Start xenpaging via config option.
TODO: add config option for different pagefile directory
TODO: add libxl support
TODO: parse config values like 42K, 42M, 42G, 42%
Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
---
v3:
move debug for stopping xenpaging to destroyXenPaging
v2:
unlink logfile instead of truncating it.
allows hardlinking for further inspection
tools/examples/xmexample.hvm | 3 +
tools/python/README.XendConfig | 1
tools/python/README.sxpcfg | 1
tools/python/xen/xend/XendConfig.py | 3 +
tools/python/xen/xend/XendDomainInfo.py | 5 +
tools/python/xen/xend/image.py | 87 ++++++++++++++++++++++++++++++++
tools/python/xen/xm/create.py | 5 +
tools/python/xen/xm/xenapi_create.py | 1
8 files changed, 106 insertions(+)
--- xen-unstable.hg-4.1.22571.orig/tools/examples/xmexample.hvm
+++ xen-unstable.hg-4.1.22571/tools/examples/xmexample.hvm
@@ -127,6 +127,9 @@ disk = [ 'file:/var/images/min-el3-i386.
# Device Model to be used
device_model = 'qemu-dm'
+# xenpaging, number of pages, or -1 for entire guest memory range
+xenpaging = 42
+
#-----------------------------------------------------------------------------
# boot on floppy (a), hard disk (c), Network (n) or CD-ROM (d)
# default: hard disk, cd-rom, floppy
--- xen-unstable.hg-4.1.22571.orig/tools/python/README.XendConfig
+++ xen-unstable.hg-4.1.22571/tools/python/README.XendConfig
@@ -120,6 +120,7 @@ otherConfig
image.vncdisplay
image.vncunused
image.hvm.device_model
+ image.hvm.xenpaging
image.hvm.display
image.hvm.xauthority
image.hvm.vncconsole
--- xen-unstable.hg-4.1.22571.orig/tools/python/README.sxpcfg
+++ xen-unstable.hg-4.1.22571/tools/python/README.sxpcfg
@@ -51,6 +51,7 @@ image
- vncunused
(HVM)
- device_model
+ - xenpaging
- display
- xauthority
- vncconsole
--- xen-unstable.hg-4.1.22571.orig/tools/python/xen/xend/XendConfig.py
+++ xen-unstable.hg-4.1.22571/tools/python/xen/xend/XendConfig.py
@@ -147,6 +147,7 @@ XENAPI_PLATFORM_CFG_TYPES = {
'apic': int,
'boot': str,
'device_model': str,
+ 'xenpaging': int,
'loader': str,
'display' : str,
'fda': str,
@@ -508,6 +509,8 @@ class XendConfig(dict):
self['platform']['nomigrate'] = 0
if self.is_hvm():
+ if 'xenpaging' not in self['platform']:
+ self['platform']['xenpaging'] = None
if 'timer_mode' not in self['platform']:
self['platform']['timer_mode'] = 1
if 'viridian' not in self['platform']:
--- xen-unstable.hg-4.1.22571.orig/tools/python/xen/xend/XendDomainInfo.py
+++ xen-unstable.hg-4.1.22571/tools/python/xen/xend/XendDomainInfo.py
@@ -2390,6 +2390,7 @@ class XendDomainInfo:
if self.image:
self.image.createDeviceModel()
+ self.image.createXenPaging()
#if have pass-through devs, need the virtual pci slots info from qemu
self.pci_device_configure_boot()
@@ -2402,6 +2403,10 @@ class XendDomainInfo:
self.image.destroyDeviceModel()
except Exception, e:
log.exception("Device model destroy failed %s" % str(e))
+ try:
+ self.image.destroyXenPaging()
+ except Exception, e:
+ log.exception("stopping xenpaging failed %s" % str(e))
else:
log.debug("No device model")
--- xen-unstable.hg-4.1.22571.orig/tools/python/xen/xend/image.py
+++ xen-unstable.hg-4.1.22571/tools/python/xen/xend/image.py
@@ -122,12 +122,16 @@ class ImageHandler:
self.vm.permissionsVm("image/cmdline", { 'dom': self.vm.getDomid(),
'read': True } )
self.device_model = vmConfig['platform'].get('device_model')
+ self.xenpaging = vmConfig['platform'].get('xenpaging')
+ if self.xenpaging == 0:
+ self.xenpaging = None
self.display = vmConfig['platform'].get('display')
self.xauthority = vmConfig['platform'].get('xauthority')
self.vncconsole = int(vmConfig['platform'].get('vncconsole', 0))
self.dmargs = self.parseDeviceModelArgs(vmConfig)
self.pid = None
+ self.xenpaging_pid = None
rtc_timeoffset = int(vmConfig['platform'].get('rtc_timeoffset', 0))
if int(vmConfig['platform'].get('localtime', 0)):
if time.localtime(time.time())[8]:
@@ -392,6 +396,89 @@ class ImageHandler:
sentinel_fifos_inuse[sentinel_path_fifo] = 1
self.sentinel_path_fifo = sentinel_path_fifo
+ def createXenPaging(self):
+ if self.xenpaging is None:
+ return
+ if self.xenpaging_pid:
+ return
+ xenpaging_bin = auxbin.pathTo("xenpaging")
+ args = [xenpaging_bin]
+ args = args + ([ "%d" % self.vm.getDomid()])
+ args = args + ([ "%s" % self.xenpaging])
+ env = dict(os.environ)
+ self.xenpaging_logfile = "/var/log/xen/xenpaging-%s.log" %
str(self.vm.info['name_label'])
+ logfile_mode = os.O_WRONLY|os.O_CREAT|os.O_APPEND|os.O_TRUNC
+ null = os.open("/dev/null", os.O_RDONLY)
+ try:
+ os.unlink(self.xenpaging_logfile)
+ except:
+ pass
+ logfd = os.open(self.xenpaging_logfile, logfile_mode, 0644)
+ sys.stderr.flush()
+ contract = osdep.prefork("%s:%d" % (self.vm.getName(),
self.vm.getDomid()))
+ xenpaging_pid = os.fork()
+ if xenpaging_pid == 0: #child
+ try:
+ xenpaging_dir = "/var/lib/xen/xenpaging"
+ osdep.postfork(contract)
+ os.dup2(null, 0)
+ os.dup2(logfd, 1)
+ os.dup2(logfd, 2)
+ try:
+ os.chdir(xenpaging_dir)
+ except:
+ log.warn("chdir %s failed" % xenpaging_dir)
+ try:
+ log.info("starting %s" % args)
+ os.execve(xenpaging_bin, args, env)
+ except Exception, e:
+ print >>sys.stderr, (
+ 'failed to execute xenpaging: %s: %s' %
+ xenpaging_bin, utils.exception_string(e))
+ os._exit(126)
+ except Exception, e:
+ log.warn("staring xenpaging in %s failed" % xenpaging_dir)
+ os._exit(127)
+ else:
+ osdep.postfork(contract, abandon=True)
+ self.xenpaging_pid = xenpaging_pid
+ os.close(null)
+ os.close(logfd)
+
+ def destroyXenPaging(self):
+ if self.xenpaging is None:
+ return
+ log.debug("stopping xenpaging")
+ if self.xenpaging_pid:
+ try:
+ os.kill(self.xenpaging_pid, signal.SIGHUP)
+ except OSError, exn:
+ log.exception(exn)
+ for i in xrange(100):
+ try:
+ (p, rv) = os.waitpid(self.xenpaging_pid, os.WNOHANG)
+ if p == self.xenpaging_pid:
+ break
+ except OSError:
+ # This is expected if Xend has been restarted within
+ # the life of this domain. In this case, we can kill
+ # the process, but we can't wait for it because it's
+ # not our child. We continue this loop, and after it is
+ # terminated make really sure the process is going away
+ # (SIGKILL).
+ pass
+ time.sleep(0.1)
+ else:
+ log.warning("xenpaging %d took more than 10s "
+ "to terminate: sending SIGKILL" %
self.xenpaging_pid)
+ try:
+ os.kill(self.xenpaging_pid, signal.SIGKILL)
+ os.waitpid(self.xenpaging_pid, 0)
+ except OSError:
+ # This happens if the process doesn't exist.
+ pass
+ self.xenpaging_pid = None
+
def createDeviceModel(self, restore = False):
if self.device_model is None:
return
--- xen-unstable.hg-4.1.22571.orig/tools/python/xen/xm/create.py
+++ xen-unstable.hg-4.1.22571/tools/python/xen/xm/create.py
@@ -491,6 +491,10 @@ gopts.var('nfs_root', val="PATH",
fn=set_value, default=None,
use="Set the path of the root NFS directory.")
+gopts.var('xenpaging', val='NUM',
+ fn=set_int, default=None,
+ use="Number of pages to swap.")
+
gopts.var('device_model', val='FILE',
fn=set_value, default=None,
use="Path to device model program.")
@@ -1076,6 +1080,7 @@ def configure_hvm(config_image, vals):
args = [ 'acpi', 'apic',
'boot',
'cpuid', 'cpuid_check',
+ 'xenpaging',
'device_model', 'display',
'fda', 'fdb',
'gfx_passthru', 'guest_os_type',
--- xen-unstable.hg-4.1.22571.orig/tools/python/xen/xm/xenapi_create.py
+++ xen-unstable.hg-4.1.22571/tools/python/xen/xm/xenapi_create.py
@@ -1085,6 +1085,7 @@ class sxp2xml:
'acpi',
'apic',
'boot',
+ 'xenpaging',
'device_model',
'loader',
'fda',
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