On Fri, Aug 02, 2019 at 04:23:15PM +0100, Ken Moffat via blfs-dev wrote:
> On Fri, Aug 02, 2019 at 11:05:02AM +0200, Pierre Labastie via blfs-dev wrote:
> >
> > From my investigations, no... And the whole mountcgroupfs bootscript can be
> > omitted, because elogind takes care of mounting those. OTOH, my
> > investigations
> > are limited to using startx with the default xinit clients...
> >
> > I mentioned this error (with less details) in the "xorg failure" thread. If
> > no
> > CONFIG_CGROUP_XXX is selected, the command for mounting the v1 cgroup fs
> > returns an error, and the command for creating the "unified" dir fails too,
> > because the fs is not mounted. Actually, from man cgroups(7), it is said
> > that:
> > "Note that on many systems, the v1 controllers are automatically mounted
> > under /sys/fs/cgroup; in particular, systemd(1) automatically creates
> > such mount points."
> > Now, the question is whether elogind does those mounts too. But one thing is
> > sure: without the mountcgroupfs script, whether or not some
> > CONFIG_CGROUP_XXX
> > is defined, Xorg runs.
> >
> > Pierre
>
> Hmm, I thought it was all getting clearer, and that when I could
> find time to rebuild the kernel a few times I would find out how
> many of those are necessary. But running a DM is not something I've
> done for ages (although I recall that sddm shutdowns were always
> messy because the messages were on a different tty).
>
> I guess I might as well check which options are necessary for the
> mountcgroupfs script.
>
In fact, I needed fewer tests than I'd expected:
I checked CONFIG_INOTIFY_USER, it is indeed required by
mountcgroupfs.
I looked for CONFIG_FHANDLE, the help says it is in General Setup,
which is sort of true, but it's under Configure standard kernel
features (expert users) so I didn't try doing without it.
For the CGROUP options, I began with Memory Controller
CONFIG_MEMCFG=y and disabled the RDMA and Device controllers. That
was sufficient.
ĸen
--
One pill makes you larger, And one pill makes you small.
And the ones that mother gives you, Don't do anything at all.
Go ask Alice, When she's ten feet tall.
-- Jefferson Airplane, White Rabbit
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