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softmmu/dirtylimit: Implement dirty page rate limit

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Implement dirtyrate calculation periodically basing on
dirty-ring and throttle virtual CPU until it reachs the quota
dirty page rate given by user.

Introduce qmp commands "set-vcpu-dirty-limit",
"cancel-vcpu-dirty-limit", "query-vcpu-dirty-limit"
to enable, disable, query dirty page limit for virtual CPU.

Meanwhile, introduce corresponding hmp commands
"set_vcpu_dirty_limit", "cancel_vcpu_dirty_limit",
"info vcpu_dirty_limit" so the feature can be more usable.

"query-vcpu-dirty-limit" success depends on enabling dirty
page rate limit, so just add it to the list of skipped
command to ensure qmp-cmd-test run successfully.

Signed-off-by: Hyman Huang(黄勇) <huangy81@chinatelecom.cn>
Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-Id: <4143f26706d413dd29db0b672fe58b3d3fbe34bc.1656177590.git.huangy81@chinatelecom.cn>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Hyman Huang(黄勇) 2022-06-26 01:38:36 +08:00 • committed by Dr. David Alan Gilbert
parent baa609832e
commit f3b2e38cfb
6 changed files with 324 additions and 0 deletions
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80
qapi/migration.json
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@ -1868,6 +1868,86 @@
##
{ 'command': 'query-dirty-rate', 'returns': 'DirtyRateInfo' }
##
# @DirtyLimitInfo:
#
# Dirty page rate limit information of a virtual CPU.
#
# @cpu-index: index of a virtual CPU.
#
# @limit-rate: upper limit of dirty page rate (MB/s) for a virtual
# CPU, 0 means unlimited.
#
# @current-rate: current dirty page rate (MB/s) for a virtual CPU.
#
# Since: 7.1
#
##
{ 'struct': 'DirtyLimitInfo',
'data': { 'cpu-index': 'int',
'limit-rate': 'uint64',
'current-rate': 'uint64' } }
##
# @set-vcpu-dirty-limit:
#
# Set the upper limit of dirty page rate for virtual CPUs.
#
# Requires KVM with accelerator property "dirty-ring-size" set.
# A virtual CPU's dirty page rate is a measure of its memory load.
# To observe dirty page rates, use @calc-dirty-rate.
#
# @cpu-index: index of a virtual CPU, default is all.
#
# @dirty-rate: upper limit of dirty page rate (MB/s) for virtual CPUs.
#
# Since: 7.1
#
# Example:
# {"execute": "set-vcpu-dirty-limit"}
# "arguments": { "dirty-rate": 200,
# "cpu-index": 1 } }
#
##
{ 'command': 'set-vcpu-dirty-limit',
'data': { '*cpu-index': 'int',
'dirty-rate': 'uint64' } }
##
# @cancel-vcpu-dirty-limit:
#
# Cancel the upper limit of dirty page rate for virtual CPUs.
#
# Cancel the dirty page limit for the vCPU which has been set with
# set-vcpu-dirty-limit command. Note that this command requires
# support from dirty ring, same as the "set-vcpu-dirty-limit".
#
# @cpu-index: index of a virtual CPU, default is all.
#
# Since: 7.1
#
# Example:
# {"execute": "cancel-vcpu-dirty-limit"}
# "arguments": { "cpu-index": 1 } }
#
##
{ 'command': 'cancel-vcpu-dirty-limit',
'data': { '*cpu-index': 'int'} }
##
# @query-vcpu-dirty-limit:
#
# Returns information about virtual CPU dirty page rate limits, if any.
#
# Since: 7.1
#
# Example:
# {"execute": "query-vcpu-dirty-limit"}
#
##
{ 'command': 'query-vcpu-dirty-limit',
'returns': [ 'DirtyLimitInfo' ] }
##
# @snapshot-save:
#