Re: [Xen-devel] [PATCH MINI-OS] xenbus: notify the other end when necessary

[Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>]

Wei Liu, le Mon 26 Oct 2015 12:14:43 +0000, a écrit :
> In my patch, mini-os notifies remote whenever it consumes a message,
> which I think it's slightly better because backend can start putting
> things in the ring as mini-os processes them.

That makes more notifications, but that can lead to more pipelining
indeed.  That's what the Linux driver does, so let's do the same.

Also, I'm realizing: aren't we missing a full memory barrier between
the memcpy_from_ring call and xenstore_buf->rsp_cons += ? (in the two
places) We need to make sure to have finished copying from the ring
before writing the new rsp_cons.

Samuel

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