[libvirt] [PATCH v4 0/2] Add support for qcow2 cache

[Liu Qing]

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 v3: a) copy qcow2 cache configurion from source to backing
                    to backing file source.
Liu Qing (2):
  conf, docs: Add qcow2 cache configuration support
  qemu: add capability checking for qcow2 cache configuration

 docs/formatdomain.html.in                          | 43 ++++++++++
 docs/schemas/domaincommon.rng                      | 35 ++++++++
 src/conf/domain_conf.c                             | 95 +++++++++++++++++++++-
 src/qemu/qemu_capabilities.c                       |  9 ++
 src/qemu/qemu_capabilities.h                       |  3 +
 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, 386 insertions(+), 1 deletion(-)
 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

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1.8.3.1