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bufferpool: avoid excessive GstPoll activity

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Keep an extra write ref on the control socket. This ensures that we
avoid a read/write on the socket when going from non-empty->empty->not-empty.
We remove the write ref only when we actually are empty and we need to
wait for flushing or a new buffer.

This makes the bufferpool benchmark about 30% faster than the pure
malloc implementation.
This commit is contained in:
Wim Taymans 2014-01-30 12:26:05 +01:00
parent fb44b4d2ec
commit 878621f6f5
1 changed files with 8 additions and 2 deletions
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10
gst/gstbufferpool.c
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@ -178,6 +178,9 @@ gst_buffer_pool_init (GstBufferPool * pool)
gst_allocation_params_init (&priv->params);
gst_buffer_pool_config_set_allocator (priv->config, priv->allocator,
&priv->params);
/* 1 control write for flushing */
gst_poll_write_control (priv->poll);
/* 1 control write for marking that we are not waiting for poll */
gst_poll_write_control (priv->poll);
GST_DEBUG_OBJECT (pool, "created");
@ -1007,9 +1010,12 @@ default_acquire_buffer (GstBufferPool * pool, GstBuffer ** buffer,
break;
}
/* now wait */
GST_LOG_OBJECT (pool, "waiting for free buffers");
/* now we release the control socket, we wait for a buffer release or
* flushing */
gst_poll_read_control (pool->priv->poll);
GST_LOG_OBJECT (pool, "waiting for free buffers or flushing");
gst_poll_wait (priv->poll, GST_CLOCK_TIME_NONE);
gst_poll_write_control (pool->priv->poll);
}
return result;