[RFC PATCH 0/6] qemu: add support for query-stats-schemas

This patch adds an API for query-stats-schemas and uses it to work with the pre-existing API for query-stats to display those stats. [1/6]: This patch adds a simple API for query-stats-schemas and an extractor function to deserialise it into a GHashTable. The GHashTable here is a pair of the name of the stat and the schema for it. Some fields in the latter like the exponent, base and bucket-size are not utilised in this patchset but they will be useful in the subsequent patches which add the support for the histograms. [2/6]: Add query-stats-schemas to the qemu capabilities. [3/6]: This patch adds the schema hashtable to the virDomainObjectPrivate. This decision was made due to QEMU upstream not having vCPUs to generate the schema, so that they could be stored as the file cache. This might be changed in the future if there is workaround upstream or if libvirt ends up using a dummy VM just to query the schema. [4/6]: This patch simply adds a utility function to traverse the schemas to find the object that corresponds to the provided QOM path. [5/6]: This patch adds vCPU stats in addition to the pre-existing ones using a helper function. Histograms are ignored for now but they will be added in the next patchset. [6/6]: This patch adds a new stat worker for QEMU called "Vm" due to the stats being for the "vm" target. It utilises the same helper function as above. Comments are much appreciated. Amneesh Singh (6): qemu_monitor: add qemuMonitorQueryStatsSchema qemu_capabilities: add "query-stats-schemas" QMP command to the QEMU capabilities qemu_domain: add statsSchema to qemuDomainObjPrivate qemu_monitor: add qemuMonitorGetStatsByQOMPath qemu_driver: add the vCPU stats by KVM to the current stats qemu_driver: add new stats worker qemuDomainGetStatsVm include/libvirt/libvirt-domain.h | 1 + src/libvirt-domain.c | 3 + src/qemu/qemu_capabilities.c | 2 + src/qemu/qemu_capabilities.h | 1 + src/qemu/qemu_domain.c | 41 ++++++ src/qemu/qemu_domain.h | 5 + src/qemu/qemu_driver.c | 127 ++++++++++++++++++ src/qemu/qemu_monitor.c | 67 +++++++++ src/qemu/qemu_monitor.h | 39 ++++++ src/qemu/qemu_monitor_json.c | 93 +++++++++++++ src/qemu/qemu_monitor_json.h | 4 + .../caps_7.1.0.x86_64.xml | 1 + tools/virsh-domain-monitor.c | 7 + 13 files changed, 391 insertions(+) -- 2.37.1