Let's start with a retry interval of 30 seconds and double the time until
we reach 30 minutes, in case we keep getting errors. Reset the retry
interval in case we succeeded.
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Igor Mammedov <imammedo@xxxxxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
---
drivers/virtio/virtio_mem.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index 807d4e393427..3a57434f92ed 100644
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c
@@ -137,7 +137,9 @@ struct virtio_mem {
/* Timer for retrying to plug/unplug memory. */
struct hrtimer retry_timer;
-#define VIRTIO_MEM_RETRY_TIMER_MS 30000
+ unsigned int retry_timer_ms;
+#define VIRTIO_MEM_RETRY_TIMER_MIN_MS 30000
+#define VIRTIO_MEM_RETRY_TIMER_MAX_MS 1800000
/* Memory notifier (online/offline events). */
struct notifier_block memory_notifier;
@@ -1537,6 +1539,7 @@ static void virtio_mem_run_wq(struct work_struct *work)
switch (rc) {
case 0:
+ vm->retry_timer_ms = VIRTIO_MEM_RETRY_TIMER_MIN_MS;
break;
case -ENOSPC:
/*
@@ -1552,8 +1555,7 @@ static void virtio_mem_run_wq(struct work_struct *work)
*/
case -ENOMEM:
/* Out of memory, try again later. */
- hrtimer_start(&vm->retry_timer,
- ms_to_ktime(VIRTIO_MEM_RETRY_TIMER_MS),
+ hrtimer_start(&vm->retry_timer, ms_to_ktime(vm->retry_timer_ms),
HRTIMER_MODE_REL);
break;
case -EAGAIN:
@@ -1573,6 +1575,9 @@ static enum hrtimer_restart virtio_mem_timer_expired(struct hrtimer *timer)
retry_timer);
virtio_mem_retry(vm);
+ /* Racy (with reset in virtio_mem_run_wq), we ignore that for now. */
+ vm->retry_timer_ms = min_t(unsigned int, vm->retry_timer_ms * 2,
+ VIRTIO_MEM_RETRY_TIMER_MAX_MS);
return HRTIMER_NORESTART;
}
@@ -1746,6 +1751,7 @@ static int virtio_mem_probe(struct virtio_device *vdev)
spin_lock_init(&vm->removal_lock);
hrtimer_init(&vm->retry_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
vm->retry_timer.function = virtio_mem_timer_expired;
+ vm->retry_timer_ms = VIRTIO_MEM_RETRY_TIMER_MIN_MS;
/* register the virtqueue */
rc = virtio_mem_init_vq(vm);
--
2.23.0
