From mboxrd@z Thu Jan 1 00:00:00 1970 From: Umesh Deshpande Subject: [RFC PATCH v2 0/3] separate thread for VM migration Date: Fri, 29 Jul 2011 16:57:23 -0400 Message-ID: Cc: Juan Quintela , mtosatti@redhat.com, pbonzini@redhat.com, Umesh Deshpande To: kvm@vger.kernel.org, qemu-devel@nongnu.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:58278 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752855Ab1G2U5e (ORCPT ); Fri, 29 Jul 2011 16:57:34 -0400 Sender: kvm-owner@vger.kernel.org List-ID: Following patch deals with VCPU and iothread starvation during the migration of a guest. Currently the iothread is responsible for performing the guest migration. It holds qemu_mutex during the migration and doesn't allow VCPU to enter the qemu mode and delays its return to the guest. The guest migration, executed as an iohandler also delays the execution of other iohandlers. In the following patch series, The migration has been moved to a separate thread to reduce the qemu_mutex contention and iohandler starvation. Also current dirty bitmap is split into per memslot bitmap to reduce its size. Umesh Deshpande (3): separate thread for VM migration fine grained qemu_mutex locking for migration per memslot dirty bitmap arch_init.c | 14 ++++++++++-- buffered_file.c | 28 ++++++++++++++++--------- buffered_file.h | 4 +++ cpu-all.h | 40 ++++++++++++++++++++++++++++++------ exec.c | 38 +++++++++++++++++++++------------- migration.c | 60 ++++++++++++++++++++++++++++++++++++++++++++---------- migration.h | 3 ++ savevm.c | 22 +------------------- savevm.h | 29 ++++++++++++++++++++++++++ xen-all.c | 6 +--- 10 files changed, 173 insertions(+), 71 deletions(-) create mode 100644 savevm.h -- 1.7.4.1