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-rw-r--r--cpu-exec.c33
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)