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| author |   Chris Wilson <chris@chris-wilson.co.uk> | 2016-08-05 10:14:07 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2016-08-05 10:54:34 +0100 |
| commit | b8f9096d6a51e3ac31deb0f57a9a323059bb4281 (patch) | |
| tree | 87f367f7edfb4dc91ef6277fec2d94cbadd65595 /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | drm/i915: Introduce i915_gem_active_wait_unlocked() (diff) | |
| download | linux-dev-b8f9096d6a51e3ac31deb0f57a9a323059bb4281.tar.xz linux-dev-b8f9096d6a51e3ac31deb0f57a9a323059bb4281.zip | |
drm/i915: Convert non-blocking waits for requests over to using RCU
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.
v2: Move i915_gem_fault tracepoint back to the start of the function,
before the unlocked wait.
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/1470388464-28458-2-git-send-email-chris@chris-wilson.co.uk
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