diff options
Diffstat (limited to 'cpu-exec.c')
| -rw-r--r-- | cpu-exec.c | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/cpu-exec.c b/cpu-exec.c index 68f82b631b..3c14502329 100644 --- a/cpu-exec.c +++ b/cpu-exec.c @@ -29,6 +29,7 @@ typedef struct SyncClocks { int64_t diff_clk; int64_t last_cpu_icount; + int64_t realtime_clock; } SyncClocks; #if !defined(CONFIG_USER_ONLY) @@ -37,6 +38,9 @@ typedef struct SyncClocks { * oscillate around 0. */ #define VM_CLOCK_ADVANCE 3000000 +#define THRESHOLD_REDUCE 1.5 +#define MAX_DELAY_PRINT_RATE 2000000000LL +#define MAX_NB_PRINTS 100 static void align_clocks(SyncClocks *sc, const CPUState *cpu) { @@ -68,16 +72,43 @@ static void align_clocks(SyncClocks *sc, const CPUState *cpu) } } +static void print_delay(const SyncClocks *sc) +{ + static float threshold_delay; + static int64_t last_realtime_clock; + static int nb_prints; + + if (icount_align_option && + sc->realtime_clock - last_realtime_clock >= MAX_DELAY_PRINT_RATE && + nb_prints < MAX_NB_PRINTS) { + if ((-sc->diff_clk / (float)1000000000LL > threshold_delay) || + (-sc->diff_clk / (float)1000000000LL < + (threshold_delay - THRESHOLD_REDUCE))) { + threshold_delay = (-sc->diff_clk / 1000000000LL) + 1; + printf("Warning: The guest is now late by %.1f to %.1f seconds\n", + threshold_delay - 1, + threshold_delay); + nb_prints++; + last_realtime_clock = sc->realtime_clock; + } + } +} + static void init_delay_params(SyncClocks *sc, const CPUState *cpu) { if (!icount_align_option) { return; } + sc->realtime_clock = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); sc->diff_clk = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - - qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + + sc->realtime_clock + cpu_get_clock_offset(); sc->last_cpu_icount = cpu->icount_extra + cpu->icount_decr.u16.low; + + /* Print every 2s max if the guest is late. We limit the number + of printed messages to NB_PRINT_MAX(currently 100) */ + print_delay(sc); } #else static void align_clocks(SyncClocks *sc, const CPUState *cpu) |