diff options
| author | Liang Li | 2015-11-05 04:51:03 +0100 |
|---|---|---|
| committer | Paolo Bonzini | 2015-11-05 11:28:10 +0100 |
| commit | 0fd7e098db30e302d27920487f0afec33be8982a (patch) | |
| tree | 87cfe5cc1dc319430ae507e6ecf76199b349e9b3 /scripts | |
| parent | configure: disable FORTIFY_SOURCE under clang (diff) | |
| download | qemu-0fd7e098db30e302d27920487f0afec33be8982a.tar.gz qemu-0fd7e098db30e302d27920487f0afec33be8982a.tar.xz qemu-0fd7e098db30e302d27920487f0afec33be8982a.zip | |
kvmclock: add a new function to update env->tsc.
The commit 317b0a6d8 fixed an issue which caused by the outdated
env->tsc value, but the fix lead to 'cpu_synchronize_all_states()'
called twice during live migration. The 'cpu_synchronize_all_states()'
takes about 130us for a VM which has 4 vcpus, it's a bit expensive.
Synchronize the whole CPU context just for updating env->tsc is too
wasting, this patch use a new function to update the env->tsc.
Comparing to 'cpu_synchronize_all_states()', it only takes about 20us.
Signed-off-by: Liang Li <liang.z.li@intel.com>
Message-Id: <1446695464-27116-2-git-send-email-liang.z.li@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'scripts')
0 files changed, 0 insertions, 0 deletions