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migration: Add interface to control compression 

The multiple compression threads can be turned on/off through
qmp and hmp interface before doing live migration.

Signed-off-by: Liang Li <liang.z.li@intel.com>
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Reviewed-by: Dr.David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Liang Li 2015-03-23 16:32:26 +08:00 committed by Juan Quintela
parent 68ae113646
commit dde4e694ae
2 changed files with 15 additions and 3 deletions
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7
migration/migration.c
View File

@ -611,8 +611,11 @@ bool migrate_zero_blocks(void)
bool migrate_use_compression(void)
{
/* Disable compression before the patch series are applied */
return false;
MigrationState *s;
s = migrate_get_current();
return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS];
}
int migrate_compress_level(void)

11
qapi-schema.json
View File

@ -515,13 +515,22 @@
# to enable the capability on the source VM. The feature is disabled by
# default. (since 1.6)
#
# @compress: Use multiple compression threads to accelerate live migration.
# This feature can help to reduce the migration traffic, by sending
# compressed pages. Please note that if compress and xbzrle are both
# on, compress only takes effect in the ram bulk stage, after that,
# it will be disabled and only xbzrle takes effect, this can help to
# minimize migration traffic. The feature is disabled by default.
# (since 2.4 )
#
# @auto-converge: If enabled, QEMU will automatically throttle down the guest
# to speed up convergence of RAM migration. (since 1.6)
#
# Since: 1.2
##
{ 'enum': 'MigrationCapability',
'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks'] }
'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks',
'compress'] }
##
# @MigrationCapabilityStatus