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Re: [virt-tools-list] [PATCH] To support huge-sized page



On 11/30/2011 12:21 AM, Cole Robinson wrote:
On 11/29/2011 05:58 AM, y zhlbj-host collab prod int phx2 redhat com wrote:
From: Li Zhang<zhlcindy linux vnet ibm com>

On some CPU architectures, huge-sized page are supported for
performance boost. However, virt-manager doesn't support the
feature of huge-sized page explicitly.

The patch is addressing the issue. Support of huge-sized page
will be implemented in the Guest object so that the virt-manager
can configure.

Signed-off-by: Li Zhang<zhlcindy linux vnet ibm com>
---
  virtinst/Guest.py |   16 +++++++++++++++-
  1 files changed, 15 insertions(+), 1 deletions(-)

diff --git a/virtinst/Guest.py b/virtinst/Guest.py
index 46ec340..a5d2e56 100644
--- a/virtinst/Guest.py
+++ b/virtinst/Guest.py
@@ -190,6 +190,7 @@ class Guest(XMLBuilderDomain.XMLBuilderDomain):
          self._uuid = None
          self._memory = None
          self._maxmemory = None
+        self._hugepage = None
          self._vcpus = 1
          self._maxvcpus = 1
          self._cpuset = None
@@ -343,6 +344,14 @@ class Guest(XMLBuilderDomain.XMLBuilderDomain):
                                xpath="./memory",
                                get_converter=lambda s, x: int(x) / 1024,
                                set_converter=lambda s, x: int(x) * 1024)
+    def get_hugepage(self):
+        return self._hugepage
+    def set_hugepage(self, val):
+        if val is None:
+            return val
+        self._hugepage = bool(val)
+    hugepage = _xml_property(get_hugepage, set_hugepage,
+                             xpath="./memoryBacking/hugepages", is_bool=True)

      # UUID for the guest
      def get_uuid(self):
@@ -1044,9 +1053,14 @@ class Guest(XMLBuilderDomain.XMLBuilderDomain):
          xml = add(desc_xml)
          xml = add("<memory>%s</memory>" % (self.maxmemory * 1024))
          xml = add("<currentMemory>%s</currentMemory>" % (self.memory * 1024))
+
          #<blkiotune>
          #<memtune>
-        #<memoryBacking>
+        if self.hugepage is True:
+            xml = add("<memoryBacking>")
+            xml = add("<hugepages/>")
+            xml = add("</memoryBacking>")
+
          xml = add(self._get_vcpu_xml())
          #<cputune>
          xml = add(self.numatune.get_xml_config())

Please add some basic tests for this. set this value in
tests/xmlconfig.py:testManyDevices and tests/xmlparse.py:testAlterGuest
so we protect XML generation against basic regressions.

Thanks,
Cole


Hi Cole,

OK. How should I run these test cases by setting the value to
that files?

I tested this value with virt-manager --debug.
And from the log, I can see XML file is created correct.

Thanks,
Li


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