Re: [PATCH v7 4/6] numa: Introduce and use ram_block_notify_remap()

[Peter Xu <peterx@redhat.com>]

On Sat, Feb 01, 2025 at 09:57:24AM +0000, “William Roche wrote:
> From: David Hildenbrand <david@redhat.com>
> 
> Notify registered listeners about the remap at the end of
> qemu_ram_remap() so e.g., a memory backend can re-apply its
> settings correctly.
> 
> Signed-off-by: David Hildenbrand <david@redhat.com>
> Signed-off-by: William Roche <william.roche@oracle.com>

IIUC logically speaking we don't need a global remap notifier - here a
per-ramblock notifier looks more reasonable, like RAMBlock.resized().
It'll change the notify path from O(N**2) to O(N).  After all, backend1's
notifier won't care other ramblock's remap() events but only itself's.

It's not a huge deal as I expect we don't have a huge amount of ramblocks,
but looks like this series will miss the recent pull anyway..  so let me
comment as so on this one for consideration when respin.

We could also merge partial of the series to fix hugetlb poisoning first,
as this one looks like can be separately done too.

Thanks,

-- 
Peter Xu