[libvirt] [PATCH 3/3] qemu: Prefer hugepages over mem source='file'
Michal Privoznik
mprivozn at redhat.com
Tue Jun 13 14:26:54 UTC 2017
https://bugzilla.redhat.com/show_bug.cgi?id=1214369
Consider the following XML:
<memoryBacking>
<hugepages>
<page size='2048' unit='KiB' nodeset='1'/>
</hugepages>
<source type='file'/>
<access mode='shared'/>
</memoryBacking>
<numa>
<cell id='0' cpus='0-3' memory='512000' unit='KiB'/>
<cell id='1' cpus='4-7' memory='512000' unit='KiB'/>
</numa>
The following cmd line is generated:
-object
memory-backend-file,id=ram-node0,mem-path=/var/lib/libvirt/qemu/ram,
share=yes,size=524288000 -numa node,nodeid=0,cpus=0-3,memdev=ram-node0
-object
memory-backend-file,id=ram-node1,mem-path=/var/lib/libvirt/qemu/ram,
share=yes,size=524288000 -numa node,nodeid=1,cpus=4-7,memdev=ram-node1
This is obviously wrong as for node 1 hugepages should have been
used. The hugepages configuration is more specific than <source
type='file'/>.
Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
src/qemu/qemu_command.c | 6 +--
.../qemuxml2argv-hugepages-memaccess2.args | 39 ++++++++++++++
.../qemuxml2argv-hugepages-memaccess2.xml | 62 ++++++++++++++++++++++
tests/qemuxml2argvtest.c | 3 ++
.../qemuxml2xmlout-hugepages-memaccess2.xml | 1 +
tests/qemuxml2xmltest.c | 1 +
6 files changed, 109 insertions(+), 3 deletions(-)
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-hugepages-memaccess2.args
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-hugepages-memaccess2.xml
create mode 120000 tests/qemuxml2xmloutdata/qemuxml2xmlout-hugepages-memaccess2.xml
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 088fc7911..3e1552a1b 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3414,9 +3414,9 @@ qemuBuildMemoryBackendStr(virJSONValuePtr *backendProps,
if (VIR_STRDUP(memPath, mem->nvdimmPath) < 0)
goto cleanup;
prealloc = true;
- } else if (def->mem.source == VIR_DOMAIN_MEMORY_SOURCE_FILE) {
- /* We can have both pagesize and mem source,
- * then check mem source first. */
+ } else if (!pagesize && def->mem.source == VIR_DOMAIN_MEMORY_SOURCE_FILE) {
+ /* We can have both pagesize and mem source. If that's the case,
+ * prefer hugepages as those are more specific. */
if (VIR_STRDUP(memPath, cfg->memoryBackingDir) < 0)
goto cleanup;
} else {
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-hugepages-memaccess2.args b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-memaccess2.args
new file mode 100644
index 000000000..11985232a
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-memaccess2.args
@@ -0,0 +1,39 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-i686 \
+-name QEMUGuest1 \
+-S \
+-M pc \
+-m size=4194304k,slots=16,maxmem=8388608k \
+-smp 4,sockets=4,cores=1,threads=1 \
+-object memory-backend-file,id=ram-node0,mem-path=/var/lib/libvirt/qemu/ram,\
+share=no,size=1073741824,host-nodes=0-3,policy=bind \
+-numa node,nodeid=0,cpus=0,memdev=ram-node0 \
+-object memory-backend-file,id=ram-node1,prealloc=yes,\
+mem-path=/dev/hugepages2M/libvirt/qemu/-1-QEMUGuest1,share=yes,size=1073741824,\
+host-nodes=0-3,policy=bind \
+-numa node,nodeid=1,cpus=1,memdev=ram-node1 \
+-object memory-backend-file,id=ram-node2,mem-path=/var/lib/libvirt/qemu/ram,\
+share=no,size=1073741824,host-nodes=0-3,policy=bind \
+-numa node,nodeid=2,cpus=2,memdev=ram-node2 \
+-object memory-backend-file,id=ram-node3,mem-path=/var/lib/libvirt/qemu/ram,\
+share=no,size=1073741824,host-nodes=3,policy=bind \
+-numa node,nodeid=3,cpus=3,memdev=ram-node3 \
+-object memory-backend-file,id=memdimm0,prealloc=yes,\
+mem-path=/dev/hugepages2M/libvirt/qemu/-1-QEMUGuest1,share=yes,size=536870912,\
+host-nodes=0-3,policy=bind \
+-device pc-dimm,node=1,memdev=memdimm0,id=dimm0,slot=0,addr=4294967296 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefaults \
+-monitor unix:/tmp/lib/domain--1-QEMUGuest1/monitor.sock,server,nowait \
+-no-acpi \
+-boot c \
+-usb \
+-drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-ide0-0-0 \
+-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-hugepages-memaccess2.xml b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-memaccess2.xml
new file mode 100644
index 000000000..c0011285c
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-hugepages-memaccess2.xml
@@ -0,0 +1,62 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <maxMemory slots='16' unit='KiB'>8388608</maxMemory>
+ <memory unit='KiB'>4194304</memory>
+ <currentMemory unit='KiB'>4194304</currentMemory>
+ <memoryBacking>
+ <hugepages>
+ <page size='2048' unit='KiB' nodeset='1'/>
+ </hugepages>
+ <source type='file'/>
+ <access mode='private'/>
+ </memoryBacking>
+ <vcpu placement='static'>4</vcpu>
+ <numatune>
+ <memory mode='strict' nodeset='0-3'/>
+ <memnode cellid='3' mode='strict' nodeset='3'/>
+ </numatune>
+ <os>
+ <type arch='i686' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <cpu>
+ <numa>
+ <cell id='0' cpus='0' memory='1048576' unit='KiB'/>
+ <cell id='1' cpus='1' memory='1048576' unit='KiB' memAccess='shared'/>
+ <cell id='2' cpus='2' memory='1048576' unit='KiB' memAccess='private'/>
+ <cell id='3' cpus='3' memory='1048576' unit='KiB'/>
+ </numa>
+ </cpu>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu-system-i686</emulator>
+ <disk type='block' device='disk'>
+ <source dev='/dev/HostVG/QEMUGuest1'/>
+ <target dev='hda' bus='ide'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+ </disk>
+ <controller type='usb' index='0'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
+ </controller>
+ <controller type='ide' index='0'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
+ </controller>
+ <controller type='pci' index='0' model='pci-root'/>
+ <input type='mouse' bus='ps2'/>
+ <input type='keyboard' bus='ps2'/>
+ <memballoon model='virtio'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+ </memballoon>
+ <memory model='dimm'>
+ <target>
+ <size unit='KiB'>524288</size>
+ <node>1</node>
+ </target>
+ <address type='dimm' slot='0' base='0x100000000'/>
+ </memory>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index a1f19437b..43d3f1bd3 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -822,6 +822,9 @@ mymain(void)
DO_TEST("hugepages-memaccess", QEMU_CAPS_OBJECT_MEMORY_FILE,
QEMU_CAPS_OBJECT_MEMORY_RAM, QEMU_CAPS_DEVICE_PC_DIMM,
QEMU_CAPS_NUMA);
+ DO_TEST("hugepages-memaccess2", QEMU_CAPS_OBJECT_MEMORY_FILE,
+ QEMU_CAPS_OBJECT_MEMORY_RAM, QEMU_CAPS_DEVICE_PC_DIMM,
+ QEMU_CAPS_NUMA);
DO_TEST("nosharepages", QEMU_CAPS_MACHINE_OPT, QEMU_CAPS_MEM_MERGE);
DO_TEST("disk-cdrom", NONE);
DO_TEST("disk-iscsi", NONE);
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-hugepages-memaccess2.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-hugepages-memaccess2.xml
new file mode 120000
index 000000000..3f7a38333
--- /dev/null
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-hugepages-memaccess2.xml
@@ -0,0 +1 @@
+../qemuxml2argvdata/qemuxml2argv-hugepages-memaccess2.xml
\ No newline at end of file
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index c804d8a01..1bdd383a5 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -420,6 +420,7 @@ mymain(void)
DO_TEST("hugepages-pages6", NONE);
DO_TEST("hugepages-shared", NONE);
DO_TEST("hugepages-memaccess", NONE);
+ DO_TEST("hugepages-memaccess2", NONE);
DO_TEST("nosharepages", NONE);
DO_TEST("restore-v2", NONE);
DO_TEST("migrate", NONE);
--
2.13.0
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