* Masayoshi Mizuma <msys.miz...@gmail.com> wrote:
> Ping...
> I would appreciate if someone could review it because this patch
> fixes the real memory hotplug issue...
Yeah, so I generally try to resist random new boot options that
work around real bugs, so please convince me that this patch
is the best option:
>
> On Tue, Sep 04, 2018 at 11:11:40AM -0400, Masayoshi Mizuma wrote:
> > From: Masayoshi Mizuma <m.miz...@jp.fujitsu.com>
> >
> > If each node of physical memory layout has huge space for hotplug,
> > the padding used for the physical memory mapping section is not enough.
> > For exapmle of the layout:
> > SRAT: Node 6 PXM 4 [mem 0x100000000000-0x13ffffffffff] hotplug
> > SRAT: Node 7 PXM 5 [mem 0x140000000000-0x17ffffffffff] hotplug
> > SRAT: Node 2 PXM 6 [mem 0x180000000000-0x1bffffffffff] hotplug
> > SRAT: Node 3 PXM 7 [mem 0x1c0000000000-0x1fffffffffff] hotplug
> >
> > We can increase the padding by CONFIG_RANDOMIZE_MEMORY_PHYSICAL_PADDING,
> > however, the needed padding size depends on the system environment.
> > The kernel option is better than changing the config.
> >
> > Change log from v2:
> > - Simplify the description. As Baoquan said, this is simillar SGI UV issue,
> > but a little different. Remove SGI UV description.
Could you please explain it a bit better where the higher padding requirement
comes from?
'system environment' is very opaque.
Thanks,
Ingo
