On Wed, Jul 29, 2020 at 03:54:46PM +0300, Denis Plotnikov wrote:
> > Besides current solution, do you think we can make it simpler by only
> > deliver
> > the fault request to the background thread? We can let the background
> > thread
> > to do all the rests and IIUC we can drop all the
On 29.07.2020 16:27, Dr. David Alan Gilbert wrote:
...
/**
* ram_find_and_save_block: finds a dirty page and sends it to f
*
@@ -1782,6 +2274,7 @@ static int ram_find_and_save_block(RAMState *rs, bool
last_stage)
pss.block = rs->last_seen_block;
pss.page =
* Denis Plotnikov (dplotni...@virtuozzo.com) wrote:
>
>
> On 27.07.2020 19:48, Dr. David Alan Gilbert wrote:
> > * Denis Plotnikov (dplotni...@virtuozzo.com) wrote:
> ...
> > > +static void page_fault_thread_stop(void)
> > > +{
> > > +if (page_fault_fd) {
> > > +close(page_fault_fd);
On 24.07.2020 03:08, Peter Xu wrote:
On Wed, Jul 22, 2020 at 11:11:32AM +0300, Denis Plotnikov wrote:
+/**
+ * ram_copy_page: make a page copy
+ *
+ * Used in the background snapshot to make a copy of a memeory page.
+ * Ensures that the memeory page is copied only once.
+ * When a page copy
On 24.07.2020 01:15, Peter Xu wrote:
On Wed, Jul 22, 2020 at 11:11:32AM +0300, Denis Plotnikov wrote:
+static void *background_snapshot_thread(void *opaque)
+{
+MigrationState *m = opaque;
+QIOChannelBuffer *bioc;
+QEMUFile *fb;
+int res = 0;
+
+rcu_register_thread();
+
+
On 27.07.2020 19:48, Dr. David Alan Gilbert wrote:
* Denis Plotnikov (dplotni...@virtuozzo.com) wrote:
...
+static void page_fault_thread_stop(void)
+{
+if (page_fault_fd) {
+close(page_fault_fd);
+page_fault_fd = 0;
+}
I think you need to do that after you've done
* Denis Plotnikov (dplotni...@virtuozzo.com) wrote:
> By the moment, making a vm snapshot may cause a significant vm downtime,
> depending on the vm RAM size and the performance of disk storing
> the vm snapshot. This happens because the VM has to be paused until all
> vmstate including RAM is
On Wed, Jul 22, 2020 at 11:11:32AM +0300, Denis Plotnikov wrote:
> +/**
> + * ram_copy_page: make a page copy
> + *
> + * Used in the background snapshot to make a copy of a memeory page.
> + * Ensures that the memeory page is copied only once.
> + * When a page copy is done, restores read/write
On Wed, Jul 22, 2020 at 11:11:32AM +0300, Denis Plotnikov wrote:
> +static void *background_snapshot_thread(void *opaque)
> +{
> +MigrationState *m = opaque;
> +QIOChannelBuffer *bioc;
> +QEMUFile *fb;
> +int res = 0;
> +
> +rcu_register_thread();
> +
> +
By the moment, making a vm snapshot may cause a significant vm downtime,
depending on the vm RAM size and the performance of disk storing
the vm snapshot. This happens because the VM has to be paused until all
vmstate including RAM is written.
To reduce the downtime, the background snapshot
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