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migration/xbzrle: add encoding rate

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Users may need to check the xbzrle encoding rate to know if the guest
memory is xbzrle encoding-friendly, and dynamically turn off the
encoding if the encoding rate is low.

Signed-off-by: Yi Sun <yi.y.sun@intel.com>
Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Message-Id: <1588208375-19556-1-git-send-email-wei.w.wang@intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Wei Wang 2020-04-30 08:59:35 +08:00 • committed by Dr. David Alan Gilbert
parent 59c59c67ee
commit e460a4b1a4
4 changed files with 44 additions and 3 deletions
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5
qapi/migration.json
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@ -70,6 +70,8 @@
#
# @cache-miss-rate: rate of cache miss (since 2.1)
#
# @encoding-rate: rate of encoded bytes (since 5.1)
#
# @overflow: number of overflows
#
# Since: 1.2
@ -77,7 +79,7 @@
{ 'struct': 'XBZRLECacheStats',
'data': {'cache-size': 'int', 'bytes': 'int', 'pages': 'int',
'cache-miss': 'int', 'cache-miss-rate': 'number',
'overflow': 'int' } }
'encoding-rate': 'number', 'overflow': 'int' } }
##
# @CompressionStats:
@ -337,6 +339,7 @@
# "pages":2444343,
# "cache-miss":2244,
# "cache-miss-rate":0.123,
# "encoding-rate":80.1,
# "overflow":34434
# }
# }