[PATCH 03/21] drm/i915: Only attempt to scan the requested number of shrinker slabs

Chris Wilson chris at chris-wilson.co.uk
Wed Jan 17 14:25:01 UTC 2018

Since commit 4e773c3a8a69 ("drm/i915: Wire up shrinkctl->nr_scanned"),
we track the number of objects we scan and do not wish to exceed that as
it will overly penalise our own slabs under mempressure. Given that we
now know the target number of objects to scan, use that as our guide for
deciding to shrink as opposed to the number of objects we manage to
shrink (which doesn't correspond to the numbers we report to shrinkctl).

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
 drivers/gpu/drm/i915/i915_gem_shrinker.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c
index 9029ed04879c..0e158f9287c4 100644
--- a/drivers/gpu/drm/i915/i915_gem_shrinker.c
+++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c
@@ -363,13 +363,13 @@ i915_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
 				I915_SHRINK_BOUND |
-	if (freed < sc->nr_to_scan)
+	if (sc->nr_scanned < sc->nr_to_scan)
 		freed += i915_gem_shrink(i915,
 					 sc->nr_to_scan - sc->nr_scanned,
 					 I915_SHRINK_BOUND |
-	if (freed < sc->nr_to_scan && current_is_kswapd()) {
+	if (sc->nr_scanned < sc->nr_to_scan && current_is_kswapd()) {
 		freed += i915_gem_shrink(i915,
 					 sc->nr_to_scan - sc->nr_scanned,

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