Qcow2 small IO random write performance will drop dramatically if the l2
cache table could not cover the whole disk. This will be a lot of l2
cache table RW operations if cache miss happens frequently.
This patch exports the qcow2 driver parameter
l2-cache-size/refcount-cache-size, first added in Qemu 2.2, and
cache-clean-interval, first added in Qemu 2.5, in libvirt.
change since v4: updated doc and did code adjustment based on John
Ferlan's review.
Liu Qing (2):
conf, docs: Add qcow2 cache configuration support
qemu: add capability checking for qcow2 cache configuration
docs/formatdomain.html.in | 41 +++++++++
docs/schemas/domaincommon.rng | 35 ++++++++
src/conf/domain_conf.c | 96 ++++++++++++++++++++--
src/qemu/qemu_capabilities.c | 11 +++
src/qemu/qemu_capabilities.h | 5 ++
src/qemu/qemu_command.c | 33 ++++++++
src/qemu/qemu_driver.c | 5 ++
src/util/virstoragefile.c | 3 +
src/util/virstoragefile.h | 6 ++
tests/qemucapabilitiesdata/caps_2.5.0.x86_64.xml | 3 +
.../caps_2.6.0-gicv2.aarch64.xml | 3 +
.../caps_2.6.0-gicv3.aarch64.xml | 3 +
tests/qemucapabilitiesdata/caps_2.6.0.ppc64le.xml | 3 +
tests/qemucapabilitiesdata/caps_2.6.0.x86_64.xml | 3 +
tests/qemucapabilitiesdata/caps_2.7.0.s390x.xml | 3 +
tests/qemucapabilitiesdata/caps_2.7.0.x86_64.xml | 3 +
tests/qemucapabilitiesdata/caps_2.8.0.s390x.xml | 3 +
tests/qemucapabilitiesdata/caps_2.8.0.x86_64.xml | 3 +
tests/qemucapabilitiesdata/caps_2.9.0.ppc64le.xml | 3 +
tests/qemucapabilitiesdata/caps_2.9.0.s390x.xml | 3 +
tests/qemucapabilitiesdata/caps_2.9.0.x86_64.xml | 3 +
.../qemuxml2argv-disk-drive-qcow2-cache.args | 28 +++++++
.../qemuxml2argv-disk-drive-qcow2-cache.xml | 43 ++++++++++
tests/qemuxml2argvtest.c | 4 +
.../qemuxml2xmlout-disk-drive-qcow2-cache.xml | 43 ++++++++++
tests/qemuxml2xmltest.c | 1 +
26 files changed, 385 insertions(+), 5 deletions(-)
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-cache.args
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-cache.xml
create mode 100644 tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-cache.xml
--
1.8.3.1
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