On Sat, Oct 22, 2011 at 00:26, Paolo Bonzini <pbonz...@redhat.com> wrote:
> Reviewed-by: Anthony Liguori <aligu...@us.ibm.com>
> Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
> ---
> qemu-timer.c | 129
> ++++++++++++++++++++++++----------------------------------
> 1 files changed, 53 insertions(+), 76 deletions(-)
>
> diff --git a/qemu-timer.c b/qemu-timer.c
> index acf7a15..e2551f3 100644
> --- a/qemu-timer.c
> +++ b/qemu-timer.c
> @@ -153,7 +153,7 @@ struct qemu_alarm_timer {
> char const *name;
> int (*start)(struct qemu_alarm_timer *t);
> void (*stop)(struct qemu_alarm_timer *t);
> - void (*rearm)(struct qemu_alarm_timer *t);
> + void (*rearm)(struct qemu_alarm_timer *t, int64_t nearest_delta_ns);
> #if defined(__linux__)
> int fd;
> timer_t timer;
> @@ -181,12 +181,46 @@ static inline int alarm_has_dynticks(struct
> qemu_alarm_timer *t)
> return !!t->rearm;
> }
>
> +static int64_t qemu_next_alarm_deadline(void)
> +{
> + int64_t delta;
> + int64_t rtdelta;
> +
> + if (!use_icount && vm_clock->active_timers) {
> + delta = vm_clock->active_timers->expire_time -
> + qemu_get_clock_ns(vm_clock);
> + } else {
> + delta = INT32_MAX;
> + }
> + if (host_clock->active_timers) {
> + int64_t hdelta = host_clock->active_timers->expire_time -
> + qemu_get_clock_ns(host_clock);
> + if (hdelta < delta) {
> + delta = hdelta;
> + }
> + }
> + if (rt_clock->active_timers) {
> + rtdelta = (rt_clock->active_timers->expire_time -
> + qemu_get_clock_ns(rt_clock));
> + if (rtdelta < delta) {
> + delta = rtdelta;
> + }
> + }
> +
> + return delta;
> +}
> +
> static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t)
> {
> - if (!alarm_has_dynticks(t))
> + int64_t nearest_delta_ns;
> + assert(alarm_has_dynticks(t));
"mmtimer" and "win32" alarms have no rearm. Should we remove these two alarms?
> + if (!rt_clock->active_timers &&
> + !vm_clock->active_timers &&
> + !host_clock->active_timers) {
> return;
> -
> - t->rearm(t);
> + }
> + nearest_delta_ns = qemu_next_alarm_deadline();
> + t->rearm(t, nearest_delta_ns);
> }
>
> /* TODO: MIN_TIMER_REARM_NS should be optimized */
> @@ -196,23 +230,23 @@ static void qemu_rearm_alarm_timer(struct
> qemu_alarm_timer *t)
>
> static int mm_start_timer(struct qemu_alarm_timer *t);
> static void mm_stop_timer(struct qemu_alarm_timer *t);
> -static void mm_rearm_timer(struct qemu_alarm_timer *t);
> +static void mm_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
>
> static int win32_start_timer(struct qemu_alarm_timer *t);
> static void win32_stop_timer(struct qemu_alarm_timer *t);
> -static void win32_rearm_timer(struct qemu_alarm_timer *t);
> +static void win32_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
>
> #else
>
> static int unix_start_timer(struct qemu_alarm_timer *t);
> static void unix_stop_timer(struct qemu_alarm_timer *t);
> -static void unix_rearm_timer(struct qemu_alarm_timer *t);
> +static void unix_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
>
> #ifdef __linux__
>
> static int dynticks_start_timer(struct qemu_alarm_timer *t);
> static void dynticks_stop_timer(struct qemu_alarm_timer *t);
> -static void dynticks_rearm_timer(struct qemu_alarm_timer *t);
> +static void dynticks_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
>
> #endif /* __linux__ */
>
> @@ -715,8 +749,6 @@ void qemu_run_all_timers(void)
> qemu_run_timers(host_clock);
> }
>
> -static int64_t qemu_next_alarm_deadline(void);
> -
> #ifdef _WIN32
> static void CALLBACK host_alarm_handler(PVOID lpParam, BOOLEAN unused)
> #else
> @@ -781,33 +813,6 @@ int64_t qemu_next_icount_deadline(void)
> return delta;
> }
>
> -static int64_t qemu_next_alarm_deadline(void)
> -{
> - int64_t delta;
> - int64_t rtdelta;
> -
> - if (!use_icount && vm_clock->active_timers) {
> - delta = vm_clock->active_timers->expire_time -
> - qemu_get_clock_ns(vm_clock);
> - } else {
> - delta = INT32_MAX;
> - }
> - if (host_clock->active_timers) {
> - int64_t hdelta = host_clock->active_timers->expire_time -
> - qemu_get_clock_ns(host_clock);
> - if (hdelta < delta)
> - delta = hdelta;
> - }
> - if (rt_clock->active_timers) {
> - rtdelta = (rt_clock->active_timers->expire_time -
> - qemu_get_clock_ns(rt_clock));
> - if (rtdelta < delta)
> - delta = rtdelta;
> - }
> -
> - return delta;
> -}
> -
> #if defined(__linux__)
>
> #include "compatfd.h"
> @@ -860,20 +865,13 @@ static void dynticks_stop_timer(struct qemu_alarm_timer
> *t)
> timer_delete(host_timer);
> }
>
> -static void dynticks_rearm_timer(struct qemu_alarm_timer *t)
> +static void dynticks_rearm_timer(struct qemu_alarm_timer *t,
> + int64_t nearest_delta_ns)
> {
> timer_t host_timer = t->timer;
> struct itimerspec timeout;
> - int64_t nearest_delta_ns = INT64_MAX;
> int64_t current_ns;
>
> - assert(alarm_has_dynticks(t));
> - if (!rt_clock->active_timers &&
> - !vm_clock->active_timers &&
> - !host_clock->active_timers)
> - return;
> -
> - nearest_delta_ns = qemu_next_alarm_deadline();
> if (nearest_delta_ns < MIN_TIMER_REARM_NS)
> nearest_delta_ns = MIN_TIMER_REARM_NS;
>
> @@ -915,19 +913,12 @@ static int unix_start_timer(struct qemu_alarm_timer *t)
> return 0;
> }
>
> -static void unix_rearm_timer(struct qemu_alarm_timer *t)
> +static void unix_rearm_timer(struct qemu_alarm_timer *t,
> + int64_t nearest_delta_ns)
> {
> struct itimerval itv;
> - int64_t nearest_delta_ns = INT64_MAX;
> int err;
>
> - assert(alarm_has_dynticks(t));
> - if (!rt_clock->active_timers &&
> - !vm_clock->active_timers &&
> - !host_clock->active_timers)
> - return;
> -
> - nearest_delta_ns = qemu_next_alarm_deadline();
> if (nearest_delta_ns < MIN_TIMER_REARM_NS)
> nearest_delta_ns = MIN_TIMER_REARM_NS;
>
> @@ -1014,23 +1005,14 @@ static void mm_stop_timer(struct qemu_alarm_timer *t)
> timeEndPeriod(mm_period);
> }
>
> -static void mm_rearm_timer(struct qemu_alarm_timer *t)
> +static void mm_rearm_timer(struct qemu_alarm_timer *t, int64_t delta)
> {
> - int nearest_delta_ms;
> -
> - assert(alarm_has_dynticks(t));
> - if (!rt_clock->active_timers &&
> - !vm_clock->active_timers &&
> - !host_clock->active_timers) {
> - return;
> - }
> -
> - timeKillEvent(mm_timer);
> -
> - nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000;
> + int nearest_delta_ms = (delta + 999999) / 1000000;
> if (nearest_delta_ms < 1) {
> nearest_delta_ms = 1;
> }
> +
> + timeKillEvent(mm_timer);
> mm_timer = timeSetEvent(nearest_delta_ms,
> mm_period,
> mm_alarm_handler,
> @@ -1082,19 +1064,14 @@ static void win32_stop_timer(struct qemu_alarm_timer
> *t)
> }
> }
>
> -static void win32_rearm_timer(struct qemu_alarm_timer *t)
> +static void win32_rearm_timer(struct qemu_alarm_timer *t,
> + int64_t nearest_delta_ns)
> {
> HANDLE hTimer = t->timer;
> int nearest_delta_ms;
> BOOLEAN success;
>
> - assert(alarm_has_dynticks(t));
> - if (!rt_clock->active_timers &&
> - !vm_clock->active_timers &&
> - !host_clock->active_timers)
> - return;
> -
> - nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000;
> + nearest_delta_ms = (nearest_delta_ns + 999999) / 1000000;
> if (nearest_delta_ms < 1) {
> nearest_delta_ms = 1;
> }
> --
> 1.7.6
>
>
>
>
