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qmemman: add some comments about new condition for failing request

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QubesOS/qubes-issues#1136
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Marek Marczykowski-Górecki 2015-10-09 19:29:15 +02:00
parent f6fdec08f2
commit 2d8a8094ed
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1 changed files with 7 additions and 0 deletions
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qmemman/qmemman.py
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@ -145,8 +145,13 @@ class SystemState(object):
for i in self.domdict.keys(): for i in self.domdict.keys():
self.domdict[i].no_progress = False self.domdict[i].no_progress = False
#: number of loop iterations for CHECK_PERIOD_S seconds
check_period = max(1, int((CHECK_PERIOD_S + 0.0) / self.BALOON_DELAY)) check_period = max(1, int((CHECK_PERIOD_S + 0.0) / self.BALOON_DELAY))
#: number of free memory bytes expected to get during CHECK_PERIOD_S
#: seconds
check_delta = CHECK_PERIOD_S * CHECK_MB_S * 1024 * 1024 check_delta = CHECK_PERIOD_S * CHECK_MB_S * 1024 * 1024
#: helper array for holding free memory size, CHECK_PERIOD_S seconds
#: ago, at every loop iteration
xenfree_ring = [0] * check_period xenfree_ring = [0] * check_period
while True: while True:
@ -157,6 +162,8 @@ class SystemState(object):
if xenfree >= memsize + self.XEN_FREE_MEM_MIN: if xenfree >= memsize + self.XEN_FREE_MEM_MIN:
self.inhibit_balloon_up() self.inhibit_balloon_up()
return True return True
# fail the request if over past CHECK_PERIOD_S seconds,
# we got less than CHECK_MB_S MB/s on average
ring_slot = niter % check_period ring_slot = niter % check_period
if niter >= check_period and xenfree < xenfree_ring[ring_slot] + check_delta: if niter >= check_period and xenfree < xenfree_ring[ring_slot] + check_delta:
return False return False