From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48920) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YiJkj-0006A8-Kl for qemu-devel@nongnu.org; Wed, 15 Apr 2015 05:37:02 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YiJke-0004w8-MY for qemu-devel@nongnu.org; Wed, 15 Apr 2015 05:37:01 -0400 Received: from mga11.intel.com ([192.55.52.93]:41439) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YiJke-0004vp-G3 for qemu-devel@nongnu.org; Wed, 15 Apr 2015 05:36:56 -0400 From: Liang Li Date: Wed, 15 Apr 2015 17:26:20 +0800 Message-Id: <1429089983-24644-12-git-send-email-liang.z.li@intel.com> In-Reply-To: <1429089983-24644-1-git-send-email-liang.z.li@intel.com> References: <1429089983-24644-1-git-send-email-liang.z.li@intel.com> Subject: [Qemu-devel] [v8 11/14] migration: Add interface to control compression List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: quintela@redhat.com, Liang Li , armbru@redhat.com, lcapitulino@redhat.com, yang.z.zhang@intel.com, amit.shah@redhat.com, dgilbert@redhat.com The multiple compression threads can be turned on/off through qmp and hmp interface before doing live migration. Signed-off-by: Liang Li Signed-off-by: Yang Zhang Reviewed-by: Dr.David Alan Gilbert Reviewed-by: Juan Quintela Reviewed-by: Eric Blake --- migration/migration.c | 7 +++++-- qapi-schema.json | 11 ++++++++++- 2 files changed, 15 insertions(+), 3 deletions(-) diff --git a/migration/migration.c b/migration/migration.c index 19409e6..dc7db87 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -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) diff --git a/qapi-schema.json b/qapi-schema.json index ac9594d..b117008 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -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 2.3) +# # @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 -- 1.9.1