Resctrl support in libvirt currently associates allocations and monitors
with a set of vCPUs. This does not account for resource consumption by
QEMU IOThreads, worker threads and emulator threads.

Allow cachetune, memorytune, energytune and their monitor elements to
omit the vcpus attribute and apply to the whole QEMU process. Assigning
the emulator process to the resctrl group before it creates threads lets
all subsequently created threads inherit the same configuration.

Whole-process and per-vCPU allocations cannot be mixed within a domain.
A monitor without vcpus inherits its enclosing allocation's scope. Thus,
it monitors the whole process under a whole-process allocation and the
allocation's vCPU set under a per-vCPU allocation.

This series was previously posted as:

https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/thread/QFXZZOHRSAUIUZYANHKRAXPBDQH2OSKM/

Changes since v1:
- Rebased onto current master.
- Split the independent resctrl domstats fixes into a separate series.
- Added Christopher's Reviewed-by.
- Dropped the NEWS patch.

Jedrzej Wasiukiewicz (4):
  conf: allow omitting vcpus in cachetune/memorytune/energytune
  conf: implement whole-process resctrl scope
  qemu: assign whole-process resctrl groups at domain start
  qemu: omit vcpus for whole-process resctrl monitor stats

 docs/formatdomain.rst                         |  57 +++--
 src/conf/domain_conf.c                        | 231 ++++++++++++------
 src/conf/domain_conf.h                        |   2 +
 src/conf/schemas/domaincommon.rng             |  48 ++--
 src/qemu/qemu_driver.c                        |  24 +-
 src/qemu/qemu_process.c                       |  40 ++-
 src/util/virresctrl.c                         |  10 +-
 .../cachetune-monitor-empty-vcpus.xml         |  30 +++
 .../cachetune-monitor-inherit-alloc.xml       |  30 +++
 .../cachetune-wholeprocess-duplicate.xml      |  32 +++
 ...chetune-wholeprocess-monitor-duplicate.xml |  31 +++
 .../cachetune-wholeprocess-monitors.xml       |  31 +++
 .../energytune-colliding-monitor.xml          |  30 +++
 .../energytune-wholeprocess.xml               |  29 +++
 .../memorytune-wholeprocess.xml               |  29 +++
 .../resctrl-wholeprocess-alloc-monitor.xml    |  32 +++
 .../resctrl-wholeprocess-layering.xml         |  32 +++
 .../resctrl-wholeprocess-monitors.xml         |  33 +++
 .../cachetune-monitor-inherit-alloc.xml       |  30 +++
 tests/genericxml2xmltest.c                    |  11 +
 20 files changed, 662 insertions(+), 130 deletions(-)
 create mode 100644 tests/genericxml2xmlindata/cachetune-monitor-empty-vcpus.xml
 create mode 100644 tests/genericxml2xmlindata/cachetune-monitor-inherit-alloc.xml
 create mode 100644 tests/genericxml2xmlindata/cachetune-wholeprocess-duplicate.xml
 create mode 100644 tests/genericxml2xmlindata/cachetune-wholeprocess-monitor-duplicate.xml
 create mode 100644 tests/genericxml2xmlindata/cachetune-wholeprocess-monitors.xml
 create mode 100644 tests/genericxml2xmlindata/energytune-colliding-monitor.xml
 create mode 100644 tests/genericxml2xmlindata/energytune-wholeprocess.xml
 create mode 100644 tests/genericxml2xmlindata/memorytune-wholeprocess.xml
 create mode 100644 tests/genericxml2xmlindata/resctrl-wholeprocess-alloc-monitor.xml
 create mode 100644 tests/genericxml2xmlindata/resctrl-wholeprocess-layering.xml
 create mode 100644 tests/genericxml2xmlindata/resctrl-wholeprocess-monitors.xml
 create mode 100644 tests/genericxml2xmloutdata/cachetune-monitor-inherit-alloc.xml

--
2.43.0
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