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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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13
migration/block.c
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@ -863,10 +863,10 @@ static int block_save_complete(QEMUFile *f, void *opaque)
return 0;
}
static void block_save_pending(void *opaque, uint64_t max_size,
uint64_t *res_precopy_only,
uint64_t *res_compatible,
uint64_t *res_postcopy_only)
static void block_state_pending(void *opaque, uint64_t max_size,
uint64_t *res_precopy_only,
uint64_t *res_compatible,
uint64_t *res_postcopy_only)
{
/* Estimate pending number of bytes to send */
uint64_t pending;
@ -885,7 +885,7 @@ static void block_save_pending(void *opaque, uint64_t max_size,
pending = BLK_MIG_BLOCK_SIZE;
}
trace_migration_block_save_pending(pending);
trace_migration_block_state_pending(pending);
/* We don't do postcopy */
*res_precopy_only += pending;
}
@ -1020,7 +1020,8 @@ static SaveVMHandlers savevm_block_handlers = {
.save_setup = block_save_setup,
.save_live_iterate = block_save_iterate,
.save_live_complete_precopy = block_save_complete,
.save_live_pending = block_save_pending,
.state_pending_exact = block_state_pending,
.state_pending_estimate = block_state_pending,
.load_state = block_load,
.save_cleanup = block_migration_cleanup,
.is_active = block_is_active,