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authorDavid Hildenbrand <david@redhat.com>2020-05-07 17:01:34 +0300
committerMichael S. Tsirkin <mst@redhat.com>2020-06-04 22:36:52 +0300
commit23e77b5dc9cd88709c48ada936c07bdd72c49426 (patch)
treebd2cb9aec8630c04e727bc1dc5c0c45a9eb70a24 /drivers/virtio
parenta573238786f8f16aca6946fc7b804b965e3038e9 (diff)
downloadlinux-23e77b5dc9cd88709c48ada936c07bdd72c49426.tar.xz
virtio-mem: Better retry handling
Let's start with a retry interval of 5 seconds and double the time until we reach 5 minutes, in case we keep getting errors. Reset the retry interval in case we succeeded. The two main reasons for having to retry are - The hypervisor is busy and cannot process our request - We cannot reach the desired requested_size (esp., not enough memory can get unplugged because we can't allocate any subblocks). Tested-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Michal Hocko <mhocko@kernel.org> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Dave Young <dyoung@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Pavel Tatashin <pasha.tatashin@soleen.com> Cc: Stefan Hajnoczi <stefanha@redhat.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: David Hildenbrand <david@redhat.com> Link: https://lore.kernel.org/r/20200507140139.17083-11-david@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio')
-rw-r--r--drivers/virtio/virtio_mem.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index a2edb87e5ed8..eb4c16d634e0 100644
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c
@@ -141,7 +141,9 @@ 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 50000
+#define VIRTIO_MEM_RETRY_TIMER_MAX_MS 300000
/* Memory notifier (online/offline events). */
struct notifier_block memory_notifier;
@@ -1550,6 +1552,7 @@ retry:
switch (rc) {
case 0:
+ vm->retry_timer_ms = VIRTIO_MEM_RETRY_TIMER_MIN_MS;
break;
case -ENOSPC:
/*
@@ -1565,8 +1568,7 @@ retry:
*/
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:
@@ -1586,6 +1588,8 @@ static enum hrtimer_restart virtio_mem_timer_expired(struct hrtimer *timer)
retry_timer);
virtio_mem_retry(vm);
+ vm->retry_timer_ms = min_t(unsigned int, vm->retry_timer_ms * 2,
+ VIRTIO_MEM_RETRY_TIMER_MAX_MS);
return HRTIMER_NORESTART;
}
@@ -1754,6 +1758,7 @@ 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);