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

Ilia Mirkin imirkin at alum.mit.edu
Wed Oct 1 21:05:01 PDT 2014

On Wed, Oct 1, 2014 at 12:06 PM, Marek Olšák <maraeo at gmail.com> wrote:
> 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.

Without commenting on the approach, Chris's new test does fail on
nvc0. Perhaps check radeon as well? Could be some sort of driver fail
there, of course, I didn't spend too much time investigating. I
figured we'd need the same fix in mesa/st.

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