On 20.02.25 19:43, Gregory Price wrote:
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.
Yes, the only way to get some 1 GiB pages is by using larger memory
blocks (e.g., 2 GiB on x86-64), which comes with a different set of
issues (esp. hotplug granularity).
Of course, only 1x usable 1 GiB page for each 2 GiB block.
There were ideas in how to optimize that (e.g., requiring a new sysfs
interface to expose variable-sized blocks), if anybody is interested,
please reach out.
--
Cheers,
David / dhildenb
