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Re: [Qemu-devel] [RFC] support memory reserved feature and optimize mloc
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [RFC] support memory reserved feature and optimize mlock guest memory propose |
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Date: |
Wed, 05 Mar 2014 09:56:35 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 |
Il 05/03/2014 09:01, Zhanghailiang ha scritto:
> Hi all：
>
> Currently, we use cgroup(memory) to support memory QoS on KVM platform,
> and use "mlock" on qemu to support "memory reserved".
>
> The "mlock" seems to be not appropriate.
>
> Now qemu "mlock" memory in the main thread, which would lock iothread
> (qemu_mutex_lock_iothread), if the memory size is large, that will
> consume lots of time.
>
> It means whenever we want to set a new 'mlock', the VM would be blocked
> for a while.
I'm not sure I understand how the mlock-ed memory is used. Are you
using a custom malloc, for example with g_mem_set_vtable?
Paolo