[Bug 200387] amdgpu uses unusually high memory

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https://bugzilla.kernel.org/show_bug.cgi?id=200387

--- Comment #25 from phoenix (felix at feldspaten.org) ---
Created attachment 277153
  --> https://bugzilla.kernel.org/attachment.cgi?id=277153&action=edit
Memor usage measurements for different programs using Kernel 4.9.111 and
4.15.0-24

Ok, I've tested the issue using Kernel 4.15.0-24-generic (Shipped with Ubuntu
Mate) using the amdgpu driver and a 4.9.111 Kernel using the amdgpu-pro driver
(17.40).

Sadly building the amdgpu-pro driver for Kernel linux-4.14.53 failed, so I
couldn't test that one.

The issue occurs also in the 4.15.0-24-generic Kernel, while the 4.9.111 Kernel
has significantly lower main memory requirements using Cities Skylines.

Also I found out, that neither the output of mstat nor proc shows significant
differences in the processes between the Kernel versions. So as of now the only
accessible metric for measuring the memory usage is to look at the output for
'free'.


In addition I could observe the same memory issue (but without a system freeze)
in Civilization Beyond earth using the above mentioned Kernel versions. That
program is more suitable than a rather low-resource program like Stardew
Valley.

Find attached the text file MemUsage.txt with my current measurements.


Attaching Valgrind to a Steam Game is kind of non-trivial, do you still think
that this gives us some meaningful insights? I can work that out, but fear that
this soon goes beyond the scopes of my available time, still can give it a
shot.

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