ã«ã¼ãã«2.6ã¯ã¹ã±ã¼ã©ããªãã£ã®åä¸ã大ããªç®æ¨ã¨ãã¦ãã«ã¼ãã«ã®å é¨ä»æ§ã«å¤§å¹ ãã¤æ欲çãªå¤æ´ãå ãããã¦ãããã¾ããJFSãXFSã¨ãã£ããã¡ã¤ã«ã·ã¹ãã ã®è¿½å ãUSAGIãUMLï¼User Mode Linuxï¼ã®çµ±åãæ°ããã¤ã¹ã®ãµãã¼ããªã©ãè¡ãããã 第1ç« ã¨ãªãä»åã¯ãã«ã¼ãã«2.6ã®æ大ã®ç®æ¨ã§ããã¹ã±ã¼ã©ããªãã£ã®å¼·åã«æ³¨ç®ãã¦ã主ã«å é¨ä»æ§ã解説ããã次å以éã§ã¯ã主ã«ã¦ã¼ã¶ã¼ããè¦ãã«ã¼ãã«ã®æ°æ©è½ã«ã¤ãã¦ç´¹ä»ããäºå®ã ã ãã«ãããã»ããµã·ã¹ãã 対å¿ã®å¼·å â RCUï¼Read-Copy Updateï¼ ã«ã¼ãã«2.6ã§ã¯ãRCUï¼Read-Copy Updateï¼ã¨å¼ã°ããæ°ããåææ©æ§ã追å ãããã ã«ã¼ãã«ã«ã¯ãè¤æ°ã®ããã»ããµããã®åæã¢ã¯ã»ã¹ãããã¼ã¿æ§é ãä¿è·ãããããã¹ãã³ããã¯ãã¯ããã¨ããåææ©æ§ãç¨æããã¦ãããããããå¾æ¥ã®åææ©æ§ã§ã¯ããã¯ï¼
ãªã¼ãã»ã³ãã¼ã»ã¢ãããã¼ãï¼read-copy-updateãRCUã¨ç¥è¨ï¼ã¨ã¯ããªãã¬ã¼ãã£ã³ã°ã·ã¹ãã ã«ããã¦ä¸ç¨®ã®æä»å¶å¾¡[note 1]ãå®è£ ããåææ©æ§ã§ããããªã¼ãã¼ã»ã©ã¤ã¿ã¼ããã¯ï¼è±èªçï¼ã®ä»£æ¿æ段ã¨ãã¦ä½¿ããããã¨ããããåç §ã«ããã¦å¾ ã¡ç¶æ ãçããã極ãã¦ãªã¼ãã¼ããããä½ãããããRCUã«ããããã¼ã¿æ´æ°ã¯ãæ¢åã®åç §è ã®ããã«å¤ãçã®ãã¼ã¿æ§é ãä¿æãã¤ã¤è¡ããããæéã¨ç©ºéï¼ã¡ã¢ãªï¼ãããå¤ãå¿ è¦ã¨ãããå¤ãçã®ãã¼ã¿æ§é ã¯ãæ¢åã®åç §è ãå ¨ã¦ã¢ã¯ã»ã¹ãå®äºããå¾ã§ååãããã RCUã§ã¯ãåç §å´ã¯ãªãã£ã«ã«ã»ã¯ã·ã§ã³ãã¨ããæ¦å¿µããããé常 rcu_read_lock() 㨠rcu_read_unlock() ã§æã¾ããé¨åãããã«ããããåç §å´ã¯ãªãã£ã«ã«ã»ã¯ã·ã§ã³å ã«ãªãæã¯ãä¸æ´»æ§ç¶æ ãã¨å¼ã°ããRCUã§ä¿è·ããããã¼ã¿æ§é ã¸ã®åç §ãä¿æãããã¨ã¯è¨±ã
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