Messages in this thread Patch in this message | | | Date | Fri, 29 Aug 2008 08:08:43 -0700 | From | Arjan van de Ven <> | Subject | [PATCH 5/5] select: make poll() use schedule_hrtimeout() as well |
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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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