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Make futex_wait() use an hrtimer for timeout

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This patch modifies futex_wait() to use an hrtimer + schedule() in place of
schedule_timeout().

schedule_timeout() is tick based, therefore the timeout granularity is the
tick (1 ms, 4 ms or 10 ms depending on HZ).  By using a high resolution timer
for timeout wakeup, we can attain a much finer timeout granularity (in the
microsecond range).  This parallels what is already done for futex_lock_pi().

The timeout passed to the syscall is no longer converted to jiffies and is
therefore passed to do_futex() and futex_wait() as an absolute ktime_t
therefore keeping nanosecond resolution.

Also this removes the need to pass the nanoseconds timeout part to
futex_lock_pi() in val2.

In futex_wait(), if there is no timeout then a regular schedule() is
performed.  Otherwise, an hrtimer is fired before schedule() is called.

[akpm@linux-foundation.org: fix `make headers_check']
Signed-off-by: Sebastien Dugue <sebastien.dugue@bull.net>
Signed-off-by: Pierre Peiffer <pierre.peiffer@bull.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Pierre Peiffer 2007-05-09 02:35:02 -07:00 committed by Linus Torvalds
parent ec92d08292
commit c19384b5b2
3 changed files with 56 additions and 54 deletions
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4
include/linux/futex.h
View file

@ -3,6 +3,8 @@
#include <linux/sched.h>
union ktime;
/* Second argument to futex syscall */
@ -94,7 +96,7 @@ struct robust_list_head {
#define ROBUST_LIST_LIMIT 2048
#ifdef __KERNEL__
long do_futex(u32 __user *uaddr, int op, u32 val, unsigned long timeout,
long do_futex(u32 __user *uaddr, int op, u32 val, union ktime *timeout,
u32 __user *uaddr2, u32 val2, u32 val3);
extern int

87
kernel/futex.c
View file

@ -1001,16 +1001,16 @@ static void unqueue_me_pi(struct futex_q *q, struct futex_hash_bucket *hb)
}
static long futex_wait_restart(struct restart_block *restart);
static int futex_wait_abstime(u32 __user *uaddr, u32 val,
int timed, unsigned long abs_time)
static int futex_wait(u32 __user *uaddr, u32 val, ktime_t *abs_time)
{
struct task_struct *curr = current;
DECLARE_WAITQUEUE(wait, curr);
struct futex_hash_bucket *hb;
struct futex_q q;
unsigned long time_left = 0;
u32 uval;
int ret;
struct hrtimer_sleeper t;
int rem = 0;
q.pi_state = NULL;
retry:
@ -1088,20 +1088,29 @@ static int futex_wait_abstime(u32 __user *uaddr, u32 val,
* !plist_node_empty() is safe here without any lock.
* q.lock_ptr != 0 is not safe, because of ordering against wakeup.
*/
time_left = 0;
if (likely(!plist_node_empty(&q.list))) {
unsigned long rel_time;
if (!abs_time)
schedule();
else {
hrtimer_init(&t.timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
hrtimer_init_sleeper(&t, current);
t.timer.expires = *abs_time;
if (timed) {
unsigned long now = jiffies;
if (time_after(now, abs_time))
rel_time = 0;
else
rel_time = abs_time - now;
} else
rel_time = MAX_SCHEDULE_TIMEOUT;
hrtimer_start(&t.timer, t.timer.expires, HRTIMER_MODE_ABS);
time_left = schedule_timeout(rel_time);
/*
* the timer could have already expired, in which
* case current would be flagged for rescheduling.
* Don't bother calling schedule.
*/
if (likely(t.task))
schedule();
hrtimer_cancel(&t.timer);
/* Flag if a timeout occured */
rem = (t.task == NULL);
}
}
__set_current_state(TASK_RUNNING);
@ -1113,14 +1122,14 @@ static int futex_wait_abstime(u32 __user *uaddr, u32 val,
/* If we were woken (and unqueued), we succeeded, whatever. */
if (!unqueue_me(&q))
return 0;
if (time_left == 0)
if (rem)
return -ETIMEDOUT;
/*
* We expect signal_pending(current), but another thread may
* have handled it for us already.
*/
if (time_left == MAX_SCHEDULE_TIMEOUT)
if (!abs_time)
return -ERESTARTSYS;
else {
struct restart_block *restart;
@ -1128,8 +1137,7 @@ static int futex_wait_abstime(u32 __user *uaddr, u32 val,
restart->fn = futex_wait_restart;
restart->arg0 = (unsigned long)uaddr;
restart->arg1 = (unsigned long)val;
restart->arg2 = (unsigned long)timed;
restart->arg3 = abs_time;
restart->arg2 = (unsigned long)abs_time;
return -ERESTART_RESTARTBLOCK;
}
@ -1141,21 +1149,15 @@ static int futex_wait_abstime(u32 __user *uaddr, u32 val,
return ret;
}
static int futex_wait(u32 __user *uaddr, u32 val, unsigned long rel_time)
{
int timed = (rel_time != MAX_SCHEDULE_TIMEOUT);
return futex_wait_abstime(uaddr, val, timed, jiffies+rel_time);
}
static long futex_wait_restart(struct restart_block *restart)
{
u32 __user *uaddr = (u32 __user *)restart->arg0;
u32 val = (u32)restart->arg1;
int timed = (int)restart->arg2;
unsigned long abs_time = restart->arg3;
ktime_t *abs_time = (ktime_t *)restart->arg2;
restart->fn = do_no_restart_syscall;
return (long)futex_wait_abstime(uaddr, val, timed, abs_time);
return (long)futex_wait(uaddr, val, abs_time);
}
@ -1165,8 +1167,8 @@ static long futex_wait_restart(struct restart_block *restart)
* if there are waiters then it will block, it does PI, etc. (Due to
* races the kernel might see a 0 value of the futex too.)
*/
static int futex_lock_pi(u32 __user *uaddr, int detect, unsigned long sec,
long nsec, int trylock)
static int futex_lock_pi(u32 __user *uaddr, int detect, ktime_t *time,
int trylock)
{
struct hrtimer_sleeper timeout, *to = NULL;
struct task_struct *curr = current;
@ -1178,11 +1180,11 @@ static int futex_lock_pi(u32 __user *uaddr, int detect, unsigned long sec,
if (refill_pi_state_cache())
return -ENOMEM;
if (sec != MAX_SCHEDULE_TIMEOUT) {
if (time) {
to = &timeout;
hrtimer_init(&to->timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
hrtimer_init_sleeper(to, current);
to->timer.expires = ktime_set(sec, nsec);
to->timer.expires = *time;
}
q.pi_state = NULL;
@ -1818,7 +1820,7 @@ void exit_robust_list(struct task_struct *curr)
}
}
long do_futex(u32 __user *uaddr, int op, u32 val, unsigned long timeout,
long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
u32 __user *uaddr2, u32 val2, u32 val3)
{
int ret;
@ -1844,13 +1846,13 @@ long do_futex(u32 __user *uaddr, int op, u32 val, unsigned long timeout,
ret = futex_wake_op(uaddr, uaddr2, val, val2, val3);
break;
case FUTEX_LOCK_PI:
ret = futex_lock_pi(uaddr, val, timeout, val2, 0);
ret = futex_lock_pi(uaddr, val, timeout, 0);
break;
case FUTEX_UNLOCK_PI:
ret = futex_unlock_pi(uaddr);
break;
case FUTEX_TRYLOCK_PI:
ret = futex_lock_pi(uaddr, 0, timeout, val2, 1);
ret = futex_lock_pi(uaddr, 0, timeout, 1);
break;
default:
ret = -ENOSYS;
@ -1863,21 +1865,20 @@ asmlinkage long sys_futex(u32 __user *uaddr, int op, u32 val,
struct timespec __user *utime, u32 __user *uaddr2,
u32 val3)
{
struct timespec t;
unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
struct timespec ts;
ktime_t t, *tp = NULL;
u32 val2 = 0;
if (utime && (op == FUTEX_WAIT || op == FUTEX_LOCK_PI)) {
if (copy_from_user(&t, utime, sizeof(t)) != 0)
if (copy_from_user(&ts, utime, sizeof(ts)) != 0)
return -EFAULT;
if (!timespec_valid(&t))
if (!timespec_valid(&ts))
return -EINVAL;
t = timespec_to_ktime(ts);
if (op == FUTEX_WAIT)
timeout = timespec_to_jiffies(&t) + 1;
else {
timeout = t.tv_sec;
val2 = t.tv_nsec;
}
t = ktime_add(ktime_get(), t);
tp = &t;
}
/*
* requeue parameter in 'utime' if op == FUTEX_REQUEUE.
@ -1885,7 +1886,7 @@ asmlinkage long sys_futex(u32 __user *uaddr, int op, u32 val,
if (op == FUTEX_REQUEUE || op == FUTEX_CMP_REQUEUE)
val2 = (u32) (unsigned long) utime;
return do_futex(uaddr, op, val, timeout, uaddr2, val2, val3);
return do_futex(uaddr, op, val, tp, uaddr2, val2, val3);
}
static int futexfs_get_sb(struct file_system_type *fs_type,

19
kernel/futex_compat.c
View file

@ -141,24 +141,23 @@ asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, u32 val,
struct compat_timespec __user *utime, u32 __user *uaddr2,
u32 val3)
{
struct timespec t;
unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
struct timespec ts;
ktime_t t, *tp = NULL;
int val2 = 0;
if (utime && (op == FUTEX_WAIT || op == FUTEX_LOCK_PI)) {
if (get_compat_timespec(&t, utime))
if (get_compat_timespec(&ts, utime))
return -EFAULT;
if (!timespec_valid(&t))
if (!timespec_valid(&ts))
return -EINVAL;
t = timespec_to_ktime(ts);
if (op == FUTEX_WAIT)
timeout = timespec_to_jiffies(&t) + 1;
else {
timeout = t.tv_sec;
val2 = t.tv_nsec;
}
t = ktime_add(ktime_get(), t);
tp = &t;
}
if (op == FUTEX_REQUEUE || op == FUTEX_CMP_REQUEUE)
val2 = (int) (unsigned long) utime;
return do_futex(uaddr, op, val, timeout, uaddr2, val2, val3);
return do_futex(uaddr, op, val, tp, uaddr2, val2, val3);
}