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Re: [PATCH v3 6/7] xen/page_alloc: Protect claimed memory against other allocations
- To: Bernhard Kaindl <bernhard.kaindl@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 13 Nov 2025 15:18:33 +0100
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- Cc: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 13 Nov 2025 14:18:50 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 07.09.2025 18:15, Bernhard Kaindl wrote:
> --- a/xen/common/page_alloc.c
> +++ b/xen/common/page_alloc.c
> @@ -980,9 +980,19 @@ static struct page_info *get_free_buddy(unsigned int
> zone_lo,
> {
> zone = zone_hi;
> do {
> - /* Check if target node can support the allocation. */
> - if ( !avail[node] || (avail[node][zone] < (1UL << order)) )
> - continue;
> + unsigned long request = 1UL << order;
> + /*
> + * Check if this node is currently suitable for this allocation.
> + * 1. It has sufficient memory in the requested zone and the
> + * 2. request must fit in the unclaimed memory of the node minus
> + * outstanding claims, unless the allocation is made by a
> domain
> + * with sufficient node-claimed memory to cover the
> allocation.
> + */
> + if ( !avail[node] || (avail[node][zone] < request) ||
> + (insufficient_memory(node, request) &&
> + (!d || node != d->claim_node || /* a domain with
> claims */
What if ->claim_node is NUMA_NO_NODE?
Jan
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