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drm/i915: Truncate the shmem backing pages on purge

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shmfs doesn't actually implement i_ops->truncate() so we were not
immedatiately releasing the backing pages when shrinking the gfx cache
under OOM. Instead use a combination of truncate_inode_pages() and
i_ops->truncate_range() as is used by shmem_delete_inode().

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 2010-08-07 11:01:30 +01:00 committed by Eric Anholt
parent 20a0945951
commit ae9fed6b60
1 changed files with 9 additions and 2 deletions
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11
drivers/gpu/drm/i915/i915_gem.c
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@ -1505,9 +1505,16 @@ i915_gem_object_truncate(struct drm_gem_object *obj)
struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
struct inode *inode;
/* Our goal here is to return as much of the memory as
* is possible back to the system as we are called from OOM.
* To do this we must instruct the shmfs to drop all of its
* backing pages, *now*. Here we mirror the actions taken
* when by shmem_delete_inode() to release the backing store.
*/
inode = obj->filp->f_path.dentry->d_inode;
if (inode->i_op->truncate)
inode->i_op->truncate (inode);
truncate_inode_pages(inode->i_mapping, 0);
if (inode->i_op->truncate_range)
inode->i_op->truncate_range(inode, 0, (loff_t)-1);
obj_priv->madv = __I915_MADV_PURGED;
}