[libvirt] [RFC] support memory reserved feature and optimize mlock guest memory propose

[Paolo Bonzini]

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