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drm/i915: Release the mmap offset when purging a buffer 

If we discard a buffer due to memory pressure, also release its alloted
mmap address space. As it may be sometime before userspace wakes up
and notices that it has buffers to purge from its cache, we may waste
valuable address space on unusable objects for a period of time.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=47738
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-02-24 21:13:38 +00:00 committed by Daniel Vetter
parent 121d527a32
commit a14917eeb2
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/i915_gem.c
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@ -1546,6 +1546,9 @@ i915_gem_object_truncate(struct drm_i915_gem_object *obj)
inode = obj->base.filp->f_path.dentry->d_inode;
shmem_truncate_range(inode, 0, (loff_t)-1);
if (obj->base.map_list.map)
drm_gem_free_mmap_offset(&obj->base);
obj->madv = __I915_MADV_PURGED;
}