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drm/i915: Do not mis-classify clean objects as purgeable

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Whilst cleaning up the patches for submission, I mis-classified non-dirty
objects as purgeable. This was causing the backing pages for those
objects to be evicted under memory-pressure, discarding valid and
unreplaceable texture data.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2009-09-20 23:03:54 +01:00
parent 13a05fd978
commit 963b483691
1 changed files with 26 additions and 29 deletions
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55
drivers/gpu/drm/i915/i915_gem.c
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@ -1530,6 +1530,23 @@ i915_gem_object_move_to_flushing(struct drm_gem_object *obj)
obj_priv->last_rendering_seqno = 0; obj_priv->last_rendering_seqno = 0;
} }
/* Immediately discard the backing storage */
static void
i915_gem_object_truncate(struct drm_gem_object *obj)
{
struct inode *inode;
inode = obj->filp->f_path.dentry->d_inode;
if (inode->i_op->truncate)
inode->i_op->truncate (inode);
}
static inline int
i915_gem_object_is_purgeable(struct drm_i915_gem_object *obj_priv)
{
return obj_priv->madv == I915_MADV_DONTNEED;
}
static void static void
i915_gem_object_move_to_inactive(struct drm_gem_object *obj) i915_gem_object_move_to_inactive(struct drm_gem_object *obj)
{ {
@ -2018,17 +2035,14 @@ i915_gem_object_unbind(struct drm_gem_object *obj)
if (!list_empty(&obj_priv->list)) if (!list_empty(&obj_priv->list))
list_del_init(&obj_priv->list); list_del_init(&obj_priv->list);
if (i915_gem_object_is_purgeable(obj_priv))
i915_gem_object_truncate(obj);
trace_i915_gem_object_unbind(obj); trace_i915_gem_object_unbind(obj);
return 0; return 0;
} }
static inline int
i915_gem_object_is_purgeable(struct drm_i915_gem_object *obj_priv)
{
return !obj_priv->dirty || obj_priv->madv == I915_MADV_DONTNEED;
}
static struct drm_gem_object * static struct drm_gem_object *
i915_gem_find_inactive_object(struct drm_device *dev, int min_size) i915_gem_find_inactive_object(struct drm_device *dev, int min_size)
{ {
@ -2041,7 +2055,8 @@ i915_gem_find_inactive_object(struct drm_device *dev, int min_size)
list_for_each_entry(obj_priv, &dev_priv->mm.inactive_list, list) { list_for_each_entry(obj_priv, &dev_priv->mm.inactive_list, list) {
struct drm_gem_object *obj = obj_priv->obj; struct drm_gem_object *obj = obj_priv->obj;
if (obj->size >= min_size) { if (obj->size >= min_size) {
if (i915_gem_object_is_purgeable(obj_priv) && if ((!obj_priv->dirty ||
i915_gem_object_is_purgeable(obj_priv)) &&
(!best || obj->size < best->size)) { (!best || obj->size < best->size)) {
best = obj; best = obj;
if (best->size == min_size) if (best->size == min_size)
@ -4808,19 +4823,6 @@ void i915_gem_release(struct drm_device * dev, struct drm_file *file_priv)
mutex_unlock(&dev->struct_mutex); mutex_unlock(&dev->struct_mutex);
} }
/* Immediately discard the backing storage */
static void
i915_gem_object_truncate(struct drm_gem_object *obj)
{
struct inode *inode;
inode = obj->filp->f_path.dentry->d_inode;
mutex_lock(&inode->i_mutex);
truncate_inode_pages(inode->i_mapping, 0);
mutex_unlock(&inode->i_mutex);
}
static int static int
i915_gem_shrink(int nr_to_scan, gfp_t gfp_mask) i915_gem_shrink(int nr_to_scan, gfp_t gfp_mask)
{ {
@ -4866,10 +4868,7 @@ i915_gem_shrink(int nr_to_scan, gfp_t gfp_mask)
&dev_priv->mm.inactive_list, &dev_priv->mm.inactive_list,
list) { list) {
if (i915_gem_object_is_purgeable(obj_priv)) { if (i915_gem_object_is_purgeable(obj_priv)) {
struct drm_gem_object *obj = obj_priv->obj; i915_gem_object_unbind(obj_priv->obj);
i915_gem_object_unbind(obj);
i915_gem_object_truncate(obj);
if (--nr_to_scan <= 0) if (--nr_to_scan <= 0)
break; break;
} }
@ -4878,6 +4877,8 @@ i915_gem_shrink(int nr_to_scan, gfp_t gfp_mask)
spin_lock(&shrink_list_lock); spin_lock(&shrink_list_lock);
mutex_unlock(&dev->struct_mutex); mutex_unlock(&dev->struct_mutex);
would_deadlock = 0;
if (nr_to_scan <= 0) if (nr_to_scan <= 0)
break; break;
} }
@ -4896,11 +4897,7 @@ i915_gem_shrink(int nr_to_scan, gfp_t gfp_mask)
&dev_priv->mm.inactive_list, &dev_priv->mm.inactive_list,
list) { list) {
if (nr_to_scan > 0) { if (nr_to_scan > 0) {
struct drm_gem_object *obj = obj_priv->obj; i915_gem_object_unbind(obj_priv->obj);
i915_gem_object_unbind(obj);
if (i915_gem_object_is_purgeable(obj_priv))
i915_gem_object_truncate(obj);
nr_to_scan--; nr_to_scan--;
} else } else
cnt++; cnt++;