linux-kernel - Re: [PATCH v2 7/8] selftests/mm: Optionally pass duration to transhuge-stress

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Date:   Mon, 17 Jul 2023 19:24:35 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Ryan Roberts <ryan.roberts@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>,
        Jérôme Glisse <jglisse@...hat.com>,
        Mark Brown <broonie@...nel.org>,
        John Hubbard <jhubbard@...dia.com>,
        Florent Revest <revest@...omium.org>,
        Peter Xu <peterx@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 7/8] selftests/mm: Optionally pass duration to
 transhuge-stress

On 17.07.23 12:31, Ryan Roberts wrote:
> Until now, transhuge-stress runs until its explicitly killed, so when
> invoked by run_kselftest.sh, it would run until the test timeout, then
> it would be killed and the test would be marked as failed.
> 
> Add a new, optional command line parameter that allows the user to
> specify the duration in seconds that the program should run. The program
> exits after this duration with a success (0) exit code. If the argument
> is omitted the old behacvior remains.
> 
> On it's own, this doesn't quite solve our problem because
> run_kselftest.sh does not allow passing parameters to the program under
> test. But we will shortly move this to run_vmtests.sh, which does allow
> parameter passing.
> 
> Signed-off-by: Ryan Roberts <ryan.roberts@....com>
> ---
>   tools/testing/selftests/mm/transhuge-stress.c | 12 ++++++++++--
>   1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/mm/transhuge-stress.c b/tools/testing/selftests/mm/transhuge-stress.c
> index ba9d37ad3a89..c61fb9350b8c 100644
> --- a/tools/testing/selftests/mm/transhuge-stress.c
> +++ b/tools/testing/selftests/mm/transhuge-stress.c
> @@ -25,13 +25,14 @@ int main(int argc, char **argv)
>   {
>   	size_t ram, len;
>   	void *ptr, *p;
> -	struct timespec a, b;
> +	struct timespec start, a, b;
>   	int i = 0;
>   	char *name = NULL;
>   	double s;
>   	uint8_t *map;
>   	size_t map_len;
>   	int pagemap_fd;
> +	int duration = 0;
>   
>   	ram = sysconf(_SC_PHYS_PAGES);
>   	if (ram > SIZE_MAX / psize() / 4)
> @@ -42,9 +43,11 @@ int main(int argc, char **argv)
>   
>   	while (++i < argc) {
>   		if (!strcmp(argv[i], "-h"))
> -			errx(1, "usage: %s [size in MiB]", argv[0]);
> +			errx(1, "usage: %s [-f <filename>] [-d <duration>] [size in MiB]", argv[0]);
>   		else if (!strcmp(argv[i], "-f"))
>   			name = argv[++i];
> +		else if (!strcmp(argv[i], "-d"))
> +			duration = atoi(argv[++i]);
>   		else
>   			len = atoll(argv[i]) << 20;
>   	}
> @@ -78,6 +81,8 @@ int main(int argc, char **argv)
>   	if (!map)
>   		errx(2, "map malloc");
>   
> +	clock_gettime(CLOCK_MONOTONIC, &start);
> +
>   	while (1) {
>   		int nr_succeed = 0, nr_failed = 0, nr_pages = 0;
>   
> @@ -118,5 +123,8 @@ int main(int argc, char **argv)
>   		      "%4d succeed, %4d failed, %4d different pages",
>   		      s, s * 1000 / (len >> HPAGE_SHIFT), len / s / (1 << 20),
>   		      nr_succeed, nr_failed, nr_pages);
> +
> +		if (duration > 0 && b.tv_sec - start.tv_sec >= duration)
> +			return 0;
>   	}
>   }

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Cheers,

David / dhildenb