Re: [PATCH 06/10] drm/i915: Add support for stealing purgable stolen pages

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

On 22/12/15 06:20, ankitprasad.r.sharma@intel.com wrote:
> From: Chris Wilson <chris at chris-wilson.co.uk>
>
> If we run out of stolen memory when trying to allocate an object, see if
> we can reap enough purgeable objects to free up enough contiguous free
> space for the allocation. This is in principle very much like evicting
> objects to free up enough contiguous space in the vma when binding
> a new object - and you will be forgiven for thinking that the code looks
> very similar.
>
> At the moment, we do not allow userspace to allocate objects in stolen,
> so there is neither the memory pressure to trigger stolen eviction nor
> any purgeable objects inside the stolen arena. However, this will change
> in the near future, and so better management and defragmentation of
> stolen memory will become a real issue.
>
> v2: Remember to remove the drm_mm_node.
>
> v3: Rebased to the latest drm-intel-nightly (Ankit)
>
> v4: corrected if-else braces format (Tvrtko/kerneldoc)
>
> v5: Rebased to the latest drm-intel-nightly (Ankit)
> Added a seperate list to maintain purgable objects from stolen memory
> region (Chris/Daniel)
>
> v6: Compiler optimization (merging 2 single loops into one for() loop),
> corrected code for object eviction, retire_requests before starting
> object eviction (Chris)
>
> v7: Added kernel doc for i915_gem_object_create_stolen()
>
> v8: Check for struct_mutex lock before creating object from stolen
> region (Tvrtko)
>
> v9: Renamed variables to make usage clear, added comment, removed onetime
> used macro (Tvrtko)
>
> v10: Avoid masking of error when stolen_alloc fails (Tvrtko)
>
> v11: Renamed stolen_link to tmp_link, as it may be used for other
> purposes too (Chris)
> Used ERR_CAST to cast error pointers while returning
>
> v12: Added lockdep_assert before starting stolen-backed object
> eviction (Chris)

On the basis that v11 and v12 are simple enough compared to my r-b from v10:

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Regards,

Tvrtko
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