[Intel-gfx] [PATCH 3/3] drm/i915: Cache LRC state page in the context

[Chris Wilson]

On Fri, Jan 15, 2016 at 03:10:29PM +0000, Tvrtko Ursulin wrote:
> @@ -1118,15 +1126,22 @@ void intel_lr_context_unpin(struct drm_i915_gem_request *rq)
> +	if (--rq->ctx->engine[ring->id].pin_count == 0) {
> +		lrc_state_page = i915_gem_object_get_dirty_page(ctx_obj,
> +								LRC_STATE_PN);

Interesting choice. We called set_page_dirty() when we took the mapping.
Should that page flag be preserved whilst we hold the kmap - I think so,
i.e. the mm cannot flush the page whilst it has an elevated mapcount. So
calling set_page_dirty() again is redundant, right?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre