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Subject[PATCH 5/5] select: make poll() use schedule_hrtimeout() as well

From: Arjan van de Ven <arjan@linux.intel.com>
Date: Thu, 28 Aug 2008 13:46:47 -0700
Subject: [PATCH] select: make poll() use schedule_hrtimeout() as well

similar to the select() patch, use schedule_hrtimeout() in the
poll() codepath.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
---
fs/select.c | 46 ++++++++++++++++++++++++++++++----------------
1 files changed, 30 insertions(+), 16 deletions(-)
diff --git a/fs/select.c b/fs/select.c
index 62b9767..e881b97 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -631,6 +631,10 @@ static int do_poll(unsigned int nfds, struct poll_list *list,
{
int count = 0;
poll_table* pt = &wait->pt;
+ int use_hr = 0;
+
+ if (*timeout < HZ && *timeout > 0)
+ use_hr = 1;

/* Optimise the no-wait case */
if (!(*timeout))
@@ -673,24 +677,34 @@ static int do_poll(unsigned int nfds, struct poll_list *list,
if (count || !*timeout)
break;

- if (*timeout < 0) {
- /* Wait indefinitely */
- __timeout = MAX_SCHEDULE_TIMEOUT;
- } else if (unlikely(*timeout >= (s64)MAX_SCHEDULE_TIMEOUT-1)) {
- /*
- * Wait for longer than MAX_SCHEDULE_TIMEOUT. Do it in
- * a loop
- */
- __timeout = MAX_SCHEDULE_TIMEOUT - 1;
- *timeout -= __timeout;
+ if (use_hr) {
+ struct timespec now;
+ ktime_t expire;
+ schedule_hrtimeout(end_time, HRTIMER_MODE_ABS);
+ getnstimeofday(&now);
+ expire = ktime_sub(timespec_to_ktime(*end_time), timespec_to_ktime(now));
+ if (ktime_to_ns(expire) <= 0)
+ break;
} else {
- __timeout = *timeout;
- *timeout = 0;
- }
+ if (*timeout < 0) {
+ /* Wait indefinitely */
+ __timeout = MAX_SCHEDULE_TIMEOUT;
+ } else if (unlikely(*timeout >= (s64)MAX_SCHEDULE_TIMEOUT-1)) {
+ /*
+ * Wait for longer than MAX_SCHEDULE_TIMEOUT. Do it in
+ * a loop
+ */
+ __timeout = MAX_SCHEDULE_TIMEOUT - 1;
+ *timeout -= __timeout;
+ } else {
+ __timeout = *timeout;
+ *timeout = 0;
+ }

- __timeout = schedule_timeout(__timeout);
- if (*timeout >= 0)
- *timeout += __timeout;
+ __timeout = schedule_timeout(__timeout);
+ if (*timeout >= 0)
+ *timeout += __timeout;
+ }
}
__set_current_state(TASK_RUNNING);
return count;
--
1.5.5.1


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