[PATCH] drm/xe/tests: Limit purgeable size for faster execution

[Thomas Hellström]

On Wed, 2024-11-13 at 16:02 +0100, Nirmoy Das wrote:
> xe_bo_shrink_kunit takes a while to run on some machines depending
> on swap storage speed and ram size. Limit purgeable size to 2GB
> so xe_bo_shrink_kunit can execute much faster.

Hmm. This actually limits the swap size to 2GiB, and thus *increases*
the fraction of purgeable bos.

But question is if we end up shrinking only purgeable bos, given that
we, to be safe, overestimate the need for purgeable bos with 20%.

Probably better than skipping the test completely, though.

/Thomas
 

> 
> Cc: Matthew Auld <matthew.auld at intel.com>
> Suggested-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
> Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2998
> Signed-off-by: Nirmoy Das <nirmoy.das at intel.com>
> ---
>  drivers/gpu/drm/xe/tests/xe_bo.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/xe/tests/xe_bo.c
> b/drivers/gpu/drm/xe/tests/xe_bo.c
> index cd811aa2b227..71b71a546abe 100644
> --- a/drivers/gpu/drm/xe/tests/xe_bo.c
> +++ b/drivers/gpu/drm/xe/tests/xe_bo.c
> @@ -467,7 +467,7 @@ static int shrink_test_run_device(struct
> xe_device *xe)
>  	}
>  	to_alloc = ram * 2;
>  
> -	ram_and_swap = ram + get_nr_swap_pages() * PAGE_SIZE;
> +	ram_and_swap = ram + min(get_nr_swap_pages() * PAGE_SIZE,
> SZ_2G);
>  	if (to_alloc > ram_and_swap)
>  		purgeable = to_alloc - ram_and_swap;
>  	purgeable += div64_u64(purgeable, 5);