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Re: [Qemu-devel] about the patch kvmclock Ensure proper env->tsc value f


From: Marcelo Tosatti
Subject: Re: [Qemu-devel] about the patch kvmclock Ensure proper env->tsc value for kvmclock_current_nsec calculation
Date: Thu, 13 Aug 2015 19:16:50 -0300
User-agent: Mutt/1.5.21 (2010-09-15)

On Thu, Aug 13, 2015 at 01:25:29AM +0000, Li, Liang Z wrote:
> Hi Paolo & Marcelo,
> 
>     Could please point out what issue the patch 317b0a6d8ba44e try to fix?  I 
> found in live migration the cpu_synchronize_all_states will be called twice, 
> and it will take more than 1 ms sometimes. I try to do some optimization but 
> lack the knowledge about the background. 

What the code in 317b0a6d8ba44e requires is to retrieve the TSC value
from the kernel.

Perhaps you can trace kvm_arch_get_regs and look why its taking that
amount of time and what can be done to improve it.




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