parallelvirtualcluster/pvc
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Use memalloc for target selection

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Uses the new memalloc ZK data to calculate the most free target
hypervisor during migrations. Also functionizes the selection
to avoid code duplication and facilitate adding alternate search
functions in the future.

Addresses #9
This commit is contained in:
Joshua Boniface
2018-07-18 01:53:30 -04:00
parent d3cb8d4a13
commit d8962bf998
2 changed files with 79 additions and 48 deletions
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52
pvc.py
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@ -354,6 +354,44 @@ def verifyNode(zk_conn, node):
click.echo('ERROR: No node named "{}" is present in the cluster.'.format(node))
exit(1)
def findTargetHypervisor(zk_conn, search_field, dom_uuid, this_node)
if search_field == 'mem':
return findTargetHypervisorMem(zk_conn, dom_uuid, this_node)
return None
def findTargetHypervisorMem(zk_conn, dom_uuid, this_node):
# Find a target node
most_allocfree = 0
target_hypervisor = None
hypervisor_list = zkhandler.listchildren(zk_conn, '/nodes')
current_hypervisor = zkhandler.readdata(zk_conn, '/domains/{}/hypervisor'.format(dom_uuid))
if current_hypervisor != this_node:
continue
for hypervisor in hypervisor_list:
daemon_state = zkhandler.readdata(zk_conn, '/nodes/{}/daemonstate'.format(hypervisor))
domain_state = zkhandler.readdata(zk_conn, '/nodes/{}/domainstate'.format(hypervisor))
if hypervisor == current_hypervisor:
continue
if daemon_state != 'run' or domain_state != 'ready':
continue
memalloc = int(zkhandler.readdata(zk_conn, '/nodes/{}/memalloc'.format(hypervisor)))
memused = int(zkhandler.readdata(zk_conn, '/nodes/{}/memused'.format(hypervisor)))
memfree = int(zkhandler.readdata(zk_conn, '/nodes/{}/memfree'.format(hypervisor)))
memtotal = memused + memfree
allocfree = memtotal - memalloc
if allocfree > most_allocfree:
most_allocfree = allocfree
target_hypervisor = hypervisor
return target_hypervisor
########################
########################
@ -945,19 +983,7 @@ def move_vm(domain, target_hypervisor):
current_hypervisor = zk_conn.get('/domains/{}/hypervisor'.format(dom_uuid))[0].decode('ascii')
if target_hypervisor == None:
# Determine the best hypervisor to migrate the VM to based on active memory usage
hypervisor_list = zk_conn.get_children('/nodes')
most_memfree = 0
for hypervisor in hypervisor_list:
daemon_state = zk_conn.get('/nodes/{}/daemonstate'.format(hypervisor))[0].decode('ascii')
domain_state = zk_conn.get('/nodes/{}/domainstate'.format(hypervisor))[0].decode('ascii')
if daemon_state != 'run' or domain_state != 'ready' or hypervisor == current_hypervisor:
continue
memfree = int(zk_conn.get('/nodes/{}/memfree'.format(hypervisor))[0].decode('ascii'))
if memfree > most_memfree:
most_memfree = memfree
target_hypervisor = hypervisor
target_hypervisor = findTargetHypervisor(zk_conn, 'mem', dom_uuid, current_hypervisor)
else:
if target_hypervisor == current_hypervisor:
click.echo('ERROR: The VM "{}" is already running on hypervisor "{}".'.format(dom_uuid, current_hypervisor))