def initialize_guests():
"""
Initialize guests (fill their memories with specified patterns).
"""
logging.info("Phase 1: filling guest memory pages")
for session in lsessions:
vm = lvms[lsessions.index(session)]
logging.debug("Turning off swap on vm %s", vm.name)
session.cmd("swapoff -a", timeout=300)
# Start the allocator
_start_allocator(vm, session, 60 * perf_ratio)
# Execute allocator on guests
for i in range(0, vmsc):
vm = lvms[i]
a_cmd = "mem = MemFill(%d, %s, %s)" % (ksm_size, skeys[i], dkeys[i])
_execute_allocator(a_cmd, vm, lsessions[i], 60 * perf_ratio)
a_cmd = "mem.value_fill(%d)" % skeys[0]
_execute_allocator(a_cmd, vm, lsessions[i], 120 * perf_ratio)
# Let ksm_overcommit_guest.py do its job
# (until shared mem reaches expected value)
shm = 0
j = 0
logging.debug("Target shared meminfo for guest %s: %s", vm.name,
ksm_size)
while ((new_ksm and (shm < (ksm_size*(i+1)))) or
(not new_ksm and (shm < (ksm_size)))):
if j > 64:
logging.debug(virt_test_utils.get_memory_info(lvms))
raise error.TestError("SHM didn't merge the memory until "
"the DL on guest: %s" % vm.name)
st = ksm_size / 200 * perf_ratio
logging.debug("Waiting %ds before proceeding...", st)
time.sleep(st)
if (new_ksm):
shm = get_ksmstat()
else:
shm = vm.get_shared_meminfo()
logging.debug("Shared meminfo for guest %s after "
"iteration %s: %s", vm.name, j, shm)
j += 1
# Keep some reserve
rt = ksm_size / 200 * perf_ratio
logging.debug("Waiting %ds before proceeding...", rt)
time.sleep(rt)
logging.debug(virt_test_utils.get_memory_info(lvms))
logging.info("Phase 1: PASS")
def separate_first_guest():
"""
Separate memory of the first guest by generating special random series
"""
logging.info("Phase 2: Split the pages on the first guest")
a_cmd = "mem.static_random_fill()"
data = _execute_allocator(a_cmd, lvms[0], lsessions[0],
120 * perf_ratio)[1]
r_msg = data.splitlines()[-1]
logging.debug("Return message of static_random_fill: %s", r_msg)
out = int(r_msg.split()[4])
logging.debug("Performance: %dMB * 1000 / %dms = %dMB/s", ksm_size, out,
(ksm_size * 1000 / out))
logging.debug(virt_test_utils.get_memory_info(lvms))
logging.debug("Phase 2: PASS")
def split_parallel():
"""
Parallel page spliting
"""
logging.info("Phase 1: parallel page spliting")
# We have to wait until allocator is finished (it waits 5 seconds to
# clean the socket
session = lsessions[0]
vm = lvms[0]
for i in range(1, max_alloc):
lsessions.append(vm.wait_for_login(timeout=360))
session.cmd("swapoff -a", timeout=300)
for i in range(0, max_alloc):
# Start the allocator
_start_allocator(vm, lsessions[i], 60 * perf_ratio)
logging.info("Phase 1: PASS")
logging.info("Phase 2a: Simultaneous merging")
logging.debug("Memory used by allocator on guests = %dMB",
(ksm_size / max_alloc))
for i in range(0, max_alloc):
a_cmd = "mem = MemFill(%d, %s, %s)" % ((ksm_size / max_alloc),
skeys[i], dkeys[i])
_execute_allocator(a_cmd, vm, lsessions[i], 60 * perf_ratio)
a_cmd = "mem.value_fill(%d)" % (skeys[0])
_execute_allocator(a_cmd, vm, lsessions[i], 90 * perf_ratio)
# Wait until ksm_overcommit_guest.py merges the pages (3 * ksm_size / 3)
shm = 0
i = 0
logging.debug("Target shared memory size: %s", ksm_size)
while (shm < ksm_size):
if i > 64:
logging.debug(virt_test_utils.get_memory_info(lvms))
raise error.TestError("SHM didn't merge the memory until DL")
wt = ksm_size / 200 * perf_ratio
logging.debug("Waiting %ds before proceed...", wt)
time.sleep(wt)
if (new_ksm):
shm = get_ksmstat()
else:
shm = vm.get_shared_meminfo()
logging.debug("Shared meminfo after attempt %s: %s", i, shm)
i += 1
logging.debug(virt_test_utils.get_memory_info([vm]))
logging.info("Phase 2a: PASS")
logging.info("Phase 2b: Simultaneous spliting")
# Actual splitting
for i in range(0, max_alloc):
a_cmd = "mem.static_random_fill()"
data = _execute_allocator(a_cmd, vm, lsessions[i],
90 * perf_ratio)[1]
data = data.splitlines()[-1]
logging.debug(data)
out = int(data.split()[4])
logging.debug("Performance: %dMB * 1000 / %dms = %dMB/s",
(ksm_size / max_alloc), out,
(ksm_size * 1000 / out / max_alloc))
logging.debug(virt_test_utils.get_memory_info([vm]))
logging.info("Phase 2b: PASS")
logging.info("Phase 2c: Simultaneous verification")
for i in range(0, max_alloc):
a_cmd = "mem.static_random_verify()"
data = _execute_allocator(a_cmd, vm, lsessions[i],
(mem / 200 * 50 * perf_ratio))[1]
logging.info("Phase 2c: PASS")
logging.info("Phase 2d: Simultaneous merging")
# Actual splitting
for i in range(0, max_alloc):
a_cmd = "mem.value_fill(%d)" % skeys[0]
data = _execute_allocator(a_cmd, vm, lsessions[i],
120 * perf_ratio)[1]
logging.debug(virt_test_utils.get_memory_info([vm]))
logging.info("Phase 2d: PASS")
logging.info("Phase 2e: Simultaneous verification")
for i in range(0, max_alloc):
a_cmd = "mem.value_check(%d)" % skeys[0]
data = _execute_allocator(a_cmd, vm, lsessions[i],
(mem / 200 * 50 * perf_ratio))[1]
logging.info("Phase 2e: PASS")
logging.info("Phase 2f: Simultaneous spliting last 96B")
for i in range(0, max_alloc):
a_cmd = "mem.static_random_fill(96)"
data = _execute_allocator(a_cmd, vm, lsessions[i],
60 * perf_ratio)[1]
data = data.splitlines()[-1]
out = int(data.split()[4])
logging.debug("Performance: %dMB * 1000 / %dms = %dMB/s",
ksm_size/max_alloc, out,
(ksm_size * 1000 / out / max_alloc))
logging.debug(virt_test_utils.get_memory_info([vm]))
logging.info("Phase 2f: PASS")
logging.info("Phase 2g: Simultaneous verification last 96B")
for i in range(0, max_alloc):
a_cmd = "mem.static_random_verify(96)"
(match, data) = _execute_allocator(a_cmd, vm, lsessions[i],
(mem / 200 * 50 * perf_ratio))
logging.debug(virt_test_utils.get_memory_info([vm]))
logging.info("Phase 2g: PASS")
logging.debug("Cleaning up...")
for i in range(0, max_alloc):
lsessions[i].cmd_output("die()", 20)
session.close()
vm.destroy(gracefully = False)
def split_guest():
"""
Sequential split of pages on guests up to memory limit
"""
logging.info("Phase 3a: Sequential split of pages on guests up to "
"memory limit")
last_vm = 0
session = None
vm = None
for i in range(1, vmsc):
# Check VMs
for j in range(0, vmsc):
if not lvms[j].is_alive:
e_msg = ("VM %d died while executing static_random_fill in "
"VM %d on allocator loop" % (j, i))
raise error.TestFail(e_msg)
vm = lvms[i]
session = lsessions[i]
a_cmd = "mem.static_random_fill()"
logging.debug("Executing %s on ksm_overcommit_guest.py loop, "
"vm: %s", a_cmd, vm.name)
session.sendline(a_cmd)
out = ""
try:
logging.debug("Watching host memory while filling vm %s memory",
vm.name)
while not out.startswith("PASS") and not out.startswith("FAIL"):
if not vm.is_alive():
e_msg = ("VM %d died while executing static_random_fill"
" on allocator loop" % i)
raise error.TestFail(e_msg)
free_mem = int(utils.read_from_meminfo("MemFree"))
if (ksm_swap):
free_mem = (free_mem +
int(utils.read_from_meminfo("SwapFree")))
logging.debug("Free memory on host: %d", free_mem)
# We need to keep some memory for python to run.
if (free_mem < 64000) or (ksm_swap and
free_mem < (450000 * perf_ratio)):
vm.monitor.cmd("stop")
for j in range(0, i):
lvms[j].destroy(gracefully = False)
time.sleep(20)
vm.monitor.cmd("c")
logging.debug("Only %s free memory, killing %d guests",
free_mem, (i - 1))
last_vm = i
break
out = session.read_nonblocking(0.1, 1)
time.sleep(2)
except OSError:
logging.debug("Only %s host free memory, killing %d guests",
free_mem, (i - 1))
logging.debug("Stopping %s", vm.name)
vm.monitor.cmd("stop")
for j in range(0, i):
logging.debug("Destroying %s", lvms[j].name)
lvms[j].destroy(gracefully = False)
time.sleep(20)
vm.monitor.cmd("c")
last_vm = i
if last_vm != 0:
break
logging.debug("Memory filled for guest %s", vm.name)
logging.info("Phase 3a: PASS")
logging.info("Phase 3b: Check if memory in max loading guest is right")
for i in range(last_vm + 1, vmsc):
lsessions[i].close()
if i == (vmsc - 1):
logging.debug(virt_test_utils.get_memory_info([lvms[i]]))
logging.debug("Destroying guest %s", lvms[i].name)
lvms[i].destroy(gracefully = False)
# Verify last machine with randomly generated memory
a_cmd = "mem.static_random_verify()"
_execute_allocator(a_cmd, lvms[last_vm], lsessions[last_vm],
(mem / 200 * 50 * perf_ratio))
logging.debug(virt_test_utils.get_memory_info([lvms[last_vm]]))
lsessions[i].cmd_output("die()", 20)
lvms[last_vm].destroy(gracefully = False)
logging.info("Phase 3b: PASS")
if not lvms[i].is_alive():
raise error.TestError("VM %s seems to be dead; Test requires a"
"living VM" % lvms[i].name)
lsessions.append(lvms[i].wait_for_login(timeout=360))
try:
tmp = open(params.get('pid_' + vm_name), 'r')
params['pid_' + vm_name] = int(tmp.readline())
except Exception:
raise error.TestFail("Could not get PID of %s" % (vm_name))
# Let guests rest a little bit :-)
st = vmsc * 2 * perf_ratio
logging.debug("Waiting %ds before proceed", st)
time.sleep(vmsc * 2 * perf_ratio)
logging.debug(virt_test_utils.get_memory_info(lvms))
# Copy ksm_overcommit_guest.py into guests
virt_dir = os.path.join(os.environ['AUTODIR'], 'virt')
vksmd_src = os.path.join(virt_dir, "scripts", "ksm_overcommit_guest.py")
dst_dir = "/tmp"
for vm in lvms:
vm.copy_files_to(vksmd_src, dst_dir)
logging.info("Phase 0: PASS")
if params['ksm_mode'] == "parallel":
logging.info("Starting KSM test parallel mode")
split_parallel()
logging.info("KSM test parallel mode: PASS")
elif params['ksm_mode'] == "serial":
logging.info("Starting KSM test serial mode")