Re: [PATCH part5 0/7] Arrange hotpluggable memory as ZONE_MOVABLE.

[KOSAKI Motohiro]

(8/14/13 3:55 PM), Tejun Heo wrote:
> Hello,
>
> On Wed, Aug 14, 2013 at 03:40:31PM -0400, KOSAKI Motohiro wrote:
> > I don't agree it. Please look at other kernel options. A lot of these don't
> > follow you. These behave as direction, not advise.
> >
> > I mean the fallback should be implemented at turning on default the feature.
>
> Yeah, some options are "please try this" and others "do this or fail".
> There's no frigging fundamental rule there.

In this case, we have zero worth for fallback, right?


> > I don't read whole discussion and I don't quite understand why no kernel
> > place controlling is relevant. Every unpluggable node is suitable for
> > kernel. If you mean current kernel placement logic don't care plugging,
> > that's a bug.
> >
> > If we aim to hot remove, we have to have either kernel relocation or
> > hotplug awre kernel placement at boot time.
>
> What if all nodes are hot pluggable?  Are we moving the kernel
> dynamically then?

Intel folks already told, we have no such system in practice.


> > > Failing to boot is *way* worse reporting mechanism than almost
> > > everything else.  If the sysadmin is willing to risk machines failing
> > > to come up, she would definitely be willing to check whether which
> > > memory areas are actually hotpluggable too, right?
> >
> > No. see above. Your opinion is not pragmatic useful.
>
> No, what you're saying doesn't make any sense.  There are multiple
> ways to report when something doesn't work.  Failing to boot is *one*
> of them and not a very good one.  Here, for practical reasons, the end
> result may differ depending on the specifics of the configuration, so
> more detailed reporting is necessary anyway, so why do you insist on
> failing the boot?  In what world is it a good thing for the machine to
> fail boot after bios or kernel update?

Because boot failure have no chance to overlook and better way for practice.



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