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!
>