WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

[Xen-devel] [PATCH 19/21] xenpaging: start xenpaging via config option

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] [PATCH 19/21] xenpaging: start xenpaging via config option
From: Olaf Hering <olaf@xxxxxxxxx>
Date: Fri, 26 Nov 2010 14:49:20 +0100
Delivery-date: Fri, 26 Nov 2010 06:21:36 -0800
Dkim-signature: v=1; a=rsa-sha1; c=relaxed/relaxed; t=1290779363; l=7739; s=domk; d=aepfle.de; h=References:Subject:To:From:Date:X-RZG-CLASS-ID:X-RZG-AUTH; bh=gi/9jzo/ElKo/DIetnl5CnC/s0Y=; b=orqP5pizYXpJGRexdMXaBn7YVN2PT51rBHF0wj4QQDmDe/R45oTB2nH5pxIcpK9SLKs Qb46WmRX7hj3Rv+pClwuAgKxjvEAnjwN1scXHtB/aDx+5uMu3QwUuZ4BRhnNKFwN1B4Fw wNZ8isS49KQC0ErVe3cEMq0LEPvTjExAAXs=
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <20101126134901.384130351@xxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: quilt/0.48-4.4
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>

---
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 |    6 ++
 tools/python/xen/xend/image.py          |   91 ++++++++++++++++++++++++++++++++
 tools/python/xen/xm/create.py           |    5 +
 tools/python/xen/xm/xenapi_create.py    |    1 
 8 files changed, 111 insertions(+)

--- xen-unstable.hg-4.1.22433.orig/tools/examples/xmexample.hvm
+++ xen-unstable.hg-4.1.22433/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
+xenpaging = 42
+
 #-----------------------------------------------------------------------------
 # boot on floppy (a), hard disk (c), Network (n) or CD-ROM (d) 
 # default: hard disk, cd-rom, floppy
--- xen-unstable.hg-4.1.22433.orig/tools/python/README.XendConfig
+++ xen-unstable.hg-4.1.22433/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-4.1.22433.orig/tools/python/README.sxpcfg
+++ xen-unstable.hg-4.1.22433/tools/python/README.sxpcfg
@@ -51,6 +51,7 @@ image
   - vncunused
   (HVM)
   - device_model
+  - xenpaging
   - display
   - xauthority
   - vncconsole
--- xen-unstable.hg-4.1.22433.orig/tools/python/xen/xend/XendConfig.py
+++ xen-unstable.hg-4.1.22433/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-4.1.22433.orig/tools/python/xen/xend/XendDomainInfo.py
+++ xen-unstable.hg-4.1.22433/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 +2403,11 @@ class XendDomainInfo:
                 self.image.destroyDeviceModel()
             except Exception, e:
                 log.exception("Device model destroy failed %s" % str(e))
+            try:
+                log.debug("stopping xenpaging")
+                self.image.destroyXenPaging()
+            except Exception, e:
+                log.exception("stopping xenpaging failed %s" % str(e))
         else:
             log.debug("No device model")
 
--- xen-unstable.hg-4.1.22433.orig/tools/python/xen/xend/image.py
+++ xen-unstable.hg-4.1.22433/tools/python/xen/xend/image.py
@@ -122,12 +122,14 @@ 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')
 
         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 +394,95 @@ 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 == 0:
+            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.mkdir(xenpaging_dir)
+                except:
+                    log.info("mkdir %s failed" % xenpaging_dir)
+                    pass
+                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
+        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-4.1.22433.orig/tools/python/xen/xm/create.py
+++ xen-unstable.hg-4.1.22433/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-4.1.22433.orig/tools/python/xen/xm/xenapi_create.py
+++ xen-unstable.hg-4.1.22433/tools/python/xen/xm/xenapi_create.py
@@ -1085,6 +1085,7 @@ class sxp2xml:
             'acpi',
             'apic',
             'boot',
+            'xenpaging',
             'device_model',
             'loader',
             'fda',


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel