Re: [Qemu-devel] [PATCH v18 13/14] memory backend: fill memory backend ram fields

[Paolo Bonzini]

Il 26/02/2014 06:57, Hu Tao ha scritto:
> If lines about memory polices are moved up to hostmem.c, the only thing
> left in ram_backend_memory_init() is calling memory_region_init_ram() to
> allocate memory. Then it comes a problem that when to apply memory
> polices? Choices:
>
> 1. apply memory polices in hostmem.c since this is the place user sets
>    memory polices. But user_creatable_complete() seems not to support
>    this.( but fix me)
>
> 2. cast to HostMemoryBackend in ram_backend_memory_init() (or in other
>    memory backends) and add lines to apply memory polices.
>
> 3. provide an interface in HostMemoryBackendClass to do the thing and
>    call it in subclasses. (this is basically the same as 2 except that
>    we can reuse code)

I like (3).  I understand it's something like

void memory_backend_apply_mempolicy(HostMemoryBackend *be,
                                    void *addr, size_t len, Error **err)

?

Paolo