Re: [PATCH] KFENCE: Clarify that sample allocations are not following NUMA or memory policies

[Vlastimil Babka]

On 1/24/25 09:37, Marco Elver wrote:
> On Fri, 24 Jan 2025 at 09:13, Vlastimil Babka <vbabka@xxxxxxx> wrote:
>>
>> On 1/23/25 23:44, Christoph Lameter via B4 Relay wrote:
>> > From: Christoph Lameter <cl@xxxxxxxxx>
>> >
>> > KFENCE manages its own pools and redirects regular memory allocations
>> > to those pools in a sporadic way. The usual memory allocator features
>> > like NUMA, memory policies and pfmemalloc are not supported.
>>
>> Can it also violate __GFP_THISNODE constraint? That could be a problem, I
>> recall a problem in the past where it could have been not honoured by the
>> page allocator, leading to corruption of slab lists.
> 
> KFENCE does not sample page allocator allocations. Is kmalloc()
> allowed to take __GFP_THISNODE?

Yeah and SLUB is honouring it.