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
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+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)
+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