epoll: make epoll_wait() use the hrtimer range feature

This make epoll use hrtimers for the timeout value which prevents
epoll_wait() from timing out up to a millisecond early.

This mirrors the behavior of select() and poll().

Signed-off-by: Shawn Bohrer <shawn.bohrer@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Davide Libenzi <davidel@xmailserver.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 256bb7b..8cf0724 100644 (file)
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -77,9 +77,6 @@
 /* Maximum number of nesting allowed inside epoll sets */
 #define EP_MAX_NESTS 4
 
-/* Maximum msec timeout value storeable in a long int */
-#define EP_MAX_MSTIMEO min(1000ULL * MAX_SCHEDULE_TIMEOUT / HZ, (LONG_MAX - 999ULL) / HZ)
-
 #define EP_MAX_EVENTS (INT_MAX / sizeof(struct epoll_event))
 
 #define EP_UNACTIVE_PTR ((void *) -1L)
@@ -1117,18 +1114,22 @@ static int ep_send_events(struct eventpoll *ep,
 static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
                   int maxevents, long timeout)
 {
-       int res, eavail;
+       int res, eavail, timed_out = 0;
        unsigned long flags;
-       long jtimeout;
+       long slack;
        wait_queue_t wait;
-
-       /*
-        * Calculate the timeout by checking for the "infinite" value (-1)
-        * and the overflow condition. The passed timeout is in milliseconds,
-        * that why (t * HZ) / 1000.
-        */
-       jtimeout = (timeout < 0 || timeout >= EP_MAX_MSTIMEO) ?
-               MAX_SCHEDULE_TIMEOUT : (timeout * HZ + 999) / 1000;
+       struct timespec end_time;
+       ktime_t expires, *to = NULL;
+
+       if (timeout > 0) {
+               ktime_get_ts(&end_time);
+               timespec_add_ns(&end_time, (u64)timeout * NSEC_PER_MSEC);
+               slack = select_estimate_accuracy(&end_time);
+               to = &expires;
+               *to = timespec_to_ktime(end_time);
+       } else if (timeout == 0) {
+               timed_out = 1;
+       }
 
 retry:
        spin_lock_irqsave(&ep->lock, flags);
@@ -1150,7 +1151,7 @@ retry:
                         * to TASK_INTERRUPTIBLE before doing the checks.
                         */
                        set_current_state(TASK_INTERRUPTIBLE);
-                       if (!list_empty(&ep->rdllist) || !jtimeout)
+                       if (!list_empty(&ep->rdllist) || timed_out)
                                break;
                        if (signal_pending(current)) {
                                res = -EINTR;
@@ -1158,7 +1159,9 @@ retry:
                        }
 
                        spin_unlock_irqrestore(&ep->lock, flags);
-                       jtimeout = schedule_timeout(jtimeout);
+                       if (!schedule_hrtimeout_range(to, slack, HRTIMER_MODE_ABS))
+                               timed_out = 1;
+
                        spin_lock_irqsave(&ep->lock, flags);
                }
                __remove_wait_queue(&ep->wq, &wait);
@@ -1176,7 +1179,7 @@ retry:
         * more luck.
         */
        if (!res && eavail &&
-           !(res = ep_send_events(ep, events, maxevents)) && jtimeout)
+           !(res = ep_send_events(ep, events, maxevents)) && !timed_out)
                goto retry;
 
        return res;

diff --git a/fs/select.c b/fs/select.c
index 5f023f9..b7b10aa 100644 (file)
--- a/fs/select.c
+++ b/fs/select.c
@@ -67,7 +67,7 @@ static long __estimate_accuracy(struct timespec *tv)
        return slack;
 }
 
-static long select_estimate_accuracy(struct timespec *tv)
+long select_estimate_accuracy(struct timespec *tv)
 {
        unsigned long ret;
        struct timespec now;

diff --git a/include/linux/poll.h b/include/linux/poll.h
index 600cc1f..56e76af 100644 (file)
--- a/include/linux/poll.h
+++ b/include/linux/poll.h
@@ -73,6 +73,8 @@ extern void poll_initwait(struct poll_wqueues *pwq);
 extern void poll_freewait(struct poll_wqueues *pwq);
 extern int poll_schedule_timeout(struct poll_wqueues *pwq, int state,
                                 ktime_t *expires, unsigned long slack);
+extern long select_estimate_accuracy(struct timespec *tv);
+
 
 static inline int poll_schedule(struct poll_wqueues *pwq, int state)
 {