Since we can only swap out shmemfs objects, those are the only ones that
influence the ability of the shrinker to can free pages. Currently, all
non-shmemfs objects have a raised pages_pin_count to protect them from
the shrinker, so this just makes the logic for can_release_pages()
clearer (and safer in future so that we don't over estimate our ability
to free up pages from future non-swappable objects).
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_shrinker.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c
index cb225e039d48..e44c6358bd5a 100644
--- a/drivers/gpu/drm/i915/i915_gem_shrinker.c
+++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c
@@ -70,6 +70,10 @@ static bool swap_available(void)
static bool can_release_pages(struct drm_i915_gem_object *obj)
{
+ /* Only shmemfs objects are backed by swapped */
+ if (!obj->base.filp)
+ return false;
+
/* Only report true if by unbinding the object and putting its pages
* we can actually make forward progress towards freeing physical
* pages.
@@ -349,18 +353,12 @@ i915_gem_shrinker_oom(struct notifier_block *nb, unsigned long event, void *ptr)
*/
unbound = bound = unevictable = 0;
list_for_each_entry(obj, &dev_priv->mm.unbound_list, global_list) {
- if (!obj->base.filp) /* not backed by a freeable object */
- continue;
-
if (!can_release_pages(obj))
unevictable += obj->base.size >> PAGE_SHIFT;
else
unbound += obj->base.size >> PAGE_SHIFT;
}
list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
- if (!obj->base.filp)
- continue;
-
if (!can_release_pages(obj))
unevictable += obj->base.size >> PAGE_SHIFT;
else
--
2.8.1
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