drm/i915: Wire up shrinkctl->nr_scanned
authorChris Wilson <chris@chris-wilson.co.uk>
Fri, 13 Oct 2017 20:26:18 +0000 (21:26 +0100)
committerChris Wilson <chris@chris-wilson.co.uk>
Mon, 16 Oct 2017 19:44:19 +0000 (20:44 +0100)
commit4e773c3a8a693e5abc248c5be26973b868466dde
tree61ca3c2295d12f60cbe3bad9454746bf1b21b819
parentf2123818ffad0332e03c266ca73fe116e8ea5354
drm/i915: Wire up shrinkctl->nr_scanned

shrink_slab() allows us to report back the number of objects we
successfully scanned (out of the target shrinkctl->nr_to_scan). As
report the number of pages owned by each GEM object as a separate item
to the shrinker, we cannot precisely control the number of shrinker
objects we scan on each pass; and indeed may free more than requested.
If we fail to tell the shrinker about the number of objects we process,
it will continue to hold a grudge against us as any objects left
unscanned are added to the next reclaim -- and so we will keep on
"unfairly" shrinking our own slab in comparison to other slabs.

v2: fixup the misplaced addition, we want to count everything we scan
(to match the number we reported earlier) not just the objects we
successfully validated and freed.

References: 912d572d63b8 ("drm/i915: wire up shrinkctl->nr_scanned")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171013202621.7276-6-chris@chris-wilson.co.uk
drivers/gpu/drm/i915/i915_gem_shrinker.c