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Re: [PATCH 2/2] xen/mm: do not assign pages to a domain until they are scrubbed
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 25 Mar 2026 17:55:28 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 25 Mar 2026 16:55:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25.03.2026 17:26, Roger Pau Monné wrote:
> On Wed, Mar 25, 2026 at 03:56:05PM +0100, Jan Beulich wrote:
>> On 25.03.2026 11:08, Roger Pau Monne wrote:
>>> --- a/xen/common/memory.c
>>> +++ b/xen/common/memory.c
>>> @@ -388,6 +388,12 @@ static void populate_physmap(struct memop_args *a)
>>> goto out;
>>> }
>>> }
>>> +
>>> + if ( assign_page(page, a->extent_order, d, memflags) )
>>> + {
>>> + free_domheap_pages(page, a->extent_order);
>>
>> The pages don't have an owner set yet, so that function will go straight
>> to free_heap_pages(), needlessly passing "true" as last argument. Correct,
>> but (for large pages, which the stashing is about) highly inefficient.
>
> My bad, I was sure I was using the same freeing function as
> alloc_domheap_pages() on failure to assign, but I clearly wasn't. I
> will switch to using free_heap_pages().
Well, not so much your bad, but likely a result of free_heap_pages()
being static in page_alloc.c.
Jan
|
