drm/i915: Convert non-blocking userptr waits for requests over to using RCU

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We can completely avoid taking the struct_mutex around the non-blocking
waits by switching over to the RCU request management (trading the mutex
for a RCU read lock and some complex atomic operations). The improvement
is that we gain further contention reduction, and overall the code
become simpler due to the reduced mutex dancing.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1470388464-28458-3-git-send-email-chris@chris-wilson.co.uk

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Chris Wilson 2016-08-05 10:14:08 +01:00

parent b8f9096d6a

commit 8a3b3d576c

1 changed files with 7 additions and 27 deletions

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34

drivers/gpu/drm/i915/i915_gem_userptr.c

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