From 9f527308d7248d1ec1d63f0911757bb5faa7ea10 Mon Sep 17 00:00:00 2001
From: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date: Tue, 12 Jun 2012 09:46:09 +0200
Subject: libblock: Add block device statistics

---
 cpukit/libblock/include/rtems/diskdevs.h | 67 ++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)

(limited to 'cpukit/libblock/include/rtems/diskdevs.h')

diff --git a/cpukit/libblock/include/rtems/diskdevs.h b/cpukit/libblock/include/rtems/diskdevs.h
index 6e6be5e9b7..3a9967ecb2 100644
--- a/cpukit/libblock/include/rtems/diskdevs.h
+++ b/cpukit/libblock/include/rtems/diskdevs.h
@@ -86,6 +86,68 @@ typedef struct {
   rtems_blkdev_bnum next;
 } rtems_blkdev_read_ahead;
 
+/**
+ * @brief Block device statistics.
+ *
+ * Integer overflows in the statistic counters may happen.
+ */
+typedef struct {
+  /**
+   * @brief Read hit count.
+   * 
+   * A read hit occurs in the rtems_bdbuf_read() function in case the block is
+   * in the cached or modified state.
+   */
+  uint32_t read_hits;
+
+  /**
+   * @brief Read miss count.
+   * 
+   * A read miss occurs in the rtems_bdbuf_read() function in case the block is
+   * in the empty state and a read transfer must be initiated to read the data
+   * from the device.
+   */
+  uint32_t read_misses;
+
+  /**
+   * @brief Read-ahead transfer count.
+   *
+   * Each read-ahead transfer may read multiple blocks.
+   */
+  uint32_t read_ahead_transfers;
+
+  /**
+   * @brief Count of blocks transfered from the device.
+   */
+  uint32_t read_blocks;
+
+  /**
+   * @brief Read error count.
+   *
+   * Error count of transfers issued by the read or read-ahead requests.
+   */
+  uint32_t read_errors;
+
+  /**
+   * @brief Write transfer count.
+   *
+   * Each write transfer may write multiple blocks.
+   */
+  uint32_t write_transfers;
+
+  /**
+   * @brief Count of blocks transfered to the device.
+   */
+  uint32_t write_blocks;
+
+  /**
+   * @brief Write error count.
+   *
+   * Error count of transfers issued by write requests.
+   */
+  uint32_t write_errors;
+} rtems_blkdev_stats;
+
 /**
  * @brief Description of a disk device (logical and physical disks).
  *
@@ -201,6 +263,11 @@ struct rtems_disk_device {
    */
   bool deleted;
 
+  /**
+   * @brief Device statistics for this disk.
+   */
+  rtems_blkdev_stats stats;
+
   /**
    * @brief Read-ahead control for this disk.
    */
-- 
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