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migration: prepare to access s->state outside critical sections

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Accessing s->state outside the big QEMU lock will simplify a bit the
locking/unlocking of the iothread lock.

We need to keep the lock in migrate_fd_error and migrate_fd_completed,
however, because they call migrate_fd_cleanup.

Reviewed-by: Orit Wasserman <owasserm@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-02-22 17:36:20 +01:00 committed by Juan Quintela
parent c09e5bb1d8
commit f4410a5d99
1 changed files with 21 additions and 12 deletions
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33
migration.c
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@ -279,19 +279,25 @@ static void migrate_fd_cleanup(MigrationState *s)
notifier_list_notify(&migration_state_notifiers, s);
}
static void migrate_finish_set_state(MigrationState *s, int new_state)
{
if (__sync_val_compare_and_swap(&s->state, MIG_STATE_ACTIVE,
new_state) == new_state) {
trace_migrate_set_state(new_state);
}
}
void migrate_fd_error(MigrationState *s)
{
DPRINTF("setting error state\n");
s->state = MIG_STATE_ERROR;
trace_migrate_set_state(MIG_STATE_ERROR);
migrate_finish_set_state(s, MIG_STATE_ERROR);
migrate_fd_cleanup(s);
}
static void migrate_fd_completed(MigrationState *s)
{
DPRINTF("setting completed state\n");
s->state = MIG_STATE_COMPLETED;
trace_migrate_set_state(MIG_STATE_COMPLETED);
migrate_finish_set_state(s, MIG_STATE_COMPLETED);
migrate_fd_cleanup(s);
}
@ -316,13 +322,9 @@ static ssize_t migrate_fd_put_buffer(MigrationState *s, const void *data,
static void migrate_fd_cancel(MigrationState *s)
{
if (s->state != MIG_STATE_ACTIVE)
return;
DPRINTF("cancelling migration\n");
s->state = MIG_STATE_CANCELLED;
trace_migrate_set_state(MIG_STATE_CANCELLED);
migrate_finish_set_state(s, MIG_STATE_CANCELLED);
migrate_fd_cleanup(s);
}
@ -657,12 +659,14 @@ static void *buffered_file_thread(void *opaque)
qemu_mutex_lock_iothread();
DPRINTF("beginning savevm\n");
qemu_savevm_state_begin(s->file, &s->params);
qemu_mutex_unlock_iothread();
while (s->state == MIG_STATE_ACTIVE) {
int64_t current_time;
uint64_t pending_size;
if (s->bytes_xfer < s->xfer_limit) {
qemu_mutex_lock_iothread();
DPRINTF("iterate\n");
pending_size = qemu_savevm_state_pending(s->file, max_size);
DPRINTF("pending size %lu max %lu\n", pending_size, max_size);
@ -678,8 +682,9 @@ static void *buffered_file_thread(void *opaque)
qemu_savevm_state_complete(s->file);
last_round = true;
}
qemu_mutex_unlock_iothread();
}
qemu_mutex_unlock_iothread();
current_time = qemu_get_clock_ms(rt_clock);
if (current_time >= initial_time + BUFFER_DELAY) {
uint64_t transferred_bytes = s->bytes_xfer;
@ -706,14 +711,18 @@ static void *buffered_file_thread(void *opaque)
sleep_time += qemu_get_clock_ms(rt_clock) - current_time;
}
buffered_flush(s);
qemu_mutex_lock_iothread();
if (qemu_file_get_error(s->file)) {
qemu_mutex_lock_iothread();
migrate_fd_error(s);
qemu_mutex_unlock_iothread();
} else if (last_round && s->buffer_size == 0) {
qemu_mutex_lock_iothread();
migrate_fd_completed(s);
qemu_mutex_unlock_iothread();
}
}
qemu_mutex_lock_iothread();
if (s->state == MIG_STATE_COMPLETED) {
int64_t end_time = qemu_get_clock_ms(rt_clock);
s->total_time = end_time - s->total_time;
@ -725,8 +734,8 @@ static void *buffered_file_thread(void *opaque)
vm_start();
}
}
qemu_mutex_unlock_iothread();
g_free(s->buffer);
return NULL;
}