From c488c7f649106d09df76f697adccbe6e72520b26 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Thu, 25 Aug 2011 08:26:10 +0200
Subject: block: latency accounting

Account the total latency for read/write/flush requests.  This allows
management tools to average it based on a snapshot of the nr ops
counters and allow checking for SLAs or provide statistics.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'block.h')

diff --git a/block.h b/block.h
index df06af5982..3ac0b944eb 100644
--- a/block.h
+++ b/block.h
@@ -264,6 +264,7 @@ enum BlockAcctType {
 
 typedef struct BlockAcctCookie {
     int64_t bytes;
+    int64_t start_time_ns;
     enum BlockAcctType type;
 } BlockAcctCookie;
 
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