248 lines
12 KiB
Python
Executable File
248 lines
12 KiB
Python
Executable File
#!/usr/bin/python2
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# -*- coding: utf-8 -*-
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#
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# The Qubes OS Project, http://www.qubes-os.org
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#
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# Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
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# Copyright (C) 2013 Marek Marczykowski <marmarek@invisiblethingslab.com>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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#
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import xen.lowlevel.xc
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import xen.lowlevel.xs
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import string
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import time
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import qmemman_algo
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import os
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from notify import notify_error_qubes_manager, clear_error_qubes_manager
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no_progress_msg="VM refused to give back requested memory"
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slow_memset_react_msg="VM didn't give back all requested memory"
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class DomainState:
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def __init__(self, id):
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self.meminfo = None #dictionary of memory info read from client
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self.memory_actual = None #the current memory size
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self.memory_maximum = None #the maximum memory size
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self.mem_used = None #used memory, computed based on meminfo
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self.id = id #domain id
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self.last_target = 0 #the last memset target
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self.no_progress = False #no react to memset
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self.slow_memset_react = False #slow react to memset (after few tries still above target)
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class SystemState:
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def __init__(self):
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self.domdict = {}
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self.xc = xen.lowlevel.xc.xc()
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self.xs = xen.lowlevel.xs.xs()
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self.BALOON_DELAY = 0.1
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self.XEN_FREE_MEM_LEFT = 50*1024*1024
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self.XEN_FREE_MEM_MIN = 25*1024*1024
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self.ALL_PHYS_MEM = self.xc.physinfo()['total_memory']*1024
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def add_domain(self, id):
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self.domdict[id] = DomainState(id)
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def del_domain(self, id):
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self.domdict.pop(id)
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def get_free_xen_memory(self):
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return self.xc.physinfo()['free_memory']*1024
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# hosts = self.xend_session.session.xenapi.host.get_all()
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# host_record = self.xend_session.session.xenapi.host.get_record(hosts[0])
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# host_metrics_record = self.xend_session.session.xenapi.host_metrics.get_record(host_record["metrics"])
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# ret = host_metrics_record["memory_free"]
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# return long(ret)
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#refresh information on memory assigned to all domains
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def refresh_memactual(self):
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for domain in self.xc.domain_getinfo():
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id = str(domain['domid'])
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if self.domdict.has_key(id):
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self.domdict[id].memory_actual = domain['mem_kb']*1024
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self.domdict[id].memory_maximum = self.xs.read('', '/local/domain/%s/memory/static-max' % str(id))
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if self.domdict[id].memory_maximum:
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self.domdict[id].memory_maximum = int(self.domdict[id].memory_maximum)*1024
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else:
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self.domdict[id].memory_maximum = self.ALL_PHYS_MEM
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# the previous line used to be
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# self.domdict[id].memory_maximum = domain['maxmem_kb']*1024
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# but domain['maxmem_kb'] changes in self.mem_set as well, and this results in
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# the memory never increasing
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# in fact, the only possible case of nonexisting memory/static-max is dom0
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# see #307
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def clear_outdated_error_markers(self):
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# Clear outdated errors
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for i in self.domdict.keys():
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if self.domdict[i].slow_memset_react and \
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self.domdict[i].memory_actual <= self.domdict[i].last_target + self.XEN_FREE_MEM_LEFT/4:
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dom_name = self.xs.read('', '/local/domain/%s/name' % str(i))
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if dom_name is not None:
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clear_error_qubes_manager(dom_name, slow_memset_react_msg)
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self.domdict[i].slow_memset_react = False
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if self.domdict[i].no_progress and \
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self.domdict[i].memory_actual <= self.domdict[i].last_target + self.XEN_FREE_MEM_LEFT/4:
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dom_name = self.xs.read('', '/local/domain/%s/name' % str(i))
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if dom_name is not None:
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clear_error_qubes_manager(dom_name, no_progress_msg)
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self.domdict[i].no_progress = False
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#the below works (and is fast), but then 'xm list' shows unchanged memory value
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def mem_set(self, id, val):
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print 'mem-set domain', id, 'to', val
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self.domdict[id].last_target = val
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#can happen in the middle of domain shutdown
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#apparently xc.lowlevel throws exceptions too
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try:
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self.xc.domain_setmaxmem(int(id), int(val/1024) + 1024) # LIBXL_MAXMEM_CONSTANT=1024
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self.xc.domain_set_target_mem(int(id), int(val/1024))
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except:
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pass
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self.xs.write('', '/local/domain/' + id + '/memory/target', str(int(val/1024)))
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# this is called at the end of ballooning, when we have Xen free mem already
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# make sure that past mem_set will not decrease Xen free mem
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def inhibit_balloon_up(self):
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for i in self.domdict.keys():
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dom = self.domdict[i]
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if dom.memory_actual is not None and dom.memory_actual + 200*1024 < dom.last_target:
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print "Preventing balloon up to", dom.last_target
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self.mem_set(i, dom.memory_actual)
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#perform memory ballooning, across all domains, to add "memsize" to Xen free memory
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def do_balloon(self, memsize):
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MAX_TRIES = 20
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niter = 0
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prev_memory_actual = None
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for i in self.domdict.keys():
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self.domdict[i].no_progress = False
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print "do_balloon start"
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while True:
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self.refresh_memactual()
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xenfree = self.get_free_xen_memory()
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print 'got xenfree=', xenfree
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if xenfree >= memsize + self.XEN_FREE_MEM_MIN:
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self.inhibit_balloon_up()
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return True
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if prev_memory_actual is not None:
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for i in prev_memory_actual.keys():
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if prev_memory_actual[i] == self.domdict[i].memory_actual:
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#domain not responding to memset requests, remove it from donors
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self.domdict[i].no_progress = True
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print 'domain', i, 'stuck at', self.domdict[i].memory_actual
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memset_reqs = qmemman_algo.balloon(memsize + self.XEN_FREE_MEM_LEFT - xenfree, self.domdict)
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print 'requests:', memset_reqs
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if niter > MAX_TRIES or len(memset_reqs) == 0:
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return False
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prev_memory_actual = {}
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for i in memset_reqs:
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dom, mem = i
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self.mem_set(dom, mem)
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prev_memory_actual[dom] = self.domdict[dom].memory_actual
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time.sleep(self.BALOON_DELAY)
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niter = niter + 1
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def refresh_meminfo(self, domid, untrusted_meminfo_key):
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qmemman_algo.refresh_meminfo_for_domain(self.domdict[domid], untrusted_meminfo_key)
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self.do_balance()
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#is the computed balance request big enough ?
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#so that we do not trash with small adjustments
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def is_balance_req_significant(self, memset_reqs, xenfree):
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total_memory_transfer = 0
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MIN_TOTAL_MEMORY_TRANSFER = 150*1024*1024
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MIN_MEM_CHANGE_WHEN_UNDER_PREF = 15*1024*1024
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# If xenfree to low, return immediately
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if self.XEN_FREE_MEM_LEFT - xenfree > MIN_MEM_CHANGE_WHEN_UNDER_PREF:
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return True
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for rq in memset_reqs:
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dom, mem = rq
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last_target = self.domdict[dom].last_target
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memory_change = mem - last_target
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total_memory_transfer += abs(memory_change)
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pref = qmemman_algo.prefmem(self.domdict[dom])
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if last_target > 0 and last_target < pref and memory_change > MIN_MEM_CHANGE_WHEN_UNDER_PREF:
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print 'dom', dom, 'is below pref, allowing balance'
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return True
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return total_memory_transfer + abs(xenfree - self.XEN_FREE_MEM_LEFT) > MIN_TOTAL_MEMORY_TRANSFER
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def print_stats(self, xenfree, memset_reqs):
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for i in self.domdict.keys():
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if self.domdict[i].meminfo is not None:
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print 'dom' , i, 'act/pref', self.domdict[i].memory_actual, qmemman_algo.prefmem(self.domdict[i])
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print 'xenfree=', xenfree, 'balance req:', memset_reqs
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def do_balance(self):
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if os.path.isfile('/var/run/qubes/do-not-membalance'):
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return
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self.refresh_memactual()
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self.clear_outdated_error_markers()
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xenfree = self.get_free_xen_memory()
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memset_reqs = qmemman_algo.balance(xenfree - self.XEN_FREE_MEM_LEFT, self.domdict)
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if not self.is_balance_req_significant(memset_reqs, xenfree):
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return
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self.print_stats(xenfree, memset_reqs)
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prev_memactual = {}
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for i in self.domdict.keys():
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prev_memactual[i] = self.domdict[i].memory_actual
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for rq in memset_reqs:
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dom, mem = rq
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# Force to always have at least 0.9*self.XEN_FREE_MEM_LEFT (some
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# margin for rounding errors). Before giving memory to
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# domain, ensure that others have gived it back.
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# If not - wait a little.
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ntries = 5
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while self.get_free_xen_memory() - (mem - self.domdict[dom].memory_actual) < 0.9*self.XEN_FREE_MEM_LEFT:
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time.sleep(self.BALOON_DELAY)
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ntries -= 1
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if ntries <= 0:
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# Waiting haven't helped; Find which domain get stuck and
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# abort balance (after distributing what we have)
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self.refresh_memactual()
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for rq2 in memset_reqs:
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dom2, mem2 = rq2
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if dom2 == dom:
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# All donors have been procesed
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break
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# allow some small margin
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if self.domdict[dom2].memory_actual > self.domdict[dom2].last_target + self.XEN_FREE_MEM_LEFT/4:
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# VM didn't react to memory request at all, remove from donors
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if prev_memactual[dom2] == self.domdict[dom2].memory_actual:
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print 'dom %s didnt react to memory request (holds %d, requested balloon down to %d)' % (dom2, self.domdict[dom2].memory_actual, mem2)
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self.domdict[dom2].no_progress = True
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dom_name = self.xs.read('', '/local/domain/%s/name' % str(dom2))
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if dom_name is not None:
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notify_error_qubes_manager(str(dom_name), no_progress_msg)
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else:
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print 'dom %s still hold more memory than have assigned (%d > %d)' % (dom2, self.domdict[dom2].memory_actual, mem2)
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self.domdict[dom2].slow_memset_react = True
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dom_name = self.xs.read('', '/local/domain/%s/name' % str(dom2))
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if dom_name is not None:
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notify_error_qubes_manager(str(dom_name), slow_memset_react_msg)
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self.mem_set(dom, self.get_free_xen_memory() + self.domdict[dom].memory_actual - self.XEN_FREE_MEM_LEFT)
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return
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self.mem_set(dom, mem)
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# for i in self.domdict.keys():
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# print 'domain ', i, ' meminfo=', self.domdict[i].meminfo, 'actual mem', self.domdict[i].memory_actual
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# print 'domain ', i, 'actual mem', self.domdict[i].memory_actual
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# print 'xen free mem', self.get_free_xen_memory()
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