linux-kernel - Re: CXL Boot to Bash - Section 3: Memory (block) Hotplug

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Message-ID: <Z7d3vVdJ8UWU5oex@gourry-fedora-PF4VCD3F>
Date: Thu, 20 Feb 2025 13:43:09 -0500
From: Gregory Price <gourry@...rry.net>
To: Yang Shi <shy828301@...il.com>
Cc: David Hildenbrand <david@...hat.com>, lsf-pc@...ts.linux-foundation.org,
	linux-mm@...ck.org, linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: CXL Boot to Bash - Section 3: Memory (block) Hotplug

On Thu, Feb 20, 2025 at 09:50:07AM -0800, Yang Shi wrote:
> > > I will double check that this isn't working as expected, and i'll double
> > > check for a build option as well.
> > >
> > > stupid question - it sorta seems like you'd want this as the default
> > > setting for driver-managed hotplug memory blocks, but I suppose for
> > > very small blocks there's problems (as described in the docs).
> >
> > The issue is that it is per-memblock. So you'll never have 1 GiB ranges
> > of consecutive usable memory (e.g., 1 GiB hugetlb page).
> 
> Regardless of ZONE_MOVABLE or ZONE_NORMAL, right?
> 
> Thanks,
> Yang

>From my testing, yes.

~Gregory