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migration: Split save_live_pending() into state_pending_*

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We split the function into to:

- state_pending_estimate: We estimate the remaining state size without
  stopping the machine.

- state pending_exact: We calculate the exact amount of remaining
  state.

The only "device" that implements different functions for _estimate()
and _exact() is ram.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Juan Quintela 2022-10-03 02:00:03 +02:00
parent 255dc7af7e
commit c8df4a7aef
13 changed files with 143 additions and 76 deletions
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35
migration/ram.c
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@ -3409,19 +3409,35 @@ static int ram_save_complete(QEMUFile *f, void *opaque)
return 0;
}
static void ram_save_pending(void *opaque, uint64_t max_size,
uint64_t *res_precopy_only,
uint64_t *res_compatible,
uint64_t *res_postcopy_only)
static void ram_state_pending_estimate(void *opaque, uint64_t max_size,
uint64_t *res_precopy_only,
uint64_t *res_compatible,
uint64_t *res_postcopy_only)
{
RAMState **temp = opaque;
RAMState *rs = *temp;
uint64_t remaining_size;
remaining_size = rs->migration_dirty_pages * TARGET_PAGE_SIZE;
uint64_t remaining_size = rs->migration_dirty_pages * TARGET_PAGE_SIZE;
if (!migration_in_postcopy() &&
remaining_size < max_size) {
if (migrate_postcopy_ram()) {
/* We can do postcopy, and all the data is postcopiable */
*res_postcopy_only += remaining_size;
} else {
*res_precopy_only += remaining_size;
}
}
static void ram_state_pending_exact(void *opaque, uint64_t max_size,
uint64_t *res_precopy_only,
uint64_t *res_compatible,
uint64_t *res_postcopy_only)
{
RAMState **temp = opaque;
RAMState *rs = *temp;
uint64_t remaining_size = rs->migration_dirty_pages * TARGET_PAGE_SIZE;
if (!migration_in_postcopy()) {
qemu_mutex_lock_iothread();
WITH_RCU_READ_LOCK_GUARD() {
migration_bitmap_sync_precopy(rs);
@ -4577,7 +4593,8 @@ static SaveVMHandlers savevm_ram_handlers = {
.save_live_complete_postcopy = ram_save_complete,
.save_live_complete_precopy = ram_save_complete,
.has_postcopy = ram_has_postcopy,
.save_live_pending = ram_save_pending,
.state_pending_exact = ram_state_pending_exact,
.state_pending_estimate = ram_state_pending_estimate,
.load_state = ram_load,
.save_cleanup = ram_save_cleanup,
.load_setup = ram_load_setup,