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authorChris Wilson <chris@chris-wilson.co.uk>2018-07-03 11:18:29 +0100
committerChris Wilson <chris@chris-wilson.co.uk>2018-07-03 22:02:36 +0100
commit38b7fb0b2ad1f2ba83bf9a8535cedb198a448ea4 (patch)
tree2b92a2acee20be37a3c03a64836ce00b17be37df /Documentation/SubmittingPatches
parenta608987970b929e250957e4e3fb891f1f10eff6f (diff)
drm/i915/selftests: Release the struct_mutex to free the objects
live_gtt is a very slow test to run, simply because it tries to allocate and use as much as the 48b address space as possibly can and in the process will try to own all of the system memory. This leads to resource exhaustion and CPU starvation; the latter impacts us when the NMI watchdog declares a task hung due to a mutex contention with ourselves. This we can prevent by releasing the struct_mutex and forcing our i915/rcu workers to run, and in particular flushing the freed object worker that is the cause for concern. References: https://bugs.freedesktop.org/show_bug.cgi?id=107094 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180703101829.7360-1-chris@chris-wilson.co.uk
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