Re: [PATCH] mm: Throttle shrinkers harder

[Dave Hansen <dave.hansen@intel.com>]

Poking around with those tracepoints, I don't see the i915 shrinker
getting run, only i915_gem_inactive_count() being called.  It must be
returning 0 because we're never even _getting_ to the tracepoints
themselves after calling i915_gem_inactive_count().

This is on my laptop, and I haven't been able to coax i915 in to
reclaiming a single page in 10 or 15 minutes.  That seems fishy to me.
Surely *SOMETHING* has become reclaimable in that time.

Here's /sys/kernel/debug/dri/0/i915_gem_objects:

> 919 objects, 354914304 bytes
> 874 [333] objects, 291004416 [93614080] bytes in gtt
>   0 [0] active objects, 0 [0] bytes
>   874 [333] inactive objects, 291004416 [93614080] bytes
> 0 unbound objects, 0 bytes
> 199 purgeable objects, 92844032 bytes
> 30 pinned mappable objects, 18989056 bytes
> 139 fault mappable objects, 17371136 bytes
> 2145386496 [268435456] gtt total
> 
> Xorg: 632 objects, 235450368 bytes (0 active, 180899840 inactive, 21262336 unbound)
> gnome-control-c: 11 objects, 110592 bytes (0 active, 0 inactive, 49152 unbound)
> chromium-browse: 266 objects, 101367808 bytes (0 active, 101330944 inactive, 0 unbound)
> Xorg: 0 objects, 0 bytes (0 active, 0 inactive, 0 unbound)

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