[Qemu-devel] [PATCH 10/10] XBZRLE: update the doc of XBZRLE

[arei.gonglei]

From: ChenLiang <address@hidden>

Signed-off-by: ChenLiang <address@hidden>
Signed-off-by: Gonglei <address@hidden>
---
 docs/xbzrle.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/docs/xbzrle.txt b/docs/xbzrle.txt
index cc3a26a..cdf1e3e 100644
--- a/docs/xbzrle.txt
+++ b/docs/xbzrle.txt
@@ -71,6 +71,13 @@ encoded buffer:
 encoded length 24
 e9 07 0f 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 03 01 67 01 01 69
 
+The strategy of updating cache
+=================================
+Keeping the hot page in cache is effective to decrease cache missing.
+XBZRLE use a counter as the age of page. The counter will increase
+after the ram dirty bitmap syncing. When cache conflicts XBZRLE only
+replace the old page in cache.
+
 Usage
 ======================
 1. Verify the destination QEMU version is able to decode the new format.
-- 
1.7.12.4