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[Qemu-devel] [PATCH v6 2/3] cpus: Fix throttling during vm_stop
From: |
Yury Kotov |
Subject: |
[Qemu-devel] [PATCH v6 2/3] cpus: Fix throttling during vm_stop |
Date: |
Mon, 9 Sep 2019 13:49:47 +0300 |
Throttling thread sleeps in VCPU thread. For high throttle percentage
this sleep is more than 10ms. E.g. for 60% - 15ms, for 99% - 990ms.
vm_stop() kicks all VCPUs and waits for them. It's called at the end of
migration and because of the long sleep the migration downtime might be
more than 100ms even for downtime-limit 1ms.
Use qemu_cond_timedwait for high percentage to wake up during vm_stop.
Signed-off-by: Yury Kotov <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
---
cpus.c | 25 +++++++++++++++++--------
1 file changed, 17 insertions(+), 8 deletions(-)
diff --git a/cpus.c b/cpus.c
index 85cd451a86..d2c61ff155 100644
--- a/cpus.c
+++ b/cpus.c
@@ -77,6 +77,8 @@
#endif /* CONFIG_LINUX */
+static QemuMutex qemu_global_mutex;
+
int64_t max_delay;
int64_t max_advance;
@@ -782,7 +784,7 @@ static void cpu_throttle_thread(CPUState *cpu,
run_on_cpu_data opaque)
{
double pct;
double throttle_ratio;
- long sleeptime_ns;
+ int64_t sleeptime_ns, endtime_ns;
if (!cpu_throttle_get_percentage()) {
return;
@@ -790,11 +792,20 @@ static void cpu_throttle_thread(CPUState *cpu,
run_on_cpu_data opaque)
pct = (double)cpu_throttle_get_percentage()/100;
throttle_ratio = pct / (1 - pct);
- sleeptime_ns = (long)(throttle_ratio * CPU_THROTTLE_TIMESLICE_NS);
-
- qemu_mutex_unlock_iothread();
- g_usleep(sleeptime_ns / 1000); /* Convert ns to us for usleep call */
- qemu_mutex_lock_iothread();
+ /* Add 1ns to fix double's rounding error (like 0.9999999...) */
+ sleeptime_ns = (int64_t)(throttle_ratio * CPU_THROTTLE_TIMESLICE_NS + 1);
+ endtime_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + sleeptime_ns;
+ while (sleeptime_ns > 0 && !cpu->stop) {
+ if (sleeptime_ns > SCALE_MS) {
+ qemu_cond_timedwait(cpu->halt_cond, &qemu_global_mutex,
+ sleeptime_ns / SCALE_MS);
+ } else {
+ qemu_mutex_unlock_iothread();
+ g_usleep(sleeptime_ns / SCALE_US);
+ qemu_mutex_lock_iothread();
+ }
+ sleeptime_ns = endtime_ns - qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
+ }
atomic_set(&cpu->throttle_thread_scheduled, 0);
}
@@ -1172,8 +1183,6 @@ static void qemu_init_sigbus(void)
}
#endif /* !CONFIG_LINUX */
-static QemuMutex qemu_global_mutex;
-
static QemuThread io_thread;
/* cpu creation */
--
2.23.0
- [Qemu-devel] [PATCH v6 0/3] High downtime with 95+ throttle pct, Yury Kotov, 2019/09/09
- [Qemu-devel] [PATCH v6 3/3] tests/migration: Add a test for auto converge, Yury Kotov, 2019/09/09
- [Qemu-devel] [PATCH v6 1/3] qemu-thread: Add qemu_cond_timedwait, Yury Kotov, 2019/09/09
- [Qemu-devel] [PATCH v6 2/3] cpus: Fix throttling during vm_stop,
Yury Kotov <=
- Re: [Qemu-devel] [PATCH v6 0/3] High downtime with 95+ throttle pct, Paolo Bonzini, 2019/09/09
- Re: [Qemu-devel] [PATCH v6 0/3] High downtime with 95+ throttle pct, no-reply, 2019/09/09
- Re: [Qemu-devel] [PATCH v6 0/3] High downtime with 95+ throttle pct, no-reply, 2019/09/09