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[Qemu-devel] [v2 0/2] Optimize the env->tsc update operation


From: Liang Li
Subject: [Qemu-devel] [v2 0/2] Optimize the env->tsc update operation
Date: Thu, 5 Nov 2015 11:51:02 +0800

This patch set aims for reducing the live migration downtime. It
updates the env->tsc when stopping kvmclock with a new function.
Rather than using 'cpu_synchronize_all_states()', which updates the
whole CPU context just for updating the env->tsc.

For a VM with 4 CPUs, this patch set can help to reduce the VM downtime
about 100us.

Changes in v2:
  * Simplify 'kvm_get_tsc()' function.
  * Introduce a new function 'kvm_synchronize_all_tsc()'

Liang Li (2):
  kvmclock: add a new function to update env->tsc.
  Revert "Introduce cpu_clean_all_dirty"

 cpus.c                 |  9 ---------
 hw/i386/kvm/clock.c    | 18 ++----------------
 include/sysemu/cpus.h  |  1 -
 include/sysemu/kvm.h   |  8 --------
 kvm-all.c              |  5 -----
 target-i386/kvm.c      | 45 +++++++++++++++++++++++++++++++++++++++++++++
 target-i386/kvm_i386.h |  1 +
 7 files changed, 48 insertions(+), 39 deletions(-)

-- 
1.9.1




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