linux-kernel - Re: [PATCH] selftests: hugetlb_dio: Fixup Check for initial conditions to skip in the start

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Message-ID: <433d2870-987d-4d63-a07c-287580e1d6c7@linux.ibm.com>
Date: Sun, 10 Nov 2024 12:22:12 +0530
From: Donet Tom <donettom@...ux.ibm.com>
To: akpm@...ux-foundation.org
Cc: Usama.Anjum@...labora.com, kernel@...labora.com,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-mm@...ck.org, shuah@...nel.org
Subject: Re: [PATCH] selftests: hugetlb_dio: Fixup Check for initial
 conditions to skip in the start


On 11/10/24 12:19, Donet Tom wrote:
> This test verifies that a hugepage, used as a user buffer for
> DIO operations, is correctly freed upon unmapping. To test this,
> we read the count of free hugepages before and after the mmap,
> DIO, and munmap operations, then check if the free hugepage count
> is the same.
>
> Reading free hugepages before the test was removed by commit
> 0268d4579901 ('selftests: hugetlb_dio: check for initial conditions
> to skip at the start'), causing the test to always fail.
>
> This patch adds back reading the free hugepages before starting
> the test. With this patch, the tests are now passing.
>
> Test Results without this patch
>
> ./tools/testing/selftests/mm/hugetlb_dio
> TAP version 13
> 1..4
>   # No. Free pages before allocation : 0
>   # No. Free pages after munmap : 100
> not ok 1 : Huge pages not freed!
>   # No. Free pages before allocation : 0
>   # No. Free pages after munmap : 100
> not ok 2 : Huge pages not freed!
>   # No. Free pages before allocation : 0
>   # No. Free pages after munmap : 100
> not ok 3 : Huge pages not freed!
>   # No. Free pages before allocation : 0
>   # No. Free pages after munmap : 100
> not ok 4 : Huge pages not freed!
>   # Totals: pass:0 fail:4 xfail:0 xpass:0 skip:0 error:0
>
> Test results with this patch.
>
> ./tools/testing/selftests/mm/hugetlb_dio
> TAP version 13
> 1..4
>   # No. Free pages before allocation : 0
>   # No. Free pages after munmap : 100
> not ok 1 : Huge pages not freed!
>   # No. Free pages before allocation : 0
>   # No. Free pages after munmap : 100
> not ok 2 : Huge pages not freed!
>   # No. Free pages before allocation : 0
>   # No. Free pages after munmap : 100
> not ok 3 : Huge pages not freed!
>   # No. Free pages before allocation : 0
>   # No. Free pages after munmap : 100
> not ok 4 : Huge pages not freed!
>   # Totals: pass:0 fail:4 xfail:0 xpass:0 skip:0 error:0
>
> Fixes: 0268d4579901 ("selftests: hugetlb_dio: check for initial conditions to skip in the start")
> Signed-off-by: Donet Tom <donettom@...ux.ibm.com>
> ---
>   tools/testing/selftests/mm/hugetlb_dio.c | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/tools/testing/selftests/mm/hugetlb_dio.c b/tools/testing/selftests/mm/hugetlb_dio.c
> index 60001c142ce9..432d5af15e66 100644
> --- a/tools/testing/selftests/mm/hugetlb_dio.c
> +++ b/tools/testing/selftests/mm/hugetlb_dio.c
> @@ -44,6 +44,13 @@ void run_dio_using_hugetlb(unsigned int start_off, unsigned int end_off)
>   	if (fd < 0)
>   		ksft_exit_fail_perror("Error opening file\n");
>   
> +	/* Get the free huge pages before allocation */
> +	free_hpage_b = get_free_hugepages();
> +	if (free_hpage_b == 0) {
> +		close(fd);
> +		ksft_exit_skip("No free hugepage, exiting!\n");
> +	}
> +
>   	/* Allocate a hugetlb page */
>   	orig_buffer = mmap(NULL, h_pagesize, mmap_prot, mmap_flags, -1, 0);
>   	if (orig_buffer == MAP_FAILED) {
>
>
Hi Andrew
Would you prefer I send this fixup patch as a new series, or is it okay as is?

Thanks
Donet