From: Liang Li <liang.z.li@intel.com>
To: qemu-devel@nongnu.org
Cc: pbonzini@redhat.com, mtosatti@redhat.com, m.gibula@beyond.pl,
Liang Li <liang.z.li@intel.com>
Subject: [Qemu-devel] [RESEND 0/2] Optimze the env->tsc update operation
Date: Thu, 29 Oct 2015 16:22:05 +0800 [thread overview]
Message-ID: <1446106927-15490-1-git-send-email-liang.z.li@intel.com> (raw)
This patch aims for reducing the live migration downtime. It updates
the env->tsc value when stopping kvmclock with a ligth weight interface,
rather than using 'cpu_synchronize_all_states', which takes more time.
For a VM with 4 CPUs, this path can help to reduce the VM downtime about
100us.
Liang Li (2):
kvmclock: use a light weight interface to update env->tsc.
Revert "Introduce cpu_clean_all_dirty"
cpus.c | 9 ---------
hw/i386/kvm/clock.c | 26 +++++++++-----------------
include/sysemu/cpus.h | 1 -
include/sysemu/kvm.h | 8 --------
kvm-all.c | 5 -----
target-i386/kvm.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
target-i386/kvm_i386.h | 1 +
7 files changed, 56 insertions(+), 40 deletions(-)
--
1.9.1
next reply other threads:[~2015-10-29 8:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-29 8:22 Liang Li [this message]
2015-10-29 8:22 ` [Qemu-devel] [RESEND 1/2] kvmclock: use a light weight interface to update env->tsc Liang Li
2015-11-02 15:04 ` Paolo Bonzini
2015-11-02 15:11 ` Li, Liang Z
2015-10-29 8:22 ` [Qemu-devel] [RESEND 2/2] Revert "Introduce cpu_clean_all_dirty" Liang Li
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