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Re: [Qemu-devel] [RFC PATCH V7 09/19] Drop global lock during TCG code e


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [RFC PATCH V7 09/19] Drop global lock during TCG code execution
Date: Wed, 12 Aug 2015 11:58:45 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0


On 11/08/2015 23:34, Frederic Konrad wrote:
>>>
>> Also if qemu_cond_broadcast(&qemu_io_proceeded_cond) is being dropped
>> there is no point keeping the guff around in qemu_tcg_wait_io_event.
>>
> Yes good point.
> 
> BTW this leads to high consumption of host CPU eg: 100% per VCPU thread as
> the VCPUs thread are no longer waiting for qemu_io_proceeded_cond.

If the guest CPU is busy waiting, that's expected.  But if the guest CPU
is halted, it should not have 100% host CPU consumption.

Paolo



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