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

[Samuel Pitoiset]

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.

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