Commit dde4e694 authored by Liang Li's avatar Liang Li Committed by Juan Quintela
Browse files

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: default avatarLiang Li <liang.z.li@intel.com>
Signed-off-by: default avatarYang Zhang <yang.z.zhang@intel.com>
Reviewed-by: default avatarDr.David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: default avatarEric Blake <eblake@redhat.com>
Signed-off-by: default avatarJuan Quintela <quintela@redhat.com>
parent 68ae1136

migration/migration.c

+5 −2
Original line number Diff line number Diff line
@@ -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)

qapi-schema.json

+10 −1
Original line number Diff line number Diff line
@@ -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