* Liang Li (liang.z...@intel.com) wrote:
> The multiple compression threads can be turned on/off through
> qmp and hmp interface when doing live migration.
>
> Signed-off-by: Liang Li <liang.z...@intel.com>
> Signed-off-by: Yang Zhang <yang.z.zh...@intel.com>
> ---
> migration.c | 7 +++++--
> qapi-schema.json | 6 +++++-
> 2 files changed, 10 insertions(+), 3 deletions(-)
>
Reviewed-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
> diff --git a/migration.c b/migration.c
> index 082ddb7..9d1613d 100644
> --- a/migration.c
> +++ b/migration.c
> @@ -576,8 +576,11 @@ bool migrate_zero_blocks(void)
>
> bool migrate_use_compression(void)
> {
> - /* Disable compression before the series of patches are applied */
> - return false;
> + MigrationState *s;
> +
> + s = migrate_get_current();
> +
> + return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS];
> }
>
> int migrate_compress_level(void)
> diff --git a/qapi-schema.json b/qapi-schema.json
> index 9ffdcf8..d371af3 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -491,13 +491,17 @@
> # to enable the capability on the source VM. The feature is
> disabled by
> # default. (since 1.6)
> #
> +# @compress: Using the multiple compression threads to accelerate live
> migration.
> +# This feature can help to reduce the migration traffic, by sending
> +# compressed pages. The feature is disabled by default. (since 2.3)
> +#
> # @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
> --
> 1.8.3.1
>
--
Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
