From patchwork Fri Jun 14 13:58:56 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chegu Vinod X-Patchwork-Id: 251437 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 436402C0098 for ; Sat, 15 Jun 2013 00:02:16 +1000 (EST) Received: from localhost ([::1]:55690 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UnUZy-0002Fb-EO for incoming@patchwork.ozlabs.org; Fri, 14 Jun 2013 10:02:14 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49827) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UnUY2-0008Ej-16 for qemu-devel@nongnu.org; Fri, 14 Jun 2013 10:00:15 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UnUXr-0004ph-OV for qemu-devel@nongnu.org; Fri, 14 Jun 2013 10:00:13 -0400 Received: from g1t0026.austin.hp.com ([15.216.28.33]:19209) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UnUXr-0004h1-Hk for qemu-devel@nongnu.org; Fri, 14 Jun 2013 10:00:03 -0400 Received: from g1t0039.austin.hp.com (g1t0039.austin.hp.com [16.236.32.45]) by g1t0026.austin.hp.com (Postfix) with ESMTP id 80E5AC0A5; Fri, 14 Jun 2013 13:59:57 +0000 (UTC) Received: from saber460s7.usa.hp.com (saber460s7.usa.hp.com [15.198.40.37]) by g1t0039.austin.hp.com (Postfix) with ESMTP id F4200343D7; Fri, 14 Jun 2013 13:59:56 +0000 (UTC) From: Chegu Vinod To: eblake@redhat.com, anthony@codemonkey.ws, quintela@redhat.com, owasserm@redhat.com, pbonzini@redhat.com, qemu-devel@nongnu.org Date: Fri, 14 Jun 2013 06:58:56 -0700 Message-Id: <1371218337-51891-3-git-send-email-chegu_vinod@hp.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1371218337-51891-1-git-send-email-chegu_vinod@hp.com> References: <1371218337-51891-1-git-send-email-chegu_vinod@hp.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x X-Received-From: 15.216.28.33 Cc: chegu_vinod@hp.com Subject: [Qemu-devel] [RFC PATCH v6 2/3] Add 'auto-converge' migration capability X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org The auto-converge migration capability allows the user to specify if they choose live migration seqeunce to automatically detect and force convergence. Signed-off-by: Chegu Vinod Reviewed-by: Paolo Bonzini Reviewed-by: Eric Blake --- include/migration/migration.h | 2 ++ migration.c | 9 +++++++++ qapi-schema.json | 5 ++++- 3 files changed, 15 insertions(+), 1 deletions(-) diff --git a/include/migration/migration.h b/include/migration/migration.h index e2acec6..ace91b0 100644 --- a/include/migration/migration.h +++ b/include/migration/migration.h @@ -127,4 +127,6 @@ int migrate_use_xbzrle(void); int64_t migrate_xbzrle_cache_size(void); int64_t xbzrle_cache_resize(int64_t new_size); + +bool migrate_auto_converge(void); #endif diff --git a/migration.c b/migration.c index 058f9e6..d0759c1 100644 --- a/migration.c +++ b/migration.c @@ -473,6 +473,15 @@ void qmp_migrate_set_downtime(double value, Error **errp) max_downtime = (uint64_t)value; } +bool migrate_auto_converge(void) +{ + MigrationState *s; + + s = migrate_get_current(); + + return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE]; +} + int migrate_use_xbzrle(void) { MigrationState *s; diff --git a/qapi-schema.json b/qapi-schema.json index 5ad6894..882a7fd 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -605,10 +605,13 @@ # This feature allows us to minimize migration traffic for certain work # loads, by sending compressed difference of the pages # +# @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'] } + 'data': ['xbzrle', 'auto-converge'] } ## # @MigrationCapabilityStatus