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References: <33183CC9F5247A488A2544077AF19020DA2B906D@DGGEMA505-MBX.china.huawei.com>
From: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <0d13548e-717d-b90b-7666-58ada1d3c549@redhat.com>
Date: Fri, 26 May 2017 13:06:35 +0200
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Subject: Re: [Qemu-devel] [RFC] Is it useful to create a seperate address
 space for cpu-memory on x86 platform?
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To: "Gonglei (Arei)" <arei.gonglei@huawei.com>, "peter.crosthwaite@xilinx.com" <peter.crosthwaite@xilinx.com>, "peter.maydell@linaro.org" <peter.maydell@linaro.org>, "edgar.iglesias@xilinx.com" <edgar.iglesias@xilinx.com>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, "Huangweidong (C)" <weidong.huang@huawei.com>



On 26/05/2017 11:59, Gonglei (Arei) wrote:
> The result before this commit:
> 
> linux-arei:/mnt/sdb/gonglei/opensource/qemu # ps aux|grep qemu
> root     12658 17.2  0.0 375996 21412 pts/1    Sl+  12:53   0:00 ./x86_64-softmmu/qemu-system-x86_64 -machine pc-i440fx-2.5,accel=kvm,usb=off -nodefaults
> 
> after the commit:
>  
> linux-arei:/mnt/sdb/gonglei/opensource/qemu # ps aux|grep qemu
> root     23201 17.2  0.0 384196 25736 pts/1    Sl+  12:54   0:00 ./x86_64-softmmu/qemu-system-x86_64 -machine pc-i440fx-2.5,accel=kvm,usb=off -nodefaults
> 
> I couldn't find any benefits on x86 platform (I'm not familiar with ARM), am I missing something?

Hi,

this was also reported by Anthony Xu.  I am working on reducing the time
and space cost of multiple address spaces by sharing the FlatView and
AddressSpaceDispatch.

Paolo