From 99015f3a985b2fd051606636743a2a2969b216e8 Mon Sep 17 00:00:00 2001
From: Mole Shang <135e2@135e2.dev>
Date: Fri, 16 Feb 2024 10:05:03 +0800
Subject: lab lock/bcache: finish

---
 kernel/buf.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'kernel/buf.h')

diff --git a/kernel/buf.h b/kernel/buf.h
index 4616e9e..bbef407 100644
--- a/kernel/buf.h
+++ b/kernel/buf.h
@@ -8,5 +8,6 @@ struct buf {
   struct buf *prev; // LRU cache list
   struct buf *next;
   uchar data[BSIZE];
+  uint ticks;  // derived from global variable ticks (trap.c), record ticks when last modified
 };
 
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