Re: [PATCH 13/14] migration/multifd: Move header prepare/fill into send_prepare()

[Fabiano Rosas <farosas@suse.de>]

peterx@redhat.com writes:

> From: Peter Xu <peterx@redhat.com>
>
> This patch redefines the interfacing of ->send_prepare().  It further
> simplifies multifd_send_thread() especially on zero copy.
>
> Now with the new interface, we require the hook to do all the work for
> preparing the IOVs to send.  After it's completed, the IOVs should be ready
> to be dumped into the specific multifd QIOChannel later.
>
> So now the API looks like:
>
>   p->pages ----------->  send_prepare() -------------> IOVs
>
> This also prepares for the case where the input can be extended to even not
> any p->pages.  But that's for later.
>
> This patch will achieve similar goal of what Fabiano used to propose here:
>
> https://lore.kernel.org/r/20240126221943.26628-1-farosas@suse.de
>
> However the send() interface may not be necessary.  I'm boldly attaching a

So should I drop send() for fixed-ram as well? Or do you still want a
separate layer just for send()?

> "Co-developed-by" for Fabiano.
>
> Co-developed-by: Fabiano Rosas <farosas@suse.de>
> Signed-off-by: Peter Xu <peterx@redhat.com>

Reviewed-by: Fabiano Rosas <farosas@suse.de>