[PATCH RESEND 19/36] posix-timers: Convert internals to use nsecs

From: Frederic Weisbecker
Date: Mon Jan 30 2017 - 22:14:37 EST

Use the new nsec based cputime accessors as part of the whole cputime
conversion from cputime_t to nsecs.

Also convert posix-cpu-timers to use nsec based internal counters to
simplify it.

Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
Cc: Wanpeng Li <wanpeng.li@xxxxxxxxxxx>
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
---
include/linux/posix-timers.h | 12 +--
include/linux/sched.h | 6 +-
kernel/fork.c | 2 +-
kernel/sched/cputime.c | 6 +-
kernel/sched/stats.h | 4 +-
kernel/time/itimer.c | 6 +-
kernel/time/posix-cpu-timers.c | 210 +++++++++++++++++------------------------
7 files changed, 100 insertions(+), 146 deletions(-)

diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 62d44c1..890de52 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -8,19 +8,9 @@
#include <linux/alarmtimer.h>


-static inline unsigned long long cputime_to_expires(cputime_t expires)
-{
- return (__force unsigned long long)expires;
-}
-
-static inline cputime_t expires_to_cputime(unsigned long long expires)
-{
- return (__force cputime_t)expires;
-}
-
struct cpu_timer_list {
struct list_head entry;
- unsigned long long expires, incr;
+ u64 expires, incr;
struct task_struct *task;
int firing;
};
diff --git a/include/linux/sched.h b/include/linux/sched.h
index dc44366..baa6a28 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -755,7 +755,7 @@ struct signal_struct {
struct thread_group_cputimer cputimer;

/* Earliest-expiration cache. */
- struct task_cputime_t cputime_expires;
+ struct task_cputime cputime_expires;

#ifdef CONFIG_NO_HZ_FULL
atomic_t tick_dep_mask;
@@ -1689,7 +1689,7 @@ struct task_struct {
/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
unsigned long min_flt, maj_flt;

- struct task_cputime_t cputime_expires;
+ struct task_cputime cputime_expires;
struct list_head cpu_timers[3];

/* process credentials */
@@ -3527,7 +3527,7 @@ static __always_inline bool need_resched(void)
* Thread group CPU time accounting.
*/
void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
-void thread_group_cputimer(struct task_struct *tsk, struct task_cputime_t *times);
+void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);

static inline void thread_group_cputime_t(struct task_struct *tsk,
struct task_cputime_t *cputime)
diff --git a/kernel/fork.c b/kernel/fork.c
index 11c5c8a..09992ff 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1313,7 +1313,7 @@ static void posix_cpu_timers_init_group(struct signal_struct *sig)

cpu_limit = READ_ONCE(sig->rlim[RLIMIT_CPU].rlim_cur);
if (cpu_limit != RLIM_INFINITY) {
- sig->cputime_expires.prof_exp = secs_to_cputime(cpu_limit);
+ sig->cputime_expires.prof_exp = cpu_limit * NSEC_PER_SEC;
sig->cputimer.running = true;
}

diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index bee6c97..f7b9624 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -122,7 +122,7 @@ void account_user_time(struct task_struct *p, cputime_t cputime)

/* Add user time to process. */
p->utime += cputime_to_nsecs(cputime);
- account_group_user_time(p, cputime);
+ account_group_user_time(p, cputime_to_nsecs(cputime));

index = (task_nice(p) > 0) ? CPUTIME_NICE : CPUTIME_USER;

@@ -144,7 +144,7 @@ void account_guest_time(struct task_struct *p, cputime_t cputime)

/* Add guest time to process. */
p->utime += cputime_to_nsecs(cputime);
- account_group_user_time(p, cputime);
+ account_group_user_time(p, cputime_to_nsecs(cputime));
p->gtime += cputime_to_nsecs(cputime);

/* Add guest time to cpustat. */
@@ -168,7 +168,7 @@ void account_system_index_time(struct task_struct *p,
{
/* Add system time to process. */
p->stime += cputime_to_nsecs(cputime);
- account_group_system_time(p, cputime);
+ account_group_system_time(p, cputime_to_nsecs(cputime));

/* Add system time to cpustat. */
task_group_account_field(p, index, cputime_to_nsecs(cputime));
diff --git a/kernel/sched/stats.h b/kernel/sched/stats.h
index 34659a8..9788478 100644
--- a/kernel/sched/stats.h
+++ b/kernel/sched/stats.h
@@ -216,7 +216,7 @@ static inline bool cputimer_running(struct task_struct *tsk)
* running CPU and update the utime field there.
*/
static inline void account_group_user_time(struct task_struct *tsk,
- cputime_t cputime)
+ u64 cputime)
{
struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;

@@ -237,7 +237,7 @@ static inline void account_group_user_time(struct task_struct *tsk,
* running CPU and update the stime field there.
*/
static inline void account_group_system_time(struct task_struct *tsk,
- cputime_t cputime)
+ u64 cputime)
{
struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;

diff --git a/kernel/time/itimer.c b/kernel/time/itimer.c
index f2d5097..bb01ff4 100644
--- a/kernel/time/itimer.c
+++ b/kernel/time/itimer.c
@@ -53,15 +53,15 @@ static void get_cpu_itimer(struct task_struct *tsk, unsigned int clock_id,
cval = it->expires;
cinterval = it->incr;
if (cval) {
- struct task_cputime_t cputime;
+ struct task_cputime cputime;
cputime_t t;

thread_group_cputimer(tsk, &cputime);
if (clock_id == CPUCLOCK_PROF)
- t = cputime.utime + cputime.stime;
+ t = nsecs_to_cputime(cputime.utime + cputime.stime);
else
/* CPUCLOCK_VIRT */
- t = cputime.utime;
+ t = nsecs_to_cputime(cputime.utime);

if (cval < t)
/* about to fire */
diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index 8349e02..45be3ce 100644
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -50,39 +50,14 @@ static int check_clock(const clockid_t which_clock)
return error;
}

-static inline unsigned long long
-timespec_to_sample(const clockid_t which_clock, const struct timespec *tp)
-{
- unsigned long long ret;
-
- ret = 0; /* high half always zero when .cpu used */
- if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) {
- ret = (unsigned long long)tp->tv_sec * NSEC_PER_SEC + tp->tv_nsec;
- } else {
- ret = cputime_to_expires(timespec_to_cputime(tp));
- }
- return ret;
-}
-
-static void sample_to_timespec(const clockid_t which_clock,
- unsigned long long expires,
- struct timespec *tp)
-{
- if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED)
- *tp = ns_to_timespec(expires);
- else
- cputime_to_timespec((__force cputime_t)expires, tp);
-}
-
/*
* Update expiry time from increment, and increase overrun count,
* given the current clock sample.
*/
-static void bump_cpu_timer(struct k_itimer *timer,
- unsigned long long now)
+static void bump_cpu_timer(struct k_itimer *timer, u64 now)
{
int i;
- unsigned long long delta, incr;
+ u64 delta, incr;

if (timer->it.cpu.incr == 0)
return;
@@ -115,28 +90,28 @@ static void bump_cpu_timer(struct k_itimer *timer,
* Checks @cputime to see if all fields are zero. Returns true if all fields
* are zero, false if any field is nonzero.
*/
-static inline int task_cputime_zero(const struct task_cputime_t *cputime)
+static inline int task_cputime_zero(const struct task_cputime *cputime)
{
if (!cputime->utime && !cputime->stime && !cputime->sum_exec_runtime)
return 1;
return 0;
}

-static inline unsigned long long prof_ticks(struct task_struct *p)
+static inline u64 prof_ticks(struct task_struct *p)
{
- cputime_t utime, stime;
+ u64 utime, stime;

- task_cputime_t(p, &utime, &stime);
+ task_cputime(p, &utime, &stime);

- return cputime_to_expires(utime + stime);
+ return utime + stime;
}
-static inline unsigned long long virt_ticks(struct task_struct *p)
+static inline u64 virt_ticks(struct task_struct *p)
{
- cputime_t utime, stime;
+ u64 utime, stime;

- task_cputime_t(p, &utime, &stime);
+ task_cputime(p, &utime, &stime);

- return cputime_to_expires(utime);
+ return utime;
}

static int
@@ -176,8 +151,8 @@ posix_cpu_clock_set(const clockid_t which_clock, const struct timespec *tp)
/*
* Sample a per-thread clock for the given task.
*/
-static int cpu_clock_sample(const clockid_t which_clock, struct task_struct *p,
- unsigned long long *sample)
+static int cpu_clock_sample(const clockid_t which_clock,
+ struct task_struct *p, u64 *sample)
{
switch (CPUCLOCK_WHICH(which_clock)) {
default:
@@ -210,7 +185,7 @@ static inline void __update_gt_cputime(atomic64_t *cputime, u64 sum_cputime)
}
}

-static void update_gt_cputime(struct task_cputime_atomic *cputime_atomic, struct task_cputime_t *sum)
+static void update_gt_cputime(struct task_cputime_atomic *cputime_atomic, struct task_cputime *sum)
{
__update_gt_cputime(&cputime_atomic->utime, sum->utime);
__update_gt_cputime(&cputime_atomic->stime, sum->stime);
@@ -218,7 +193,7 @@ static void update_gt_cputime(struct task_cputime_atomic *cputime_atomic, struct
}

/* Sample task_cputime_atomic values in "atomic_timers", store results in "times". */
-static inline void sample_cputime_atomic(struct task_cputime_t *times,
+static inline void sample_cputime_atomic(struct task_cputime *times,
struct task_cputime_atomic *atomic_times)
{
times->utime = atomic64_read(&atomic_times->utime);
@@ -226,10 +201,10 @@ static inline void sample_cputime_atomic(struct task_cputime_t *times,
times->sum_exec_runtime = atomic64_read(&atomic_times->sum_exec_runtime);
}

-void thread_group_cputimer(struct task_struct *tsk, struct task_cputime_t *times)
+void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times)
{
struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
- struct task_cputime_t sum;
+ struct task_cputime sum;

/* Check if cputimer isn't running. This is accessed without locking. */
if (!READ_ONCE(cputimer->running)) {
@@ -238,7 +213,7 @@ void thread_group_cputimer(struct task_struct *tsk, struct task_cputime_t *times
* values through the TIMER_ABSTIME flag, therefore we have
* to synchronize the timer to the clock every time we start it.
*/
- thread_group_cputime_t(tsk, &sum);
+ thread_group_cputime(tsk, &sum);
update_gt_cputime(&cputimer->cputime_atomic, &sum);

/*
@@ -260,23 +235,23 @@ void thread_group_cputimer(struct task_struct *tsk, struct task_cputime_t *times
*/
static int cpu_clock_sample_group(const clockid_t which_clock,
struct task_struct *p,
- unsigned long long *sample)
+ u64 *sample)
{
- struct task_cputime_t cputime;
+ struct task_cputime cputime;

switch (CPUCLOCK_WHICH(which_clock)) {
default:
return -EINVAL;
case CPUCLOCK_PROF:
- thread_group_cputime_t(p, &cputime);
- *sample = cputime_to_expires(cputime.utime + cputime.stime);
+ thread_group_cputime(p, &cputime);
+ *sample = cputime.utime + cputime.stime;
break;
case CPUCLOCK_VIRT:
- thread_group_cputime_t(p, &cputime);
- *sample = cputime_to_expires(cputime.utime);
+ thread_group_cputime(p, &cputime);
+ *sample = cputime.utime;
break;
case CPUCLOCK_SCHED:
- thread_group_cputime_t(p, &cputime);
+ thread_group_cputime(p, &cputime);
*sample = cputime.sum_exec_runtime;
break;
}
@@ -288,7 +263,7 @@ static int posix_cpu_clock_get_task(struct task_struct *tsk,
struct timespec *tp)
{
int err = -EINVAL;
- unsigned long long rtn;
+ u64 rtn;

if (CPUCLOCK_PERTHREAD(which_clock)) {
if (same_thread_group(tsk, current))
@@ -299,7 +274,7 @@ static int posix_cpu_clock_get_task(struct task_struct *tsk,
}

if (!err)
- sample_to_timespec(which_clock, rtn, tp);
+ *tp = ns_to_timespec(rtn);

return err;
}
@@ -453,7 +428,7 @@ void posix_cpu_timers_exit_group(struct task_struct *tsk)
cleanup_timers(tsk->signal->cpu_timers);
}

-static inline int expires_gt(cputime_t expires, cputime_t new_exp)
+static inline int expires_gt(u64 expires, u64 new_exp)
{
return expires == 0 || expires > new_exp;
}
@@ -466,7 +441,7 @@ static void arm_timer(struct k_itimer *timer)
{
struct task_struct *p = timer->it.cpu.task;
struct list_head *head, *listpos;
- struct task_cputime_t *cputime_expires;
+ struct task_cputime *cputime_expires;
struct cpu_timer_list *const nt = &timer->it.cpu;
struct cpu_timer_list *next;

@@ -488,7 +463,7 @@ static void arm_timer(struct k_itimer *timer)
list_add(&nt->entry, listpos);

if (listpos == head) {
- unsigned long long exp = nt->expires;
+ u64 exp = nt->expires;

/*
* We are the new earliest-expiring POSIX 1.b timer, hence
@@ -499,16 +474,15 @@ static void arm_timer(struct k_itimer *timer)

switch (CPUCLOCK_WHICH(timer->it_clock)) {
case CPUCLOCK_PROF:
- if (expires_gt(cputime_expires->prof_exp, expires_to_cputime(exp)))
- cputime_expires->prof_exp = expires_to_cputime(exp);
+ if (expires_gt(cputime_expires->prof_exp, exp))
+ cputime_expires->prof_exp = exp;
break;
case CPUCLOCK_VIRT:
- if (expires_gt(cputime_expires->virt_exp, expires_to_cputime(exp)))
- cputime_expires->virt_exp = expires_to_cputime(exp);
+ if (expires_gt(cputime_expires->virt_exp, exp))
+ cputime_expires->virt_exp = exp;
break;
case CPUCLOCK_SCHED:
- if (cputime_expires->sched_exp == 0 ||
- cputime_expires->sched_exp > exp)
+ if (expires_gt(cputime_expires->sched_exp, exp))
cputime_expires->sched_exp = exp;
break;
}
@@ -559,20 +533,19 @@ static void cpu_timer_fire(struct k_itimer *timer)
* traversal.
*/
static int cpu_timer_sample_group(const clockid_t which_clock,
- struct task_struct *p,
- unsigned long long *sample)
+ struct task_struct *p, u64 *sample)
{
- struct task_cputime_t cputime;
+ struct task_cputime cputime;

thread_group_cputimer(p, &cputime);
switch (CPUCLOCK_WHICH(which_clock)) {
default:
return -EINVAL;
case CPUCLOCK_PROF:
- *sample = cputime_to_expires(cputime.utime + cputime.stime);
+ *sample = cputime.utime + cputime.stime;
break;
case CPUCLOCK_VIRT:
- *sample = cputime_to_expires(cputime.utime);
+ *sample = cputime.utime;
break;
case CPUCLOCK_SCHED:
*sample = cputime.sum_exec_runtime;
@@ -593,12 +566,12 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,
unsigned long flags;
struct sighand_struct *sighand;
struct task_struct *p = timer->it.cpu.task;
- unsigned long long old_expires, new_expires, old_incr, val;
+ u64 old_expires, new_expires, old_incr, val;
int ret;

WARN_ON_ONCE(p == NULL);

- new_expires = timespec_to_sample(timer->it_clock, &new->it_value);
+ new_expires = timespec_to_ns(&new->it_value);

/*
* Protect against sighand release/switch in exit/exec and p->cpu_timers
@@ -659,9 +632,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,
bump_cpu_timer(timer, val);
if (val < timer->it.cpu.expires) {
old_expires = timer->it.cpu.expires - val;
- sample_to_timespec(timer->it_clock,
- old_expires,
- &old->it_value);
+ old->it_value = ns_to_timespec(old_expires);
} else {
old->it_value.tv_nsec = 1;
old->it_value.tv_sec = 0;
@@ -699,8 +670,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,
* Install the new reload setting, and
* set up the signal and overrun bookkeeping.
*/
- timer->it.cpu.incr = timespec_to_sample(timer->it_clock,
- &new->it_interval);
+ timer->it.cpu.incr = timespec_to_ns(&new->it_interval);

/*
* This acts as a modification timestamp for the timer,
@@ -723,17 +693,15 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,

ret = 0;
out:
- if (old) {
- sample_to_timespec(timer->it_clock,
- old_incr, &old->it_interval);
- }
+ if (old)
+ old->it_interval = ns_to_timespec(old_incr);

return ret;
}

static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
{
- unsigned long long now;
+ u64 now;
struct task_struct *p = timer->it.cpu.task;

WARN_ON_ONCE(p == NULL);
@@ -741,8 +709,7 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
/*
* Easy part: convert the reload time.
*/
- sample_to_timespec(timer->it_clock,
- timer->it.cpu.incr, &itp->it_interval);
+ itp->it_interval = ns_to_timespec(timer->it.cpu.incr);

if (timer->it.cpu.expires == 0) { /* Timer not armed at all. */
itp->it_value.tv_sec = itp->it_value.tv_nsec = 0;
@@ -761,7 +728,7 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
/*
* Protect against sighand release/switch in exit/exec and
* also make timer sampling safe if it ends up calling
- * thread_group_cputime_t().
+ * thread_group_cputime().
*/
sighand = lock_task_sighand(p, &flags);
if (unlikely(sighand == NULL)) {
@@ -771,8 +738,7 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
* Call the timer disarmed, nothing else to do.
*/
timer->it.cpu.expires = 0;
- sample_to_timespec(timer->it_clock, timer->it.cpu.expires,
- &itp->it_value);
+ itp->it_value = ns_to_timespec(timer->it.cpu.expires);
return;
} else {
cpu_timer_sample_group(timer->it_clock, p, &now);
@@ -781,9 +747,7 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
}

if (now < timer->it.cpu.expires) {
- sample_to_timespec(timer->it_clock,
- timer->it.cpu.expires - now,
- &itp->it_value);
+ itp->it_value = ns_to_timespec(timer->it.cpu.expires - now);
} else {
/*
* The timer should have expired already, but the firing
@@ -826,8 +790,8 @@ static void check_thread_timers(struct task_struct *tsk,
{
struct list_head *timers = tsk->cpu_timers;
struct signal_struct *const sig = tsk->signal;
- struct task_cputime_t *tsk_expires = &tsk->cputime_expires;
- unsigned long long expires;
+ struct task_cputime *tsk_expires = &tsk->cputime_expires;
+ u64 expires;
unsigned long soft;

/*
@@ -838,10 +802,10 @@ static void check_thread_timers(struct task_struct *tsk,
return;

expires = check_timers_list(timers, firing, prof_ticks(tsk));
- tsk_expires->prof_exp = expires_to_cputime(expires);
+ tsk_expires->prof_exp = expires;

expires = check_timers_list(++timers, firing, virt_ticks(tsk));
- tsk_expires->virt_exp = expires_to_cputime(expires);
+ tsk_expires->virt_exp = expires;

tsk_expires->sched_exp = check_timers_list(++timers, firing,
tsk->se.sum_exec_runtime);
@@ -891,13 +855,12 @@ static inline void stop_process_timers(struct signal_struct *sig)
}

static void check_cpu_itimer(struct task_struct *tsk, struct cpu_itimer *it,
- unsigned long long *expires,
- unsigned long long cur_time, int signo)
+ u64 *expires, u64 cur_time, int signo)
{
if (!it->expires)
return;

- if (cur_time >= it->expires) {
+ if (cur_time >= cputime_to_nsecs(it->expires)) {
if (it->incr) {
it->expires += it->incr;
it->error += it->incr_error;
@@ -915,8 +878,8 @@ static void check_cpu_itimer(struct task_struct *tsk, struct cpu_itimer *it,
__group_send_sig_info(signo, SEND_SIG_PRIV, tsk);
}

- if (it->expires && (!*expires || it->expires < *expires)) {
- *expires = it->expires;
+ if (it->expires && (!*expires || cputime_to_nsecs(it->expires) < *expires)) {
+ *expires = cputime_to_nsecs(it->expires);
}
}

@@ -929,10 +892,10 @@ static void check_process_timers(struct task_struct *tsk,
struct list_head *firing)
{
struct signal_struct *const sig = tsk->signal;
- unsigned long long utime, ptime, virt_expires, prof_expires;
- unsigned long long sum_sched_runtime, sched_expires;
+ u64 utime, ptime, virt_expires, prof_expires;
+ u64 sum_sched_runtime, sched_expires;
struct list_head *timers = sig->cpu_timers;
- struct task_cputime_t cputime;
+ struct task_cputime cputime;
unsigned long soft;

/*
@@ -952,8 +915,8 @@ static void check_process_timers(struct task_struct *tsk,
* Collect the current process totals.
*/
thread_group_cputimer(tsk, &cputime);
- utime = cputime_to_expires(cputime.utime);
- ptime = utime + cputime_to_expires(cputime.stime);
+ utime = cputime.utime;
+ ptime = utime + cputime.stime;
sum_sched_runtime = cputime.sum_exec_runtime;

prof_expires = check_timers_list(timers, firing, ptime);
@@ -969,10 +932,10 @@ static void check_process_timers(struct task_struct *tsk,
SIGVTALRM);
soft = READ_ONCE(sig->rlim[RLIMIT_CPU].rlim_cur);
if (soft != RLIM_INFINITY) {
- unsigned long psecs = cputime_to_secs(ptime);
+ unsigned long psecs = div_u64(ptime, NSEC_PER_SEC);
unsigned long hard =
READ_ONCE(sig->rlim[RLIMIT_CPU].rlim_max);
- cputime_t x;
+ u64 x;
if (psecs >= hard) {
/*
* At the hard limit, we just die.
@@ -991,14 +954,13 @@ static void check_process_timers(struct task_struct *tsk,
sig->rlim[RLIMIT_CPU].rlim_cur = soft;
}
}
- x = secs_to_cputime(soft);
- if (!prof_expires || x < prof_expires) {
+ x = soft * NSEC_PER_SEC;
+ if (!prof_expires || x < prof_expires)
prof_expires = x;
- }
}

- sig->cputime_expires.prof_exp = expires_to_cputime(prof_expires);
- sig->cputime_expires.virt_exp = expires_to_cputime(virt_expires);
+ sig->cputime_expires.prof_exp = prof_expires;
+ sig->cputime_expires.virt_exp = virt_expires;
sig->cputime_expires.sched_exp = sched_expires;
if (task_cputime_zero(&sig->cputime_expires))
stop_process_timers(sig);
@@ -1015,7 +977,7 @@ void posix_cpu_timer_schedule(struct k_itimer *timer)
struct sighand_struct *sighand;
unsigned long flags;
struct task_struct *p = timer->it.cpu.task;
- unsigned long long now;
+ u64 now;

WARN_ON_ONCE(p == NULL);

@@ -1035,7 +997,7 @@ void posix_cpu_timer_schedule(struct k_itimer *timer)
} else {
/*
* Protect arm_timer() and timer sampling in case of call to
- * thread_group_cputime_t().
+ * thread_group_cputime().
*/
sighand = lock_task_sighand(p, &flags);
if (unlikely(sighand == NULL)) {
@@ -1078,8 +1040,8 @@ void posix_cpu_timer_schedule(struct k_itimer *timer)
* Returns true if any field of the former is greater than the corresponding
* field of the latter if the latter field is set. Otherwise returns false.
*/
-static inline int task_cputime_expired(const struct task_cputime_t *sample,
- const struct task_cputime_t *expires)
+static inline int task_cputime_expired(const struct task_cputime *sample,
+ const struct task_cputime *expires)
{
if (expires->utime && sample->utime >= expires->utime)
return 1;
@@ -1106,9 +1068,9 @@ static inline int fastpath_timer_check(struct task_struct *tsk)
struct signal_struct *sig;

if (!task_cputime_zero(&tsk->cputime_expires)) {
- struct task_cputime_t task_sample;
+ struct task_cputime task_sample;

- task_cputime_t(tsk, &task_sample.utime, &task_sample.stime);
+ task_cputime(tsk, &task_sample.utime, &task_sample.stime);
task_sample.sum_exec_runtime = tsk->se.sum_exec_runtime;
if (task_cputime_expired(&task_sample, &tsk->cputime_expires))
return 1;
@@ -1131,7 +1093,7 @@ static inline int fastpath_timer_check(struct task_struct *tsk)
*/
if (READ_ONCE(sig->cputimer.running) &&
!READ_ONCE(sig->cputimer.checking_timer)) {
- struct task_cputime_t group_sample;
+ struct task_cputime group_sample;

sample_cputime_atomic(&group_sample, &sig->cputimer.cputime_atomic);

@@ -1214,7 +1176,7 @@ void run_posix_cpu_timers(struct task_struct *tsk)
void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
cputime_t *newval, cputime_t *oldval)
{
- unsigned long long now;
+ u64 now, new;

WARN_ON_ONCE(clock_idx == CPUCLOCK_SCHED);
cpu_timer_sample_group(clock_idx, tsk, &now);
@@ -1226,31 +1188,33 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
* it to be absolute.
*/
if (*oldval) {
- if (*oldval <= now) {
+ if (cputime_to_nsecs(*oldval) <= now) {
/* Just about to fire. */
*oldval = cputime_one_jiffy;
} else {
- *oldval -= now;
+ *oldval -= nsecs_to_cputime(now);
}
}

if (!*newval)
return;
- *newval += now;
+ *newval += nsecs_to_cputime(now);
}

+ new = cputime_to_nsecs(*newval);
+
/*
* Update expiration cache if we are the earliest timer, or eventually
* RLIMIT_CPU limit is earlier than prof_exp cpu timer expire.
*/
switch (clock_idx) {
case CPUCLOCK_PROF:
- if (expires_gt(tsk->signal->cputime_expires.prof_exp, *newval))
- tsk->signal->cputime_expires.prof_exp = *newval;
+ if (expires_gt(tsk->signal->cputime_expires.prof_exp, new))
+ tsk->signal->cputime_expires.prof_exp = new;
break;
case CPUCLOCK_VIRT:
- if (expires_gt(tsk->signal->cputime_expires.virt_exp, *newval))
- tsk->signal->cputime_expires.virt_exp = *newval;
+ if (expires_gt(tsk->signal->cputime_expires.virt_exp, new))
+ tsk->signal->cputime_expires.virt_exp = new;
break;
}

@@ -1308,7 +1272,7 @@ static int do_cpu_nanosleep(const clockid_t which_clock, int flags,
/*
* We were interrupted by a signal.
*/
- sample_to_timespec(which_clock, timer.it.cpu.expires, rqtp);
+ *rqtp = ns_to_timespec(timer.it.cpu.expires);
error = posix_cpu_timer_set(&timer, 0, &zero_it, it);
if (!error) {
/*
--
2.7.4