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.

*** BLURB HERE ***

Liu Qing (2):
  conf, docs: Add qcow2 cache configuration support
  qemu: add capability checking for qcow2 cache configuration

 docs/formatdomain.html.in                          | 21 ++++++++++
 docs/schemas/domaincommon.rng                      | 24 +++++++++++
 src/conf/domain_conf.c                             | 30 ++++++++++++++
 src/qemu/qemu_capabilities.c                       | 15 +++++++
 src/qemu/qemu_capabilities.h                       |  3 ++
 src/qemu/qemu_command.c                            | 47 ++++++++++++++++++++++
 src/util/virstoragefile.c                          |  3 ++
 src/util/virstoragefile.h                          |  4 ++
 tests/qemucapabilitiesdata/caps_2.4.0.x86_64.xml   |  2 +
 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 ++
 ...argv-disk-drive-qcow2-cache-clean-interval.args | 27 +++++++++++++
 ...2argv-disk-drive-qcow2-cache-clean-interval.xml | 37 +++++++++++++++++
 ...emuxml2argv-disk-drive-qcow2-l2-cache-size.args | 27 +++++++++++++
 ...qemuxml2argv-disk-drive-qcow2-l2-cache-size.xml | 37 +++++++++++++++++
 ...2argv-disk-drive-qcow2-refcount-cache-size.args | 27 +++++++++++++
 ...l2argv-disk-drive-qcow2-refcount-cache-size.xml | 37 +++++++++++++++++
 tests/qemuxml2argvtest.c                           |  6 +++
 ...mlout-disk-drive-qcow2-cache-clean-interval.xml | 41 +++++++++++++++++++
 ...muxml2xmlout-disk-drive-qcow2-l2-cache-size.xml | 41 +++++++++++++++++++
 ...xmlout-disk-drive-qcow2-refcount-cache-size.xml | 41 +++++++++++++++++++
 tests/qemuxml2xmltest.c                            |  3 ++
 32 files changed, 509 insertions(+)
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-cache-clean-interval.args
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-cache-clean-interval.xml
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-l2-cache-size.args
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-l2-cache-size.xml
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-refcount-cache-size.args
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-refcount-cache-size.xml
 create mode 100644 tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-cache-clean-interval.xml
 create mode 100644 tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-l2-cache-size.xml
 create mode 100644 tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-refcount-cache-size.xml

-- 
1.8.3.1

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