Re: [PATCH 0/2] RFC: add -mem-shared option

[Marc-André Lureau]

Hi

On Fri, Nov 29, 2019 at 11:03 AM Gerd Hoffmann <address@hidden> wrote:
>
> On Thu, Nov 28, 2019 at 06:15:16PM +0400, Marc-André Lureau wrote:
> > Hi,
> >
> > Setting up shared memory for vhost-user is a bit complicated from
> > command line, as it requires NUMA setup such as: m 4G -object
> > memory-backend-file,id=mem,size=4G,mem-path=/dev/shm,share=on -numa
> > node,memdev=mem.
> >
> > Instead, I suggest to add a -mem-shared option for non-numa setups,
> > that will make the -mem-path or anonymouse memory shareable.
>
> Is it an option to just use memfd by default (if available)?

Yes, with a fallback path currently using a temporary file under /tmp
(we may want to use shm_open() instead, or a different location such
as XDG_RUNTIME_DIR? - and use O_TMPFILE)