drm/i915: Create a kmem_cache to allocate struct i915_priolist from

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The i915_priolist are allocated within an atomic context on a path where
we wish to minimise latency. If we use a dedicated kmem_cache, we have
the advantage of a local freelist from which to service new requests
that should keep the latency impact of an allocation small. Though
currently we expect the majority of requests to be at default priority
(and so hit the preallocate priolist), once userspace starts using
priorities they are likely to use many fine grained policies improving
the utilisation of a private slab.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170517121007.27224-9-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2017-05-17 13:10:04 +01:00

parent 6c067579e6

commit c5cf9a9147

5 changed files with 20 additions and 5 deletions

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1

drivers/gpu/drm/i915/i915_drv.h

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9

drivers/gpu/drm/i915/i915_gem.c

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2

drivers/gpu/drm/i915/i915_guc_submission.c

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4

drivers/gpu/drm/i915/intel_lrc.c

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9

drivers/gpu/drm/i915/selftests/mock_gem_device.c

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