[Bug 106136] per-process/context memory usage accounting for i915

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106136

--- Comment #6 from Abdiel Janulgue <abdiel.janulgue at linux.intel.com> ---
(In reply to Eero Tamminen from comment #5)

> What of this do you think could be implemented on user-space???
> 

Parsing these sysfs files (which contain gem object allocation and free space
in the gtt):

/sys/kernel/debug/dri/0/i915_gem_gtt
/sys/kernel/debug/dri/0/i915_gem_objects

Could be enough for a userspace client to basically "guesstimate" and manage
how much GPU memory it requests for itself?

Note that from a GPU context POV, it is allowed access to entire 2 tebibytes of
virtual address space. I guess by design kernel won't get in the way and give
it as much as it wants until physical backing pages are no more.

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