Re: [PATCH] mm/madvise: reclaim isolated folios if PTE restart fails

[David Hildenbrand (Arm)]

On 9/16/26 16:58, Gregory Price wrote:
> On Wed, Sep 16, 2026 at 04:48:04PM +0200, David Hildenbrand (Arm) wrote:
>> On 9/16/26 16:42, Gregory Price wrote:
>>>
>>> Yes, in fact I used that as a start for exploring how I might make other
>>> components testable the same way.
>>>
>>> "Stubs... stubs everywhere"
>>>
>>> There's basically 4 testing mechanisms i explored:
>>>
>>> 1) selftest
>>> 2) Usermode Linux (UML)
>>> 3) Userland stuff like VMA
>>> 4) Linux Test Project (for syscall and ABI testing)
>>>
>>> selftests are really limited and actually create a maintenance burden,
>>> they're not real unit tests and are highly dependent on the actual
>>> machine configuration which is super annoying.
>>>
>>> But, lets take the page allocator as an example.
>>>
>>> The only piece of the page allocator that "should" (cough, simplifying
>>> here a bit) be machine specific is zone and node configurations... but
>>> I'm not convinced that this should require a full VM to unit-test.
>>
>> I told Brendan exactly that (try stubbing it) and he tried ... and had to give
>> up at some point because it just wasn't feasible. ;)
>>
> 
> LLM go brrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr

No schlop like that please, I don't want to hate my life

-- 
Cheers,

David