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| author | Liang Li <liang.z.li@intel.com> | 2015-11-05 11:51:03 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-11-05 11:28:10 +0100 |
| commit | 0fd7e098db30e302d27920487f0afec33be8982a (patch) | |
| tree | 87cfe5cc1dc319430ae507e6ecf76199b349e9b3 /qtest.c | |
| parent | b553a0428014636bce4951098e97c60dc18a83ed (diff) | |
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The commit 317b0a6d8 fixed an issue which caused by the outdated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 'qtest.c')
0 files changed, 0 insertions, 0 deletions