Re: [PATCH i-g-t 01/19] i915/gem_ppgtt: Estimate resource usage and bail if it means swapping!

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

Chris Wilson <chris@chris-wilson.co.uk> writes:

> fi-kbl-guc's swap ran dry while running blt-vs-render-ctxN, which is
> midly concerning but conceivable as we never checked there was enough
> memory to run the test to begin with.
>
> Each child needs to keep its own surface and possible a pair of logical
> contexts (one for rcs and one for bcs) so check that there is enough
> memory to allow all children to co-exist. During execution, we require
> another surface and batch, but these are temporary and so should fit
> fine with a small amount of thrashing on the boundary.
>
> References: https://bugs.freedesktop.org/show_bug.cgi?id=109801
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> ---
>  tests/i915/gem_ppgtt.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/tests/i915/gem_ppgtt.c b/tests/i915/gem_ppgtt.c
> index 11ca31e74..9409bef14 100644
> --- a/tests/i915/gem_ppgtt.c
> +++ b/tests/i915/gem_ppgtt.c
> @@ -91,8 +91,14 @@ static void fork_rcs_copy(int timeout, uint32_t final,
>  #define CREATE_CONTEXT 0x1
>  {
>  	igt_render_copyfunc_t render_copy;
> +	uint64_t mem_per_child;
>  	int devid;
>  
> +	mem_per_child = SIZE;
> +	if (flags & CREATE_CONTEXT)
> +		mem_per_child += 2 * 128 * 1024; /* rough context sizes */

Someday libify this so that we give num context and size per each?
Just that the modern gens eat more so we could tweak per gen instead
of going with the max estimate. Regardless,

Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>


> +	intel_require_memory(mem_per_child, count, CHECK_RAM);
> +
>  	for (int child = 0; child < count; child++) {
>  		int fd = drm_open_driver(DRIVER_INTEL);
>  		drm_intel_bufmgr *bufmgr;
> -- 
> 2.20.1
>
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