[LTP] [PATCH v1] swapping01.c: Add sleeps in the loop that dirties the memory

[Cyril Hrubis]

Hi!
> https://bugzilla.suse.com/show_bug.cgi?id=1217850#c34

If I'm counting right this is 10ms * 1024 which is 10s, I would be
happier with 1ms sleep instead. Or if we did 10ms sleep once every 10
memsets() instead.

Also since this was proposed by Vlastimil in the bugzilla he should
ideally give his ack here as well (now in CC).

> Signed-off-by: Wei Gao <wegao@suse.com>
> ---
>  testcases/kernel/mem/swapping/swapping01.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/testcases/kernel/mem/swapping/swapping01.c b/testcases/kernel/mem/swapping/swapping01.c
> index a0030a75f..338881c8e 100644
> --- a/testcases/kernel/mem/swapping/swapping01.c
> +++ b/testcases/kernel/mem/swapping/swapping01.c
> @@ -47,6 +47,7 @@
>  #define COE_DELTA       1
>  /* will try to alloc 1.3 * phy_mem */
>  #define COE_SLIGHT_OVER 0.3
> +#define MEM_SIZE 1024 * 1024
>  
>  static void init_meminfo(void);
>  static void do_alloc(int allow_raise);
> @@ -101,6 +102,13 @@ static void init_meminfo(void)
>  				swap_free_init, mem_over_max);
>  }
>  
> +static void memset_blocks(char *ptr, int mem_count, int sleep_time_ms) {
> +	for (int i = 0; i < mem_count / 1024; i++) {
> +		memset(ptr + (i * MEM_SIZE), 1, MEM_SIZE);
> +		usleep(sleep_time_ms * 1000);
> +	}
> +}
> +
>  static void do_alloc(int allow_raise)
>  {
>  	long mem_count;
> @@ -115,7 +123,7 @@ static void do_alloc(int allow_raise)
>  	if (allow_raise == 1)
>  		tst_res(TINFO, "try to allocate: %ld MB", mem_count / 1024);
>  	s = SAFE_MALLOC(mem_count * 1024);
> -	memset(s, 1, mem_count * 1024);
> +	memset_blocks(s, mem_count, 10);
>  
>  	if ((allow_raise == 1) && (raise(SIGSTOP) == -1)) {
>  		tst_res(TINFO, "memory allocated: %ld MB", mem_count / 1024);
> -- 
> 2.35.3
> 
> 
> -- 
> Mailing list info: https://lists.linux.it/listinfo/ltp

-- 
Cyril Hrubis
chrubis@suse.cz