[PATCH i-g-t v3 5/5] tests/xe_compute_preempt: consume all ram for wmtp

[Dandamudi, Priyanka]

> -----Original Message-----
> From: Kempczynski, Zbigniew <zbigniew.kempczynski at intel.com>
> Sent: 09 April 2025 12:21 AM
> To: igt-dev at lists.freedesktop.org
> Cc: Kempczynski, Zbigniew <zbigniew.kempczynski at intel.com>; Dugast,
> Francois <francois.dugast at intel.com>; Dandamudi, Priyanka
> <priyanka.dandamudi at intel.com>
> Subject: [PATCH i-g-t v3 5/5] tests/xe_compute_preempt: consume all ram for
> wmtp
> 
> When swap exists on the platform lets try to consume whole ram triggering
> wmtp and eviction.
> 
> Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski at intel.com>
> Cc: Francois Dugast <francois.dugast at intel.com>
> Cc: Priyanka Dandamudi <priyanka.dandamudi at intel.com>
> ---
>  tests/intel/xe_compute_preempt.c | 36
> +++++++++++++++++++++++++++++++-
>  1 file changed, 35 insertions(+), 1 deletion(-)
> 
> diff --git a/tests/intel/xe_compute_preempt.c
> b/tests/intel/xe_compute_preempt.c
> index f07e87d4c4..43ffb8dba3 100644
> --- a/tests/intel/xe_compute_preempt.c
> +++ b/tests/intel/xe_compute_preempt.c
> @@ -29,6 +29,12 @@
>   * Description:
>   *      Exercise multiple walker mid thread preemption scenario
>   *
> + * SUBTEST: compute-preempt-many-all-ram
> + * GPU requirement: LNL, PTL
> + * Description:
> + *      Exercise multiple walker mid thread preemption scenario consuming
> + *      whole ram only when there's swap on the machine
> + *
>   * SUBTEST: compute-threadgroup-preempt
>   * GPU requirement: LNL, PTL
>   * Description:
> @@ -46,11 +52,12 @@ igt_main
>  {
>  	int xe;
>  	struct drm_xe_engine_class_instance *hwe;
> -	uint64_t ram_mb;
> +	uint64_t ram_mb, swap_mb;
> 
>  	igt_fixture {
>  		xe = drm_open_driver(DRIVER_XE);
>  		ram_mb = igt_get_avail_ram_mb();
> +		swap_mb = igt_get_total_swap_mb();
>  	}
> 
>  	igt_subtest_with_dynamic("compute-preempt") { @@ -88,6 +95,33
> @@ igt_main
>  		}
>  	}
> 
> +	igt_subtest_with_dynamic("compute-preempt-many-all-ram") {
> +		igt_require(swap_mb > CONTEXT_MB * 10);
> +
> +		xe_for_each_engine(xe, hwe) {
> +			if (hwe->engine_class !=
> DRM_XE_ENGINE_CLASS_COMPUTE)
> +				continue;
> +
> +			igt_dynamic_f("engine-%s",
> xe_engine_class_string(hwe->engine_class)) {
> +				int child_count;
> +
> +				/*
> +				 * Get whole ram, then divide by
> +				 * CONTEXT_MB * 2 (long and short) job
> +				 */
> +				child_count = ram_mb / CONTEXT_MB / 2;
> +
> +				igt_debug("RAM: %zd, child count: %d\n",
> +					  ram_mb, child_count);
> +
> +				test_compute_preempt(xe, hwe, false);
> +				igt_fork(child, child_count)
> +					test_compute_preempt(xe, hwe,
> false);
> +				igt_waitchildren();
> +			}
> +		}
> +	}
> +LGTM,
Reviewed-by: Priyanka Dandamudi <priyanka.dandamudi at intel.com>
>  	igt_subtest_with_dynamic("compute-threadgroup-preempt") {
>  		xe_for_each_engine(xe, hwe) {
>  			if (hwe->engine_class !=
> DRM_XE_ENGINE_CLASS_COMPUTE)
> --
> 2.34.1