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

Michel Dänzer michel at daenzer.net
Wed Jan 25 02:51:14 UTC 2017

On 24/01/17 07:18 PM, Nicolai Hähnle wrote:
> On 24.01.2017 07:39, 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.
> Thanks, I didn't know that.
> However, the number of mapped buffers is still useful information
> because we used to run into Linux's limit on the number of simultaneous
> mmap()ings before :)

Makes sense, but then the commit log should be changed to better reflect
what it's useful for.

Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer

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