[libvirt] [RFC PATCH 0/8 v2] Summary on block IO throttle

Changes since V1 - Implement the support to get the block io throttling for a device as read only connection - QMP/HMP. - Split virDomainBlockIoThrottle into two separate functions virDomainSetBlockIoThrottle - Set block I/O limits for a device - Requires a connection in 'write' mode. - Limits (info) structure passed as an input parameter virDomainGetBlockIoThrottle - Get the current block I/O limits for a device - Works on a read-only connection. - Current limits are written to the output parameter (reply). - And Other fixups suggested by Adam Litke, Daniel P. Berrange. - For dynamically allocate the blkiothrottle struct, I will fix it when implement --current --live --config options support. Today libvirt supports the cgroups blkio-controller, which handles proportional shares and throughput/iops limits on host block devices. blkio-controller does not support network file systems (NFS) or other QEMU remote block drivers (curl, Ceph/rbd, sheepdog) since they are not host block devices. QEMU I/O throttling works with all types of drive and can be applied independently to each drive attached to a guest and supports throughput/iops limits. To help add QEMU I/O throttling support to libvirt, we plan to complete it with add new API virDomainBlockIoThrottle(), new command 'blkiothrottle' and Python bindings. Notes: we are sending this series out now(even though they are not completed yet.)because we want to start the review process. #1)#2) features were implemented by Zhi Yong Wu: 1) Enable the blkio throttling in xml when guest is starting up. Add blkio throttling in xml as follows: <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/var/lib/libvirt/images/kvm-one.img'/> <target dev='vda' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> <iotune bps='n'.../> </disk> 2) Enable blkio throttling setting at guest running time. virsh blkiothrottle <domain> <device> [--bps<number>] [--bps_rd<number>] \ [--bps_wr<number>] [--iops<number>] [--iops_rd<number>] [--iops_wr<number>] 3) The support to get the current block i/o throttling for a device - HMP/QMP. virsh blkiothrottle <domain> <device> bps: bps_rd: bps_wr: iops: iops_rd: iops_wr: And I will address feedback and work on the missing features in few days includes: 4) Python binding support for setting blkio throttling. 5) --current --live --config options support to unify the libvirt API. daemon/remote.c | 85 +++++++++++++++++ include/libvirt/libvirt.h.in | 25 +++++ python/generator.py | 2 + python/libvirt-override-api.xml | 16 ++++ python/libvirt-override.c | 43 +++++++++ src/conf/domain_conf.c | 77 ++++++++++++++++ src/conf/domain_conf.h | 11 +++ src/driver.h | 18 ++++ src/libvirt.c | 120 ++++++++++++++++++++++++ src/libvirt_public.syms | 2 + src/qemu/qemu_command.c | 35 +++++++ src/qemu/qemu_driver.c | 108 ++++++++++++++++++++++ src/qemu/qemu_monitor.c | 36 ++++++++ src/qemu/qemu_monitor.h | 10 ++ src/qemu/qemu_monitor_json.c | 191 +++++++++++++++++++++++++++++++++++++++ src/qemu/qemu_monitor_json.h | 10 ++ src/qemu/qemu_monitor_text.c | 88 ++++++++++++++++++ src/qemu/qemu_monitor_text.h | 10 ++ src/remote/remote_driver.c | 81 +++++++++++++++++ src/remote/remote_protocol.x | 39 ++++++++- src/remote_protocol-structs | 34 +++++++ src/util/xml.h | 3 + tools/virsh.c | 100 ++++++++++++++++++++ tools/virsh.pod | 13 +++ 24 files changed, 1156 insertions(+), 1 deletions(-) -- Lei