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authorLiang Li <liang.z.li@intel.com>2015-11-05 11:51:03 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2015-11-05 11:28:10 +0100
commit0fd7e098db30e302d27920487f0afec33be8982a (patch)
tree87cfe5cc1dc319430ae507e6ecf76199b349e9b3 /aio-win32.c
parentb553a0428014636bce4951098e97c60dc18a83ed (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The commit 317b0a6d8 fixed an issue which caused by the outdated env-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 'aio-win32.c')
0 files changed, 0 insertions, 0 deletions