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drm/i915: Align the retire_requests worker to the nearest second 

By using round_jiffies() we can align the wakeup of our worker to the
nearest second in order to batch wakeups and reduce system load, which
is useful for unimportant coarse tasks like our retire_requests.

v2: round_jiffies_relative() already returns the relative timeout value,
so no need to incorrectly perform the subtraction twice. The timer
interface still leaves the possibility for the value of jiffies to
change be we program the timer.

Suggested-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-10-05 17:02:57 +01:00 committed by Daniel Vetter
parent cecc21fea9
commit bcb4508616
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/gpu/drm/i915/i915_gem.c
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@ -2019,7 +2019,8 @@ i915_add_request(struct intel_ring_buffer *ring,
} }
if (was_empty) { if (was_empty) {
queue_delayed_work(dev_priv->wq, queue_delayed_work(dev_priv->wq,
&dev_priv->mm.retire_work, HZ); &dev_priv->mm.retire_work,
round_jiffies_up_relative(HZ));
intel_mark_busy(dev_priv->dev); intel_mark_busy(dev_priv->dev);
} }
} }
@ -2208,7 +2209,8 @@ i915_gem_retire_work_handler(struct work_struct *work)
/* Come back later if the device is busy... */ /* Come back later if the device is busy... */
if (!mutex_trylock(&dev->struct_mutex)) { if (!mutex_trylock(&dev->struct_mutex)) {
queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, HZ); queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work,
round_jiffies_up_relative(HZ));
return; return;
} }
@ -2226,7 +2228,8 @@ i915_gem_retire_work_handler(struct work_struct *work)
} }
if (!dev_priv->mm.suspended && !idle) if (!dev_priv->mm.suspended && !idle)
queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, HZ); queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work,
round_jiffies_up_relative(HZ));
if (idle) if (idle)
intel_mark_idle(dev); intel_mark_idle(dev);