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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-03-25 19:47:34 +0200 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-03-27 13:27:03 +0200 |
| commit | 692a576b9ddf8006f1559e14a5022c0a100440f1 (patch) | |
| tree | 61b63ce355ddbc87d26129bc58a08d9873957b6e /tools/perf/scripts/python/check-perf-trace.py | |
| parent | 3ae5378330f581466b05bcea2dd3bc8731a598cb (diff) | |
drm/i915: don't call shmem_read_mapping unnecessarily
This speeds up pwrite and pread from ~120 µs ro ~100 µs for
reading/writing 1mb on my snb (if the backing storage pages
are already pinned, of course).
v2: Chris Wilson pointed out a glaring page reference bug - I've
unconditionally dropped the reference. With that fixed (and the
associated reduction of dirt in dmesg) it's now even a notch faster.
v3: Unconditionaly grab a page reference when dropping
dev->struct_mutex to simplify the code-flow.
Tested-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'tools/perf/scripts/python/check-perf-trace.py')
0 files changed, 0 insertions, 0 deletions