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drm/i915: Wait for the GPU whilst shrinking, if truly desperate.

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By idling the GPU and discarding everything we can when under extreme
memory pressure, the number of OOM-killer events is dramatically
reduced. For instance, this makes it possible to run
firefox-planet-gnome.trace again on my swapless 512MiB i915.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Chris Wilson 2010-04-20 17:10:35 +01:00 committed by Eric Anholt
parent 0a31a44865
commit 1637ef413b
1 changed files with 45 additions and 0 deletions
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45
drivers/gpu/drm/i915/i915_gem.c
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@ -5065,6 +5065,20 @@ void i915_gem_release(struct drm_device * dev, struct drm_file *file_priv)
mutex_unlock(&dev->struct_mutex);
}
static int
i915_gpu_is_active(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
int lists_empty;
spin_lock(&dev_priv->mm.active_list_lock);
lists_empty = list_empty(&dev_priv->mm.flushing_list) &&
list_empty(&dev_priv->mm.active_list);
spin_unlock(&dev_priv->mm.active_list_lock);
return !lists_empty;
}
static int
i915_gem_shrink(int nr_to_scan, gfp_t gfp_mask)
{
@ -5094,6 +5108,7 @@ i915_gem_shrink(int nr_to_scan, gfp_t gfp_mask)
spin_lock(&shrink_list_lock);
rescan:
/* first scan for clean buffers */
list_for_each_entry_safe(dev_priv, next_dev,
&shrink_list, mm.shrink_list) {
@ -5151,6 +5166,36 @@ i915_gem_shrink(int nr_to_scan, gfp_t gfp_mask)
would_deadlock = 0;
}
if (nr_to_scan) {
int active = 0;
/*
* We are desperate for pages, so as a last resort, wait
* for the GPU to finish and discard whatever we can.
* This has a dramatic impact to reduce the number of
* OOM-killer events whilst running the GPU aggressively.
*/
list_for_each_entry(dev_priv, &shrink_list, mm.shrink_list) {
struct drm_device *dev = dev_priv->dev;
if (!mutex_trylock(&dev->struct_mutex))
continue;
spin_unlock(&shrink_list_lock);
if (i915_gpu_is_active(dev)) {
i915_gpu_idle(dev);
active++;
}
spin_lock(&shrink_list_lock);
mutex_unlock(&dev->struct_mutex);
}
if (active)
goto rescan;
}
spin_unlock(&shrink_list_lock);
if (would_deadlock)