Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT)

[Avi Kivity]

Jamie Lokier wrote:
> Anthony Liguori wrote:
>   
> > Actually, this is precisely what I'd like to do.  The key is to 
> > mmap(MAP_PRIVATE) from the underling file directly into the guest's 
> > memory.  Should be just as applicable to QEMU as KVM (although for KVM 
> > we need mmu-notifiers first).
> >     
>
> With QEMU, that would lead to a huge number of VMAs - different mmap
> address regions.  Linux (or any host for all I know) doesn't handle
> that well.
>
> On Linux you could use remap_file_pages to avoid the VMA problem.
>
>   

Hmm, if remap_file_pages() supports MAP_PRIVATE, that solves all the 
problems neatly.

Andrea, do you know if that combination works?

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error compiling committee.c: too many arguments to function