[Mesa-dev] [PATCH] gallium/radeon: add a new HUD query for the number of mapped buffers

[Nicolai Hähnle]

On 24.01.2017 11:25, Samuel Pitoiset wrote:
> On 01/24/2017 07:39 AM, Michel Dänzer wrote:
>> On 24/01/17 05:44 AM, Samuel Pitoiset wrote:
>>> Useful when debugging applications which map too much VRAM.
>>
>> Is the number of mapped buffers really useful, as opposed to the total
>> size of buffer mappings? Even if it was the latter though, it doesn't
>> show which mappings are for BOs in VRAM vs GTT, does it? Also, even the
>> total size of mappings of BOs currently in VRAM doesn't directly reflect
>> the pressure on the CPU visible part of VRAM — only the BOs which are
>> actively being accessed by the CPU contribute to that.
>
> It's actually useful to know the number of mapped buffers, but maybe it
> would be better to have two separate counters for GTT and VRAM. Although
> the number of mapped buffers in VRAM is most of the time very high
> compared to GTT AFAIK.
>
> I will submit in a follow-up patch, something which reduces the number
> of mapped buffers in VRAM (when a BO has been mapped only once). And
> this new counter helped me.

Michel's point probably means that reducing the number/size of mapped 
VRAM buffers isn't actually that important though.

Nicolai

>
>>
>>
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