[Intel-gfx] [intel-gfx][PATCH] intel: add a new interface drm_intel_bo_alloc_direct

[Eric Anholt]

On Thu, 27 May 2010 11:22:02 +0800, "Xiang, Haihao" <haihao.xiang at intel.com> wrote:
> On Thu, 2010-05-27 at 04:52 +0800, Eric Anholt wrote: 
> > On Tue, 25 May 2010 13:06:50 +0800, "Xiang, Haihao" <haihao.xiang at intel.com> wrote:
> > > This interface is the same as drm_intel_bo_alloc except the allocated
> > > size isn't rounded up, so it bypasses the cache bucket.
> > > 
> > > The size of the BO created by drm_intel_bo_alloc for a 1920x800,4:2:0 YUV
> > > planar surface is 4M, it is about 2.2M if using drm_intel_bo_alloc_direct.
> > 
> > You could just init a cache bucket of that size, and get BO caching with
> > no overhead and no new interfaces.
> 
> I ever considered modifying the cache bucket, including a new interface
> to override the default cache bucket. The problem is that the the size
> of the surface BO and related BO may vary from case to case, we don't
> know the right size when initializing cache bucket.

We should probably just make a bunch more buckets.  It's not like video
is the only thing that suffers from overallocation.  Mipmapped textures
will tend to be 1.5 times a power of two in size.
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