Re: [PATCH] selftests: mm: fix and speedup "droppable" test

[Dev Jain]

On 11/06/26 4:56 pm, David Hildenbrand (Arm) wrote:
>>> +           /*
>>> +            * Speculative reference can temporarily prevent some
>>> +            * pages from getting dropped. So sleep and retry.
>>> +            *
>>> +            * If a page is not droppable for 10s, something
>>> +            * is seriously messed up and we want to fail.
>>> +            */
>>> +           if (dropped)
>>> +                   break;
>>> +           sleep(1);
>>>     }
>>> -   kill(child, SIGTERM);
>>>  
>>> -   ksft_test_result_pass("MAP_DROPPABLE: PASS\n");
>>> -   exit(KSFT_PASS);
>>> +   ksft_test_result(dropped, "madvise(MADV_PAGEOUT) behavior\n");
>>
>> You meant "MAP_DROPPABLE" behaviour? Perhaps that can be folded in.
> 
> No, I did mean "madvise(MADV_PAGEOUT)" behaves as expected with droppable 
> pages.
> 
> Reasoning being that we might want to add some other tests in the future that
> trigger reclaim differently.

Makes sense.


> 
> Thanks!
>