[Bug 214425] [drm][amdgpu][TTM] Page pool memory never gets freed

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=214425

--- Comment #2 from Martin Doucha (doucha@swarmtech.cz) ---
(In reply to Rafael Ristovski from comment #1)
> According to amdgpu devs, this is a feature where the allocated pages are
> kept around in case they are needed later on. TTM is able to release the
> memory in case the memory pressure increases.

I understand the logic behind keeping idle buffers allocated for a while. But
it does not make sense to keep them for hours after last use and the release
mechanism on increased memory pressure does not seem to be working.

When I run a large compilation overnight, starting from a fresh reboot and
shutting down all graphics software including the X server, I'll often come
back in the morning to find that 70% of all RAM is allocated in idle TTM
buffers and GCC is stuck swapping for hours. The TTM buffers were likely
allocated by some GPU-accelerated build computation halfway through the night.
But this is harder to reproduce than the games I've mentioned in the initial
bugreport.

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