linux-kernel - Re: [PATCH] selftests/vm: Don't mlockall MCL

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Date:	Mon, 27 Jun 2016 11:54:55 -0600
From:	Shuah Khan <shuahkh@....samsung.com>
To:	Yannick Brosseau <scientist@...com>,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
	emunson@...mai.com, treding@...dia.com
Cc:	kernel-team@...com
Subject: Re: [PATCH] selftests/vm: Don't mlockall MCL_CURRENT in
 on-fault-limit test

On 06/20/2016 03:27 PM, Yannick Brosseau wrote:
> The default MEMLOCK limit is not big enough to accomodate all the
> current pages of the test program process, so the test fails
> at this step.
> By removing the MCL_CURRENT flag, we allow the mlockall
> call to succeed. The mmap is twice the size of the current limit,
> so it will still fail as expected.
> 
> Signed-off-by: Yannick Brosseau <scientist@...com>

Thanks for the patch. I will get this into 4.8-rc1.

-- Shuah

> ---
>  tools/testing/selftests/vm/on-fault-limit.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/vm/on-fault-limit.c b/tools/testing/selftests/vm/on-fault-limit.c
> index 245accc..0ae458f 100644
> --- a/tools/testing/selftests/vm/on-fault-limit.c
> +++ b/tools/testing/selftests/vm/on-fault-limit.c
> @@ -20,7 +20,7 @@ static int test_limit(void)
>  		return ret;
>  	}
>  
> -	if (mlockall(MCL_CURRENT | MCL_ONFAULT | MCL_FUTURE)) {
> +	if (mlockall(MCL_ONFAULT | MCL_FUTURE)) {
>  		perror("mlockall");
>  		return ret;
>  	}
>