Re: [PATCH] DAX: warn when kmem regions are truncated for memory block alignment.

[Gregory Price]

On Tue, Apr 01, 2025 at 11:33:59AM +0200, David Hildenbrand wrote:
> On 31.03.25 20:27, Gregory Price wrote:
> > We discussed [1] how this auto-sizing can cause 1GB huge page
> > allocation failures (assuming you online as ZONE_NORMAL). That means
> > ACPI-informed sizing by default would potentially be harmful to existing
> > systems and adding yet-another-boot-option just seems nasty.
> > 
> > I've since dropped acpi-informed block size patch[2].  If there are opinions
> > otherwise, I can continue pushing it.
> 
> Oh, I thought we would be going forward with that. What's the reason we
> would not want to do that?
> 

It seemed like having it reduce block size by default would make 1GB huge
pages less reliable to allocate. If you think this isn't a large concern,
I can update and push again.  I suppose I could make it a build option.

Any opinions here are welcome.

~Gregory