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authorLiang Li <liang.z.li@intel.com>2015-12-08 09:14:07 +0800
committerLiang Li <liang.z.li@intel.com>2015-12-08 09:16:17 +0800
commitb52baab237a0b45cb18b26f529e6490b42574209 (patch)
treee8bd69d1ccf45f46381617d27cfdd1966abde0b1 /kernel/fs/notify
parentcc62f651747d5844cc12d33fb3620a7d05bae7dc (diff)
kvmclock: add a new function to update env->tsc.WW-2015-52
(Back port from upstream, commit id: 0fd7e098db30e302d27920487f0afec) The commit 317b0a6d8 fixed an issue which caused by the outdated env-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. Change-Id: I7dc8371aa17b005d073249c3732d9a7424f20a25 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>
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