From 1d24ad457c54f0c8a835c33b7f687c454b643fcb Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 1 Jun 2017 14:33:29 +0100 Subject: [PATCH] drm/i915: Allow kswapd to pause the device whilst reaping In commit 5763ff04dc4e ("drm/i915: Avoid GPU stalls from kswapd") we stopped direct reclaim and kswapd from triggering GPU/client stalls whilst running (by restricting the objects they could reap to be idle). However with abusive GPU usage, it becomes quite easy to starve kswapd of memory and prevent it from making forward progress towards obtaining enough free memory (thus driving the system closer to swap exhaustion). Relax the previous restriction to allow kswapd (but not direct reclaim) to stall the device whilst reaping purgeable pages. v2: Also acquire the rpm wakelock to allow kswapd to unbind buffers. Signed-off-by: Chris Wilson Cc: Joonas Lahtinen Link: http://patchwork.freedesktop.org/patch/msgid/20170601133331.5973-1-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen Reviewed-by: Mika Kuoppala --- drivers/gpu/drm/i915/i915_gem_shrinker.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c index 0fd2b58..58f27369 100644 --- a/drivers/gpu/drm/i915/i915_gem_shrinker.c +++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c @@ -332,6 +332,15 @@ i915_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) sc->nr_to_scan - freed, I915_SHRINK_BOUND | I915_SHRINK_UNBOUND); + if (freed < sc->nr_to_scan && current_is_kswapd()) { + intel_runtime_pm_get(dev_priv); + freed += i915_gem_shrink(dev_priv, + sc->nr_to_scan - freed, + I915_SHRINK_ACTIVE | + I915_SHRINK_BOUND | + I915_SHRINK_UNBOUND); + intel_runtime_pm_put(dev_priv); + } shrinker_unlock(dev_priv, unlock); -- 2.7.4