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@xxxxxxxxxx on RHEL5.4 with kvm-83-72.el5
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
