diff options
| author | Pavel Dovgalyuk <pavel.dovgalyuk@ispras.ru> | 2021-03-29 13:22:30 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-04-01 09:40:45 +0200 |
| commit | fe852ac2b3725055bb210270e3aca5a0ed4b6217 (patch) | |
| tree | a8fb5f2b635cc9278eecdb7f2240abc8030044f1 | |
| parent | cb4d9e38bd2a9077716d2e41778cd0bb155ae119 (diff) | |
icount: get rid of static variable
This patch moves static last_delta variable into timers_state
structure to allow correct vmstate operations with icount shift=auto enabled.
Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Message-Id: <161701335066.1180180.7104085247702343395.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | softmmu/cpu-timers.c | 5 | ||||
| -rw-r--r-- | softmmu/icount.c | 9 | ||||
| -rw-r--r-- | softmmu/timers-state.h | 2 |
3 files changed, 8 insertions, 8 deletions
diff --git a/softmmu/cpu-timers.c b/softmmu/cpu-timers.c index cd38595245..34ddfa02f1 100644 --- a/softmmu/cpu-timers.c +++ b/softmmu/cpu-timers.c @@ -188,11 +188,12 @@ static const VMStateDescription icount_vmstate_adjust_timers = { static const VMStateDescription icount_vmstate_shift = { .name = "timer/icount/shift", - .version_id = 1, - .minimum_version_id = 1, + .version_id = 2, + .minimum_version_id = 2, .needed = icount_shift_state_needed, .fields = (VMStateField[]) { VMSTATE_INT16(icount_time_shift, TimersState), + VMSTATE_INT64(last_delta, TimersState), VMSTATE_END_OF_LIST() } }; diff --git a/softmmu/icount.c b/softmmu/icount.c index dbcd8c3594..21341a4ce4 100644 --- a/softmmu/icount.c +++ b/softmmu/icount.c @@ -176,9 +176,6 @@ static void icount_adjust(void) int64_t cur_icount; int64_t delta; - /* Protected by TimersState mutex. */ - static int64_t last_delta; - /* If the VM is not running, then do nothing. */ if (!runstate_is_running()) { return; @@ -193,20 +190,20 @@ static void icount_adjust(void) delta = cur_icount - cur_time; /* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */ if (delta > 0 - && last_delta + ICOUNT_WOBBLE < delta * 2 + && timers_state.last_delta + ICOUNT_WOBBLE < delta * 2 && timers_state.icount_time_shift > 0) { /* The guest is getting too far ahead. Slow time down. */ qatomic_set(&timers_state.icount_time_shift, timers_state.icount_time_shift - 1); } if (delta < 0 - && last_delta - ICOUNT_WOBBLE > delta * 2 + && timers_state.last_delta - ICOUNT_WOBBLE > delta * 2 && timers_state.icount_time_shift < MAX_ICOUNT_SHIFT) { /* The guest is getting too far behind. Speed time up. */ qatomic_set(&timers_state.icount_time_shift, timers_state.icount_time_shift + 1); } - last_delta = delta; + timers_state.last_delta = delta; qatomic_set_i64(&timers_state.qemu_icount_bias, cur_icount - (timers_state.qemu_icount << timers_state.icount_time_shift)); diff --git a/softmmu/timers-state.h b/softmmu/timers-state.h index db4e60f18f..8c262ce139 100644 --- a/softmmu/timers-state.h +++ b/softmmu/timers-state.h @@ -43,6 +43,8 @@ typedef struct TimersState { /* Conversion factor from emulated instructions to virtual clock ticks. */ int16_t icount_time_shift; + /* Icount delta used for shift auto adjust. */ + int64_t last_delta; /* Compensate for varying guest execution speed. */ int64_t qemu_icount_bias; |