Re: [Intel-gfx] [PATCH 10/17] drm/i915/gtt: Lazily allocate page directories for gen7

Wed, 06 Jun 2018 15:26:17 -0700 

On 6 June 2018 at 07:27, Chris Wilson <[email protected]> wrote:
> As we were only supporting aliasing_ppgtt on gen7 for some time, we
> saved a few checks by preallocating the page directories on creation.
> However, since we need 2MiB of page directories for each ppgtt, to
> support arbitrary numbers of user contexts, we need to be more prudent
> in our allocations, and defer the page allocation until it is used. We
> don't recover unused pages yet as we found that doing so on the fly
> (i.e. altering TLB entries) would confuse the GPU.
>
> Signed-off-by: Chris Wilson <[email protected]>
> Cc: Joonas Lahtinen <[email protected]>
> Cc: Mika Kuoppala <[email protected]>
> Cc: Matthew Auld <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
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