval, ns_nval);
spin_lock_irq(&tsk->sighand->siglock);
cval = it->expires;
cinterval = it->incr;
if (!cputime_eq(cval, cputime_zero) ||
!cputime_eq(nval, cputime_zero)) {
if (cputime_gt(nval, cputime_zero))
nval = cputime_add(nval, cputime_one_jiffy);
set_process_cpu_timer(tsk, clock_id, &nval, &cval);
}
it->expires = nval;
it->incr = ninterval;
trace_itimer_state(clock_id == CPUCLOCK_VIRT ?
ITIMER_VIRTUAL : ITIMER_PROF, value, nval);
spin_unlock_irq(&tsk->sighand->siglock);
if (ovalue) {
cputime_to_timeval(cval, &ovalue->it_value);
cputime_to_timeval(cinterval, &ovalue->it_interval);
}
}
/*
* Returns true if the timeval is in canonical form
*/
@ -139,7 +190,6 @@ int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue)
struct task_struct *tsk = current;
struct hrtimer *timer;
ktime_t expires;
cputime_t cval, cinterval, nval, ninterval;
/*
* Validate the timevals in value.
@ -171,51 +221,14 @@ again:
} else
tsk->signal->it_real_incr.tv64 = 0;
trace_itimer_state(ITIMER_REAL, value, 0);
spin_unlock_irq(&tsk->sighand->siglock);
break;
case ITIMER_VIRTUAL:
nval = timeval_to_cputime(&value->it_value);
ninterval = timeval_to_cputime(&value->it_interval);
spin_lock_irq(&tsk->sighand->siglock);
cval = tsk->signal->it_virt_expires;
cinterval = tsk->signal->it_virt_incr;
if (!cputime_eq(cval, cputime_zero) ||
!cputime_eq(nval, cputime_zero)) {
if (cputime_gt(nval, cputime_zero))
nval = cputime_add(nval,
jiffies_to_cputime(1));
set_process_cpu_timer(tsk, CPUCLOCK_VIRT,
&nval, &cval);
}
tsk->signal->it_virt_expires = nval;
tsk->signal->it_virt_incr = ninterval;
spin_unlock_irq(&tsk->sighand->siglock);
if (ovalue) {
cputime_to_timeval(cval, &ovalue->it_value);
cputime_to_timeval(cinterval, &ovalue->it_interval);
}
set_cpu_itimer(tsk, CPUCLOCK_VIRT, value, ovalue);
break;
case ITIMER_PROF:
nval = timeval_to_cputime(&value->it_value);
ninterval = timeval_to_cputime(&value->it_interval);
spin_lock_irq(&tsk->sighand->siglock);
cval = tsk->signal->it_prof_expires;
cinterval = tsk->signal->it_prof_incr;
if (!cputime_eq(cval, cputime_zero) ||
!cputime_eq(nval, cputime_zero)) {
if (cputime_gt(nval, cputime_zero))
nval = cputime_add(nval,
jiffies_to_cputime(1));
set_process_cpu_timer(tsk, CPUCLOCK_PROF,
&nval, &cval);
}
tsk->signal->it_prof_expires = nval;
tsk->signal->it_prof_incr = ninterval;
spin_unlock_irq(&tsk->sighand->siglock);
if (ovalue) {
cputime_to_timeval(cval, &ovalue->it_value);
cputime_to_timeval(cinterval, &ovalue->it_interval);
}
set_cpu_itimer(tsk, CPUCLOCK_PROF, value, ovalue);
break;
default:
return -EINVAL;

155
kernel/posix-cpu-timers.c
View file

@ -8,17 +8,18 @@
#include <linux/math64.h>
#include <asm/uaccess.h>
#include <linux/kernel_stat.h>
#include <trace/events/timer.h>
/*
* Called after updating RLIMIT_CPU to set timer expiration if necessary.
*/
void update_rlimit_cpu(unsigned long rlim_new)
{
cputime_t cputime;
cputime_t cputime = secs_to_cputime(rlim_new);
struct signal_struct *const sig = current->signal;
cputime = secs_to_cputime(rlim_new);
if (cputime_eq(current->signal->it_prof_expires, cputime_zero) ||
cputime_gt(current->signal->it_prof_expires, cputime)) {
if (cputime_eq(sig->it[CPUCLOCK_PROF].expires, cputime_zero) ||
cputime_gt(sig->it[CPUCLOCK_PROF].expires, cputime)) {
spin_lock_irq(&current->sighand->siglock);
set_process_cpu_timer(current, CPUCLOCK_PROF, &cputime, NULL);
spin_unlock_irq(&current->sighand->siglock);
@ -542,6 +543,17 @@ static void clear_dead_task(struct k_itimer *timer, union cpu_time_count now)
now);
}
static inline int expires_gt(cputime_t expires, cputime_t new_exp)
{
return cputime_eq(expires, cputime_zero) ||
cputime_gt(expires, new_exp);
}
static inline int expires_le(cputime_t expires, cputime_t new_exp)
{
return !cputime_eq(expires, cputime_zero) &&
cputime_le(expires, new_exp);
}
/*
* Insert the timer on the appropriate list before any timers that
* expire later. This must be called with the tasklist_lock held
@ -586,34 +598,32 @@ static void arm_timer(struct k_itimer *timer, union cpu_time_count now)
*/
if (CPUCLOCK_PERTHREAD(timer->it_clock)) {
union cpu_time_count *exp = &nt->expires;
switch (CPUCLOCK_WHICH(timer->it_clock)) {
default:
BUG();
case CPUCLOCK_PROF:
if (cputime_eq(p->cputime_expires.prof_exp,
cputime_zero) ||
cputime_gt(p->cputime_expires.prof_exp,
nt->expires.cpu))
p->cputime_expires.prof_exp =
nt->expires.cpu;
if (expires_gt(p->cputime_expires.prof_exp,
exp->cpu))
p->cputime_expires.prof_exp = exp->cpu;
break;
case CPUCLOCK_VIRT:
if (cputime_eq(p->cputime_expires.virt_exp,
cputime_zero) ||
cputime_gt(p->cputime_expires.virt_exp,
nt->expires.cpu))
p->cputime_expires.virt_exp =
nt->expires.cpu;
if (expires_gt(p->cputime_expires.virt_exp,
exp->cpu))
p->cputime_expires.virt_exp = exp->cpu;
break;
case CPUCLOCK_SCHED:
if (p->cputime_expires.sched_exp == 0 ||
p->cputime_expires.sched_exp >
nt->expires.sched)
p->cputime_expires.sched_exp > exp->sched)
p->cputime_expires.sched_exp =
nt->expires.sched;
exp->sched;
break;
}
} else {
struct signal_struct *const sig = p->signal;
union cpu_time_count *exp = &timer->it.cpu.expires;
/*
* For a process timer, set the cached expiration time.
*/
@ -621,30 +631,23 @@ static void arm_timer(struct k_itimer *timer, union cpu_time_count now)
default:
BUG();
case CPUCLOCK_VIRT:
if (!cputime_eq(p->signal->it_virt_expires,
cputime_zero) &&
cputime_lt(p->signal->it_virt_expires,
timer->it.cpu.expires.cpu))
if (expires_le(sig->it[CPUCLOCK_VIRT].expires,
exp->cpu))
break;
p->signal->cputime_expires.virt_exp =
timer->it.cpu.expires.cpu;
sig->cputime_expires.virt_exp = exp->cpu;
break;
case CPUCLOCK_PROF:
if (!cputime_eq(p->signal->it_prof_expires,
cputime_zero) &&
cputime_lt(p->signal->it_prof_expires,
timer->it.cpu.expires.cpu))
if (expires_le(sig->it[CPUCLOCK_PROF].expires,
exp->cpu))
break;
i = p->signal->rlim[RLIMIT_CPU].rlim_cur;
i = sig->rlim[RLIMIT_CPU].rlim_cur;
if (i != RLIM_INFINITY &&
i <= cputime_to_secs(timer->it.cpu.expires.cpu))
i <= cputime_to_secs(exp->cpu))
break;
p->signal->cputime_expires.prof_exp =
timer->it.cpu.expires.cpu;
sig->cputime_expires.prof_exp = exp->cpu;
break;
case CPUCLOCK_SCHED:
p->signal->cputime_expires.sched_exp =
timer->it.cpu.expires.sched;
sig->cputime_expires.sched_exp = exp->sched;
break;
}
}
@ -1071,6 +1074,40 @@ static void stop_process_timers(struct task_struct *tsk)
spin_unlock_irqrestore(&cputimer->lock, flags);
}
static u32 onecputick;
static void check_cpu_itimer(struct task_struct *tsk, struct cpu_itimer *it,
cputime_t *expires, cputime_t cur_time, int signo)
{
if (cputime_eq(it->expires, cputime_zero))
return;
if (cputime_ge(cur_time, it->expires)) {
if (!cputime_eq(it->incr, cputime_zero)) {
it->expires = cputime_add(it->expires, it->incr);
it->error += it->incr_error;
if (it->error >= onecputick) {
it->expires = cputime_sub(it->expires,
cputime_one_jiffy);
it->error -= onecputick;
}
} else {
it->expires = cputime_zero;
}
trace_itimer_expire(signo == SIGPROF ?
ITIMER_PROF : ITIMER_VIRTUAL,
tsk->signal->leader_pid, cur_time);
__group_send_sig_info(signo, SEND_SIG_PRIV, tsk);
}
if (!cputime_eq(it->expires, cputime_zero) &&
(cputime_eq(*expires, cputime_zero) ||
cputime_lt(it->expires, *expires))) {
*expires = it->expires;
}
}
/*
* Check for any per-thread CPU timers that have fired and move them
* off the tsk->*_timers list onto the firing list. Per-thread timers
@ -1090,10 +1127,10 @@ static void check_process_timers(struct task_struct *tsk,
* Don't sample the current process CPU clocks if there are no timers.
*/
if (list_empty(&timers[CPUCLOCK_PROF]) &&
cputime_eq(sig->it_prof_expires, cputime_zero) &&
cputime_eq(sig->it[CPUCLOCK_PROF].expires, cputime_zero) &&
sig->rlim[RLIMIT_CPU].rlim_cur == RLIM_INFINITY &&
list_empty(&timers[CPUCLOCK_VIRT]) &&
cputime_eq(sig->it_virt_expires, cputime_zero) &&
cputime_eq(sig->it[CPUCLOCK_VIRT].expires, cputime_zero) &&
list_empty(&timers[CPUCLOCK_SCHED])) {
stop_process_timers(tsk);
return;
@ -1153,38 +1190,11 @@ static void check_process_timers(struct task_struct *tsk,
/*
* Check for the special case process timers.
*/
if (!cputime_eq(sig->it_prof_expires, cputime_zero)) {
if (cputime_ge(ptime, sig->it_prof_expires)) {
/* ITIMER_PROF fires and reloads. */
sig->it_prof_expires = sig->it_prof_incr;
if (!cputime_eq(sig->it_prof_expires, cputime_zero)) {
sig->it_prof_expires = cputime_add(
sig->it_prof_expires, ptime);
}
__group_send_sig_info(SIGPROF, SEND_SIG_PRIV, tsk);
}
if (!cputime_eq(sig->it_prof_expires, cputime_zero) &&
(cputime_eq(prof_expires, cputime_zero) ||
cputime_lt(sig->it_prof_expires, prof_expires))) {
prof_expires = sig->it_prof_expires;
}
}
if (!cputime_eq(sig->it_virt_expires, cputime_zero)) {
if (cputime_ge(utime, sig->it_virt_expires)) {
/* ITIMER_VIRTUAL fires and reloads. */
sig->it_virt_expires = sig->it_virt_incr;
if (!cputime_eq(sig->it_virt_expires, cputime_zero)) {
sig->it_virt_expires = cputime_add(
sig->it_virt_expires, utime);
}
__group_send_sig_info(SIGVTALRM, SEND_SIG_PRIV, tsk);
}
if (!cputime_eq(sig->it_virt_expires, cputime_zero) &&
(cputime_eq(virt_expires, cputime_zero) ||
cputime_lt(sig->it_virt_expires, virt_expires))) {
virt_expires = sig->it_virt_expires;
}
}
check_cpu_itimer(tsk, &sig->it[CPUCLOCK_PROF], &prof_expires, ptime,
SIGPROF);
check_cpu_itimer(tsk, &sig->it[CPUCLOCK_VIRT], &virt_expires, utime,
SIGVTALRM);
if (sig->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
unsigned long psecs = cputime_to_secs(ptime);
cputime_t x;
@ -1457,7 +1467,7 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
if (!cputime_eq(*oldval, cputime_zero)) {
if (cputime_le(*oldval, now.cpu)) {
/* Just about to fire. */
*oldval = jiffies_to_cputime(1);
*oldval = cputime_one_jiffy;
} else {
*oldval = cputime_sub(*oldval, now.cpu);
}
@ -1703,10 +1713,15 @@ static __init int init_posix_cpu_timers(void)
.nsleep = thread_cpu_nsleep,
.nsleep_restart = thread_cpu_nsleep_restart,
};
struct timespec ts;
register_posix_clock(CLOCK_PROCESS_CPUTIME_ID, &process);
register_posix_clock(CLOCK_THREAD_CPUTIME_ID, &thread);
cputime_to_timespec(cputime_one_jiffy, &ts);
onecputick = ts.tv_nsec;
WARN_ON(ts.tv_sec != 0);
return 0;
}
__initcall(init_posix_cpu_timers);

9
kernel/sched.c
View file

@ -5092,17 +5092,16 @@ void account_idle_time(cputime_t cputime)
*/
void account_process_tick(struct task_struct *p, int user_tick)
{
cputime_t one_jiffy = jiffies_to_cputime(1);
cputime_t one_jiffy_scaled = cputime_to_scaled(one_jiffy);
cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
struct rq *rq = this_rq();
if (user_tick)
account_user_time(p, one_jiffy, one_jiffy_scaled);
account_user_time(p, cputime_one_jiffy, one_jiffy_scaled);
else if ((p != rq->idle) || (irq_count() != HARDIRQ_OFFSET))
account_system_time(p, HARDIRQ_OFFSET, one_jiffy,
account_system_time(p, HARDIRQ_OFFSET, cputime_one_jiffy,
one_jiffy_scaled);
else
account_idle_time(one_jiffy);
account_idle_time(cputime_one_jiffy);
}
/*

32
kernel/timer.c
View file

@ -46,6 +46,9 @@
#include <asm/timex.h>
#include <asm/io.h>
#define CREATE_TRACE_POINTS
#include <trace/events/timer.h>
u64 jiffies_64 __cacheline_aligned_in_smp = INITIAL_JIFFIES;
EXPORT_SYMBOL(jiffies_64);
@ -521,6 +524,25 @@ static inline void debug_timer_activate(struct timer_list *timer) { }
static inline void debug_timer_deactivate(struct timer_list *timer) { }
#endif
static inline void debug_init(struct timer_list *timer)
{
debug_timer_init(timer);
trace_timer_init(timer);
}
static inline void
debug_activate(struct timer_list *timer, unsigned long expires)
{
debug_timer_activate(timer);
trace_timer_start(timer, expires);
}
static inline void debug_deactivate(struct timer_list *timer)
{
debug_timer_deactivate(timer);
trace_timer_cancel(timer);
}
static void __init_timer(struct timer_list *timer,
const char *name,
struct lock_class_key *key)
@ -549,7 +571,7 @@ void init_timer_key(struct timer_list *timer,
const char *name,
struct lock_class_key *key)
{
debug_timer_init(timer);
debug_init(timer);
__init_timer(timer, name, key);
}
EXPORT_SYMBOL(init_timer_key);
@ -568,7 +590,7 @@ static inline void detach_timer(struct timer_list *timer,
{
struct list_head *entry = &timer->entry;
debug_timer_deactivate(timer);
debug_deactivate(timer);
__list_del(entry->prev, entry->next);
if (clear_pending)
@ -632,7 +654,7 @@ __mod_timer(struct timer_list *timer, unsigned long expires,
goto out_unlock;
}
debug_timer_activate(timer);
debug_activate(timer, expires);
new_base = __get_cpu_var(tvec_bases);
@ -787,7 +809,7 @@ void add_timer_on(struct timer_list *timer, int cpu)
BUG_ON(timer_pending(timer) || !timer->function);
spin_lock_irqsave(&base->lock, flags);
timer_set_base(timer, base);
debug_timer_activate(timer);
debug_activate(timer, timer->expires);
if (time_before(timer->expires, base->next_timer) &&
!tbase_get_deferrable(timer->base))
base->next_timer = timer->expires;
@ -1000,7 +1022,9 @@ static inline void __run_timers(struct tvec_base *base)
*/
lock_map_acquire(&lockdep_map);
trace_timer_expire_entry(timer);
fn(data);
trace_timer_expire_exit(timer);
lock_map_release(&lockdep_map);