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From: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <3570bfd4-e963-df19-9df6-5629e5e203af@redhat.com>
Date: Mon, 22 May 2017 17:30:49 +0200
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Subject: Re: [Qemu-devel] [RFC] memory consumption of Qemu is twice as much
 as the previous version in KVM
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To: "Gonglei (Arei)" <arei.gonglei@huawei.com>, "Daniel P. Berrange" <berrange@redhat.com>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>



On 22/05/2017 17:11, Gonglei (Arei) wrote:
>> These are kernel allocations done by KVM when it gets the
>> KVM_SET_USER_MEMORY_REGION ioctl; of course the two memory maps
>> point to
>> the same userspace mmap-ed area.
>
> Oh? What's the mmapd-ed area you pointed?

I mean the MAP_ANON pages that back the guest memory.

> If the KVM allocate memory by vmalloc(), then it will occupy physical
> memory (non physically contiguous memory) IMO.
> 
> We can get the information from /proc/meminfo:
> 
> # cat /proc/meminfo |grep Vmalloc     
> VmallocTotal:   34359738367 kB
> VmallocUsed:      532796 kB
> VmallocChunk:   34292018200 kB
> 
> So I think this part of memory is double after that SMM commit. Right?

Yes.

Paolo