[KVM_AUTOTEST] add kvm hugepage variant

["Lukáš Doktor" <ldoktor@redhat.com>]

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After discussion I split the patches.

This patch adds kvm_hugepage variant. It prepares the host system and
start vm with -mem-path option. It does not clean after itself, because 
  it's impossible to unmount and free hugepages before all guests are 
destroyed.

I need to ask you what to do with change of qemu parameter. Newest 
versions are using -mempath insted of -mem-path. This is impossible to 
fix using current config file. I can see 2 solutions:
1) direct change in kvm_vm.py (parse output and try another param)
2) detect qemu capabilities outside and create additional layer (better 
for future occurrence)

Dne 9.7.2009 11:24, Lukáš Doktor napsal(a):
> This patch adds kvm_hugepage variant. It prepares the host system and
> start vm with -mem-path option. It does not clean after itself, because
> it's impossible to unmount and free hugepages before all guests are
> destroyed.
>
> There is also added autotest.libhugetlbfs test.
>
> I need to ask you what to do with change of qemu parameter. Newest
> versions are using -mempath insted of -mem-path. This is impossible to
> fix using current config file. I can see 2 solutions:
> 1) direct change in kvm_vm.py (parse output and try another param)
> 2) detect qemu capabilities outside and create additional layer (better
> for future occurrence)
>
> Tested by:ldoktor@redhat.com on RHEL5.4 with kvm-83-72.el5


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diff -Narup orig/client/tests/kvm/kvm_tests.cfg.sample new/client/tests/kvm/kvm_tests.cfg.sample
--- orig/client/tests/kvm/kvm_tests.cfg.sample	2009-07-08 13:18:07.000000000 +0200
+++ new/client/tests/kvm/kvm_tests.cfg.sample	2009-07-09 10:15:58.000000000 +0200
@@ -546,6 +549,12 @@ variants:
         only default
         image_format = raw
 
+variants:
+    - @kvm_smallpages:
+    - kvm_hugepages:
+        pre_command = "/bin/bash scripts/hugepage.sh /mnt/hugepage"
+        extra_params += " -mem-path /mnt/hugepage"
+
 
 variants:
     - @basic:
@@ -559,6 +568,7 @@ variants:
         only Fedora.8.32
         only install setup boot shutdown
         only rtl8139
+        only kvm_smallpages
     - @sample1:
         only qcow2
         only ide
diff -Narup orig/client/tests/kvm/kvm_vm.py new/client/tests/kvm/kvm_vm.py
--- orig/client/tests/kvm/kvm_vm.py	2009-07-08 13:18:07.000000000 +0200
+++ new/client/tests/kvm/kvm_vm.py	2009-07-09 10:05:19.000000000 +0200
@@ -400,6 +400,13 @@ class VM:
                 self.destroy()
                 return False
 
+            if output:
+                logging.debug("qemu produced some output:\n%s", output)
+                if "alloc_mem_area" in output:
+                    logging.error("Could not allocate hugepage memory"
+                                 " -- qemu command:\n%s", qemu_command)
+                    return False
+
             logging.debug("VM appears to be alive with PID %d", self.pid)
             return True

diff -Narup orig/client/tests/kvm/scripts/hugepage.sh new/client/tests/kvm/scripts/hugepage.sh
--- orig/client/tests/kvm/scripts/hugepage.sh	1970-01-01 01:00:00.000000000 +0100
+++ new/client/tests/kvm/scripts/hugepage.sh	2009-07-09 09:47:14.000000000 +0200
@@ -0,0 +1,34 @@
+#!/bin/bash
+# Alocates enough hugepages and mount hugetlbfs to $1.
+if [ $# -ne 1 ]; then
+	echo "USAGE: $0 mem_path"
+	exit 1
+fi
+
+Hugepagesize=$(grep Hugepagesize /proc/meminfo | cut -d':'  -f 2 | \
+		 xargs | cut -d' ' -f1)
+VMS=$(expr $(echo $KVM_TEST_vms | grep -c ' ') + 1)
+if [ "$KVM_TEST_max_vms" ] && [ "$VMS" -lt "$KVM_TEST_max_vms" ]; then
+        VMS="$KVM_TEST_max_vms"
+fi
+VMSM=$(expr $(expr $VMS \* $KVM_TEST_mem) + $(expr $VMS \* 64 ))
+TARGET=$(expr $VMSM \* 1024 \/ $Hugepagesize)
+
+NR=$(cat /proc/sys/vm/nr_hugepages)
+while [ "$NR" -ne "$TARGET" ]; do
+	NR_="$NR";echo $TARGET > /proc/sys/vm/nr_hugepages
+	sleep 5s
+	NR=$(cat /proc/sys/vm/nr_hugepages)
+	if [ "$NR" -eq "$NR_" ] ; then
+		echo "Can not alocate $TARGET of hugepages"
+		exit 2
+	fi
+done
+
+if [ ! "$(mount | grep /mnt/hugepage |grep hugetlbfs)" ]; then
+	mkdir -p $1
+	mount -t hugetlbfs none $1 || \
+		(echo "Can not mount hugetlbfs filesystem to $1"; exit 3)
+else
+	echo "hugetlbfs filesystem already mounted"
+fi