Re: [Xen-devel] [PATCH] x86/mem_sharing: Relax sanity check for memops

[Tamas K Lengyel <tklengyel@xxxxxxxxxxxxx>]

On Fri, May 29, 2015 at 11:54 AM, Jan Beulich <JBeulich@xxxxxxxx> wrote:

>>> On 29.05.15 at 11:37, <tklengyel@xxxxxxxxxxxxx> wrote:
> The sharing vm_event ring being enabled is not necessary for mem_sharing
> memops.

If indeed so, why would the same not apply to mem_paging memops?

Jan

The ring during mem_sharing is only used to signal an out-of-memory error condition. If no listener is present for this error condition, Xen will automatically kill the domain that was requesting more memory when none is available during unsharing. For paging, the listener is an absolute requirement as without it paging won't work at all. That's not the case for sharing.

Tamas

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