tree 167ec5514586d474a34f9fa4185fcc56a4034ae1
parent 8742267af4043606869f5b8dadbef635405543c3
author Chris Wilson <chris@chris-wilson.co.uk> 1353503044 +0000
committer Daniel Vetter <daniel.vetter@ffwll.ch> 1353516434 +0100

drm/i915: Borrow our struct_mutex for the direct reclaim

If we have hit oom whilst holding our struct_mutex, then currently we
cannot reap our own GPU buffers which likely pin most of memory, making
an outright OOM more likely. So if we are running in direct reclaim and
already hold the mutex, attempt to free buffers knowing that the
original function can not continue until we return.

v2: Add a note explaining that the mutex may be stolen due to
pre-emption, and that is bad.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>