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qmemman: when balooning, make sure that past mem-set will not steal memory

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This commit is contained in:
Rafal Wojtczuk 2011-07-22 13:40:21 +02:00
parent 2fc5d190fd
commit 9192a42b91
1 changed files with 12 additions and 1 deletions
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13
dom0/qmemman/qmemman.py
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@ -81,6 +81,15 @@ class SystemState:
except XenAPI.Failure: except XenAPI.Failure:
pass pass
# this is called at the end of ballooning, when we have Xen free mem already
# make sure that past mem_set will not decrease Xen free mem
def inhibit_balloon_up(self):
for i in self.domdict.keys():
dom = self.domdict[i]
if dom.memory_actual is not None and dom.memory_actual + 200*1024 < dom.last_target:
print "Preventing balloon up to", dom.last_target
self.mem_set(i, dom.memory_actual)
#perform memory ballooning, across all domains, to add "memsize" to Xen free memory #perform memory ballooning, across all domains, to add "memsize" to Xen free memory
def do_balloon(self, memsize): def do_balloon(self, memsize):
MAX_TRIES = 20 MAX_TRIES = 20
@ -88,12 +97,14 @@ class SystemState:
prev_memory_actual = None prev_memory_actual = None
for i in self.domdict.keys(): for i in self.domdict.keys():
self.domdict[i].no_progress = False self.domdict[i].no_progress = False
print "do_balloon start"
while True: while True:
self.refresh_memactual()
xenfree = self.get_free_xen_memory() xenfree = self.get_free_xen_memory()
print 'got xenfree=', xenfree print 'got xenfree=', xenfree
if xenfree >= memsize + self.XEN_FREE_MEM_MIN: if xenfree >= memsize + self.XEN_FREE_MEM_MIN:
self.inhibit_balloon_up()
return True return True
self.refresh_memactual()
if prev_memory_actual is not None: if prev_memory_actual is not None:
for i in prev_memory_actual.keys(): for i in prev_memory_actual.keys():
if prev_memory_actual[i] == self.domdict[i].memory_actual: if prev_memory_actual[i] == self.domdict[i].memory_actual: