[Mesa-dev] [PATCH 1/7] mesa: Add usage history bitfield to buffer objects

Marek Olšák maraeo at gmail.com
Wed Oct 1 09:06:33 PDT 2014

On Wed, Oct 1, 2014 at 11:02 AM, Chris Forbes <chrisf at ijw.co.nz> wrote:
> In the drivers, we occasionally want to reallocate the backing
> store for a buffer object; often to avoid waiting for the GPU
> to be finished with the previous contents.
> At the point that happens, we don't have a good way of determining
> where else the buffer object may be bound, and so no good way of
> determining which dirty flags need to be raised -- it's fairly
> expensive to go looking at all the possible binding points.

I don't think so. We do look at all binding points in radeon drivers.
See for example r600_invalidate_buffer. It also only flags the binding
points where the buffer being invalidated is bound and only those
bindings points are updated.

Also I don't see a point in adding things to mtypes.h that are only
used by one driver.

BTW, I can only see patches 1, 5, 6 on mesa-dev. Where's the rest?


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