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drm/i915: Limit ring synchronisation (sw sempahores) RPS boosts

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Ring switches can occur many times per frame, and are often out of
control, causing frequent RPS boosting for no practical benefit. Treat
the sw semaphore synchronisation as a separate client and only allow it
to boost once per busy/idle cycle.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: s/rq/req/]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson
2015-04-27 13:41:20 +01:00
committed by Daniel Vetter
parent 03ade51185
commit a6f766f397
4 changed files with 25 additions and 18 deletions
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1
drivers/gpu/drm/i915/i915_debugfs.c
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@@ -2311,6 +2311,7 @@ static int i915_rps_boost_info(struct seq_file *m, void *data)
list_empty(&file_priv->rps_boost) ? "" : ", active");
rcu_read_unlock();
}
seq_printf(m, "Semaphore boosts: %d\n", dev_priv->rps.semaphores.rps_boosts);
seq_printf(m, "Kernel boosts: %d\n", dev_priv->rps.boosts);
mutex_unlock(&dev_priv->rps.hw_lock);