| commit | 0fd7e098db30e302d27920487f0afec33be8982a | |
| author | Liang Li <liang.z.li@intel.com> | |
| Thu, 5 Nov 2015 03:51:03 +0000 (5 11:51 +0800) | ||
| committer | Paolo Bonzini <pbonzini@redhat.com> | |
| Thu, 5 Nov 2015 10:28:10 +0000 (5 11:28 +0100) | ||
| tree | 87cfe5cc1dc319430ae507e6ecf76199b349e9b3 | treesnapshot (tar.gz zip) |
| parent | b553a0428014636bce4951098e97c60dc18a83ed | commitdiff |
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The commit 317b0a6d8 fixed an issue which caused by the outdated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>
The commit 317b0a6d8 fixed an issue which caused by the outdated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>
| hw/i386/kvm/clock.c | diffblobblamehistory | |
| target-i386/kvm.c | diffblobblamehistory | |
| target-i386/kvm_i386.h | diffblobblamehistory |