Re: [RFC PATCH] Exporting Guest RAM information for NUMA binding

Peter Zijlstra
2011-11-21T17:03:00Z

On Mon, 2011-11-21 at 21:30 +0530, Bharata B Rao wrote:
>
> In the original post of this mail thread, I proposed a way to export
> guest RAM ranges (Guest Physical Address-GPA) and their corresponding host
> host virtual mappings (Host Virtual Address-HVA) from QEMU (via QEMU monitor).
> The idea was to use this GPA to HVA mappings from tools like libvirt to bind
> specific parts of the guest RAM to different host nodes. This needed an
> extension to existing mbind() to allow binding memory of a process(QEMU) from a
> different process(libvirt). This was needed since we wanted to do all this from
> libvirt.
>
> Hence I was coming from that background when I asked for extending
> ms_mbind() to take a tid parameter. If QEMU community thinks that NUMA
> binding should all be done from outside of QEMU, it is needed, otherwise
> what you have should be sufficient.

That's just retarded, and no you won't get such extentions. Poking at
another process's virtual address space is just daft. Esp. if there's no
actual reason for it.

Furthermore, it would make libvirt a required part of qemu, and since I
don't think I've ever use libvirt that's another reason to object, I
don't need that stinking mess.